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Urabe Y, Oka S, Ishikawa H, Nakajima T, Tanakaya K, Takayama T, Ishida H, Tanaka S. Lynch Syndrome Screening and Surveillance Trends among Gastroenterologists in Japan: A Questionnaire Survey-based Analysis. Intern Med 2025; 64:1459-1469. [PMID: 39462590 DOI: 10.2169/internalmedicine.4471-24] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/29/2024] Open
Abstract
Objective Screening and surveillance methodologies for Lynch syndrome (LS) in Japan. This study assessed the changes in LS knowledge and practice trends. Methods In 2020 and 2022, 2 questionnaire surveys were administered to 3,574 councilors of the Japanese Society of Gastroenterology to assess changes in LS-related knowledge and practices. Materials Each questionnaire item was analyzed by comparing responses between the first and second surveys to determine the proportion of doctors selecting each option relative to the total number of respondents. The responses from doctors who completed both surveys were analyzed to assess the temporal changes in their responses. Results The second survey showed a significant increase in the awareness of universal tumor screening (UTS), proportion of doctors selecting UTS for primary LS screening, use of BRAF V600E testing for chemotherapy selection, and number of newly diagnosed LS patients per doctor over the last three years. In addition, the number of patients currently under surveillance by doctors has also increased. Doctors who intensified primary screening for LS between surveys reported a greater increase in newly diagnosed cases. However, the rise in UTS suggests a potential bias from doctors with heightened interest in LS, which may have influenced the findings. Conclusion The number of newly diagnosed and currently monitored patients with LS in Japan has been increasing, likely due to expanded screening practices. However, the potential bias introduced by the increased adoption of UTS should be considered when interpreting these results.
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Affiliation(s)
- Yuji Urabe
- Department of Gastroenterology, Hiroshima University Hospital, Japan
| | - Shiro Oka
- Department of Gastroenterology, Hiroshima University Hospital, Japan
| | - Hideki Ishikawa
- Department of Molecular-Targeting Prevention, Kyoto Prefectural University of Medicine, Japan
| | - Takeshi Nakajima
- Medical Ethics and Medical Genetics, School of Public Health, Kyoto University, Japan
| | - Kohji Tanakaya
- Department of Surgery, National Hospital Organization Iwakuni Clinical Center, Japan
| | - Tetsuji Takayama
- Department of Gastroenterology and Oncology, Tokushima University Graduate School of Biomedical Science, Japan
| | - Hideyuki Ishida
- Department of Digestive Tract and General Surgery, Saitama Medical Center, Saitama Medical University, Japan
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Aronson M, Palma L, Semotiuk K, Nuk J, Pollett A, Singh H, Rothenmund H, Racher H, Jessen J, Pautler SE, Rusnak A, Rutka M, Etchegary H, Tiano T, Kaurah P, Dawson L, Hawrysh A, Ward T, Bedard A, Sheffield BS, Lerner-Ellis J, Jacob K, Ferguson S, Kim CA, Chamberlain E, Dornan K, Waldman L, Holter S, Horte J, Hyde A, Kwon J, MacMillan A, O'Loughlin M, Tabori U, Gallinger S, Kim R. Canadian consensus for the assessment and testing of Lynch syndrome. J Med Genet 2025; 62:326-334. [PMID: 40081873 PMCID: PMC12015070 DOI: 10.1136/jmg-2024-110465] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2024] [Accepted: 01/11/2025] [Indexed: 03/16/2025]
Abstract
BACKGROUND Lynch syndrome (LS) is an autosomal dominant cancer predisposition syndrome caused by a germline pathogenic variant, or epigenetic silencing, of a mismatch repair (MMR) gene, leading to a wide cancer spectrum with gene-specific penetrance. Ascertainment, assessment and testing of LS individuals is complex. A Canadian national guideline is needed to ensure equitable access to patient care across the country. METHODS The Canadian Lynch Syndrome (CDN-LS) working group was formed in 2021, consisting of 37 multidisciplinary LS experts and patient partners. To formulate consensus statements, a national environmental scan, Canadian clinical survey and literature review were undertaken. The e-Delphi method was used to reach consensus statements among the CDN-LS group. RESULTS The CDN-LS group voted on 21 statements, and 18 statements were adopted with over 80% agreement, including 16 statements that had over 90% agreement. These statements provide comprehensive guidelines on universal MMR reflex testing, cascade tumour testing (MLH1 promoter methylation, BRAF, somatic MMR), germline testing, therapeutics and patient advocacy. CONCLUSION This is the first comprehensive Canadian guideline for LS providing guidance to genetic specialists, laboratories, primary care providers and healthcare providers caring for patients with LS. It is endorsed by the Canadian College of Medical Genetics and the Canadian Association of Genetic Counsellors. The consensus statements are presented as a model for standard of care that improves equitable access to health services for LS across the country. Future work should include a national consensus on LS surveillance, with a goal to harmonise LS care across all provincial and territorial healthcare authorities.
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Affiliation(s)
- Melyssa Aronson
- Zane Cohen Centre for Digestive Diseases, Sinai Health System, Toronto, Ontario, Canada
- University of Toronto, Toronto, Ontario, Canada
| | - Laura Palma
- Specialized Medicine, Division of Medical Genetics and Department of Human Genetics, McGill University, Montreal, Québec, Canada
| | - Kara Semotiuk
- Zane Cohen Centre for Digestive Diseases, Sinai Health System, Toronto, Ontario, Canada
- Department of Molecular Genetics, University of Toronto, Toronto, Ontario, Canada
| | - Jennifer Nuk
- Hereditary Cancer Program, BC Cancer Agency, Victoria, British Columbia, Canada
- Department of Medical Genetics, The University of British Columbia, Vancouver, British Columbia, Canada
| | - Aaron Pollett
- University of Toronto, Toronto, Ontario, Canada
- Pathology and Laboratory Medicine, Sinai Health System, Toronto, Ontario, Canada
| | - Harminder Singh
- Rady Faculty of Health Sciences, Department of Internal Medicine, Max Rady College of Medicine, University of Manitoba, Winnipeg, Manitoba, Canada
- Paul Albrechtsen Research Institute, CancerCare Manitoba, Winnipeg, Manitoba, Canada
| | - Heidi Rothenmund
- Program of Genetics and Metabolism, Shared Health Diagnostics, Winnipeg, Manitoba, Canada
- Rady Faculty of Health Sciences, Department of Biochemistry and Medical Genetics, Max Rady College of Medicine, University of Manitoba, Winnipeg, Manitoba, Canada
| | - Hilary Racher
- Dynacare, Brampton, Ontario, Canada
- Department of Laboratory Medicine and Pathobiology, University of Toronto, Toronto, Ontario, Canada
| | | | - Stephen E Pautler
- Departments of Urology and Oncology, Western University, London, Ontario, Canada
| | - Alison Rusnak
- Children's Hospital of Eastern Ontario, Ottawa, Ontario, Canada
| | - Mari Rutka
- Patient Partner, Toronto, Ontario, Canada
| | - Holly Etchegary
- Clinical Epidemiology, Memorial University of Newfoundland, St John's, Newfoundland, Canada
| | | | - Pardeep Kaurah
- Department of Medical Genetics, The University of British Columbia, Vancouver, British Columbia, Canada
| | - Lesa Dawson
- Department of Obstetrics and Gynaecology, Memorial University of Newfoundland, St John's, Newfoundland, Canada
- Department of Obstetrics and Gynaecology, The University of British Columbia, Vancouver, British Columbia, Canada
| | - Andrea Hawrysh
- Division of Medical Genetics, Saskatchewan Health Authority, Saskatoon, Saskatchewan, Canada
| | - Thomas Ward
- Zane Cohen Centre for Digestive Diseases, Sinai Health System, Toronto, Ontario, Canada
- University of Toronto, Toronto, Ontario, Canada
| | - Angela Bedard
- Hereditary Cancer Program, BC Cancer Agency, Victoria, British Columbia, Canada
- Department of Medical Genetics, The University of British Columbia, Vancouver, British Columbia, Canada
| | - Brandon S Sheffield
- Department of Laboratory Medicine, William Osler Health System, Brampton, Ontario, Canada
| | - Jordan Lerner-Ellis
- University of Toronto, Toronto, Ontario, Canada
- Pathology and Laboratory Medicine, Sinai Health System, Toronto, Ontario, Canada
| | - Karine Jacob
- McGill University Health Centre, Montreal, Québec, Canada
| | - Sarah Ferguson
- Division of Gynecologic Oncology, University Health Network, Toronto, Ontario, Canada
| | - Christina A Kim
- Rady Faculty of Health Sciences, Department of Internal Medicine, Max Rady College of Medicine, University of Manitoba, Winnipeg, Manitoba, Canada
- Paul Albrechtsen Research Institute, CancerCare Manitoba, Winnipeg, Manitoba, Canada
| | | | - Kimberly Dornan
- Clinical and Metabolic Genetics Program, Hereditary Cancer Clinic, Alberta Health Services, Edmonton, Alberta, Canada
| | - Larissa Waldman
- Department of Molecular Genetics, University of Toronto, Toronto, Ontario, Canada
- Sunnybrook Health Sciences Centre, Toronto, Ontario, Canada
| | - Spring Holter
- Princess Margaret Hospital, Toronto, Ontario, Canada
| | - Janice Horte
- Medical Genetics, Edmonton Hereditary Cancer Clinic, University of Alberta Hospital, Edmonton, Alberta, Canada
- Stollery Children's Hospital, Edmonton, Alberta, Canada
| | - Angela Hyde
- Dr H Bliss Murphy Cancer Centre, St John's, Newfoundland, Canada
| | - Janice Kwon
- Department of Obstetrics and Gynaecology, The University of British Columbia, Vancouver, British Columbia, Canada
| | - Andree MacMillan
- Provincial Medical Genetics Program, Provincial Medical Genetics Program, St John's, Newfoundland, Canada
| | - Melanie O'Loughlin
- Hereditary Cancer Program, BC Cancer Agency, Victoria, British Columbia, Canada
| | - Uri Tabori
- University of Toronto, Toronto, Ontario, Canada
- Division of Hematology/Oncology, The Hospital for Sick Children, Toronto, Ontario, Canada
| | - Steven Gallinger
- Wallace McCain Centre for Pancreatic Cancer, Princess Margaret Hospital, Toronto, Ontario, Canada
- PanCuRx Translational Research Initiative, Ontario Institute for Cancer Research, Toronto, Ontario, Canada
| | - Raymond Kim
- Fred A Litwin Family Centre in Genetic Medicine, University Health Network, Toronto, Ontario, Canada
- Ontario Institute for Cancer Research, Toronto, Ontario, Canada
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Chen Z, Cao H, Zhang J, Zhong W, Teng X. The impact of preoperative treatment on mismatch repair protein and HER2 expression in colorectal cancer: an analysis of paired samples. BMC Cancer 2024; 24:1407. [PMID: 39548392 PMCID: PMC11566055 DOI: 10.1186/s12885-024-13120-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2024] [Accepted: 10/28/2024] [Indexed: 11/18/2024] Open
Abstract
BACKGROUND Colorectal cancer (CRC) is a leading cause of cancer-related mortality, highlighting the necessity for multifaceted treatment strategies, including preoperative treatment (PT), which can enhance surgical outcomes and provide prognostic insights. This study aims to clarify the impact of PT-induced changes in mismatch repair (MMR) and human epidermal growth factor receptor 2 (HER2) expression, potentially informing tailored treatment strategies and improving clinical outcomes for CRC patients. METHODS This retrospective study analyzed 120 paired samples from CRC patients who underwent preoperative treatment, comparing pre- and post-treatment specimens. A control group of 60 untreated surgical specimens was also included. Immunohistochemistry assessed MMR proteins (MSH6, MSH2, MLH1, PMS2) and HER2 expression. MSI status was determined in samples with low MMR expression. RESULTS Compared to pre-treatment samples, post-treatment samples exhibited lower levels of MSH6, MSH2, and total MMR expression, along with higher levels of HER2 expression. However, when compared to the untreated control group, there were no significant differences in the expression of MSH6, total MMR, and HER2. All samples that exhibited weak MMR expression and those that shifted to deficient mismatch repair (dMMR) status following treatment had stable microsatellite status. No clear clinicopathological characteristics or prognostic factors were found to be associated with changes in MMR and HER2 expression, except for the use of fluorouracil or capecitabine, which was related to changes in total MMR scores. ypTNM stage and TRG scores were identified as independent factors affecting disease progression in our study. CONCLUSIONS PT is associated with a reduction in MMR expression, notably for the MSH2 protein, while it does not appear to influence HER2 expression.
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Affiliation(s)
- Zhen Chen
- Department of Pathology, The First Affiliated Hospital of Zhejiang University School of Medicine, No.79, Qingchun Road, Hangzhou, 310000, China
| | - Hui Cao
- Department of Pathology, The First Affiliated Hospital of Zhejiang University School of Medicine, No.79, Qingchun Road, Hangzhou, 310000, China
| | - Jing Zhang
- Department of Pathology, The First Affiliated Hospital of Zhejiang University School of Medicine, No.79, Qingchun Road, Hangzhou, 310000, China
| | - Weixiang Zhong
- Department of Pathology, The First Affiliated Hospital of Zhejiang University School of Medicine, No.79, Qingchun Road, Hangzhou, 310000, China
| | - Xiaodong Teng
- Department of Pathology, The First Affiliated Hospital of Zhejiang University School of Medicine, No.79, Qingchun Road, Hangzhou, 310000, China.
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Shia J, Sanchez-Vega F, Cho S, Chen JF, Chen CT, Bhanot U, Urganci N, Firat C, Ntiamoah P, Isidro RA, Srivastava A, Weiser MR, Mandelker D, Vakiani E, Boland CR, Garcia-Aguilar J, Stadler ZK. MSH6-proficient crypt foci in MSH6 constitutional mismatch repair deficiency: reversion of a frameshifted coding microsatellite to its wild-type sequence. Fam Cancer 2024; 23:569-577. [PMID: 39387980 PMCID: PMC11723700 DOI: 10.1007/s10689-024-00423-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2024] [Accepted: 09/15/2024] [Indexed: 10/12/2024]
Abstract
The discovery of "mismatch repair deficient (MMRd)-crypt foci" in non-neoplastic intestinal mucosa in Lynch syndrome (LS) has significantly enhanced our understanding of how tumors and tumor immunity form and evolve in LS. In this study, we report the frequent presence of "mismatch repair proficient (MMRp)-crypt foci" in both non-neoplastic and neoplastic intestinal mucosa in a patient with constitutional MMR deficiency (CMMRD), who carried a germline MSH6 pathogenic variant (c.3261dupC) in trans with an MSH6 likely pathogenic variant (c.3724_3726del) and whose tissues were otherwise deficient in MMR globally. The MMRp-crypts occurred at a rate of 1.1/100 crypts in non-neoplastic intestinal mucosa and were readily discernible in adenomas > 1 cm. Sequencing analysis revealed normalization of the MSH6c.3261dupC variant in MMRp-adenoma crypts, indicating reverse frameshifting of the exon 5 C8 microsatellite. Interestingly but not surprisingly, the MMRp-adenoma crypts remained microsatellite-instability-high (MSI-H), and shared oncogenic APC mutations with the background MMRd-adenoma. Contrasting with MSH6-CMMRD, no PMS2-CMMRD individuals (0/5) harbored MMRp-crypts. In conclusion, our study documents distinct MMRp-crypts in MSH6-CMMRD, a phenomenon in keeping with MSH6 being a frequent target of MSI-H due to its coding microsatellite and suggesting that MSH6-CMMRD can potentially serve as a unique model system to further our understanding of MSH6's role in MSI-H tumor formation and evolution. Our findings also bear diagnostic implications; when using MMR immunohistochemistry as an ancillary tool in detecting CMMRD, awareness of these MMRp crypts can help avoid diagnostic pitfalls.
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Affiliation(s)
- Jinru Shia
- Department of Pathology and Laboratory Medicine, Memorial Sloan Kettering Cancer Center, New York, NY, USA.
- Colorectal Cancer Research Center, Memorial Sloan Kettering Cancer Center, New York, NY, USA.
| | - Francisco Sanchez-Vega
- Colorectal Cancer Research Center, Memorial Sloan Kettering Cancer Center, New York, NY, USA
- Computational Oncology Service, Department of Epidemiology and Biostatistics, Memorial Sloan Kettering Cancer Center, New York, NY, USA
| | - Stanley Cho
- Department of Pediatrics, Memorial Sloan Kettering Cancer Center, New York, NY, USA
| | - Jie-Fu Chen
- Department of Pathology and Laboratory Medicine, Memorial Sloan Kettering Cancer Center, New York, NY, USA
| | - Chin-Tung Chen
- Colorectal Cancer Research Center, Memorial Sloan Kettering Cancer Center, New York, NY, USA
| | - Umesh Bhanot
- Department of Pathology and Laboratory Medicine, Memorial Sloan Kettering Cancer Center, New York, NY, USA
| | - Nil Urganci
- Department of Pathology and Laboratory Medicine, Memorial Sloan Kettering Cancer Center, New York, NY, USA
- Colorectal Cancer Research Center, Memorial Sloan Kettering Cancer Center, New York, NY, USA
| | - Canan Firat
- Department of Pathology and Laboratory Medicine, Memorial Sloan Kettering Cancer Center, New York, NY, USA
- Colorectal Cancer Research Center, Memorial Sloan Kettering Cancer Center, New York, NY, USA
| | - Peter Ntiamoah
- Department of Pathology and Laboratory Medicine, Memorial Sloan Kettering Cancer Center, New York, NY, USA
| | - Raymond A Isidro
- Department of Pathology and Laboratory Medicine, Memorial Sloan Kettering Cancer Center, New York, NY, USA
| | - Amitabh Srivastava
- Department of Pathology and Laboratory Medicine, Memorial Sloan Kettering Cancer Center, New York, NY, USA
| | - Martin R Weiser
- Colorectal Cancer Research Center, Memorial Sloan Kettering Cancer Center, New York, NY, USA
- Department of Surgery, Memorial Sloan Kettering Cancer Center, New York, NY, USA
| | - Diana Mandelker
- Department of Pathology and Laboratory Medicine, Memorial Sloan Kettering Cancer Center, New York, NY, USA
| | - Efsevia Vakiani
- Department of Pathology and Laboratory Medicine, Memorial Sloan Kettering Cancer Center, New York, NY, USA
- Colorectal Cancer Research Center, Memorial Sloan Kettering Cancer Center, New York, NY, USA
| | | | - Julio Garcia-Aguilar
- Colorectal Cancer Research Center, Memorial Sloan Kettering Cancer Center, New York, NY, USA
- Department of Surgery, Memorial Sloan Kettering Cancer Center, New York, NY, USA
| | - Zsofia K Stadler
- Colorectal Cancer Research Center, Memorial Sloan Kettering Cancer Center, New York, NY, USA
- Department of Medicine, Memorial Sloan Kettering Cancer Center, New York, NY, USA
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Huang YS, Ou YC, Wu CH, Lan J, Huang CC, Fu HC, Huang SW, Huang SY, Wang SC, Lin H. A comparative analysis of MMR immunohistochemistry panels: Evaluating the utility of four-protein versus two-protein panels in endometrial cancer patients. J Formos Med Assoc 2024:S0929-6646(24)00396-6. [PMID: 39183142 DOI: 10.1016/j.jfma.2024.08.028] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2024] [Revised: 08/14/2024] [Accepted: 08/20/2024] [Indexed: 08/27/2024] Open
Abstract
AIMS This study aimed to assess the accuracy of a two-protein panel for mismatch repair (MMR) immunohistochemistry (IHC) compared to a four-protein panel in a cohort of endometrial cancer patients. METHODS The study included patients diagnosed with endometrial cancer between January 2018 and December 2023 with patients underwent MMR IHC staining for the four-protein panel (MSH2, MSH6, MLH1, and PMS2) serving as the reference standard. Various combinations of two proteins were examined and evaluated for their accuracy against the four-protein panel. Sensitivity, negative predictive value (NPV), and negative likelihood ratio were calculated for each combination. McNemar's test was performed to assess discordance, and receiver operating characteristic (ROC) curves were generated to evaluate diagnostic accuracy. RESULTS Of 593 patients, MMR deficiency defined as at least one protein loss was observed in 146 patients (24.62%). When compared with four-protein panel, the highest sensitivity was observed with the MSH6/PMS2 combination (99.32%), followed sequentially by MSH6/MLH1 (97.26%), MSH2/PMS2 (93.15%), MSH2/MLH1 (91.10%), MLH1/PMS2 (79.45%), and MSH2/MSH6 (21.92%). The MSH6/PMS2 combination also demonstrated the best NPV of 99.78% and negative likelihood ratio of 0.01, while MSH6/MLH1 showed satisfactory NPV of 99.11% and negative likelihood ratio of 0.03. McNemar's test revealed no statistical difference between the four-protein panel and the MSH6/PMS2 panel (p = 1.000), and the MSH6/MLH1 panel (p = 0.125). CONCLUSIONS The two-protein panel, particularly MSH6/PMS2, offers high sensitivity and negative predictive value, suggesting its potential as a cost-effective alternative to the four-protein panel in MMR testing for endometrial cancer patients.
