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Griffith BD, Lazarus J, McGue J, Krishnan S, D’Angelica MI, Shia J, Dobrosotskaya I, Shi J, Edwards J, Rao A, Frankel TL. Unique characteristics of the tumor immune microenvironment in young patients with metastatic colorectal cancer. Front Immunol 2023; 14:1289402. [PMID: 38152402 PMCID: PMC10751347 DOI: 10.3389/fimmu.2023.1289402] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2023] [Accepted: 11/17/2023] [Indexed: 12/29/2023] Open
Abstract
Introduction Metastatic colorectal cancer (mCRC) remains a common and highly morbid disease, with a recent increase in incidence in patients younger than 50 years. There is an acute need to better understand differences in tumor biology, molecular characteristics, and other age-related differences in the tumor microenvironment (TME). Methods 111 patients undergoing curative-intent resection of colorectal liver metastases were stratified by age into those <50 years or >65 years old, and tumors were subjected to multiplex fluorescent immunohistochemistry (mfIHC) to characterize immune infiltration and cellular engagement. Results There was no difference in infiltration or proportion of immune cells based upon age, but the younger cohort had a higher proportion of programmed death-ligand 1 (PD-L1)+ expressing antigen presenting cells (APCs) and demonstrated decreased intercellular distance and increased cellular engagement between tumor cells (TCs) and cytotoxic T lymphocytes (CTLs), and between TCs and APCs. These trends were independent of microsatellite instability in tumors. Discussion Age-related differences in PD-L1 expression and cellular engagement in the tumor microenvironment of patients with mCRC, findings which were unrelated to microsatellite status, suggest a more active immune microenvironment in younger patients that may offer an opportunity for therapeutic intervention with immune based therapy.
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Affiliation(s)
- Brian D. Griffith
- Department of Surgery, University of Michigan, Ann Arbor, MI, United States
| | - Jenny Lazarus
- Department of Surgery, University of Michigan, Ann Arbor, MI, United States
| | - Jake McGue
- Department of Surgery, University of Michigan, Ann Arbor, MI, United States
| | - Santhoshi Krishnan
- Department of Computational Medicine and Bioinformatics, University of Michigan, Ann Arbor, MI, United States
- Department of Electrical and Computer Engineering, Rice University, Houston, TX, United States
| | - Michael I. D’Angelica
- Department of Surgery, Memorial Sloan Kettering Cancer Center, New York, NY, United States
| | - Jinru Shia
- Department of Pathology, Memorial Sloan Kettering Cancer Center, New York, NY, United States
| | - Irina Dobrosotskaya
- Division of Hematology and Oncology, Department of Medicine, University of Michigan, Ann Arbor, MI, United States
| | - Jaiqi Shi
- Department of Radiation Oncology, University of Michigan, Ann Arbor, MI, United States
| | - Jacob Edwards
- Department of Surgery, University of Michigan, Ann Arbor, MI, United States
| | - Arvind Rao
- Department of Computational Medicine and Bioinformatics, University of Michigan, Ann Arbor, MI, United States
- Department of Electrical and Computer Engineering, Rice University, Houston, TX, United States
- Department of Radiation Oncology, University of Michigan, Ann Arbor, MI, United States
- Department of Biomedical Engineering, University of Michigan, Ann Arbor, MI, United States
- Department of Biostatistics, University of Michigan, Ann Arbor, MI, United States
| | - Timothy L. Frankel
- Department of Surgery, University of Michigan, Ann Arbor, MI, United States
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Gao C, Zhou G, Cheng M, Feng L, Cao P, Zhou G. Identification of senescence-associated long non-coding RNAs to predict prognosis and immune microenvironment in patients with hepatocellular carcinoma. Front Genet 2022; 13:956094. [PMID: 36330438 PMCID: PMC9624069 DOI: 10.3389/fgene.2022.956094] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2022] [Accepted: 09/30/2022] [Indexed: 02/17/2024] Open
Abstract
Background: Cellular senescence plays a complicated and vital role in cancer development because of its divergent effects on tumorigenicity. However, the long non-coding RNAs (lncRNAs) associated with tumor senescence and their prognostic value in hepatocellular carcinoma (HCC) remain unexplored. Methods: The trans-cancer oncogene-induced senescence (OIS) signature was determined by gene set variation analysis (GSVA) in the cancer genome atlas (TCGA) dataset. The OIS-related lncRNAs were identified by correlation analyses. Cox regression analyses were used to screen lncRNAs associated with prognosis, and an optimal predictive model was created by regression analysis of the least absolute shrinkage and selection operator (LASSO). The performance of the model was evaluated by Kaplan-Meier survival analyses, nomograms, stratified survival analyses, and receiver operating characteristic curve (ROC) analyses. Gene set enrichment analysis (GSEA) and cell-type identification by estimating relative subsets of RNA transcripts (CIBERSORT) were carried out to explore the functional relevance and immune cell infiltration, respectively. Results: Firstly, we examined the pan-cancer OIS signature, and found several types of cancer with OIS strongly associated with the survival of patients, including HCC. Subsequently, based on the OIS signature, we identified 76 OIS-related lncRNAs with prognostic values in HCC. We then established an optimal prognostic model based on 11 (including