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Affiliation(s)
- Yu-Sheng Huang
- Department of Obstetrics and Gynecology, Kaohsiung Chang Gung Memorial Hospital and Chang Gung University College of Medicine, Kaohsiung, Taiwan
| | - Yu-Che Ou
- Department of Obstetrics and Gynecology, Kaohsiung Chang Gung Memorial Hospital and Chang Gung University College of Medicine, Kaohsiung, Taiwan; Department of Obstetrics and Gynecology, Chia-Yi Chang Gung Memorial Hospital, Chia-Yi, Taiwan
| | - Chen-Hsuan Wu
- Department of Obstetrics and Gynecology, Kaohsiung Chang Gung Memorial Hospital and Chang Gung University College of Medicine, Kaohsiung, Taiwan
| | - Jui Lan
- Department of Anatomic Pathology, Kaohsiung Chang Gung Memorial Hospital and Chang Gung University College of Medicine, Kaohsiung, Taiwan
| | - Chao-Cheng Huang
- Department of Anatomic Pathology, Kaohsiung Chang Gung Memorial Hospital and Chang Gung University College of Medicine, Kaohsiung, Taiwan
| | - Hung-Chun Fu
- Department of Obstetrics and Gynecology, Kaohsiung Chang Gung Memorial Hospital and Chang Gung University College of Medicine, Kaohsiung, Taiwan
| | - Szu-Wei Huang
- Department of Obstetrics and Gynecology, Kaohsiung Chang Gung Memorial Hospital and Chang Gung University College of Medicine, Kaohsiung, Taiwan
| | - Szu-Yu Huang
- Department of Obstetrics and Gynecology, Kaohsiung Chang Gung Memorial Hospital and Chang Gung University College of Medicine, Kaohsiung, Taiwan
| | - Shao-Chi Wang
- Department of Obstetrics and Gynecology, Kaohsiung Chang Gung Memorial Hospital and Chang Gung University College of Medicine, Kaohsiung, Taiwan
| | - Hao Lin
- Department of Obstetrics and Gynecology, Kaohsiung Chang Gung Memorial Hospital and Chang Gung University College of Medicine, Kaohsiung, Taiwan.
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Tezuka K, Yamakawa M, Murakami R, Hirai I, Toya R, Suzuki A, Kawamura H, Miyano Y, Sato H, Motoi F. Familial Intraductal Papillary Mucinous Neoplasm Associated With the Germline MSH6 Missense Variant and Progression of Pancreatic cancer. Pancreas 2024; 53:e476-e486. [PMID: 38416847 DOI: 10.1097/mpa.0000000000002313] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 03/01/2024]
Abstract
OBJECTIVES Intraductal papillary mucinous neoplasm (IPMN) in individuals with at least one first-degree relative with IPMN is defined as familial IPMN. However, few studies have reported on familial IPMN, its clinical characteristics, or the associated genetic factors. MATERIALS AND METHODS We report the case of a 58-year-old woman with multifocal IPMN and a mural nodule in the pancreatic body. The patient underwent a distal pancreatectomy and developed pancreatic head cancer 1 year and 6 months postoperatively. The patient had a family history of multifocal IPMN in her father. Therefore, a genetic predisposition to IPMN and pancreatic cancer was suspected. The patient was analyzed for germline variants, and the resected IPMN was subjected to immunohistochemical and somatic variant analyses. RESULTS Next-generation sequencing revealed a heterozygous germline missense variant in exon 5 of MSH6 (c.3197A>G; Tyr1066Cys). The pathogenicity of this variant of uncertain significance was suspected based on multiple in silico analyses, and the same MSH6 variant was identified in the patient's father's colonic adenoma. The mural nodule in the pancreatic body was pathologically diagnosed as a high-grade IPMN with ossification and somatic KRAS and PIK3CA variants. CONCLUSIONS This case revealed a possible genetic factor for familial IPMN development and presented interesting clinicopathological findings.
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Affiliation(s)
| | | | - Ryoko Murakami
- Genome Informatics Unit, Institution for Promotion of Medical Science Research, Yamagata University Faculty of Medicine
| | | | | | | | | | - Yuki Miyano
- Genome Informatics Unit, Institution for Promotion of Medical Science Research, Yamagata University Faculty of Medicine
| | - Hidenori Sato
- Genome Informatics Unit, Institution for Promotion of Medical Science Research, Yamagata University Faculty of Medicine
| | - Fuyuhiko Motoi
- First Department of Surgery, Yamagata University Faculty of Medicine, Yamagata, Japan
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Wang J, Zhang Z, Cai Y, Lu J, Zhang H, Pang J, Wu H, Liang Z. A Comprehensive Study of Heterogeneous Mismatch Repair Expression in Solid Tumors Reveals Different Immunohistochemical Patterns and Distinct Genetic Mechanisms. Am J Surg Pathol 2024; 48:417-425. [PMID: 37997470 DOI: 10.1097/pas.0000000000002158] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2023]
Abstract
OBJECTIVE Immunohistochemistry is routinely performed to detect mismatch repair deficiency in solid tumors. Heterogeneous MMR expression (MMR-het) has been reported occasionally but not systemically studied. METHODS In this study, we depicted MMR-het patterns of 40 tumors of different anatomical sites and analyzed MMR genetic alterations and tumor mutational burdens (TMB) through comprehensive genomic profiling. RESULTS The MMR-het patterns were classified into 4 subgroups: "single-loss" (3 cases), "MLH1/PMS2 double-loss" (16 cases), "MSH2/MSH6 double-loss" (8 cases), and "triple/tetra-loss" (13 cases). Seventeen MMR-het cases exhibited histological heterogeneity, in which MMR protein loss was generally confined to either poorly differentiated or well-differentiated tumor areas. All "single-loss" tumors had MMR somatic mutations and coexisting POLE exonuclease domain mutations. "MLH1/PMS2 double-loss" tumors unexceptionally harbored MLH1 hypermethylation without MMR germline mutations. In the "MSH2/MSH6 double-loss" subgroup, 4 cases had MSH2/MSH6 germline mutations, while another 4 cases had multiple MSH2/MSH6 somatic mutations. Additional POLE exonuclease domain mutations were identified in 2 cases. Tumors in the "triple/tetra-loss" subgroup generally had MLH1 abnormalities (8 MLH1 hypermethylation, 4 MLH1 germline mutation, 1 MLH1 double somatic mutations), and coexistent somatic mutations on MSH2/MSH6 . Thirty-one cases (83.8%) were TMB-H, and all POLE -mutated cases exhibited ultra-high TMB (111.4 to 524.2 mut/Mb). CONCLUSION Our findings highlighted the importance of accurately interpreting heterogeneous MMR protein staining patterns for developing a more efficient personalized genetic investigation strategy.
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Affiliation(s)
- Jing Wang
- Department of Pathology, State Key Laboratory of Complex Severe and Rare Diseases, Molecular Pathology Research Centre, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
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8
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Boyarskikh U, Kechin A, Khrapov E, Fedyanin M, Raskin G, Mukhina M, Kravtsova E, Tsukanov A, Achkasov S, Filipenko M. Detecting Microsatellite Instability in Endometrial, Colon, and Stomach Cancers Using Targeted NGS. Cancers (Basel) 2023; 15:5065. [PMID: 37894432 PMCID: PMC10605658 DOI: 10.3390/cancers15205065] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2023] [Revised: 09/19/2023] [Accepted: 09/19/2023] [Indexed: 10/29/2023] Open
Abstract
PURPOSE To develop a method for testing the MSI based on targeted NGS. METHODS Based on the results of previous studies, 81 microsatellite loci with high variability in MSI-H tumors were selected, and a method for calculating the MSI score was developed. Using the MSI score, we defined the MSI status in endometral (162), colon (153), and stomach (190) cancers. Accuracy of the MSI scores was evaluated by comparison with MMR immunohistochemistry for 137 endometrium (63 dMMR and 74 pMMR), 76 colon (29 dMMR and 47 pMMR), and 81 stomach (8 dMMR and 73 pMMR) cancers. RESULTS Classification of MSS and MSI-H tumors was performed with AUC (0.99), sensitivity (92%), and specificity (98%) for all tumors without division into types. The accuracy of MSI testing in endometrial cancer was lower than for stomach and colon cancer (0.98, 87%, and 100%, respectively). The use of 27 loci only, the most informative for endometrial cancer, increased the overall accuracy (1.00, 99%, and 99%). Comparison of MSI score values in 505 tumors showed that MSI score is significantly higher in colon (p < 10-5) and stomach (p = 0.008) cancer compared with endometrial cancer. CONCLUSION The MSI score accurately determines MSI status for endometrial, colon, and stomach cancers and can be used to quantify the degree of MSI.
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Affiliation(s)
- Ulyana Boyarskikh
- Institute of Chemical Biology and Fundamental Medicine, Siberian Division of the Russian Academy of Sciences, 630090 Novosibirsk, Russia (E.K.); (M.F.)
| | - Andrey Kechin
- Institute of Chemical Biology and Fundamental Medicine, Siberian Division of the Russian Academy of Sciences, 630090 Novosibirsk, Russia (E.K.); (M.F.)
| | - Evgeniy Khrapov
- Institute of Chemical Biology and Fundamental Medicine, Siberian Division of the Russian Academy of Sciences, 630090 Novosibirsk, Russia (E.K.); (M.F.)
| | - Mikhail Fedyanin
- State Budgetary Institution of Health Care of Moscow (Moscow Multidisciplinary Clinical Center “Kommunarka”), 142770 Moscow, Russia
| | - Grigory Raskin
- Dr. Berezin Medical Institute, 197758 St. Petersburg, Russia; (G.R.); (M.M.)
| | - Marina Mukhina
- Dr. Berezin Medical Institute, 197758 St. Petersburg, Russia; (G.R.); (M.M.)
| | - Elena Kravtsova
- Dr. Berezin Medical Institute, 197758 St. Petersburg, Russia; (G.R.); (M.M.)
| | - Aleksey Tsukanov
- Ryzhikh National Medical Research Center of Coloproctology, 123423 Moscow, Russia
| | - Sergey Achkasov
- Ryzhikh National Medical Research Center of Coloproctology, 123423 Moscow, Russia
| | - Maksim Filipenko
- Institute of Chemical Biology and Fundamental Medicine, Siberian Division of the Russian Academy of Sciences, 630090 Novosibirsk, Russia (E.K.); (M.F.)
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9
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Mendoza RP, Wang P, Schulte JJ, Tjota MY, Jani I, Martinez AC, Haridas R, Wanjari P, Steinhardt G, Brown N, Betz BL, Chapel DB, Kertowidjojo E, Yamada SD, Bennett JA. Endometrial Carcinomas With Subclonal Loss of Mismatch Repair Proteins: A Clinicopathologic and Genomic Study. Am J Surg Pathol 2023; 47:589-598. [PMID: 36866757 DOI: 10.1097/pas.0000000000002031] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2022] [Accepted: 01/27/2023] [Indexed: 03/04/2023]
Abstract
Subclonal loss of mismatch repair (MMR) proteins has been described in a small subset of endometrial carcinomas (ECs), but the genomic basis for this phenomenon has received limited attention. Herein, we retrospectively evaluated all ECs with MMR immunohistochemistry (n=285) for subclonal loss, and in those (n=6), performed a detailed clinicopathologic and genomic comparison of the MMR-deficient and MMR-proficient components. Three tumors were FIGO stage IA, and one each stage IB, II, and IIIC2. Patterns of subclonal loss were as follows: (1) 3 FIGO grade 1 endometrioid carcinomas with subclonal MLH1/PMS2, MLH1 promoter hypermethylation, and no MMR gene mutations; (2) POLE -mutated FIGO grade 3 endometrioid carcinoma with subclonal PMS2, and PMS2 and MSH6 mutations limited to the MMR-deficient component; (3) dedifferentiated carcinoma with subclonal MSH2/MSH6, as well as complete loss of MLH1/PMS2, MLH1 promoter hypermethylation, and PMS2 and MSH6 mutations in both components; (4) dedifferentiated carcinoma with subclonal MSH6, and somatic and germline MSH6 mutations in both components, but with a higher allele frequency in MMR-deficient foci. Recurrences occurred in 2 patients, one consisted of the MMR-proficient component from a FIGO 1 endometrioid carcinoma, while the other was from the MSH6 -mutated dedifferentiated endometrioid carcinoma. At the last follow-up (median: 44 mo), 4 patients were alive and disease-free and 2 were alive with disease. In summary, subclonal MMR loss reflects subclonal and often complex genomic and epigenetic alterations, which may have therapeutic implications and therefore must be reported when present. In addition, subclonal loss can occur in both POLE -mutated and Lynch syndrome-associated ECs.
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Affiliation(s)
| | | | - Jefree J Schulte
- Departments of Pathology
- Department of Pathology and Laboratory Medicine, University of Wisconsin, Madison, WI
| | | | - Ina Jani
- Obstetrics and Gynecology, University of Chicago, Chicago, IL
| | - Anna C Martinez
- Departments of Pathology
- Obstetrics and Gynecology, University of Chicago, Chicago, IL
| | | | | | | | - Noah Brown
- Department of Pathology, University of Michigan, Ann Arbor, MI
| | - Bryan L Betz
- Department of Pathology, University of Michigan, Ann Arbor, MI
| | - David B Chapel
- Department of Pathology, University of Michigan, Ann Arbor, MI
| | | | - S D Yamada
- Obstetrics and Gynecology, University of Chicago, Chicago, IL
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10
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Chow RD, Michaels T, Bellone S, Hartwich TM, Bonazzoli E, Iwasaki A, Song E, Santin AD. Distinct Mechanisms of Mismatch-Repair Deficiency Delineate Two Modes of Response to Anti-PD-1 Immunotherapy in Endometrial Carcinoma. Cancer Discov 2023; 13:312-331. [PMID: 36301137 PMCID: PMC9905265 DOI: 10.1158/2159-8290.cd-22-0686] [Citation(s) in RCA: 38] [Impact Index Per Article: 19.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2022] [Revised: 08/29/2022] [Accepted: 10/19/2022] [Indexed: 02/07/2023]
Abstract
Mismatch repair-deficient (MMRd) cancers have varied responses to immune-checkpoint blockade (ICB). We conducted a phase II clinical trial of the PD-1 inhibitor pembrolizumab in 24 patients with MMRd endometrial cancer (NCT02899793). Patients with mutational MMRd tumors (6 patients) had higher response rates and longer survival than those with epigenetic MMRd tumors (18 patients). Mutation burden was higher in tumors with mutational MMRd compared with epigenetic MMRd; however, within each category of MMRd, mutation burden was not correlated with ICB response. Pretreatment JAK1 mutations were not associated with primary resistance to pembrolizumab. Longitudinal single-cell RNA-seq of circulating immune cells revealed contrasting modes of antitumor immunity for mutational versus epigenetic MMRd cancers. Whereas effector CD8+ T cells correlated with regression of mutational MMRd tumors, activated CD16+ NK cells were associated with ICB-responsive epigenetic MMRd tumors. These data highlight the interplay between tumor-intrinsic and tumor-extrinsic factors that influence ICB response. SIGNIFICANCE The molecular mechanism of MMRd is associated with response to anti-PD-1 immunotherapy in endometrial carcinoma. Tumors with epigenetic MMRd or mutational MMRd are correlated with NK cell or CD8+ T cell-driven immunity, respectively. Classifying tumors by the mechanism of MMRd may inform clinical decision-making regarding cancer immunotherapy. This article is highlighted in the In This Issue feature, p. 247.
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Affiliation(s)
- Ryan D. Chow
- Department of Genetics, Yale University, New Haven, Connecticut, USA
- System Biology Institute, Yale University, West Haven, Connecticut, USA
- Corresponding authors: Correspondence to: Ryan D. Chow, Address: 850 West Campus Drive, ISTC 314, West Haven CT 06516, , Phone: 203-737-3825, Eric Song, Address: 300 Cedar Street, Suite S630, New Haven, CT 06519, , Phone: 203-785-2919, Alessandro D. Santin, Address: 333 Cedar Street, PO Box 208063, New Haven, CT 06511, , Phone: 203-737-2280
| | - Tai Michaels
- Department of Immunobiology, Yale University, New Haven, Connecticut, USA
| | - Stefania Bellone
- Smilow Comprehensive Cancer Center, Yale University School of Medicine, New Haven, Connecticut, USA
| | - Tobias M.P. Hartwich
- Department of Obstetrics, Gynecology, and Reproductive Sciences, Yale University School of Medicine, New Haven, Connecticut, USA
| | - Elena Bonazzoli
- Smilow Comprehensive Cancer Center, Yale University School of Medicine, New Haven, Connecticut, USA
| | - Akiko Iwasaki
- Department of Immunobiology, Yale University, New Haven, Connecticut, USA
- Howard Hughes Medical Institute, Yale University, New Haven, Connecticut, USA
| | - Eric Song
- Department of Immunobiology, Yale University, New Haven, Connecticut, USA
- Corresponding authors: Correspondence to: Ryan D. Chow, Address: 850 West Campus Drive, ISTC 314, West Haven CT 06516, , Phone: 203-737-3825, Eric Song, Address: 300 Cedar Street, Suite S630, New Haven, CT 06519, , Phone: 203-785-2919, Alessandro D. Santin, Address: 333 Cedar Street, PO Box 208063, New Haven, CT 06511, , Phone: 203-737-2280
| | - Alessandro D. Santin
- Smilow Comprehensive Cancer Center, Yale University School of Medicine, New Haven, Connecticut, USA
- Corresponding authors: Correspondence to: Ryan D. Chow, Address: 850 West Campus Drive, ISTC 314, West Haven CT 06516, , Phone: 203-737-3825, Eric Song, Address: 300 Cedar Street, Suite S630, New Haven, CT 06519, , Phone: 203-785-2919, Alessandro D. Santin, Address: 333 Cedar Street, PO Box 208063, New Haven, CT 06511, , Phone: 203-737-2280
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11
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Walker R, Georgeson P, Mahmood K, Joo JE, Makalic E, Clendenning M, Como J, Preston S, Joseland S, Pope BJ, Hutchinson RA, Kasem K, Walsh MD, Macrae FA, Win AK, Hopper JL, Mouradov D, Gibbs P, Sieber OM, O'Sullivan DE, Brenner DR, Gallinger S, Jenkins MA, Rosty C, Winship IM, Buchanan DD. Evaluating Multiple Next-Generation Sequencing-Derived Tumor Features to Accurately Predict DNA Mismatch Repair Status. J Mol Diagn 2023; 25:94-109. [PMID: 36396080 PMCID: PMC10424255 DOI: 10.1016/j.jmoldx.2022.10.003] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2022] [Revised: 09/27/2022] [Accepted: 10/20/2022] [Indexed: 11/16/2022] Open
Abstract
Identifying tumor DNA mismatch repair deficiency (dMMR) is important for precision medicine. Tumor features, individually and in combination, derived from whole-exome sequenced (WES) colorectal cancers (CRCs) and panel-sequenced CRCs, endometrial cancers (ECs), and sebaceous skin tumors (SSTs) were assessed for their accuracy in detecting dMMR. CRCs (n = 300) with WES, where mismatch repair status was determined by immunohistochemistry, were assessed for microsatellite instability (MSMuTect, MANTIS, MSIseq, and MSISensor), Catalogue of Somatic Mutations in Cancer tumor mutational signatures, and somatic mutation counts. A 10-fold cross-validation approach (100 repeats) evaluated the dMMR prediction accuracy for i) individual features, ii) Lasso statistical model, and iii) an additive feature combination approach. Panel-sequenced tumors (29 CRCs, 22 ECs, and 20 SSTs) were assessed for the top performing dMMR predicting features/models using these three approaches. For WES CRCs, 10 features provided >80% dMMR prediction accuracy, with MSMuTect, MSIseq, and MANTIS achieving ≥99% accuracy. The Lasso model achieved 98.3% accuracy. The additive feature approach, with three or more of six of MSMuTect, MANTIS, MSIseq, MSISensor, insertion-deletion count, or tumor mutational signature small insertion/deletion 2 + small insertion/deletion 7 achieved 99.7% accuracy. For the panel-sequenced tumors, the additive feature combination approach of three or more of six achieved accuracies of 100%, 95.5%, and 100% for CRCs, ECs, and SSTs, respectively. The microsatellite instability calling tools performed well in WES CRCs; however, an approach combining tumor features may improve dMMR prediction in both WES and panel-sequenced data across tissue types.
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Affiliation(s)
- Romy Walker
- Colorectal Oncogenomics Group, Department of Clinical Pathology, Victorian Comprehensive Cancer Centre, The University of Melbourne, Parkville, Victoria, Australia; University of Melbourne Centre for Cancer Research, Victorian Comprehensive Cancer Centre, The University of Melbourne, Parkville, Victoria, Australia
| | - Peter Georgeson
- Colorectal Oncogenomics Group, Department of Clinical Pathology, Victorian Comprehensive Cancer Centre, The University of Melbourne, Parkville, Victoria, Australia; University of Melbourne Centre for Cancer Research, Victorian Comprehensive Cancer Centre, The University of Melbourne, Parkville, Victoria, Australia
| | - Khalid Mahmood
- Colorectal Oncogenomics Group, Department of Clinical Pathology, Victorian Comprehensive Cancer Centre, The University of Melbourne, Parkville, Victoria, Australia; University of Melbourne Centre for Cancer Research, Victorian Comprehensive Cancer Centre, The University of Melbourne, Parkville, Victoria, Australia; Melbourne Bioinformatics, The University of Melbourne, Melbourne, Victoria, Australia
| | - Jihoon E Joo
- Colorectal Oncogenomics Group, Department of Clinical Pathology, Victorian Comprehensive Cancer Centre, The University of Melbourne, Parkville, Victoria, Australia; University of Melbourne Centre for Cancer Research, Victorian Comprehensive Cancer Centre, The University of Melbourne, Parkville, Victoria, Australia
| | - Enes Makalic
- Centre for Epidemiology and Biostatistics, Melbourne School of Population and Global Health, The University of Melbourne, Carlton, Victoria, Australia
| | - Mark Clendenning
- Colorectal Oncogenomics Group, Department of Clinical Pathology, Victorian Comprehensive Cancer Centre, The University of Melbourne, Parkville, Victoria, Australia; University of Melbourne Centre for Cancer Research, Victorian Comprehensive Cancer Centre, The University of Melbourne, Parkville, Victoria, Australia
| | - Julia Como
- Colorectal Oncogenomics Group, Department of Clinical Pathology, Victorian Comprehensive Cancer Centre, The University of Melbourne, Parkville, Victoria, Australia; University of Melbourne Centre for Cancer Research, Victorian Comprehensive Cancer Centre, The University of Melbourne, Parkville, Victoria, Australia
| | - Susan Preston
- Colorectal Oncogenomics Group, Department of Clinical Pathology, Victorian Comprehensive Cancer Centre, The University of Melbourne, Parkville, Victoria, Australia; University of Melbourne Centre for Cancer Research, Victorian Comprehensive Cancer Centre, The University of Melbourne, Parkville, Victoria, Australia
| | - Sharelle Joseland
- Colorectal Oncogenomics Group, Department of Clinical Pathology, Victorian Comprehensive Cancer Centre, The University of Melbourne, Parkville, Victoria, Australia; University of Melbourne Centre for Cancer Research, Victorian Comprehensive Cancer Centre, The University of Melbourne, Parkville, Victoria, Australia
| | - Bernard J Pope
- Colorectal Oncogenomics Group, Department of Clinical Pathology, Victorian Comprehensive Cancer Centre, The University of Melbourne, Parkville, Victoria, Australia; Melbourne Bioinformatics, The University of Melbourne, Melbourne, Victoria, Australia
| | - Ryan A Hutchinson
- Colorectal Oncogenomics Group, Department of Clinical Pathology, Victorian Comprehensive Cancer Centre, The University of Melbourne, Parkville, Victoria, Australia; University of Melbourne Centre for Cancer Research, Victorian Comprehensive Cancer Centre, The University of Melbourne, Parkville, Victoria, Australia
| | - Kais Kasem
- Department of Clinical Pathology, Medicine Dentistry and Health Sciences, The University of Melbourne, Parkville, Victoria, Australia
| | - Michael D Walsh
- Sullivan Nicolaides Pathology, Bowen Hills, Queensland, Australia
| | - Finlay A Macrae
- Genomic Medicine and Family Cancer Clinic, Royal Melbourne Hospital, Parkville, Melbourne, Victoria, Australia; Colorectal Medicine and Genetics, The Royal Melbourne Hospital, Parkville, Victoria, Australia
| | - Aung K Win
- University of Melbourne Centre for Cancer Research, Victorian Comprehensive Cancer Centre, The University of Melbourne, Parkville, Victoria, Australia; Centre for Epidemiology and Biostatistics, Melbourne School of Population and Global Health, The University of Melbourne, Carlton, Victoria, Australia
| | - John L Hopper
- Centre for Epidemiology and Biostatistics, Melbourne School of Population and Global Health, The University of Melbourne, Carlton, Victoria, Australia
| | - Dmitri Mouradov
- Personalized Oncology Division, The Walter and Eliza Hall Institute of Medial Research, Parkville, Victoria, Australia; Department of Medical Biology, The University of Melbourne, Parkville, Victoria, Australia
| | - Peter Gibbs
- Personalized Oncology Division, The Walter and Eliza Hall Institute of Medial Research, Parkville, Victoria, Australia; Department of Medical Biology, The University of Melbourne, Parkville, Victoria, Australia; Department of Medical Oncology, Western Health, Melbourne, Victoria, Australia
| | - Oliver M Sieber
- Personalized Oncology Division, The Walter and Eliza Hall Institute of Medial Research, Parkville, Victoria, Australia; Department of Medical Biology, The University of Melbourne, Parkville, Victoria, Australia; Department of Surgery, The University of Melbourne, Parkville, Victoria, Australia; Department of Biochemistry and Molecular Biology, Monash University, Clayton, Victoria, Australia
| | - Dylan E O'Sullivan
- Department of Oncology, University of Calgary, Calgary, Alberta, Canada; Department of Community Health Sciences, University of Calgary, Calgary, Alberta, Canada
| | - Darren R Brenner
- Department of Oncology, University of Calgary, Calgary, Alberta, Canada; Department of Community Health Sciences, University of Calgary, Calgary, Alberta, Canada; Department of Cancer Epidemiology and Prevention Research, Alberta Health Services, Calgary, Alberta, Canada
| | - Steven Gallinger
- Ontario Institute for Cancer Research, Toronto, Ontario, Canada; Department of Laboratory Medicine and Pathobiology, University of Toronto, Toronto, Ontario, Canada; Lunenfeld Tanenbaum Research Institute, Mount Sinai Hospital, University of Toronto, Toronto, Ontario, Canada
| | - Mark A Jenkins
- University of Melbourne Centre for Cancer Research, Victorian Comprehensive Cancer Centre, The University of Melbourne, Parkville, Victoria, Australia; Centre for Epidemiology and Biostatistics, Melbourne School of Population and Global Health, The University of Melbourne, Carlton, Victoria, Australia
| | - Christophe Rosty
- Colorectal Oncogenomics Group, Department of Clinical Pathology, Victorian Comprehensive Cancer Centre, The University of Melbourne, Parkville, Victoria, Australia; University of Melbourne Centre for Cancer Research, Victorian Comprehensive Cancer Centre, The University of Melbourne, Parkville, Victoria, Australia; Envoi Specialist Pathologists, Brisbane, Queensland, Australia; University of Queensland, Brisbane, Queensland, Australia
| | - Ingrid M Winship
- Genomic Medicine and Family Cancer Clinic, Royal Melbourne Hospital, Parkville, Melbourne, Victoria, Australia; Department of Medicine, The University of Melbourne, Parkville, Victoria, Australia
| | - Daniel D Buchanan
- Colorectal Oncogenomics Group, Department of Clinical Pathology, Victorian Comprehensive Cancer Centre, The University of Melbourne, Parkville, Victoria, Australia; University of Melbourne Centre for Cancer Research, Victorian Comprehensive Cancer Centre, The University of Melbourne, Parkville, Victoria, Australia; Genomic Medicine and Family Cancer Clinic, Royal Melbourne Hospital, Parkville, Melbourne, Victoria, Australia.
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12
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Detecting mismatch repair deficiency in solid neoplasms: immunohistochemistry, microsatellite instability, or both? Mod Pathol 2022; 35:1515-1528. [PMID: 35668150 DOI: 10.1038/s41379-022-01109-4] [Citation(s) in RCA: 29] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2021] [Revised: 05/08/2022] [Accepted: 05/10/2022] [Indexed: 12/25/2022]
Abstract
In managing patients with solid tumors, the value of detecting the status of tumor DNA mismatch repair function is widely recognized. Mismatch repair protein immunohistochemistry and molecular microsatellite instability testing constitute the two major test modalities currently in use, yet each is associated with caveats and limitations that can be consequential. Most notably, the traditional approach of defining mismatch repair protein immunohistochemistry abnormality by complete loss of staining in all tumor cells is evolving. Partial or clonal loss is becoming recognized as a manifestation of gene abnormality; in some cases, such clonal loss is associated with germline pathogenic variants. The current criteria and cutoff values for defining microsatellite instability-high are developed primarily according to colorectal tumors. Non-colorectal cases, and occasionally even colorectal tumors, that are mismatch repair-deficient by immunohistochemistry but not microsatellite instability-high by current standards are being recognized. Emerging data suggest that these immunohistochemistry abnormal / non-microsatellite instability-high cases warrant further genetic workup for Lynch syndrome detection. Whether these tumors respond to immunotherapy is a question still to be addressed. It is imperative that pathologists as well as clinicians and investigators be aware of such intricacies regarding routine immunohistochemistry and microsatellite instability testing and the results they generate. This review summarizes our current understanding of the advantages and limitations of these tests and offer our view on what constitutes the most optimal strategy in test selection and how best to utilize case context to enhance the interpretation of the test results.
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13
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Ykema BLM, Breekveldt ECH, Carvalho B, van Wezel T, Meijer GA, Kerst M, Schaapveld M, van Leeuwen FE, Snaebjornsson P, van Leerdam ME. Somatic hits in mismatch repair genes in colorectal cancer among non-seminoma testicular cancer survivors. Br J Cancer 2022; 127:1991-1996. [PMID: 36088508 PMCID: PMC9681876 DOI: 10.1038/s41416-022-01972-7] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2022] [Revised: 07/04/2022] [Accepted: 08/24/2022] [Indexed: 11/09/2022] Open
Abstract
BACKGROUND Non-seminoma testicular cancer survivors (TCS) have an increased risk of developing colorectal cancer (CRC) when they have been treated with platinum-based chemotherapy. Previously we demonstrated that among Hodgkin lymphoma survivors (HLS) there is enrichment of rare mismatch repair (MMR) deficient (MMRd) CRCs with somatic hits in MMR genes. We speculate that this phenomenon could also occur among other cancer survivors. We therefore aim to determine the MMR status and its underlying mechanism in CRC among TCS (TCS-CRC). METHODS Thirty TCS-CRC, identified through the Dutch pathology registry, were analysed for MMR proteins by immunohistochemistry. Next-generation sequencing was performed in MMRd CRCs without MLH1 promoter hypermethylation (n = 4). Data were compared with a male cohort with primary CRC (P-CRC, n = 629). RESULTS MMRd was found in 17% of TCS-CRCs vs. 9% in P-CRC (p = 0.13). MMRd was more often caused by somatic double or single hit in MMR genes by mutation or loss of heterozygosity in TCS-CRCs (3/30 (10%) vs. 11/629 (2%) in P-CRCs (p < 0.01)). CONCLUSIONS MMRd CRCs with somatic double or single hit are more frequent in this small cohort of TCS compared with P-CRC. Exposure to anticancer treatments appears to be associated with the development of these rare MMRd CRC among cancer survivors.
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Affiliation(s)
- Berbel L M Ykema
- Department of Gastrointestinal Oncology, Netherlands Cancer Institute, Amsterdam, the Netherlands
| | - Emilie C H Breekveldt
- Department of Gastrointestinal Oncology, Netherlands Cancer Institute, Amsterdam, the Netherlands
| | - Beatriz Carvalho
- Department of Pathology, Netherlands Cancer Institute, Amsterdam, the Netherlands
| | - Tom van Wezel
- Department of Pathology, Netherlands Cancer Institute, Amsterdam, the Netherlands
- Department of Pathology, Leiden University Medical Center, Leiden, the Netherlands
| | - Gerrit A Meijer
- Department of Pathology, Netherlands Cancer Institute, Amsterdam, the Netherlands
| | - Martijn Kerst
- Department of Medical Oncology, Netherlands Cancer Institute, Amsterdam, the Netherlands
| | - Michael Schaapveld
- Department of Epidemiology, Netherlands Cancer Institute, Amsterdam, the Netherlands
| | - Flora E van Leeuwen
- Department of Epidemiology, Netherlands Cancer Institute, Amsterdam, the Netherlands
| | - Petur Snaebjornsson
- Department of Pathology, Netherlands Cancer Institute, Amsterdam, the Netherlands
| | - Monique E van Leerdam
- Department of Gastrointestinal Oncology, Netherlands Cancer Institute, Amsterdam, the Netherlands.
- Department of Gastroenterology and Hepatology, Leiden University Medical Center, Leiden, the Netherlands.
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14
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Reitsam NG, Märkl B, Dintner S, Waidhauser J, Vlasenko D, Grosser B. Concurrent loss of MLH1, PMS2 and MSH6 immunoexpression in digestive system cancers indicating a widespread dysregulation in DNA repair processes. Front Oncol 2022; 12:1019798. [PMID: 36387226 PMCID: PMC9643848 DOI: 10.3389/fonc.2022.1019798] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2022] [Accepted: 10/04/2022] [Indexed: 11/24/2022] Open
Abstract
Immunohistochemical analysis of mismatch repair (MMR) protein expression is widely used to identify tumors with a deficient MMR (dMMR). MMR proteins (MLH1/PMS2 and MSH2/MSH6) work as functional heterodimers, which usually leads to the loss of expression in only one functional MMR heterodimer. Recently, there have been studies showing the simultaneous loss of immunoexpression in proteins of both heterodimers. Yet, this phenomenon has been rarely investigated. In this study, we retrospectively considered cases of different digestive system cancers (gastric cancer, ampullary cancer, small bowel cancer, colorectal cancer), which were immunohistochemically tested for dMMR within a 4-year period at our university hospital (n=352). Of the 103 cases showing dMMR, 5 cases (1.4% of all, 5.1% of dMMR cases) showed a concurrent loss of MLH1, PMS2 and MSH6 immunoexpression, whereas in the other 98 dMMR cases only one MMR heterodimer was affected. MLH1-/PMS2-/MSH6- cancer cases almost arose throughout the entire digestive tract: from the gastric antrum to the left colic flexur. To provide a comprehensive molecular characterization of this MLH1-/PMS2-/MSH6- immunophenotype, tumors were analyzed for microsatellite instability, MLH1 promotor hypermethylation and BRAF exon 15 status. Furthermore, we performed next-generation sequencing focusing on genes related to DNA repair. Here, we could detect pathogenic germline variants as well as multiple sporadic mutations in different genes involved in MMR and homologous recombination repair (HRR) respectively. The affected MMR/HRR-related genes were: ATM, BARD1, BRCA1, CDK12, CHEK1, CHEK2, FANCA, MLH1, MSH6, PALB2, TP53. Considering the biologic function of HRR/MMR proteins as potential drug targets and the low frequency of most of these mutations in digestive system cancers in general, their common occurrence in our MLH1-/PMS2-/MSH6- cases seems to be even more noteworthy, highlighting the need for recognition, awareness and further investigation of this unusual IHC staining pattern.
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Affiliation(s)
- Nic Gabriel Reitsam
- General Pathology and Molecular Diagnostics, Medical Faculty, University of Augsburg, Augsburg, Germany
- *Correspondence: Nic Gabriel Reitsam, ;
| | - Bruno Märkl
- General Pathology and Molecular Diagnostics, Medical Faculty, University of Augsburg, Augsburg, Germany
| | - Sebastian Dintner
- General Pathology and Molecular Diagnostics, Medical Faculty, University of Augsburg, Augsburg, Germany
| | - Johanna Waidhauser
- Department of Hematology and Oncology, University Medical Center Augsburg / University Hospital of Augsburg, Augsburg, Germany
| | - Dmytro Vlasenko
- General, Visceral and Transplantation Surgery, University Hospital of Augsburg, Augsburg, Germany
| | - Bianca Grosser
- General Pathology and Molecular Diagnostics, Medical Faculty, University of Augsburg, Augsburg, Germany
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15
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Huang SW, Lin H, Huang CC, Ou YC, Fu HC, Tsai CC, Changchien CC, Wu CH. Comprehensive Clinicopathologic Analysis for Mismatch Repair Protein Expression in Unselected Endometrial Carcinoma Patients With an Emphasis on the Role of MLH1 Deficiency. Int J Gynecol Pathol 2022; 41:407-416. [PMID: 34347667 DOI: 10.1097/pgp.0000000000000808] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
Screening for mismatch repair (MMR) deficiency in unselected patients with endometrial carcinoma (EC) and the clinicopathologic descriptions of ECs with MMR deficiency have been well demonstrated in Western populations, but studies on Asian populations are relatively scarce. In this study, we described the clinicopathologic features of ECs according to MMR status in unselected Taiwanese patients. We also conducted subgroup analysis of MMR-deficient (dMMR) cases according to the presence or absence of MLH1. Patients diagnosed with ECs between January 2017 and February 2020 at our institution were included. Immunohistochemistry analysis of MLH1, PMS2, MSH2, and MSH6 proteins on endometrial primary tumors and clinicopathologic variables were assessed retrospectively. A total of 231 EC patients were enrolled, of whom 50 (21.6%) had dMMR tumors. Of these 50 cases, 39 had tumors that lacked MLH1 expression and 11 were positive for MLH1. The overall dMMR group was significantly related to older age, parity, and high histologic grade compared with the MMR-proficient (pMMR) group. ECs with MLH1 deficiency were obviously associated with several poor pathologic features, including high histologic grade, lymph node metastasis, and lymphovascular space invasion. Moreover, we first reported that parity and the late age at menopause are strongly correlated with MLH1-related dMMR EC group compared with pMMR group. In conclusion, triaging EC patients into pMMR, MLH1-related dMMR and non-MLH1-related dMMR groups by immunohistochemistry analysis may help clinicians to predict disease behavior and guide further management. The strong association between parity and MLH1-related dMMR ECs warrants further investigation on the underlying mechanism.
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16
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Orr C, Wang C, Firat C, Connell LC, Sheehan MR, Vakiani E, Stadler ZK, Shia J. Primary Clonal Loss of Mismatch Repair Protein on Immunohistochemistry: A Pattern of Abnormality That Warrants Genetic Workup. JCO Precis Oncol 2022; 6:e2200111. [PMID: 35700411 DOI: 10.1200/po.22.00111] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Affiliation(s)
- Christine Orr
- Department of Pathology, Memorial Sloan Kettering Cancer Center, New York, NY.,Department of Pathology and Molecular Medicine, Queen's University, Kingston, Ontario, Canada
| | - Chiyun Wang
- Department of Pathology, Memorial Sloan Kettering Cancer Center, New York, NY
| | - Canan Firat
- Department of Pathology, Memorial Sloan Kettering Cancer Center, New York, NY
| | - Louise C Connell
- Department of Medicine, Memorial Sloan Kettering Cancer Center, New York, NY
| | - Margaret R Sheehan
- Department of Medicine, Memorial Sloan Kettering Cancer Center, New York, NY
| | - Efsevia Vakiani
- Department of Pathology, Memorial Sloan Kettering Cancer Center, New York, NY
| | - Zsofia K Stadler
- Department of Medicine, Memorial Sloan Kettering Cancer Center, New York, NY
| | - Jinru Shia
- Department of Pathology, Memorial Sloan Kettering Cancer Center, New York, NY
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17
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Jaffrelot M, Farés N, Brunac AC, Laurenty AP, Danjoux M, Grand D, Icher S, Meilleroux J, Mery E, Buscail E, Maulat C, Toulas C, Vande Perre P, Chipoulet E, Bonnet D, Staub A, Guimbaud R, Selves J. An unusual phenotype occurs in 15% of mismatch repair-deficient tumors and is associated with non-colorectal cancers and genetic syndromes. Mod Pathol 2022; 35:427-437. [PMID: 34545179 PMCID: PMC8860743 DOI: 10.1038/s41379-021-00918-3] [Citation(s) in RCA: 34] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2020] [Revised: 08/21/2021] [Accepted: 08/27/2021] [Indexed: 02/07/2023]
Abstract
Immunohistochemistry (IHC) and/or MSI-PCR (microsatellite instability-polymerase chain reaction) tests are performed routinely to detect mismatch repair deficiency (MMR-D). Classical MMR-D tumors present a loss of MLH1/PMS2 or MSH2/MSH6 with MSI-High. Other profiles of MMR-D tumors have been described but have been rarely studied. In this study, we established a classification of unusual MMR-D tumors and determined their frequency and clinical impact. All MMR-D tumors identified between 2007 and 2017 were selected. Any profile besides the classical MMR-D phenotype was defined as unusual. For patients with unusual MMR-D tumors, IHC, and PCR data were reviewed, the tumor mutation burden (TMB) was evaluated and clinical and genetic features were collected. Of the 4948 cases of MMR testing, 3800 had both the available IHC and MSI-PCR results and 585 of these had MMR-D. After reviewing the IHC and PCR, 21% of the cases initially identified as unusual MMR-D were reclassified, which resulted in a final identification of 89 unusual MMR-D tumors (15%). Unusual MMR-D tumors were more often associated with non-CRC than classical MMR-D tumors. Unusual MMR-D tumors were classified into four sub-groups: i) isolated loss of PMS2 or MSH6, ii) classical loss of MLH1/PMS2 or MSH2/MSH6 without MSI, iii) four MMR proteins retained with MSI and, iv) complex loss of MMR proteins, with clinical characteristics for each sub-group. TMB-high or -intermediate was shown in 96% of the cancers studied (24/25), which confirmed MMR deficiency. Genetic syndromes were identified in 44.9% (40/89) and 21.4% (106/496) of patients with unusual and classical MMR-D tumors, respectively (P < 0.001). Five patients treated with an immune checkpoint inhibitor (ICI) had a prolonged clinical benefit. Our classification of unusual MMR-D phenotype helps to identify MMR deficiency. Unusual MMR-D phenotype occurs in 15% of MMR-D tumors. A high frequency of genetic syndromes was noted in these patients who could benefit from ICI.