NRAV, AC015908.3, MIR100HG, AL365203.2, AC009005.1, SNHG3, LINC01138, AC090192.2, AC008622.2, AL139423.1, and AC026356.1) of these lncRNAs by LASSO-Cox regression analysis. It was then confirmed that the risk score was an independent and potential risk indicator for overall survival (OS) (HR [95% CI] = 4.90 [2.74-8.70], p < 0.001), which outperforms those traditional clinicopathological factors. Furthermore, patients with higher risk scores also showed more advanced levels of a proinflammatory senescence-associated secretory phenotype (SASP), higher infiltration of regulatory T (Treg) cells and lower infiltration of naïve B cells, suggesting the regulatory effects of OIS on immune microenvironment. Additionally, we identified NRAV as a representative OIS-related lncRNA, which is over-expressed in HCC tumors mainly driven by DNA hypomethylation. Conclusion: Based on 11 OIS-related lncRNAs, we established a promising prognostic predictor for HCC patients, and highlighted the potential immune microenvironment-modulatory roles of OIS in HCC, providing a broad molecular perspective of tumor senescence.
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Affiliation(s)
- Chengzhi Gao
- State Key Laboratory of Proteomics, National Center for Protein Sciences at Beijing, Beijing Institute of Radiation Medicine, Beijing, China
| | - Guangming Zhou
- State Key Laboratory of Proteomics, National Center for Protein Sciences at Beijing, Beijing Institute of Radiation Medicine, Beijing, China
| | - Min Cheng
- Collaborative Innovation Center for Personalized Cancer Medicine, Center for Global Health, School of Public Health, Nanjing Medical University, Nanjing, China
| | - Lan Feng
- State Key Laboratory of Proteomics, National Center for Protein Sciences at Beijing, Beijing Institute of Radiation Medicine, Beijing, China
| | - Pengbo Cao
- State Key Laboratory of Proteomics, National Center for Protein Sciences at Beijing, Beijing Institute of Radiation Medicine, Beijing, China
| | - Gangqiao Zhou
- State Key Laboratory of Proteomics, National Center for Protein Sciences at Beijing, Beijing Institute of Radiation Medicine, Beijing, China
- Collaborative Innovation Center for Personalized Cancer Medicine, Center for Global Health, School of Public Health, Nanjing Medical University, Nanjing, China
- Hebei University, Baoding, China
- Anhui Medical University, Hefei, China
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Schell D, Ullah S, Brooke-Smith ME, Hollington P, Yeow M, Karapetis CS, Watson DI, Pandol SJ, Roberts CT, Barreto SG. Gastrointestinal Adenocarcinoma Incidence and Survival Trends in South Australia, 1990-2017. Cancers (Basel) 2022; 14:cancers14020275. [PMID: 35053439 PMCID: PMC8773524 DOI: 10.3390/cancers14020275] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2021] [Revised: 12/27/2021] [Accepted: 01/05/2022] [Indexed: 02/06/2023] Open
Abstract
Simple Summary This study from South Australia using the state’s Cancer Registry data provides compelling evidence for a significant increase in the incidence of young-onset (18–50 years) gastrointestinal (oesophageal, stomach, colon and rectum, and pancreas) adenocarcinomas over the last three decades. The trend observed in the young cohort was not mirrored in older individuals >50 years. This increased incidence, though noted in both sexes, was more pronounced in males compared to females. Survival in the young-onset adenocarcinoma cohort was only seen in patients with colorectal cancers, but not oesophagus, stomach and pancreas. This study calls for a concerted effort aimed at determining the sociodemographic factors underlying this disturbing trend with the aim of developing preventative strategies. Abstract Background & Aims: Globally, there has been a concerning rise in the incidence of young-onset cancers. The aim of this study was to provide trends in the incidence and survival of gastrointestinal adenocarcinomas (oesophagus, stomach, pancreas, and colorectal) in South Australia over a 27-year period. Methods: This is a cross-sectional analysis of a prospective longitudinal database including all cases of gastrointestinal adenocarcinomas prospectively reported to the South Australian (State) Cancer Registry from 1990 to 2017. Results: A total of 28,566 patients diagnosed with oesophageal, stomach, pancreatic, or colorectal adenocarcinoma between 1990 and 2017 were included in the study. While the overall incidence for gastrointestinal adenocarcinomas in individuals >50 years has decreased since 2000 (IRR of 0.97 (95% CI 0.94–1.00; p = 0.06)) compared to 1990–1999, the rate amongst individuals aged 18–50 has significantly increased (IRR 1.41 (95% CI 1.27–1.57; p < 0.001)) during the same reference time period. Although noted in both sexes, the rate of increase in incidence was significantly greater in males (11.5 to 19.7/100,000; p < 0.001). The overall survival from adenocarcinomas across all subsites improved in the >50-year cohort in the last decade (HR 0.89 (95% CI 0.86–0.93; p < 0.001)) compared to 1990–1999. In individuals aged 18–50 years, there has only been a significant improvement in survival for colorectal cancer (HR 0.82 (95% CI 0.68–0.99; p < 0.04)), but not the other subsites. A lower overall survival was noted for males in both age cohorts (18–50 years—HR 1.24 (95% CI 1.09–1.13; p < 0.01) and >50 years—HR 1.13 (95% CI 1.10–1.16; p < 0.001), respectively) compared to females. Conclusions: This study from South Australia demonstrates a significant increase in young-onset gastrointestinal adenocarcinomas over the last 28 years, with a greater increase in the male sex. The only significant improvement in survival in this cohort has been noted in colorectal cancer patients.