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Affiliation(s)
- Marion Jaffrelot
- grid.411175.70000 0001 1457 2980Department of Digestive Oncology, Centre Hospitalier Universitaire (CHU), Toulouse, France
| | - Nadim Farés
- grid.411175.70000 0001 1457 2980Department of Digestive Oncology, Centre Hospitalier Universitaire (CHU), Toulouse, France ,grid.15781.3a0000 0001 0723 035XUniversité Fédérale Toulouse Midi-Pyrénées, Université Toulouse III Paul Sabatier, INSERM, CRCT, 31330 Toulouse, France ,grid.411175.70000 0001 1457 2980Department of Digestive Surgery, Centre Hospitalier Universitaire (CHU), Toulouse, France
| | - Anne Cécile Brunac
- grid.411175.70000 0001 1457 2980Department of Pathology, Institut Universitaire du Cancer-Oncopole de Toulouse; Centre Hospitalier Universitaire (CHU), Toulouse, France
| | - Anne Pascale Laurenty
- grid.411175.70000 0001 1457 2980Department of Digestive Oncology, Centre Hospitalier Universitaire (CHU), Toulouse, France
| | - Marie Danjoux
- grid.411175.70000 0001 1457 2980Department of Pathology, Institut Universitaire du Cancer-Oncopole de Toulouse; Centre Hospitalier Universitaire (CHU), Toulouse, France
| | - David Grand
- grid.411175.70000 0001 1457 2980Department of Pathology, Institut Universitaire du Cancer-Oncopole de Toulouse; Centre Hospitalier Universitaire (CHU), Toulouse, France
| | - Samira Icher
- grid.411175.70000 0001 1457 2980Department of Pathology, Institut Universitaire du Cancer-Oncopole de Toulouse; Centre Hospitalier Universitaire (CHU), Toulouse, France
| | - Julie Meilleroux
- grid.411175.70000 0001 1457 2980Department of Pathology, Institut Universitaire du Cancer-Oncopole de Toulouse; Centre Hospitalier Universitaire (CHU), Toulouse, France
| | - Eliane Mery
- grid.411175.70000 0001 1457 2980Department of Pathology, Institut Universitaire du Cancer-Oncopole de Toulouse; Centre Hospitalier Universitaire (CHU), Toulouse, France
| | - Etienne Buscail
- grid.411175.70000 0001 1457 2980Department of Oncogenetics, Institut Universitaire du Cancer-Oncopole de Toulouse, Institut Claudius Regaud and Centre Hospitalier Universitaire (CHU), Toulouse, France
| | - Charlotte Maulat
- grid.411175.70000 0001 1457 2980Department of Oncogenetics, Institut Universitaire du Cancer-Oncopole de Toulouse, Institut Claudius Regaud and Centre Hospitalier Universitaire (CHU), Toulouse, France
| | - Christine Toulas
- grid.411175.70000 0001 1457 2980Department of Oncogenetics, Institut Universitaire du Cancer-Oncopole de Toulouse, Institut Claudius Regaud and Centre Hospitalier Universitaire (CHU), Toulouse, France
| | - Pierre Vande Perre
- grid.411175.70000 0001 1457 2980Department of Oncogenetics, Institut Universitaire du Cancer-Oncopole de Toulouse, Institut Claudius Regaud and Centre Hospitalier Universitaire (CHU), Toulouse, France
| | - Edith Chipoulet
- grid.411175.70000 0001 1457 2980Department of Oncogenetics, Institut Universitaire du Cancer-Oncopole de Toulouse, Institut Claudius Regaud and Centre Hospitalier Universitaire (CHU), Toulouse, France
| | - Delphine Bonnet
- grid.411175.70000 0001 1457 2980Department of Oncogenetics, Institut Universitaire du Cancer-Oncopole de Toulouse, Institut Claudius Regaud and Centre Hospitalier Universitaire (CHU), Toulouse, France
| | - Anne Staub
- grid.411175.70000 0001 1457 2980Department of Oncogenetics, Institut Universitaire du Cancer-Oncopole de Toulouse, Institut Claudius Regaud and Centre Hospitalier Universitaire (CHU), Toulouse, France
| | - Rosine Guimbaud
- grid.411175.70000 0001 1457 2980Department of Digestive Oncology, Centre Hospitalier Universitaire (CHU), Toulouse, France ,grid.15781.3a0000 0001 0723 035XUniversité Fédérale Toulouse Midi-Pyrénées, Université Toulouse III Paul Sabatier, INSERM, CRCT, 31330 Toulouse, France ,grid.411175.70000 0001 1457 2980Department of Digestive Surgery, Centre Hospitalier Universitaire (CHU), Toulouse, France
| | - Janick Selves
- Université Fédérale Toulouse Midi-Pyrénées, Université Toulouse III Paul Sabatier, INSERM, CRCT, 31330, Toulouse, France. .,Department of Digestive Surgery, Centre Hospitalier Universitaire (CHU), Toulouse, France.
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18
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Validity of a two-antibody testing algorithm for mismatch repair deficiency testing in cancer; a systematic literature review and meta-analysis. Mod Pathol 2022; 35:1775-1783. [PMID: 36104536 PMCID: PMC9708570 DOI: 10.1038/s41379-022-01149-w] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2022] [Revised: 08/01/2022] [Accepted: 08/04/2022] [Indexed: 12/24/2022]
Abstract
Reflex mismatch repair immunohistochemistry (MMR IHC) testing for MLH1, PMS2, MSH2 and MSH6 is used to screen for Lynch syndrome. Recently MMR-deficiency (MMRd) has been approved as a pan-cancer predictive biomarker for checkpoint inhibitor therapy, leading to a vast increase in the use of MMR IHC in clinical practice. We explored whether immunohistochemical staining with PMS2 and MSH6 can be used as a reliable substitute. This two-antibody testing algorithm has the benefit of saving tissue, cutting costs and saving time. PubMed, Embase and Cochrane library were systematically searched for articles reporting on MMR IHC. The weighed percentage of cases with isolated MLH1 or MSH2 loss or combined MLH1/MSH2 loss alone was analyzed using a random effects model meta-analysis in R. The search yielded 1704 unique citations, of which 131 studies were included, describing 9014 patients. A weighed percentage of 1.1% (95% CI 0.53-18.87, I = 87%) of cases with isolated MLH1 or MSH2 loss or combined MLH1/MSH2 loss alone was observed. In the six articles with the main aim of investigating the two-antibody testing algorithm all MMRd cases were detected with the two-antibody testing algorithm, there were no cases with isolated MLH1 or MSH2 loss or combined MLH1/MSH2 loss alone. This high detection rate of MMRd of the two-antibody testing algorithm supports its use in clinical practice by specialized pathologists. Staining of all four antibodies should remain the standard in cases with equivocal results of the two-antibody testing algorithm. Finally, educational sessions in which staining pattern pitfalls are discussed will continue to be important.
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19
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Antill Y, Buchanan DD, Scott CL. Mismatch repair and clinical response to immune checkpoint inhibitors in endometrial cancer. Cancer 2021; 128:1157-1161. [PMID: 34875102 PMCID: PMC9300166 DOI: 10.1002/cncr.34024] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2021] [Revised: 10/09/2021] [Accepted: 10/14/2021] [Indexed: 12/19/2022]
Abstract
Endometrial cancer is common, and a subset recurs and requires additional treatment. Some of these are recognized as being susceptible to immune therapies and are said to have mismatch repair deficiency (dMMR). However, this clinical trial highlights which cases are more likely to respond well: those containing mutations in genes known as Lynch genes and also some with mutations in POLE/POLD1 (“ultra‐hypermutation” genes). In contrast, the majority of dMMR endometrial cancers have silencing or DNA methylation of one of these genes, MLH1, and do not seem to be as responsive to single‐agent immune therapy. The availability of combination therapies may be important to consider for these women.
This hypothesis‐driving study highlights the need for further evaluation of the interaction between immune checkpoint inhibitor therapy responses and the mechanism of DNA mismatch repair (MMR) deficiency. Although MMR gene germline pathogenic variant carriers and Lynch‐like tumors with double somatic MMR gene mutations are highly likely to respond to a single‐agent immune checkpoint inhibitor (ICI), those with MLH1 hypermethylation may benefit from additional agents to induce an ICI response.
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Affiliation(s)
- Yoland Antill
- Department of Medical Oncology, Cabrini Health, Malvern, Victoria, Australia.,Faculty of Medicine, Dentistry, and Health Sciences, Monash University, Melbourne, Victoria, Australia.,Familial Cancer Centre, Royal Melbourne Hospital, Parkville, Victoria, Australia
| | - Daniel D Buchanan
- Familial Cancer Centre, Royal Melbourne Hospital, Parkville, Victoria, Australia.,Colorectal Oncogenomics Group, Department of Clinical Pathology, University of Melbourne, Parkville, Victoria, Australia.,University of Melbourne Centre for Cancer Research, Victorian Comprehensive Cancer Centre, Parkville, Victoria, Australia.,Genomic Medicine, Royal Melbourne Hospital, Parkville, Victoria, Australia
| | - Clare L Scott
- Familial Cancer Centre, Royal Melbourne Hospital, Parkville, Victoria, Australia.,Cancer Biology and Stem Cells Division, Walter and Eliza Hall Institute of Medical Research, Parkville, Victoria, Australia.,Department of Medical Biology, University of Melbourne, Parkville, Victoria, Australia.,Royal Women's Hospital, Parkville, Victoria, Australia.,Department of Obstetrics and Gynaecology, University of Melbourne, Parkville, Victoria, Australia.,Sir Peter MacCallum Cancer Centre, Department of Oncology, University of Melbourne, Parkville, Victoria, Australia
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20
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Olave MC, Graham RP. Mismatch repair deficiency: The what, how and why it is important. Genes Chromosomes Cancer 2021; 61:314-321. [PMID: 34837268 DOI: 10.1002/gcc.23015] [Citation(s) in RCA: 63] [Impact Index Per Article: 15.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2021] [Revised: 11/17/2021] [Accepted: 11/18/2021] [Indexed: 12/15/2022] Open
Abstract
The mismatch repair system is a major pathway that functions in the maintenance of genomic integrity. It is involved in mitotic and meiotic recombination, apoptosis, immunoglobulin gene rearrangement, somatic hypermutation, and other processes. Deficiencies in mismatch repair give rise to hypermutability and the phenomenon called microsatellite instability. Detection of deficient mismatch repair function or microsatellite instability is used diagnostically, predictively, and prognostically. Specifically, deficient mismatch repair function is used for screening of Lynch syndrome, determining patients who are likely to respond to immune checkpoint inhibition, and to contributes to an understanding of which cancer patients may pursue a more aggressive clinical course. Microsatellite instability can be evaluated directly by polymerase chain reaction (PCR) or indirectly by assessment of mismatch repair protein expression using immunohistochemistry (IHC), and mismatch repair function using next-generation sequencing assays which evaluates homopolymer indels. In this article, we provide a concise practical review on mismatch repair deficiency (MMR-d)/microsatellite instability (MSI), focusing on clinical testing, different testing methods, interpretation of findings, the predictive, and prognostic utility of MSI.
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Affiliation(s)
- Maria C Olave
- Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, Minnesota, USA
| | - Rondell P Graham
- Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, Minnesota, USA
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21
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Concordance analysis of microsatellite instability status between polymerase chain reaction based testing and next generation sequencing for solid tumors. Sci Rep 2021; 11:20003. [PMID: 34625576 PMCID: PMC8501090 DOI: 10.1038/s41598-021-99364-z] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2021] [Accepted: 09/07/2021] [Indexed: 01/16/2023] Open
Abstract
Various malignancies exhibit high microsatellite instability (MSI-H) or mismatch repair deficiency (dMMR). The MSI-IVD kit, a polymerase chain reaction (PCR)-based method, was the first tumor-agnostic companion diagnostic to detect MSI status in MSI-H solid tumors. Recently, next-generation sequencing (NGS), which can also detect MSI-H/dMMR, has been made clinically available; however, its real-world concordance with PCR-based testing of MSI-H/dMMR remains to be investigated. The co-primary end points included the positive and negative predictive values of MSI-H/dMMR. A retrospective analysis of 80 patients who had undergone both MSI testing and NGS between July 2015 and March 2021 was conducted. Five patients were confirmed to have MSI-H in both examinations. Among the 75 patients diagnosed as microsatellite stable (MSS) by PCR-based testing, one with pancreatic cancer was diagnosed as having MSI-H after NGS. One patient with pancreatic cancer was diagnosed as having MSS in both tests was found to have a mutation in MLH1 by NGS, which was confirmed as dMMR by IHC staining. NGS had positive and negative predictive values of 100% (5/5) and 98.7% (74/75), respectively, for MSI-H. The concordance between NGS and PCR-based testing was 98.8% (79/80). Thus, NGS can be useful for evaluating MSI/MMR status in clinical practice and can be an important alternative method for detecting MSI-H/dMMR in the future.
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22
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Ukkola I, Nummela P, Pasanen A, Kero M, Lepistö A, Kytölä S, Bützow R, Ristimäki A. Detection of microsatellite instability with Idylla MSI assay in colorectal and endometrial cancer. Virchows Arch 2021; 479:471-479. [PMID: 33755781 PMCID: PMC8448708 DOI: 10.1007/s00428-021-03082-w] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2021] [Revised: 02/23/2021] [Accepted: 03/11/2021] [Indexed: 02/06/2023]
Abstract
Universal testing of microsatellite instability (MSI) is recommended for colorectal cancer (CRC) and endometrial cancer (EC) to screen for Lynch syndrome and to aid in assessing prognosis and optimal treatment. We compared the performance of Idylla MSI test to immunohistochemistry (IHC) of mismatch repair (MMR) proteins in consecutive series of 100 CRC and 108 EC samples, as well as in retrospective series of 28 CRC and 33 EC specimens with known deficient MMR protein expression. The concordance between the Idylla test and IHC was 100% in all CRC samples (n=128) but lower in EC samples (87.2%; n=141). In the EC samples, sensitivity of Idylla test was 72.7% and specificity 100%. EC MSI/dMMR agreement was 85.4% for MLH1, 87.5% for MSH2, and only 35.3% for MSH6. When we analyzed 14 EC samples that were discrepant, i.e., dMMR using IHC and microsatellite stable using Idylla, with microsatellite markers BAT25 and BAT26, we found four cases to be replication error (RER) positive. All RER positive cases were deficient for MSH6 protein expression. We also re-analyzed EC samples with variable tumor cellularity to determine the limit of detection of the Idylla test and found that a 30% or higher tumor cellularity is required. We conclude that Idylla MSI test offers a sensitive and specific method for CRC diagnostics but is less sensitive in EC samples especially in the case of MSH6 deficiency.
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Affiliation(s)
- Iiris Ukkola
- Department of Pathology, HUSLAB, HUS Diagnostic Center, Helsinki University Hospital and University of Helsinki, P.O. Box 400, HUS, FI-00029, Helsinki, Finland
- Applied Tumor Genomics Research Program, Research Programs Unit, University of Helsinki, Helsinki, Finland
| | - Pirjo Nummela
- Applied Tumor Genomics Research Program, Research Programs Unit, University of Helsinki, Helsinki, Finland
| | - Annukka Pasanen
- Department of Pathology, HUSLAB, HUS Diagnostic Center, Helsinki University Hospital and University of Helsinki, P.O. Box 400, HUS, FI-00029, Helsinki, Finland
| | - Mia Kero
- Department of Pathology, HUSLAB, HUS Diagnostic Center, Helsinki University Hospital and University of Helsinki, P.O. Box 400, HUS, FI-00029, Helsinki, Finland
| | - Anna Lepistö
- Applied Tumor Genomics Research Program, Research Programs Unit, University of Helsinki, Helsinki, Finland
- Department of Gastrointestinal Surgery, Helsinki University Hospital, Helsinki, Finland
| | - Soili Kytölä
- Department of Genetics, HUSLAB, HUS Diagnostic Center, Helsinki University Hospital, Helsinki, Finland
| | - Ralf Bützow
- Department of Pathology, HUSLAB, HUS Diagnostic Center, Helsinki University Hospital and University of Helsinki, P.O. Box 400, HUS, FI-00029, Helsinki, Finland
- Applied Tumor Genomics Research Program, Research Programs Unit, University of Helsinki, Helsinki, Finland
| | - Ari Ristimäki
- Department of Pathology, HUSLAB, HUS Diagnostic Center, Helsinki University Hospital and University of Helsinki, P.O. Box 400, HUS, FI-00029, Helsinki, Finland.
- Applied Tumor Genomics Research Program, Research Programs Unit, University of Helsinki, Helsinki, Finland.
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23
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Kagawa M, Kawakami S, Yamamoto A, Suzuki O, Kamae N, Eguchi H, Okazaki Y, Yamamoto G, Akagi K, Tamaru JI, Yamaguchi T, Arai T, Ishida H. Identification of Lynch syndrome-associated DNA mismatch repair-deficient bladder cancer in a Japanese hospital-based population. Int J Clin Oncol 2021; 26:1524-1532. [PMID: 34213665 DOI: 10.1007/s10147-021-01922-y] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2021] [Accepted: 04/03/2021] [Indexed: 11/29/2022]
Abstract
BACKGROUND The prevalence of Lynch syndrome (LS)-associated DNA mismatch repair (MMR)-deficient bladder cancer (BC) has scarcely been investigated. METHODS Immunohistochemistry for four MMR proteins (MLH1, MSH2, MSH6, and PMS2) was performed in formalin-fixed paraffin-embedded (FFPE) sections prepared from the resected specimens of 618 consecutive newly diagnosed BC cases. Genetic/epigenetic analyses were performed in patients displaying the loss of any MMR proteins in the tumor. RESULTS Of the 618 patients, 9 (1.5%) showed the loss of MMR protein expression via immunohistochemistry; specifically, 3, 3, 2, and 1 patients displayed the loss of MLH1/PMS2, PMS2, MSH6, and MSH2/MSH6, respectively. All nine patients were male with a median age of 68 years (63-79 years). One had been previously diagnosed as having LS with an MSH2 variant. Genetic testing demonstrated the presence of a pathogenic PMS2 variant (n = 1), a variant of uncertain significance in MSH2 (n = 1), and no pathogenic germline variants of the MMR genes (n = 1). One patient with MSH6-deficient BC did not complete the genetic testing because of severe degradation of DNA extracted from the FFPE specimen, but the patient was strongly suspected to have LS because of their history of colon cancer and MSH6-deficient upper urinary tract cancer. There remained a possibility that the remaining four patients who refused genetic testing had LS. CONCLUSIONS The prevalence of LS-associated MMR-deficient BC was estimated to be 0.6-1.1% among unselected BC cases.
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Affiliation(s)
- Makoto Kagawa
- Department of Urology, Saitama Medical Center, Saitama Medical University, 1981 Kamoda, Kawagoe, Saitama, 350-8550, Japan
| | - Satoru Kawakami
- Department of Urology, Saitama Medical Center, Saitama Medical University, 1981 Kamoda, Kawagoe, Saitama, 350-8550, Japan.
| | - Azusa Yamamoto
- Department of Digestive Tract and General Surgery, Saitama Medical Center, Saitama Medical University, Saitama, Japan
| | - Okihide Suzuki
- Department of Digestive Tract and General Surgery, Saitama Medical Center, Saitama Medical University, Saitama, Japan.,Department of Clinical Genetics, Saitama Medical Center, Saitama Medical University, Saitama, Japan
| | - Nao Kamae
- Department of Clinical Genetics, Saitama Medical Center, Saitama Medical University, Saitama, Japan
| | - Hidetaka Eguchi
- Diagnostics and Therapeutics of Intractable Diseases, Intractable Disease Research Center, Graduate School of Medicine, Juntendo University, Tokyo, Japan
| | - Yasushi Okazaki
- Diagnostics and Therapeutics of Intractable Diseases, Intractable Disease Research Center, Graduate School of Medicine, Juntendo University, Tokyo, Japan
| | - Gou Yamamoto
- Division of Molecular Diagnosis and Cancer Prevention, Saitama Prefecture Cancer Center, Saitama, Japan
| | - Kiwamu Akagi
- Division of Molecular Diagnosis and Cancer Prevention, Saitama Prefecture Cancer Center, Saitama, Japan
| | - Jun-Ichi Tamaru
- Department of Pathology, Saitama Medical Center, Saitama Medical University, Saitama, Japan
| | - Tatsuro Yamaguchi
- Department of Surgery, Tokyo Metropolitan Cancer and Infectious Diseases Center Komagome Hospital, Tokyo, Japan
| | - Tomio Arai
- Department of Pathology, Tokyo Metropolitan Geriatric Hospital and Institute of Gerontology, Tokyo, Japan
| | - Hideyuki Ishida
- Department of Digestive Tract and General Surgery, Saitama Medical Center, Saitama Medical University, Saitama, Japan.,Department of Clinical Genetics, Saitama Medical Center, Saitama Medical University, Saitama, Japan
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24
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Japanese Society for Cancer of the Colon and Rectum (JSCCR) guidelines 2020 for the Clinical Practice of Hereditary Colorectal Cancer. Int J Clin Oncol 2021; 26:1353-1419. [PMID: 34185173 PMCID: PMC8286959 DOI: 10.1007/s10147-021-01881-4] [Citation(s) in RCA: 95] [Impact Index Per Article: 23.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2020] [Accepted: 01/10/2021] [Indexed: 12/14/2022]
Abstract
Hereditary colorectal cancer (HCRC) accounts for < 5% of all colorectal cancer cases. Some of the unique characteristics commonly encountered in HCRC cases include early age of onset, synchronous/metachronous cancer occurrence, and multiple cancers in other organs. These characteristics necessitate different management approaches, including diagnosis, treatment or surveillance, from sporadic colorectal cancer management. There are two representative HCRC, named familial adenomatous polyposis and Lynch syndrome. Other than these two HCRC syndromes, related disorders have also been reported. Several guidelines for hereditary disorders have already been published worldwide. In Japan, the first guideline for HCRC was prepared by the Japanese Society for Cancer of the Colon and Rectum (JSCCR), published in 2012 and revised in 2016. This revised version of the guideline was immediately translated into English and published in 2017. Since then, several new findings and novel disease concepts related to HCRC have been discovered. The currently diagnosed HCRC rate in daily clinical practice is relatively low; however, this is predicted to increase in the era of cancer genomic medicine, with the advancement of cancer multi-gene panel testing or whole genome testing, among others. Under these circumstances, the JSCCR guidelines 2020 for HCRC were prepared by consensus among members of the JSCCR HCRC Guideline Committee, based on a careful review of the evidence retrieved from literature searches, and considering the medical health insurance system and actual clinical practice settings in Japan. Herein, we present the English version of the JSCCR guidelines 2020 for HCRC.
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25
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Pope BJ, Clendenning M, Rosty C, Mahmood K, Georgeson P, Joo JE, Walker R, Hutchinson RA, Jayasekara H, Joseland S, Como J, Preston S, Spurdle AB, Macrae FA, Win AK, Hopper JL, Jenkins MA, Winship IM, Buchanan DD. Germline and Tumor Sequencing as a Diagnostic Tool To Resolve Suspected Lynch Syndrome. J Mol Diagn 2021; 23:358-371. [PMID: 33383211 PMCID: PMC7927277 DOI: 10.1016/j.jmoldx.2020.12.003] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2020] [Revised: 11/13/2020] [Accepted: 12/15/2020] [Indexed: 12/22/2022] Open
Abstract
Patients in whom mismatch repair (MMR)-deficient cancer develops in the absence of pathogenic variants of germline MMR genes or somatic hypermethylation of the MLH1 gene promoter are classified as having suspected Lynch syndrome (SLS). Germline whole-genome sequencing (WGS) and targeted and genome-wide tumor sequencing were applied to identify the underlying cause of tumor MMR deficiency in SLS. Germline WGS was performed on samples from 14 cancer-affected patients with SLS, including two sets of first-degree relatives. MMR genes were assessed for germline pathogenic variants, including complex structural rearrangements and noncoding variants. Tumor tissue was assessed for somatic MMR gene mutations using targeted, whole-exome sequencing or WGS. Germline WGS identified pathogenic MMR variants in 3 of the 14 cases (21.4%), including a 9.5-megabase inversion disrupting MSH2 in a mother and daughter. Excluding these 3 MMR carriers, tumor sequencing identified at least two somatic MMR gene mutations in 8 of 11 tumors tested (72.7%). In a second mother-daughter pair, a somatic cause of tumor MMR deficiency was supported by the presence of double somatic MSH2 mutations in their respective tumors. More than 70% of SLS cases had double somatic MMR mutations in the absence of germline pathogenic variants in the MMR or other DNA repair-related genes on WGS, and, therefore, were confidently assigned a noninherited cause of tumor MMR deficiency.
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Affiliation(s)
- Bernard J Pope
- Colorectal Oncogenomics Group, Department of Clinical Pathology, The University of Melbourne, Parkville, Victoria, Australia; Centre for Cancer Research, Victorian Comprehensive Cancer Centre, The University of Melbourne, Parkville, Victoria, Australia; Melbourne Bioinformatics, The University of Melbourne, Parkville, Victoria, Australia
| | - Mark Clendenning
- Colorectal Oncogenomics Group, Department of Clinical Pathology, The University of Melbourne, Parkville, Victoria, Australia; Centre for Cancer Research, Victorian Comprehensive Cancer Centre, The University of Melbourne, Parkville, Victoria, Australia
| | - Christophe Rosty
- Colorectal Oncogenomics Group, Department of Clinical Pathology, The University of Melbourne, Parkville, Victoria, Australia; Centre for Cancer Research, Victorian Comprehensive Cancer Centre, The University of Melbourne, Parkville, Victoria, Australia; Envoi Specialist Pathologists, Brisbane, Queensland, Australia; School of Medicine, University of Queensland, Herston, Queensland, Australia
| | - Khalid Mahmood
- Colorectal Oncogenomics Group, Department of Clinical Pathology, The University of Melbourne, Parkville, Victoria, Australia; Centre for Cancer Research, Victorian Comprehensive Cancer Centre, The University of Melbourne, Parkville, Victoria, Australia; Melbourne Bioinformatics, The University of Melbourne, Parkville, Victoria, Australia
| | - Peter Georgeson
- Colorectal Oncogenomics Group, Department of Clinical Pathology, The University of Melbourne, Parkville, Victoria, Australia; Centre for Cancer Research, Victorian Comprehensive Cancer Centre, The University of Melbourne, Parkville, Victoria, Australia
| | - Jihoon E Joo
- Colorectal Oncogenomics Group, Department of Clinical Pathology, The University of Melbourne, Parkville, Victoria, Australia; Centre for Cancer Research, Victorian Comprehensive Cancer Centre, The University of Melbourne, Parkville, Victoria, Australia
| | - Romy Walker
- Colorectal Oncogenomics Group, Department of Clinical Pathology, The University of Melbourne, Parkville, Victoria, Australia; Centre for Cancer Research, Victorian Comprehensive Cancer Centre, The University of Melbourne, Parkville, Victoria, Australia
| | - Ryan A Hutchinson
- Colorectal Oncogenomics Group, Department of Clinical Pathology, The University of Melbourne, Parkville, Victoria, Australia; Centre for Cancer Research, Victorian Comprehensive Cancer Centre, The University of Melbourne, Parkville, Victoria, Australia
| | - Harindra Jayasekara
- Colorectal Oncogenomics Group, Department of Clinical Pathology, The University of Melbourne, Parkville, Victoria, Australia; Centre for Cancer Research, Victorian Comprehensive Cancer Centre, The University of Melbourne, Parkville, Victoria, Australia; Division of Cancer Epidemiology, Cancer Council Victoria, Melbourne, Victoria, Australia
| | - Sharelle Joseland
- Colorectal Oncogenomics Group, Department of Clinical Pathology, The University of Melbourne, Parkville, Victoria, Australia; Centre for Cancer Research, Victorian Comprehensive Cancer Centre, The University of Melbourne, Parkville, Victoria, Australia
| | - Julia Como
- Colorectal Oncogenomics Group, Department of Clinical Pathology, The University of Melbourne, Parkville, Victoria, Australia; Centre for Cancer Research, Victorian Comprehensive Cancer Centre, The University of Melbourne, Parkville, Victoria, Australia
| | - Susan Preston
- Colorectal Oncogenomics Group, Department of Clinical Pathology, The University of Melbourne, Parkville, Victoria, Australia; Centre for Cancer Research, Victorian Comprehensive Cancer Centre, The University of Melbourne, Parkville, Victoria, Australia
| | - Amanda B Spurdle
- Molecular Cancer Epidemiology Laboratory, Berghofer Medical Research Institute, Queensland Institute of Medical Research, Brisbane, Queensland, Australia
| | - Finlay A Macrae
- Colorectal Medicine and Genetics, The Royal Melbourne Hospital, Parkville, Victoria, Australia; Department of Medicine, The Royal Melbourne Hospital, The University of Melbourne, Parkville, Victoria, Australia; Genomic Medicine and Family Cancer Clinic, The Royal Melbourne Hospital, Parkville, Victoria, Australia
| | - Aung K Win
- Centre for Epidemiology and Biostatistics, The University of Melbourne, Parkville, Victoria, Australia
| | - John L Hopper
- Centre for Epidemiology and Biostatistics, The University of Melbourne, Parkville, Victoria, Australia
| | - Mark A Jenkins
- Centre for Epidemiology and Biostatistics, The University of Melbourne, Parkville, Victoria, Australia
| | - Ingrid M Winship
- Department of Medicine, The Royal Melbourne Hospital, The University of Melbourne, Parkville, Victoria, Australia; Genomic Medicine and Family Cancer Clinic, The Royal Melbourne Hospital, Parkville, Victoria, Australia
| | - Daniel D Buchanan
- Colorectal Oncogenomics Group, Department of Clinical Pathology, The University of Melbourne, Parkville, Victoria, Australia; Centre for Cancer Research, Victorian Comprehensive Cancer Centre, The University of Melbourne, Parkville, Victoria, Australia; Genomic Medicine and Family Cancer Clinic, The Royal Melbourne Hospital, Parkville, Victoria, Australia.
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26
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Shia J. The diversity of tumours with microsatellite instability: molecular mechanisms and impact upon microsatellite instability testing and mismatch repair protein immunohistochemistry. Histopathology 2021; 78:485-497. [PMID: 33010064 DOI: 10.1111/his.14271] [Citation(s) in RCA: 34] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2020] [Revised: 08/31/2020] [Accepted: 09/28/2020] [Indexed: 12/21/2022]
Abstract
Microsatellite instability (MSI) as a distinct molecular phenotype in human neoplasms was first recognised in 1993. Since then there has been tremendous progress in our understanding of this phenotype, including its genomic drivers and functional consequences. Currently, the multiple lines of investigation on MSI seem to have converged upon one important facet: its diversity, both genotypically and phenotypically, and both within and across tumour types. This review article offers a pathologist's perspective on our current understanding of this diversity, and highlights its potentially significant impact on the effective use of our current MSI detection tools: PCR- or sequencing-based MSI testing and mismatch repair protein immunohistochemistry.
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Affiliation(s)
- Jinru Shia
- Department of Pathology, Memorial Sloan Kettering Cancer Center, New York, NY, USA
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27
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Loughrey MB, McGrath J, Coleman HG, Bankhead P, Maxwell P, McGready C, Bingham V, Humphries MP, Craig SG, McQuaid S, Salto-Tellez M, James JA. Identifying mismatch repair-deficient colon cancer: near-perfect concordance between immunohistochemistry and microsatellite instability testing in a large, population-based series. Histopathology 2021; 78:401-413. [PMID: 32791559 DOI: 10.1111/his.14233] [Citation(s) in RCA: 54] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2020] [Revised: 07/30/2020] [Accepted: 08/10/2020] [Indexed: 12/12/2022]
Abstract
AIMS Establishing the mismatch repair (MMR) status of colorectal cancers is important to enable the detection of underlying Lynch syndrome and inform prognosis and therapy. Current testing typically involves either polymerase chain reaction (PCR)-based microsatellite instability (MSI) testing or MMR protein immunohistochemistry (IHC). The aim of this study was to compare these two approaches in a large, population-based cohort of stage 2 and 3 colon cancer cases in Northern Ireland. METHODS AND RESULTS The study used the Promega pentaplex assay to determine MSI status and a four-antibody MMR IHC panel. IHC was applied to tumour tissue microarrays with triplicate tumour sampling, and assessed manually. Of 593 cases with available MSI and MMR IHC results, 136 (22.9%) were MSI-high (MSI-H) and 135 (22.8%) showed abnormal MMR IHC. Concordance was extremely high, with 97.1% of MSI-H cases showing abnormal MMR IHC, and 97.8% of cases with abnormal IHC showing MSI-H status. Under-representation of tumour epithelial cells in samples from heavily inflamed tumours resulted in misclassification of several cases with abnormal MMR IHC as microsatellite-stable. MMR IHC revealed rare cases with unusual patterns of MMR protein expression, unusual combinations of expression loss, or secondary clonal loss of expression, as further illustrated by repeat immunostaining on whole tissue sections. CONCLUSIONS MSI PCR testing and MMR IHC can be considered to be equally proficient tests for establishing MMR/MSI status, when there is awareness of the potential pitfalls of either method. The choice of methodology may depend on available services and expertise.
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Affiliation(s)
- Maurice B Loughrey
- Department of Cellular Pathology, Belfast Health and Social Care Trust, Belfast, UK
- Patrick G. Johnston Centre for Cancer Research, Queen's University Belfast, Belfast, UK
- Centre for Public Health, Queen's University Belfast, Belfast, UK
| | - Jason McGrath
- Precision Medicine Centre of Excellence, Queen's University Belfast, Belfast, UK
| | - Helen G Coleman
- Patrick G. Johnston Centre for Cancer Research, Queen's University Belfast, Belfast, UK
- Centre for Public Health, Queen's University Belfast, Belfast, UK
| | - Peter Bankhead
- Edinburgh Pathology/Institute of Genetics and Molecular Medicine, University of Edinburgh, Edinburgh, UK
| | - Perry Maxwell
- Precision Medicine Centre of Excellence, Queen's University Belfast, Belfast, UK
| | - Claire McGready
- Precision Medicine Centre of Excellence, Queen's University Belfast, Belfast, UK
- Northern Ireland Biobank, Health Sciences Building, Queen's University Belfast, Belfast, UK
| | - Victoria Bingham
- Precision Medicine Centre of Excellence, Queen's University Belfast, Belfast, UK
| | - Matthew P Humphries
- Precision Medicine Centre of Excellence, Queen's University Belfast, Belfast, UK
| | - Stephanie G Craig
- Patrick G. Johnston Centre for Cancer Research, Queen's University Belfast, Belfast, UK
| | - Stephen McQuaid
- Department of Cellular Pathology, Belfast Health and Social Care Trust, Belfast, UK
- Precision Medicine Centre of Excellence, Queen's University Belfast, Belfast, UK
- Northern Ireland Biobank, Health Sciences Building, Queen's University Belfast, Belfast, UK
| | - Manuel Salto-Tellez
- Department of Cellular Pathology, Belfast Health and Social Care Trust, Belfast, UK
- Patrick G. Johnston Centre for Cancer Research, Queen's University Belfast, Belfast, UK
- Precision Medicine Centre of Excellence, Queen's University Belfast, Belfast, UK
| | - Jacqueline A James
- Department of Cellular Pathology, Belfast Health and Social Care Trust, Belfast, UK
- Patrick G. Johnston Centre for Cancer Research, Queen's University Belfast, Belfast, UK
- Precision Medicine Centre of Excellence, Queen's University Belfast, Belfast, UK
- Northern Ireland Biobank, Health Sciences Building, Queen's University Belfast, Belfast, UK
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28
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Yoshida GM, Yáñez JM. Multi-trait GWAS using imputed high-density genotypes from whole-genome sequencing identifies genes associated with body traits in Nile tilapia. BMC Genomics 2021; 22:57. [PMID: 33451291 PMCID: PMC7811220 DOI: 10.1186/s12864-020-07341-z] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2020] [Accepted: 12/22/2020] [Indexed: 12/16/2022] Open
Abstract
Background Body traits are generally controlled by several genes in vertebrates (i.e. polygenes), which in turn make them difficult to identify through association mapping. Increasing the power of association studies by combining approaches such as genotype imputation and multi-trait analysis improves the ability to detect quantitative trait loci associated with polygenic traits, such as body traits. Results A multi-trait genome-wide association study (mtGWAS) was performed to identify quantitative trait loci (QTL) and genes associated with body traits in Nile tilapia (Oreochromis niloticus) using genotypes imputed to whole-genome sequences (WGS). To increase the statistical power of mtGWAS for the detection of genetic associations, summary statistics from single-trait genome-wide association studies (stGWAS) for eight different body traits recorded in 1309 animals were used. The mtGWAS increased the statistical power from the original sample size from 13 to 44%, depending on the trait analyzed. The better resolution of the WGS data, combined with the increased power of the mtGWAS approach, allowed the detection of significant markers which were not previously found in the stGWAS. Some of the lead single nucleotide polymorphisms (SNPs) were found within important functional candidate genes previously associated with growth-related traits in other terrestrial species. For instance, we identified SNP within the α1,6-fucosyltransferase (FUT8), solute carrier family 4 member 2 (SLC4A2), A disintegrin and metalloproteinase with thrombospondin motifs 9 (ADAMTS9) and heart development protein with EGF like domains 1 (HEG1) genes, which have been associated with average daily gain in sheep, osteopetrosis in cattle, chest size in goats, and growth and meat quality in sheep, respectively. Conclusions The high-resolution mtGWAS presented here allowed the identification of significant SNPs, linked to strong functional candidate genes, associated with body traits in Nile tilapia. These results provide further insights about the genetic variants and genes underlying body trait variation in cichlid fish with high accuracy and strong statistical support. Supplementary Information The online version contains supplementary material available at 10.1186/s12864-020-07341-z.
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Affiliation(s)
- Grazyella M Yoshida
- Facultad de Ciencias Veterinarias y Pecuarias, Universidad de Chile, Santiago, Chile
| | - José M Yáñez
- Facultad de Ciencias Veterinarias y Pecuarias, Universidad de Chile, Santiago, Chile. .,Núcleo Milenio INVASAL, Concepción, Chile.
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29
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Bonneville R, Paruchuri A, Wing MR, Krook MA, Reeser JW, Chen HZ, Dao T, Samorodnitsky E, Smith AM, Yu L, Nowacki N, Chen W, Roychowdhury S. Characterization of Clonal Evolution in Microsatellite Unstable Metastatic Cancers through Multiregional Tumor Sequencing. Mol Cancer Res 2020; 19:465-474. [PMID: 33229401 DOI: 10.1158/1541-7786.mcr-19-0955] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2019] [Revised: 07/10/2020] [Accepted: 11/18/2020] [Indexed: 11/16/2022]
Abstract
Microsatellites are short, repetitive segments of DNA, which are dysregulated in mismatch repair-deficient (MMRd) tumors resulting in microsatellite instability (MSI). MSI has been identified in many human cancer types with varying incidence, and microsatellite instability-high (MSI-H) tumors often exhibit increased sensitivity to immune-enhancing therapies such as PD-1/PD-L1 inhibition. Next-generation sequencing (NGS) has permitted advancements in MSI detection, and recent computational advances have enabled characterization of tumor heterogeneity via NGS. However, the evolution and heterogeneity of microsatellite changes in MSI-positive tumors remains poorly described. We determined MSI status in 6 patients using our previously published algorithm, MANTIS, and inferred subclonal composition and phylogeny with Canopy and SuperFreq. We developed a simulated annealing-based method to characterize microsatellite length distributions in specific subclones and assessed the evolution of MSI in the context of tumor heterogeneity. We identified three to eight tumor subclones per patient, and each subclone exhibited MMRd-associated base substitution signatures. We noted that microsatellites tend to shorten over time, and that MMRd fosters heterogeneity by introducing novel mutations throughout the disease course. Some microsatellites are altered among all subclones in a patient, whereas other loci are only altered in particular subclones corresponding to subclonal phylogenetic relationships. Overall, our results indicate that MMRd is a substantial driver of heterogeneity, leading to both MSI and subclonal divergence. IMPLICATIONS: We leveraged subclonal inference to assess clonal evolution based on somatic mutations and microsatellites, which provides insight into MMRd as a dynamic mutagenic process in MSI-H malignancies.
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Affiliation(s)
- Russell Bonneville
- Comprehensive Cancer Center, The Ohio State University, Columbus, Ohio.,Biomedical Sciences Graduate Program, The Ohio State University, Columbus, Ohio
| | - Anoosha Paruchuri
- Comprehensive Cancer Center, The Ohio State University, Columbus, Ohio
| | - Michele R Wing
- Comprehensive Cancer Center, The Ohio State University, Columbus, Ohio
| | - Melanie A Krook
- Comprehensive Cancer Center, The Ohio State University, Columbus, Ohio
| | - Julie W Reeser
- Comprehensive Cancer Center, The Ohio State University, Columbus, Ohio
| | - Hui-Zi Chen
- Comprehensive Cancer Center, The Ohio State University, Columbus, Ohio.,Division of Medical Oncology, Department of Internal Medicine, The Ohio State University, Columbus, Ohio
| | - Thuy Dao
- Comprehensive Cancer Center, The Ohio State University, Columbus, Ohio
| | | | - Amy M Smith
- Comprehensive Cancer Center, The Ohio State University, Columbus, Ohio
| | - Lianbo Yu
- Department of Biomedical Informatics, The Ohio State University, Columbus, Ohio
| | - Nicholas Nowacki
- Department of Pathology, The Ohio State University, Columbus, Ohio
| | - Wei Chen
- Department of Pathology, The Ohio State University, Columbus, Ohio
| | - Sameek Roychowdhury
- Comprehensive Cancer Center, The Ohio State University, Columbus, Ohio. .,Division of Medical Oncology, Department of Internal Medicine, The Ohio State University, Columbus, Ohio
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30
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Vyas M, Firat C, Hechtman JF, Weiser MR, Yaeger R, Vanderbilt C, Benhamida JK, Keshinro A, Zhang L, Ntiamoah P, Gonzalez M, Andrade R, El Dika I, Markowitz AJ, Smith JJ, Garcia-Aguilar J, Vakiani E, Klimstra DS, Stadler ZK, Shia J. Discordant DNA mismatch repair protein status between synchronous or metachronous gastrointestinal carcinomas: frequency, patterns, and molecular etiologies. Fam Cancer 2020; 20:201-213. [PMID: 33033905 DOI: 10.1007/s10689-020-00210-4] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2020] [Accepted: 10/01/2020] [Indexed: 12/16/2022]
Abstract
The widespread use of tumor DNA mismatch repair (MMR) protein immunohistochemistry in gastrointestinal tract (GIT) carcinomas has unveiled cases where the MMR protein status differs between synchronous/metachronous tumors from the same patients. This study aims at examining the frequency, patterns and molecular etiologies of such inter-tumoral MMR discordances. We analyzed a cohort of 2159 colorectal cancer (CRC) patients collected over a 5-year period and found that 1.3% of the patients (27/2159) had ≥ 2 primary CRCs, and 25.9% of the patients with ≥ 2 primary CRCs (7/27) exhibited inter-tumoral MMR discordance. We then combined the seven MMR-discordant CRC patients with three additional MMR-discordant GIT carcinoma patients and evaluated their discordant patterns and associated molecular abnormalities. The 10 patients consisted of 3 patients with Lynch syndrome (LS), 1 with polymerase proofreading-associated polyposis (PAPP), 1 with familial adenomatous polyposis (FAP), and 5 deemed to have no cancer disposing hereditary syndromes. Their MMR discordances were associated with the following etiologies: (1) PMS2-LS manifesting PMS2-deficient cancer at an old age when a co-incidental sporadic MMR-proficient cancer also occurred; (2) microsatellite instability-driven secondary somatic MSH6-inactivation occurring in only one-and not all-PMS2-LS associated MMR-deficient carcinomas; (3) "compound LS" with germline mutations in two MMR genes manifesting different tumors with deficiencies in different MMR proteins; (4) PAPP or FAP syndrome-associated MMR-proficient cancer co-occurring metachronously with a somatic MMR-deficient cancer; and (5) non-syndromic patients with sporadic MMR-proficient cancers co-occurring synchronously/metachronously with sporadic MMR-deficient cancers. Our study thus suggests that inter-tumoral MMR discordance is not uncommon among patients with multiple primary GIT carcinomas (25.9% in patients with ≥ 2 CRCs), and may be associated with widely varied molecular etiologies. Awareness of these patterns is essential in ensuring the most effective strategies in both LS detection and treatment decision-making. When selecting patients for immunotherapy, MMR testing should be performed on the tumor or tumors that are being treated.
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Affiliation(s)
- Monika Vyas
- Department of Pathology, Memorial Sloan Kettering Cancer Center, New York, NY, USA.,Department of Pathology, Beth Israel Deaconess Medical Center, Boston, MA, USA
| | - Canan Firat
- Department of Pathology, Memorial Sloan Kettering Cancer Center, New York, NY, USA
| | - Jaclyn F Hechtman
- Department of Pathology, Memorial Sloan Kettering Cancer Center, New York, NY, USA
| | - Martin R Weiser
- Department of Surgery, Colorectal Service, Memorial Sloan Kettering Cancer Center, New York, NY, USA
| | - Rona Yaeger
- Department of Medicine, Memorial Sloan Kettering Cancer Center, New York, NY, USA
| | - Chad Vanderbilt
- Department of Pathology, Memorial Sloan Kettering Cancer Center, New York, NY, USA
| | - Jamal K Benhamida
- Department of Pathology, Memorial Sloan Kettering Cancer Center, New York, NY, USA
| | - Ajaratu Keshinro
- Department of Surgery, Colorectal Service, Memorial Sloan Kettering Cancer Center, New York, NY, USA
| | - Liying Zhang
- Department of Pathology and Laboratory Medicine, David Geffen School of Medicine, University of California at Los Angeles (UCLA), Los Angeles, CA, USA
| | - Peter Ntiamoah
- Department of Pathology, Memorial Sloan Kettering Cancer Center, New York, NY, USA
| | - Marco Gonzalez
- Department of Pathology, Memorial Sloan Kettering Cancer Center, New York, NY, USA
| | - Rebecca Andrade
- Department of Pathology, Memorial Sloan Kettering Cancer Center, New York, NY, USA
| | - Imane El Dika
- Department of Medicine, Memorial Sloan Kettering Cancer Center, New York, NY, USA
| | - Arnold J Markowitz
- Department of Medicine, Memorial Sloan Kettering Cancer Center, New York, NY, USA
| | - J Joshua Smith
- Department of Surgery, Colorectal Service, Memorial Sloan Kettering Cancer Center, New York, NY, USA
| | - Julio Garcia-Aguilar
- Department of Surgery, Colorectal Service, Memorial Sloan Kettering Cancer Center, New York, NY, USA
| | - Efsevia Vakiani
- Department of Pathology, Memorial Sloan Kettering Cancer Center, New York, NY, USA
| | - David S Klimstra
- Department of Pathology, Memorial Sloan Kettering Cancer Center, New York, NY, USA
| | - Zsofia K Stadler
- Department of Medicine, Memorial Sloan Kettering Cancer Center, New York, NY, USA.
| | - Jinru Shia
- Department of Pathology, Memorial Sloan Kettering Cancer Center, New York, NY, USA.
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31
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Next generation sequencing to decipher concurrent loss of PMS2 and MSH6 in colorectal cancer. Diagn Pathol 2020; 15:84. [PMID: 32664968 PMCID: PMC7362514 DOI: 10.1186/s13000-020-01001-2] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2020] [Accepted: 07/08/2020] [Indexed: 12/16/2022] Open
Abstract
Background Immunohistochemistry (IHQ) is commonly used for the detection of mismatch repair proteins deficiency (MMRD). One very infrequent abnormal pattern of MMR protein expression is the loss of PMS2 and MSH6, with intact expression of MLH1 and MSH2. Case presentation We review the frequency of this MMRD IHC pattern among 108 colorectal (CRCs) and 35 endometrial cancers in our files with loss of expression of at least one protein, and present two CRCs showing loss of PMS2 and MSH6 protein expression (1.9% of CRCs). NGS analysis of these tumours identified PMS2 mutations (R134* germline mutation in one tumour and M1R and c.1239delA somatic mutation in the other) as the primary event and somatic MSH6 mutation (c.3261dupC) as the secondary event in both tumours. Conclusions This study suggests that Next Generation Sequencing (NGS) tumour analysis should be considered in the algorithm of Lynch syndrome screening to detect MMR gen somatic mutation in inconclusive cases.
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Akabane S, Hinoi T, Akagi K, Yamamoto H, Sada H, Shimizu Y, Shimizu W, Sudo T, Onoe T, Ishiyama K, Suzuki T, Tazawa H, Hadano N, Misumi T, Kojima M, Kubota H, Taniyama D, Kuraoka K, Tashiro H. A case of Turcot's syndrome type 1 with loss of immunoexpression of MSH6 in colon cancer and liver metastasis due to secondary somatic mutation in coding mononucleotide (C)8 tract: a case report. BMC MEDICAL GENETICS 2020; 21:141. [PMID: 32611331 PMCID: PMC7345515 DOI: 10.1186/s12881-020-01079-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/24/2019] [Accepted: 06/25/2020] [Indexed: 11/10/2022]
Abstract
BACKGROUND Lynch syndrome (LS), which is known as a hereditary cancer syndrome, is distinguished by microsatellite instability, represented by the altered number of repetitive sequences in the coding and/or non-coding region. Immunohistochemical staining (IHC) of DNA mismatch repair (MMR) proteins (e.g., MLH1, MSH2, MSH6, and PMS2) has been recognized as an useful technique for screening of LS. Previous study has shown that the assessment of IHC, however, requires specific caution due to variable staining patterns even without germline mutations in MMR genes. CASE PRESENTATION A 48-year-old man, who had been treated for anaplastic astrocytoma, was referred to our department for the precise examination of progressing anemia. Whole-body examination revealed two advanced carcinomas in descending colon and stomach. A hypo-vascular mass lesion was detected in liver as well. Pathological diagnosis (on surgical specimens) was poorly differentiated adenocarcinoma in descending colon, moderately differentiated tubular adenocarcinoma in stomach, and liver metastasis, which is possibly from colon. It was suspected that this case would be Turcot's syndrome-type-1 due to its specific family history having two cases of colon cancer within the second relatives. Pathogenic frameshift mutations in codon 618 of MLH1 gene was identified. Immunohistochemical analyses (IHC) demonstrated complete loss of MLH1 immuno-expression as well as of PMS2 except for those in brain tumor. Although frameshift mutation was not found in MSH6 gene, histological expression of MSH6 was patchy in primary colon carcinoma and was completely lost in the metastatic site in liver. MSH6 expression in gastric carcinoma, a coincidental cancer in this case, was intact. An abnormal (C)8 region was identified by the cloned PCR of colon and liver tumors but not from gastric cancer. Frameshift mutation in a (C)8 tract in exon 5 of the MSH6 gene was also detected in liver metastasis. CONCLUSION This case supports a plausible mechanism, proposed by a previous literature, for the reduced expression of MSH6 in a somatic mutation manner, which might preferentially happen in colon cancer rather than in stomach carcinoma in MLH1/PMS2-deficient type of Turcot's syndrome type 1.
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Affiliation(s)
- Shintaro Akabane
- Department of Surgery, National Hospital Organization, Kure Medical Center and Chugoku Cancer Center, 3-1, Aoyama-cho, Kure City, Hiroshima, 737-0023 Japan
- Department of Gastroenterological and Transplant Surgery, Graduate School of Biomedical & Health Sciences, Hiroshima University, 1-2-3 Kasumi, Minami-ku, Hiroshima, 734-8551 Japan
| | - Takao Hinoi
- Department of Surgery, National Hospital Organization, Kure Medical Center and Chugoku Cancer Center, 3-1, Aoyama-cho, Kure City, Hiroshima, 737-0023 Japan
- Department of Gastroenterological and Transplant Surgery, Graduate School of Biomedical & Health Sciences, Hiroshima University, 1-2-3 Kasumi, Minami-ku, Hiroshima, 734-8551 Japan
- Department of Clinical and Molecular Genetics, Hiroshima University Hospital, 1-2-3 Kasumi, Minami-ku, Hiroshima, 734-8551 Japan
| | - Kiwamu Akagi
- Department of Molecular Diagnosis and Cancer Prevention, Saitama Cancer Center, 3-1, Aoyama-cho, Kure City, Hiroshima, 737-0023 Japan
| | - Hideki Yamamoto
- Department of Clinical Laboratory, National Hospital Organization, Kure Medical Center and Chugoku Cancer Center, 3-1, Aoyama-cho, Kure City, Hiroshima, 737-0023 Japan
| | - Haruki Sada
- Department of Gastroenterological and Transplant Surgery, Graduate School of Biomedical & Health Sciences, Hiroshima University, 1-2-3 Kasumi, Minami-ku, Hiroshima, 734-8551 Japan
| | - Yosuke Shimizu
- Department of Surgery, National Hospital Organization, Kure Medical Center and Chugoku Cancer Center, 3-1, Aoyama-cho, Kure City, Hiroshima, 737-0023 Japan
| | - Wataru Shimizu
- Department of Surgery, National Hospital Organization, Kure Medical Center and Chugoku Cancer Center, 3-1, Aoyama-cho, Kure City, Hiroshima, 737-0023 Japan
| | - Takeshi Sudo
- Department of Surgery, National Hospital Organization, Kure Medical Center and Chugoku Cancer Center, 3-1, Aoyama-cho, Kure City, Hiroshima, 737-0023 Japan
| | - Takashi Onoe
- Department of Surgery, National Hospital Organization, Kure Medical Center and Chugoku Cancer Center, 3-1, Aoyama-cho, Kure City, Hiroshima, 737-0023 Japan
- Department of Gastroenterological and Transplant Surgery, Graduate School of Biomedical & Health Sciences, Hiroshima University, 1-2-3 Kasumi, Minami-ku, Hiroshima, 734-8551 Japan
| | - Kohei Ishiyama
- Department of Surgery, National Hospital Organization, Kure Medical Center and Chugoku Cancer Center, 3-1, Aoyama-cho, Kure City, Hiroshima, 737-0023 Japan
- Department of Gastroenterological and Transplant Surgery, Graduate School of Biomedical & Health Sciences, Hiroshima University, 1-2-3 Kasumi, Minami-ku, Hiroshima, 734-8551 Japan
| | - Takahisa Suzuki
- Department of Surgery, National Hospital Organization, Kure Medical Center and Chugoku Cancer Center, 3-1, Aoyama-cho, Kure City, Hiroshima, 737-0023 Japan
- Department of Gastroenterological and Transplant Surgery, Graduate School of Biomedical & Health Sciences, Hiroshima University, 1-2-3 Kasumi, Minami-ku, Hiroshima, 734-8551 Japan
| | - Hirofumi Tazawa
- Department of Surgery, National Hospital Organization, Kure Medical Center and Chugoku Cancer Center, 3-1, Aoyama-cho, Kure City, Hiroshima, 737-0023 Japan
| | - Naoto Hadano
- Department of Surgery, National Hospital Organization, Kure Medical Center and Chugoku Cancer Center, 3-1, Aoyama-cho, Kure City, Hiroshima, 737-0023 Japan
| | - Toshihiro Misumi
- Department of Surgery, National Hospital Organization, Kure Medical Center and Chugoku Cancer Center, 3-1, Aoyama-cho, Kure City, Hiroshima, 737-0023 Japan
| | - Masato Kojima
- Department of Surgery, National Hospital Organization, Kure Medical Center and Chugoku Cancer Center, 3-1, Aoyama-cho, Kure City, Hiroshima, 737-0023 Japan
| | - Haruna Kubota
- Department of Surgery, National Hospital Organization, Kure Medical Center and Chugoku Cancer Center, 3-1, Aoyama-cho, Kure City, Hiroshima, 737-0023 Japan
| | - Daiki Taniyama
- Department of Diagnositic Pathology, National Hospital Organization, Kure Medical Center and Chugoku Cancer Center, 3-1, Aoyama-cho, Kure City, Hiroshima, 737-0023 Japan
| | - Kazuya Kuraoka
- Department of Diagnositic Pathology, National Hospital Organization, Kure Medical Center and Chugoku Cancer Center, 3-1, Aoyama-cho, Kure City, Hiroshima, 737-0023 Japan
| | - Hirotaka Tashiro
- Department of Surgery, National Hospital Organization, Kure Medical Center and Chugoku Cancer Center, 3-1, Aoyama-cho, Kure City, Hiroshima, 737-0023 Japan
- Department of Gastroenterological and Transplant Surgery, Graduate School of Biomedical & Health Sciences, Hiroshima University, 1-2-3 Kasumi, Minami-ku, Hiroshima, 734-8551 Japan
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Otsuka H, Murakami Y, Uemura K, Kondo N, Nakagawa N, Okada K, Seo S, Takahashi S. Immunohistological evaluation of mismatch repair deficiency in pancreatic ductal adenocarcinoma treated with surgical resection. JOURNAL OF HEPATO-BILIARY-PANCREATIC SCIENCES 2020; 27:421-428. [PMID: 32219999 DOI: 10.1002/jhbp.737] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/26/2019] [Revised: 03/16/2020] [Accepted: 03/18/2020] [Indexed: 11/06/2022]
Abstract
BACKGROUND The frequency and prognosis of resected deficient mismatch repair (dMMR) pancreatic ductal adenocarcinoma (PDAC) remain unclear. This study was designed to assess the frequency of dMMR and its clinicopathological relevance in Japanese patients with PDAC treated with surgical resection. METHODS A total of 400 consecutive patients with PDAC who underwent surgical resection at Hiroshima University were enrolled. Immunohistochemical staining with four antibodies including MLH1, MSH2, MSH6, and PMS2 was used to determine the presence of dMMR in PDAC specimens. Statistical analyses were applied to evaluate the frequency and clinical outcomes of these patients. RESULTS Of these 400 patients, five (1.3%) had dMMR (two had MLH1 deficiency, two had PMS2 deficiency, and one had MSH2 deficiency). We found a significantly different histological differentiation pattern between patients with dMMR and those with proficient mismatch repair (pMMR) (P = .03). Univariate survival analysis revealed no significant differences between dMMR and pMMR in recurrence-free survival (P = .268) or overall survival (P = .173). CONCLUSIONS The incidence of dMMR in Japanese patients with resected PDAC is low, and we found no ethnic-specific differences when comparing the incidence to that in Caucasian patients. In the current study, no significant difference was found in recurrence-free and overall survival between patients with dMMR and pMMR.
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Affiliation(s)
- Hiroyuki Otsuka
- Department of Surgery, Graduate School of Biomedical and Health Sciences, Hiroshima University, Hiroshima, Japan
| | - Yoshiaki Murakami
- Department of Surgery, Graduate School of Biomedical and Health Sciences, Hiroshima University, Hiroshima, Japan
| | - Kenichiro Uemura
- Department of Surgery, Graduate School of Biomedical and Health Sciences, Hiroshima University, Hiroshima, Japan
| | - Naru Kondo
- Department of Surgery, Graduate School of Biomedical and Health Sciences, Hiroshima University, Hiroshima, Japan
| | - Naoya Nakagawa
- Department of Surgery, Graduate School of Biomedical and Health Sciences, Hiroshima University, Hiroshima, Japan
| | - Kenjiro Okada
- Department of Surgery, Graduate School of Biomedical and Health Sciences, Hiroshima University, Hiroshima, Japan
| | - Shingo Seo
- Department of Surgery, Graduate School of Biomedical and Health Sciences, Hiroshima University, Hiroshima, Japan
| | - Shinya Takahashi
- Department of Surgery, Graduate School of Biomedical and Health Sciences, Hiroshima University, Hiroshima, Japan
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Cerretelli G, Ager A, Arends MJ, Frayling IM. Molecular pathology of Lynch syndrome. J Pathol 2020; 250:518-531. [PMID: 32141610 DOI: 10.1002/path.5422] [Citation(s) in RCA: 101] [Impact Index Per Article: 20.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2020] [Revised: 03/02/2020] [Accepted: 03/03/2020] [Indexed: 12/18/2022]
Abstract
Lynch syndrome (LS) is characterised by predisposition to colorectal, endometrial, and other cancers and is caused by inherited pathogenic variants affecting the DNA mismatch repair (MMR) genes MLH1, MSH2, MSH6, and PMS2. It is probably the most common predisposition to cancer, having an estimated prevalence of between 1/100 and 1/180. Resources such as the International Society for Gastrointestinal Hereditary Cancer's MMR gene variant database, the Prospective Lynch Syndrome Database (PLSD), and the Colon Cancer Family Register (CCFR), as well as pathological and immunological studies, are enabling advances in the understanding of LS. These include defined criteria by which to interpret gene variants, the function of MMR in the normal control of apoptosis, definition of the risks of the various cancers, and the mechanisms and pathways by which the colorectal and endometrial tumours develop, including the critical role of the immune system. Colorectal cancers in LS can develop along three pathways, including flat intramucosal lesions, which depend on the underlying affected MMR gene. This gives insights into the limitations of colonoscopic surveillance and highlights the need for other forms of anti-cancer prophylaxis in LS. Finally, it shows that the processes of autoimmunisation and immunoediting fundamentally constrain the development of tumours in LS and explain the efficacy of immune checkpoint blockade therapy in MMR-deficient tumours. © 2020 Pathological Society of Great Britain and Ireland. Published by John Wiley & Sons, Ltd.
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Affiliation(s)
- Guia Cerretelli
- Division of Pathology, Cancer Research UK Edinburgh Centre, University of Edinburgh, Edinburgh, UK
| | - Ann Ager
- Division of Infection and Immunity, School of Medicine and Systems Immunity Research Institute, Cardiff University, Cardiff, UK
| | - Mark J Arends
- Division of Pathology, Cancer Research UK Edinburgh Centre, University of Edinburgh, Edinburgh, UK
| | - Ian M Frayling
- Inherited Tumour Syndromes Research Group, Institute of Cancer & Genetics, School of Medicine, Cardiff University, Cardiff, UK
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Chen W, Pearlman R, Hampel H, Pritchard CC, Markow M, Arnold C, Knight D, Frankel WL. MSH6 immunohistochemical heterogeneity in colorectal cancer: comparative sequencing from different tumor areas. Hum Pathol 2019; 96:104-111. [PMID: 31783044 DOI: 10.1016/j.humpath.2019.11.003] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/01/2019] [Revised: 11/19/2019] [Accepted: 11/19/2019] [Indexed: 01/01/2023]
Abstract
Mismatch repair protein (MMR) immunohistochemistry is an important tool in screening for Lynch syndrome in colorectal cancer patients. Unusual staining patterns such as heterogeneous MSH6 staining have been reported in colorectal and endometrial cancers. We aim to better understand MSH6 staining heterogeneity in colorectal cancer by comparative sequencing of different tumor areas for MMR and DNA polymerase mutations. Whole-section slides of 1754 colorectal cancers were reviewed for heterogeneous MSH6 staining, defined as discrete tumor areas with abrupt loss of staining juxtaposed to tumor areas with retained staining. Nine cases (0.05%) demonstrated heterogeneous MSH6 staining; none received neoadjuvant therapy prior to the specimen collection. The area of tumor with loss of MSH6 expression ranged from 5% to 60% (average 22%). Four cases had enough tissue remaining in both retained and lost MSH6 areas to perform tumor sequencing on both areas. All 9 cases were negative for MSH6 germline mutation; MSH6 heterogeneous staining was seen in tumors with MLH1 or PMS2 abnormalities (6 cases of MLH1 methylation, 2 PMS2 germline mutation, 1 MLH1 germline mutation). In addition, case 1 also had a somatic POLD1 exonuclease domain mutation (p.Y405C) in the MSH6 loss area but not in the intact area. We recommend reporting MSH6 heterogeneous pattern as MSH6 staining is present with a comment stating that the heterogeneous pattern typically does not indicate germline mutation in MSH6 but is commonly associated with abnormality in another MMR gene such as MLH1 or PMS2, or even other DNA repair genes such as DNA polymerase.
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Affiliation(s)
- Wei Chen
- Department of Pathology, The Ohio State University Wexner Medical Center, Columbus, OH 43210
| | - Rachel Pearlman
- Department of Internal Medicine, The Ohio State University Wexner Medical Center, Columbus, OH 43210
| | - Heather Hampel
- Department of Internal Medicine, The Ohio State University Wexner Medical Center, Columbus, OH 43210
| | - Colin C Pritchard
- Department of Laboratory Medicine, University of Washington, Seattle, Washington WA 98195
| | - Michael Markow
- Department of Pathology, The Ohio State University Wexner Medical Center, Columbus, OH 43210
| | - Christina Arnold
- Department of Pathology, The Ohio State University Wexner Medical Center, Columbus, OH 43210
| | - Deborah Knight
- Department of Pathology, The Ohio State University Wexner Medical Center, Columbus, OH 43210
| | - Wendy L Frankel
- Department of Pathology, The Ohio State University Wexner Medical Center, Columbus, OH 43210.
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Mathews NS, Masih D, Mittal R, Perakath B, Sakthi D, Rebekah G, Pai R, Pulimood AB. Microsatellite instability in young patients with mucinous colorectal cancers - characterization using molecular testing, immunohistochemistry, and histological features. Indian J Cancer 2019; 56:309-314. [PMID: 31607698 DOI: 10.4103/ijc.ijc_224_18] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
CONTEXT The incidence of colorectal cancers (CRCs) in young Indian patients is higher than the international average. CRCs in young patients are commonly of mucinous type and show microsatellite instability (MSI). AIMS To ascertain the MSI status of mucinous CRCs in patients ≤40 years of age by molecular testing and to correlate this with immunohistochemical (IHC) analysis and tumor histology. SUBJECTS AND METHODS Archived formalin-fixed paraffin embedded tissue blocks of 30 young mucinous CRC patients were retrieved. MSI testing was done using two mononucleotide markers - BAT26 and NR24. IHC analysis was done using MLH1, MSH2, and MSH6. Histological features of all cases were studied. Data were analyzed using the SPSS software and the Pearson's chi-square test and Fisher's exact test. RESULTS Eight out of 30 cases (26.7%) showed MSI by molecular testing. IHC identified seven of these cases. Histological features showing a statistically significant association with MSI were the presence of a well-differentiated adenocarcinoma component (P = 0.003), peritumoral lymphocytes (P = 0.002) and tumor budding (P = 0.021). CONCLUSION The detection of defective mismatch repair (MMR) proteins using IHC for MLH1, MSH2, and MSH6 and molecular testing using BAT26 and NR24 appears to be a good protocol to detect CRCs with MSI. Histology could be useful in identifying cases that require screening for presence of MMR protein defects.
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Affiliation(s)
- Nitty Skariah Mathews
- Department of General Pathology, Christian Medical College, Vellore, Tamil Nadu, India
| | - Dipti Masih
- Department of General Pathology, Christian Medical College, Vellore, Tamil Nadu, India
| | - Rohin Mittal
- Department of Colorectal Surgery, Christian Medical College, Vellore, Tamil Nadu, India
| | - Benjamin Perakath
- Department of Colorectal Surgery, Christian Medical College, Vellore, Tamil Nadu, India
| | - Dhananjayan Sakthi
- Department of General Pathology, Christian Medical College, Vellore, Tamil Nadu, India
| | - Grace Rebekah
- Department of Biostatistics, Christian Medical College, Vellore, Tamil Nadu, India
| | - Rekha Pai
- Department of General Pathology, Christian Medical College, Vellore, Tamil Nadu, India
| | - Anna B Pulimood
- Department of General Pathology, Christian Medical College, Vellore, Tamil Nadu, India
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Zhang Q, Young GQ, Yang Z. Pure Discrete Punctate Nuclear Staining Pattern for MLH1 Protein Does Not Represent Intact Nuclear Expression. Int J Surg Pathol 2019; 28:146-152. [PMID: 31566049 DOI: 10.1177/1066896919878830] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Immunohistochemical staining for DNA mismatch repair (MMR) proteins is commonly used to screen for Lynch syndrome. Several laboratories have noticed a discrete punctate nuclear staining pattern for MLH1 that caused confusion in interpretation. This study was designed to investigate whether this particular staining pattern represents intact nuclear expression of MLH1. MMR proteins immunostaining and follow-up testing in 161 consecutive colorectal adenocarcinoma cases (86 biopsies, 75 resections) were retrospectively reviewed. Both discrete punctate nuclear staining and diffuse nuclear staining patterns for MLH1 were observed in internal control cells in 76 biopsies and 27 resections. Only diffuse nuclear staining was seen in the remaining 10 biopsies and 48 resections (P < .0001). Pure discrete punctate nuclear staining pattern for MLH1 was observed in 11 tumors (9 biopsies, 2 resections), and completely negative staining was seen in 13 tumors (2 biopsies, 11 resections; P = .003). Those 24 tumors (21 patients) invariably showed loss of PMS2. Three patients whose biopsies showed pure punctate staining for MLH1 underwent repeat testing on resections: 1 retained the punctate staining and 2 showed complete loss of MLH1. Nine patients who showed loss of PMS2 and pure punctate MLH1 staining underwent molecular testing: 4 had BRAF V600E mutations and 1 had MLH1 gene mutation. Our data showed that discrete punctate nuclear staining for MLH1 is more commonly seen in biopsy specimens. Pure discrete punctate staining pattern is paired with loss of PMS2 expression and may be associated with BRAF or MLH1 gene mutation, thus it should not be interpreted as intact nuclear expression.
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Affiliation(s)
- Qingzhao Zhang
- Penn State Health Milton S. Hershey Medical Center, Hershey, PA, USA
| | | | - Zhaohai Yang
- Penn State Health Milton S. Hershey Medical Center, Hershey, PA, USA
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Sun S, Liu Y, Eisfeld AK, Zhen F, Jin S, Gao W, Yu T, Chen L, Wang W, Chen W, Yuan M, Chen R, He K, Guo R. Identification of Germline Mismatch Repair Gene Mutations in Lung Cancer Patients With Paired Tumor-Normal Next Generation Sequencing: A Retrospective Study. Front Oncol 2019; 9:550. [PMID: 31297337 PMCID: PMC6607931 DOI: 10.3389/fonc.2019.00550] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2019] [Accepted: 06/05/2019] [Indexed: 01/09/2023] Open
Abstract
Background: Paired tumor-normal targeted next-generation sequencing (NGS) is primarily used to identify actionable somatic mutations, but can also detect germline variants including pathogenic germline mutations in DNA mismatch repair (MMR) genes that underlie Lynch syndrome. In the present study we examined paired NGS data from lung cancer patients to identify germline mutations in MMR genes. As lung cancer is not one of the recognized Lynch syndrome-associated neoplasms, we also investigated whether these lung cancer cases are due to Lynch syndrome or are instead sporadic cancers occurring in Lynch syndrome patients. Methods: A retrospective study of 1,179 lung cancer patients with available paired NGS data was performed to identify germline mutations in the MMR genes MLH1, MSH2, MSH6, and PMS2, and evaluate tumor mutation burden (TMB). Microsatellite instability (MSI) testing was done on select cases with MMR gene mutations by either NGS or PCR/capillary electrophoresis approach. Immunohistochemistry (IHC) for MMR proteins was performed in select patients. Results: Pathogenic or likely-pathogenic germline mutations in PMS2, MSH2, or MSH6 were detected in 0.5% (6/1,179) of lung cancer patients; three of the patients had a family history of colon or gastric cancer. The median age at diagnosis of these cases was 68.5 years old. None of these six patients exhibited MSI or loss of MMR protein expression. Among them, no second hit somatic mutations in MMR genes (including single-nucleotide variants, small insertions or deletions and copy number alterations) were detected, and the median TMB was 4.5 muts/MB. Subsequent genetic testing of family members identified new Lynch syndrome cases in two first-degree relatives. Conclusion: These data imply that lung cancers in Lynch syndrome patients are unrelated to the underlying Lynch syndrome diagnosis and occur spontaneously. Nonetheless, paired tumor-normal NGS can identify germline mutations to help reveal Lynch syndrome in cancer patients. This has important implications for cancer screening and risk reduction in these patients and their families.
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Affiliation(s)
- Sibo Sun
- Department of Oncology, The First Affiliated Hospital of Nanjing Medical University, Nanjing, China
| | - Yiqian Liu
- Department of Oncology, The First Affiliated Hospital of Nanjing Medical University, Nanjing, China
| | - Ann-Kathrin Eisfeld
- Departments of Internal Medicine and Pathology, The Ohio State University Wexner Medical Center, Columbus, OH, United States
| | - Fuxi Zhen
- Department of Cardiothoracic Surgery, The First Affiliated Hospital, Nanjing Medical University, Nanjing, China
| | - Shidai Jin
- Department of Oncology, The First Affiliated Hospital of Nanjing Medical University, Nanjing, China
| | - Wen Gao
- Department of Oncology, The First Affiliated Hospital of Nanjing Medical University, Nanjing, China
| | - Tongfu Yu
- Department of Radiology, The First Affiliated Hospital of Nanjing Medical University, Nanjing, China
| | - Liang Chen
- Department of Cardiothoracic Surgery, The First Affiliated Hospital, Nanjing Medical University, Nanjing, China
| | - Wei Wang
- Department of Thoracic Surgery, The First Affiliated Hospital of Nanjing Medical University, Nanjing, China
| | - Wei Chen
- Departments of Internal Medicine and Pathology, The Ohio State University Wexner Medical Center, Columbus, OH, United States
| | - Mingming Yuan
- Department of R&D, Geneplus-Beijing Institute, Beijing, China
| | - Rongrong Chen
- Department of R&D, Geneplus-Beijing Institute, Beijing, China
| | - Kai He
- Departments of Internal Medicine and Pathology, The Ohio State University Wexner Medical Center, Columbus, OH, United States
| | - Renhua Guo
- Department of Oncology, The First Affiliated Hospital of Nanjing Medical University, Nanjing, China
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Westwood A, Glover A, Hutchins G, Young C, Brockmoeller S, Robinson R, Worrilow L, Wallace D, Rankeillor K, Adlard J, Quirke P, West N. Additional loss of MSH2 and MSH6 expression in sporadic deficient mismatch repair colorectal cancer due to MLH1 promoter hypermethylation. J Clin Pathol 2019; 72:443-447. [PMID: 30723092 DOI: 10.1136/jclinpath-2018-205687] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2018] [Revised: 01/19/2019] [Accepted: 01/21/2019] [Indexed: 12/26/2022]
Abstract
Colorectal cancer (CRC) is common with 3% of cases associated with germline mutations in the mismatch repair pathway characteristic of Lynch syndrome (LS). The UK National Institute for Health and Care Excellence recommends screening for LS in all patients newly diagnosed with CRC, irrespective of age. The Yorkshire Cancer Research Bowel Cancer Improvement Programme includes a regional LS screening service for all new diagnoses of CRC. In the first 829 cases screened, 80 cases showed deficient mismatch repair (dMMR) including four cases showing areas with loss of expression of all four mismatch repair proteins by immunohistochemistry. The cases demonstrated diffuse MLH1 loss associated with BRAF mutations and MLH1 promoter hypermethylation in keeping with sporadic dMMR, with presumed additional double hit mutations in MSH2+/-MSH6 rather than underlying LS. Recognition and accurate interpretation of this unusual phenotype is important to prevent unnecessary referrals to clinical genetics and associated patient anxiety.
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Affiliation(s)
| | - Amy Glover
- Pathology, University of Leeds, Leeds, UK
| | | | | | | | - Rachel Robinson
- Genetics Laboratory, Leeds Teaching Hospitals NHS Trust, Leeds, UK
| | - Lisa Worrilow
- Genetics Laboratory, Leeds Teaching Hospitals NHS Trust, Leeds, UK
| | - Dave Wallace
- Genetics Laboratory, Leeds Teaching Hospitals NHS Trust, Leeds, UK
| | - Kate Rankeillor
- Genetics Laboratory, Leeds Teaching Hospitals NHS Trust, Leeds, UK
| | - Julian Adlard
- Genetics Laboratory, Leeds Teaching Hospitals NHS Trust, Leeds, UK
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Yozu M, Kumarasinghe MP, Brown IS, Gill AJ, Rosty C. Australasian Gastrointestinal Pathology Society (AGPS) consensus guidelines for universal defective mismatch repair testing in colorectal carcinoma. Pathology 2019; 51:233-239. [DOI: 10.1016/j.pathol.2018.11.014] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2018] [Revised: 11/18/2018] [Accepted: 11/25/2018] [Indexed: 01/28/2023]
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Salvador MU, Truelson MR, Mason C, Souders B, LaDuca H, Dougall B, Black MH, Fulk K, Profato J, Gutierrez S, Jasperson K, Tippin-Davis B, Lu HM, Gray P, Shah S, Chao EC, Ghahramani N, Landsverk M, Gau CL, Chen D, Pronold M. Comprehensive Paired Tumor/Germline Testing for Lynch Syndrome: Bringing Resolution to the Diagnostic Process. J Clin Oncol 2019; 37:647-657. [PMID: 30702970 PMCID: PMC6494248 DOI: 10.1200/jco.18.00696] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/12/2018] [Indexed: 12/11/2022] Open
Abstract
PURPOSE The current diagnostic testing algorithm for Lynch syndrome (LS) is complex and often involves multiple follow-up germline and somatic tests. We aimed to describe the results of paired tumor/germline testing performed on a large cohort of patients with colorectal cancer (CRC) and endometrial cancer (EC) to better determine the utility of this novel testing methodology. MATERIALS AND METHODS We retrospectively reviewed a consecutive series of patients with CRC and EC undergoing paired tumor/germline analysis of the LS genes at a clinical diagnostic laboratory (N = 702). Microsatellite instability, MLH1 promoter hypermethylation, and germline testing of additional genes were performed if ordered. Patients were assigned to one of five groups on the basis of prior tumor screening and germline testing outcomes. Results for each group are described. RESULTS Overall results were informative regarding an LS diagnosis for 76.1% and 60.8% of patients with mismatch-repair-deficient (MMRd) CRC and EC without and with prior germline testing, respectively. LS germline mutations were identified in 24.8% of patients in the group without prior germline testing, and interestingly, in 9.5% of patients with previous germline testing; four of these were discordant with prior tumor screening. Upon excluding patients with MLH1 promoter hypermethylation and germline mutations, biallelic somatic inactivation was seen in approximately 50% of patients with MMRd tumors across groups. CONCLUSION Paired testing identified a cause for MMRd tumors in 76% and 61% of patients without and with prior LS germline testing, respectively. Findings support inclusion of tumor sequencing as well as comprehensive LS germline testing in the LS testing algorithm. Paired testing offers a complete, convenient evaluation for LS with high diagnostic resolution.
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Affiliation(s)
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | - Elizabeth C. Chao
- Ambry Genetics, Aliso Viejo, CA
- University of California, Irvine, School of Medicine, Irvine, CA
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A practical guide to biomarkers for the evaluation of colorectal cancer. Mod Pathol 2019; 32:1-15. [PMID: 30600322 DOI: 10.1038/s41379-018-0136-1] [Citation(s) in RCA: 52] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2018] [Accepted: 07/23/2018] [Indexed: 12/12/2022]
Abstract
Evaluation of microsatellite instability (MSI) of every colorectal cancer (CRC) is important for prognostic and therapeutic purposes, while molecular testing helps identify actionable targeted therapy for patients with metastatic disease. This review will discuss the biomarkers commonly encountered in the clinical evaluation of CRC, and practical issues regarding MSI screening, reporting, interpretation, molecular test indication, and specimen requirements.
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Jang M, Kwon Y, Kim H, Kim H, Min BS, Park Y, Kim TI, Hong SP, Kim WK. Microsatellite instability test using peptide nucleic acid probe-mediated melting point analysis: a comparison study. BMC Cancer 2018; 18:1218. [PMID: 30514259 PMCID: PMC6280403 DOI: 10.1186/s12885-018-5127-6] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2018] [Accepted: 11/23/2018] [Indexed: 02/07/2023] Open
Abstract
Background Analysis of high microsatellite instability (MSI-H) phenotype in colorectal carcinoma (CRC) is important for evaluating prognosis and choosing a proper adjuvant therapy. Although the conventional MSI analysis methods such as polymerase chain reaction (PCR) fragment analysis and immunohistochemistry (IHC) show high specificity and sensitivity, there are substantial barriers to their use. Methods In this study, we analyzed the MSI detection performance of three molecular tests and IHC. For the molecular tests, we included a recently developed peptide nucleic acid probe (PNA)-mediated real-time PCR-based method using five quasi-monomorphic mononucleotide repeat markers (PNA method) and two conventional PCR fragment analysis methods using NCI markers (NCI method) or five quasi-monomorphic mononucleotide repeat markers (MNR method). IHC analysis was performed with four mismatch repair proteins. The performance of each method was validated in 166 CRC patient samples, which consisted of 76 MSI-H and 90 microsatellite stable (MSS) CRCs previously diagnosed by NCI method. Results Of the 166 CRCs, 76 MSI-H and 90 MSS CRCs were determined by PNA method. On the other hand, 75 MSI-H and 91 MSS CRCs were commonly determined by IHC and MNR methods. Based on the originally diagnosed MSI status, PNA showed 100% sensitivity and 100% specificity while IHC and MNR showed 98.68% sensitivity and 100% specificity. When we analyzed the maximum sensitivity of MNR and PNA method, which used the same five markers, PNA method could detect alterations in all five mononucleotide repeat markers in samples containing down to 5% MSI-H DNAs, whereas MNR required at least 20% MSI-H DNAs to achieve the same performance. Conclusions Based on these findings, we suggest that PNA method can be used as a practical laboratory test for the diagnosis of MSI. Electronic supplementary material The online version of this article (10.1186/s12885-018-5127-6) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Mi Jang
- Department of Pathology, Yonsei University College of Medicine, 50 Yonsei-ro, Seodaemun-gu, Seoul, 120-752, South Korea
| | - Yujin Kwon
- Department of Pathology, Yonsei University College of Medicine, 50 Yonsei-ro, Seodaemun-gu, Seoul, 120-752, South Korea.,Brain Korea 21 PLUS Projects for Medical Science, Yonsei University College of Medicine, 50 Yonsei-ro, Seodaemun-gu, Seoul, 120-752, South Korea
| | - Hoguen Kim
- Department of Pathology, Yonsei University College of Medicine, 50 Yonsei-ro, Seodaemun-gu, Seoul, 120-752, South Korea.,Brain Korea 21 PLUS Projects for Medical Science, Yonsei University College of Medicine, 50 Yonsei-ro, Seodaemun-gu, Seoul, 120-752, South Korea
| | - Hyunki Kim
- Department of Pathology, Yonsei University College of Medicine, 50 Yonsei-ro, Seodaemun-gu, Seoul, 120-752, South Korea
| | - Byung Soh Min
- Department of Surgery, Yonsei University College of Medicine, Seoul, 120-752, South Korea
| | - Yehyun Park
- Department of Internal Medicine, Institute of Gastroenterology, Yonsei University College of Medicine, Seoul, 120-752, South Korea
| | - Tae Il Kim
- Department of Internal Medicine, Institute of Gastroenterology, Yonsei University College of Medicine, Seoul, 120-752, South Korea
| | - Sung Pil Hong
- Department of Surgery and Cancer, Imperial College London, London, W120NN, UK
| | - Won Kyu Kim
- Department of Pathology, Yonsei University College of Medicine, 50 Yonsei-ro, Seodaemun-gu, Seoul, 120-752, South Korea. .,Brain Korea 21 PLUS Projects for Medical Science, Yonsei University College of Medicine, 50 Yonsei-ro, Seodaemun-gu, Seoul, 120-752, South Korea.
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Two-stain immunohistochemical screening for Lynch syndrome in colorectal cancer may fail to detect mismatch repair deficiency. Mod Pathol 2018; 31:1891-1900. [PMID: 29967423 PMCID: PMC6800091 DOI: 10.1038/s41379-018-0058-y] [Citation(s) in RCA: 43] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2017] [Revised: 03/06/2018] [Accepted: 03/07/2018] [Indexed: 02/07/2023]
Abstract
Universal screening for Lynch syndrome in colorectal cancer is recommended, and immunohistochemistry for the mismatch repair proteins is commonly used. To reduce cost, some screen using only MSH6 and PMS2, with reflex to the partner stain if either are absent (two-stain method). An expression pattern revealing absent MSH2 and intact MSH6 is not expected, but could result in failed Lynch syndrome detection. We analyzed tumors with absent MSH2 but any degree of MSH6 expression to determine if the two-stain method could miss MSH2 mutations. One-thousand seven-hundred thirty colorectal cancer patients from the Ohio Colorectal Cancer Prevention Initiative underwent tumor screening using microsatellite instability and immunohistochemistry. The two-stain method was used for 1235 cases; staining for all four proteins was completed for 495 cases. The proportion of positive cells and staining intensity were reviewed for MSH6, as well as MSH2 when available. Patients with mismatch repair deficiency underwent next-generation sequencing of germline DNA for mismatch repair genes. If negative, tumor next-generation sequencing was performed to assess for somatic mutations. Overall, thirty-three (1.9%, 33/1730) MSH2-absent cases were identified. Of those, fourteen had no MSH6 expression but eight (0.5%, 8/1730) had ambiguous and eleven (0.6%, 11/1730) had convincing MSH6 expression that could have been interpreted as intact. Germline next-generation sequencing identified MSH2 mutations in 11/14 cases with absence of both stains, 7/8 cases with ambiguous MSH6 expression, and 9/11 cases with convincing MSH6 expression. All remaining cases, except one, had double somatic mutations. The two-stain method fails to detect some patients with Lynch syndrome: (1) significant staining weaker than the control may be incorrectly interpreted as intact MSH6, or (2) Weak or focal/patchy MSH6 can be retained with the absence of MSH2. Accordingly, we recommend the four-stain method be used for optimal Lynch syndrome screening detection.
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Ishida H, Yamaguchi T, Tanakaya K, Akagi K, Inoue Y, Kumamoto K, Shimodaira H, Sekine S, Tanaka T, Chino A, Tomita N, Nakajima T, Hasegawa H, Hinoi T, Hirasawa A, Miyakura Y, Murakami Y, Muro K, Ajioka Y, Hashiguchi Y, Ito Y, Saito Y, Hamaguchi T, Ishiguro M, Ishihara S, Kanemitsu Y, Kawano H, Kinugasa Y, Kokudo N, Murofushi K, Nakajima T, Oka S, Sakai Y, Tsuji A, Uehara K, Ueno H, Yamazaki K, Yoshida M, Yoshino T, Boku N, Fujimori T, Itabashi M, Koinuma N, Morita T, Nishimura G, Sakata Y, Shimada Y, Takahashi K, Tanaka S, Tsuruta O, Yamaguchi T, Sugihara K, Watanabe T. Japanese Society for Cancer of the Colon and Rectum (JSCCR) Guidelines 2016 for the Clinical Practice of Hereditary Colorectal Cancer (Translated Version). J Anus Rectum Colon 2018; 2:S1-S51. [PMID: 31773066 PMCID: PMC6849642 DOI: 10.23922/jarc.2017-028] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/26/2017] [Accepted: 09/15/2017] [Indexed: 02/07/2023] Open
Abstract
Hereditary colorectal cancer accounts for less than 5% of all colorectal cancer cases. Some of the unique characteristics that are commonly encountered in cases of hereditary colorectal cancer include early age at onset, synchronous/metachronous occurrence of the cancer, and association with multiple cancers in other organs, necessitating different management from sporadic colorectal cancer. While the diagnosis of familial adenomatous polyposis might be easy because usually 100 or more adenomas that develop in the colonic mucosa are in this condition, Lynch syndrome, which is the most commonly associated disease with hereditary colorectal cancer, is often missed in daily medical practice because of its relatively poorly defined clinical characteristics. In addition, the disease concept and diagnostic criteria for Lynch syndrome, which was once called hereditary non-polyposis colorectal cancer, have changed over time with continual research, thereby possibly creating confusion in clinical practice. Under these circumstances, the JSCCR Guideline Committee has developed the "JSCCR Guidelines 2016 for the Clinical Practice of Hereditary Colorectal Cancer (HCRC)," to allow delivery of appropriate medical care in daily practice to patients with familial adenomatous polyposis, Lynch syndrome, or other related diseases. The JSCCR Guidelines 2016 for HCRC were prepared by consensus reached among members of the JSCCR Guideline Committee, based on a careful review of the evidence retrieved from literature searches, and considering the medical health insurance system and actual clinical practice settings in Japan. Herein, we present the English version of the JSCCR Guidelines 2016 for HCRC.
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Affiliation(s)
- Hideyuki Ishida
- Department of Digestive Tract and General Surgery, Saitama Medical Center, Saitma Medical University, Kawagoe, Japan
| | - Tatsuro Yamaguchi
- Department of Surgery, Tokyo Metropolitan Cancer and Infectious Diseases Center Komagome Hospital, Tokyo, Japan
| | - Kohji Tanakaya
- Department of Surgery, Iwakuni Clinical Center, Iwakuni, Japan
| | - Kiwamu Akagi
- Department of Cancer Prevention and Molecular Genetics, Saitama Prefectural Cancer Center, Saitama, Japan
| | - Yasuhiro Inoue
- Department of Gastrointestinal and Pediatric Surgery, Division of Reparative Medicine, Institute of Life Sciences, Mie University Graduate School of Medicine, Tsu, Japan
| | - Kensuke Kumamoto
- Department of Coloproctology, Aizu Medical Center, Fukushima Medical University, Aizuwakamatsu, Japan
| | - Hideki Shimodaira
- Department of Clinical Oncology, Institute of Development, Aging and Cancer, Tohoku University, Sendai, Japan
| | - Shigeki Sekine
- Division of Pathology and Clinical Laboratories, National Cancer Center, Hospital, Tokyo, Japan
| | - Toshiaki Tanaka
- Department of Surgical Oncology, The Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
| | - Akiko Chino
- Division of Gastroenterology, The Cancer Institute Hospital, Japanese Foundation for Cancer Research, Tokyo, Japan
| | - Naohiro Tomita
- Department of Surgery, Hyogo College of Medicine, Nishinomiya, Japan
| | - Takeshi Nakajima
- Endoscopy Division/Department of Genetic Medicine and Service, National Cancer Center Hospital, Tokyo, Japan
| | | | - Takao Hinoi
- Department of Surgery, Institute for Clinical Research, National Hospital Organization Kure Medical Center and Chugoku Cancer Center, Kure, Japan
| | - Akira Hirasawa
- Department of Obstetrics and Gynecology, Keio University School of Medicine, Tokyo, Japan
| | - Yasuyuki Miyakura
- Department of Surgery Saitama Medical Center, Jichi Medical University, Saitama, Japan
| | - Yoshie Murakami
- Department of Oncology Nursing, Faculty of Nursing, Toho University, Tokyo, Japan
| | - Kei Muro
- Department of Clinical Oncology, Aichi Cancer Center Hospital, Nagoya, Japan
| | - Yoichi Ajioka
- Division of Molecular and Diagnostic Pathology, Graduate School of Medical and Dental Sciences, Niigata University, Niigata, Japan
| | | | - Yoshinori Ito
- Department of Radiation Oncology, National Cancer Center Hospital, Tokyo, Japan
| | - Yutaka Saito
- Endoscopy Division, National Cancer Center Hospital, Tokyo, Japan
| | - Tetsuya Hamaguchi
- Division of Gastrointestinal Medical Oncology, National Cancer Center Hospital, Tokyo, Japan
| | - Megumi Ishiguro
- Department of Translational Oncology, Tokyo Medical and Dental University Graduate School, Tokyo, Japan
| | - Soichiro Ishihara
- Department of Surgical Oncology, The Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
| | - Yukihide Kanemitsu
- Colorectal Surgery Division, National Cancer Center Hospital, Tokyo, Japan
| | - Hiroshi Kawano
- Department of Gastroenterology, St. Mary's Hospital, Fukuoka, Japan
| | - Yusuke Kinugasa
- Department of Colon and Rectal Surgery, Shizuoka Cancer Center, Shizuoka, Japan
| | - Norihiro Kokudo
- Hepato-Pancreato-Biliary Surgery Division, Artificial Organ and Transplantation Division, Department of Surgery, Graduate School of Medicine, University of Tokyo, Tokyo, Japan
| | - Keiko Murofushi
- Radiation Oncology Department, The Cancer Institute Hospital, Japanese Foundation for Cancer Research, Tokyo, Japan
| | - Takako Nakajima
- Department of Clinical Oncology, St. Marianna University School of Medicine, Kawasaki, Japan
| | - Shiro Oka
- Gastroenterology and Metabolism, Hiroshima University Hospital, Hiroshima, Japan
| | | | - Akihiko Tsuji
- Department of Clinical Oncology, Faculty of Medicine, Kagawa University, Takamatsu, Japan
| | - Keisuke Uehara
- Division of Surgical Oncology, Department of Surgery, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - Hideki Ueno
- Department of Surgery, National Defense Medical College, Saitama, Japan
| | - Kentaro Yamazaki
- Division of Gastrointestinal Oncology, Shizuoka Cancer Center, Shizuoka, Japan
| | - Masahiro Yoshida
- Department of Hemodialysis and Surgery, Chemotherapy Research Institute, International University of Health and Welfare, Ichikawa, Japan
| | - Takayuki Yoshino
- Department of Gastroenterology and Gastrointestinal Oncology, National Cancer Center Hospital East, Chiba, Japan
| | - Narikazu Boku
- Division of Gastrointestinal Medical Oncology, National Cancer Center Hospital, Tokyo, Japan
| | | | - Michio Itabashi
- Department of Surgery, Institute of Gastroenterology, Tokyo Women's Medical University, Tokyo, Japan
| | - Nobuo Koinuma
- Department of Health Administration and Policy, Tohoku Medical and Pharmaceutical University, Sendai, Japan
| | - Takayuki Morita
- Department of Surgery, Cancer Center, Aomori Prefectural Central Hospital, Aomori, Japan
| | - Genichi Nishimura
- Department of Surgery, Japanese Red Cross Kanazawa Hospital, Ishikawa, Japan
| | - Yuh Sakata
- CEO, Misawa City Hospital, Misawa, Japan
| | - Yasuhiro Shimada
- Division of Clinical Oncology, Kochi Health Sciences Center, Kochi, Japan
| | - Keiichi Takahashi
- Department of Surgery, Tokyo Metropolitan Cancer and Infectious Diseases Center Komagome Hospital, Tokyo, Japan
| | - Shinji Tanaka
- Department of Endoscopy, Hiroshima University Hospital, Hiroshima, Japan
| | - Osamu Tsuruta
- Division of GI Endoscopy, Kurume University School of Medicine, Fukuoka, Japan
| | - Toshiharu Yamaguchi
- Department of Gastroenterological Surgery, The Cancer Institute Hospital, Japanese Foundation for Cancer Research, Tokyo, Japan
| | | | - Toshiaki Watanabe
- Department of Surgical Oncology, The Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
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47
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Westenend PJ, Dinjens WN. Somatic polymerase epsilon mutations as another route leading to loss of DNA MMR protein expression in endometrial carcinoma. Hum Pathol 2018; 76:169. [PMID: 29634980 DOI: 10.1016/j.humpath.2018.01.028] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/25/2017] [Accepted: 01/11/2018] [Indexed: 11/24/2022]
Affiliation(s)
| | - Winand N Dinjens
- Pathology Department, Erasmus MC, Josephine Nefkens Institute, Rotterdam 3000, DR, Netherlands
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48
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Wang T, Stadler ZK, Zhang L, Weiser MR, Basturk O, Hechtman JF, Vakiani E, Saltz LB, Klimstra DS, Shia J. Immunohistochemical null-phenotype for mismatch repair proteins in colonic carcinoma associated with concurrent MLH1 hypermethylation and MSH2 somatic mutations. Fam Cancer 2018; 17:225-228. [PMID: 28819720 PMCID: PMC5908711 DOI: 10.1007/s10689-017-0031-9] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Microsatellite instability, a well-established driver pathway in colorectal carcinogenesis, can develop in both sporadic and hereditary conditions via different molecular alterations in the DNA mismatch repair (MMR) genes. MMR protein immunohistochemistry (IHC) is currently widely used for the detection of MMR deficiency in solid tumors. The IHC test, however, can show varied staining patterns, posing challenges in the interpretation of the staining results in some cases. Here we report a case of an 80-year-old female with a colonic adenocarcinoma that exhibited an unusual "null" IHC staining pattern with complete loss of all four MMR proteins (MLH1, MSH2, MSH6, and PMS2). This led to subsequent MLH1 methylation testing and next generation sequencing which demonstrated that the loss of all MMR proteins was associated with concurrent promoter hypermethylation of MLH1 and double somatic truncating mutations in MSH2. These molecular findings, in conjunction with the patient's age being 80 years and the fact that the patient had no personal or family cancer history, indicated that the MMR deficiency was highly likely sporadic in nature. Thus, the stringent Lynch syndrome type surveillance programs were not recommended to the patient and her family members. This case illustrates a rare but important scenario where a null IHC phenotype signifies complex underlying molecular alternations that bear clinical management implications, highlighting the need for recognition and awareness of such unusual IHC staining patterns.
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Affiliation(s)
- Tao Wang
- Department of Pathology, Memorial Sloan Kettering Cancer Center, 1275 York Ave., New York, NY, USA
| | - Zsofia K Stadler
- Department of Medicine, Memorial Sloan Kettering Cancer Center, New York, NY, USA
| | - Liying Zhang
- Department of Pathology, Memorial Sloan Kettering Cancer Center, 1275 York Ave., New York, NY, USA
| | - Martin R Weiser
- Department of Surgery, Memorial Sloan Kettering Cancer Center, New York, NY, USA
| | - Olca Basturk
- Department of Pathology, Memorial Sloan Kettering Cancer Center, 1275 York Ave., New York, NY, USA
| | - Jaclyn F Hechtman
- Department of Pathology, Memorial Sloan Kettering Cancer Center, 1275 York Ave., New York, NY, USA
| | - Efsevia Vakiani
- Department of Pathology, Memorial Sloan Kettering Cancer Center, 1275 York Ave., New York, NY, USA
| | - Lenard B Saltz
- Department of Medicine, Memorial Sloan Kettering Cancer Center, New York, NY, USA
| | - David S Klimstra
- Department of Pathology, Memorial Sloan Kettering Cancer Center, 1275 York Ave., New York, NY, USA
| | - Jinru Shia
- Department of Pathology, Memorial Sloan Kettering Cancer Center, 1275 York Ave., New York, NY, USA.
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Bartosch C, Clarke B, Bosse T. Gynaecological neoplasms in common familial syndromes (Lynch and HBOC). Pathology 2017; 50:222-237. [PMID: 29287922 DOI: 10.1016/j.pathol.2017.10.010] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2017] [Revised: 10/16/2017] [Accepted: 10/17/2017] [Indexed: 12/22/2022]
Abstract
Recognising hereditary predisposition in a cancer patient has implications both for the patient and the patient's kindred. For the latter, cascade germline testing can reassure those not-at-risk family members while carriers can be enrolled in cancer screening and prevention programs that are medically effective and economically sustainable for health care systems. Furthermore, in many of these syndromes, ramifications of molecular phenotypes are increasing, and it is now emerging that, in addition, they convey prognostic and predictive information. Although cancer predisposition syndromes are rare, these molecular phenotypes also occur as somatic events in sporadic cancer settings. The information obtained from these molecular phenotypes, regardless of germline or somatic origin, is being incorporated into clinical management in view of their manifold significance. Thus, increasingly, bespoke management of cancer patients involves testing for both germline and somatic mutations in tumours. Lynch syndrome and BRCA-1 and BRCA-2-associated hereditary breast and ovarian cancer are hereditary cancer syndromes frequently involving the gynaecological tract but tumours associated with similar molecular alterations may also occur sporadically. Thus, the molecular phenotype of mismatch repair deficiency, microsatellite instability or hypermutator phenotype may be attributable to germline or somatic events. Similarly, homologous recombination deficiency or 'BRCAness' in ovarian cancers may be syndromic or sporadic. While hereditary syndromes are well recognised, the prognostic and predictive implications of these molecular phenotypes have only recently been elucidated and these aspects will finally ensure that molecular screening may become standard of care. Thus, nowadays pathologists are asked to designate the molecular phenotype of these cancers and then determine whether it is due to hereditary or sporadic causes.
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Affiliation(s)
- Carla Bartosch
- Department of Pathology, Portuguese Oncology Institute of Porto (IPO-Porto), Porto, Portugal
| | - Blaise Clarke
- Department of Laboratory Medicine and Pathobiology, University of Toronto, University Health Network, Toronto, Ontario, Canada
| | - Tjalling Bosse
- Department of Pathology, Leiden University Medical Center, The Netherlands.
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50
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Markow M, Chen W, Frankel WL. Immunohistochemical Pitfalls: Common Mistakes in the Evaluation of Lynch Syndrome. Surg Pathol Clin 2017; 10:977-1007. [PMID: 29103543 DOI: 10.1016/j.path.2017.07.012] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
At least 15% of colorectal cancers diagnosed in the United States are deficient in mismatch repair mechanisms. Most of these are sporadic, but approximately 3% of colorectal cancers result from germline alterations in mismatch repair genes and represent Lynch syndrome. It is critical to identify patients with Lynch syndrome to institute appropriate screening and surveillance for patients and their families. Exclusion of Lynch syndrome in sporadic cases is equally important because it reduces anxiety for patients and prevents excessive spending on unnecessary surveillance. Immunohistochemistry is one of the most widely used screening tools for identifying patients with Lynch syndrome.
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Affiliation(s)
- Michael Markow
- Department of Pathology, The Ohio State University Wexner Medical Center, 129 Hamilton Hall, 1645 Neil Avenue, Columbus, OH 43210, USA
| | - Wei Chen
- Department of Pathology, The Ohio State University Wexner Medical Center, 129 Hamilton Hall, 1645 Neil Avenue, Columbus, OH 43210, USA
| | - Wendy L Frankel
- Department of Pathology, The Ohio State University Wexner Medical Center, 129 Hamilton Hall, 1645 Neil Avenue, Columbus, OH 43210, USA.
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