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Affiliation(s)
- Dominique Schell
- College of Medicine and Public Health, Flinders University, Adelaide, SA 5042, Australia; (D.S.); (S.U.); (P.H.); (C.S.K.); (D.I.W.)
| | - Shahid Ullah
- College of Medicine and Public Health, Flinders University, Adelaide, SA 5042, Australia; (D.S.); (S.U.); (P.H.); (C.S.K.); (D.I.W.)
| | - Mark E. Brooke-Smith
- Flinders Medical Center, Division of Surgery and Perioperative Medicine, Flinders University, Adelaide, SA 5042, Australia; (M.E.B.-S.); (M.Y.)
| | - Paul Hollington
- College of Medicine and Public Health, Flinders University, Adelaide, SA 5042, Australia; (D.S.); (S.U.); (P.H.); (C.S.K.); (D.I.W.)
- Flinders Medical Center, Division of Surgery and Perioperative Medicine, Flinders University, Adelaide, SA 5042, Australia; (M.E.B.-S.); (M.Y.)
| | - Marina Yeow
- Flinders Medical Center, Division of Surgery and Perioperative Medicine, Flinders University, Adelaide, SA 5042, Australia; (M.E.B.-S.); (M.Y.)
| | - Christos S. Karapetis
- College of Medicine and Public Health, Flinders University, Adelaide, SA 5042, Australia; (D.S.); (S.U.); (P.H.); (C.S.K.); (D.I.W.)
- Flinders Health and Medical Research Institute, Flinders University, Adelaide, SA 5042, Australia
- Department of Medical Oncology, Flinders Medical Centre, Flinders University, Adelaide, SA 5042, Australia
| | - David I. Watson
- College of Medicine and Public Health, Flinders University, Adelaide, SA 5042, Australia; (D.S.); (S.U.); (P.H.); (C.S.K.); (D.I.W.)
- Flinders Medical Center, Division of Surgery and Perioperative Medicine, Flinders University, Adelaide, SA 5042, Australia; (M.E.B.-S.); (M.Y.)
- Flinders Health and Medical Research Institute, Flinders University, Adelaide, SA 5042, Australia
| | - Stephen J. Pandol
- Cedars-Sinai Medical Center, Division of Digestive and Liver Diseases, Los Angeles, CA 90048, USA;
| | - Claire T. Roberts
- College of Medicine and Public Health, Flinders University, Adelaide, SA 5042, Australia; (D.S.); (S.U.); (P.H.); (C.S.K.); (D.I.W.)
- Flinders Health and Medical Research Institute, Flinders University, Adelaide, SA 5042, Australia
- Correspondence: (C.T.R.); (S.G.B.)
| | - Savio G. Barreto
- College of Medicine and Public Health, Flinders University, Adelaide, SA 5042, Australia; (D.S.); (S.U.); (P.H.); (C.S.K.); (D.I.W.)
- Flinders Medical Center, Division of Surgery and Perioperative Medicine, Flinders University, Adelaide, SA 5042, Australia; (M.E.B.-S.); (M.Y.)
- Flinders Health and Medical Research Institute, Flinders University, Adelaide, SA 5042, Australia
- Correspondence: (C.T.R.); (S.G.B.)
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Kreidieh M, Mukherji D, Temraz S, Shamseddine A. Expanding the Scope of Immunotherapy in Colorectal Cancer: Current Clinical Approaches and Future Directions. BIOMED RESEARCH INTERNATIONAL 2020; 2020:9037217. [PMID: 32090113 PMCID: PMC7008242 DOI: 10.1155/2020/9037217] [Citation(s) in RCA: 30] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/26/2019] [Accepted: 08/16/2019] [Indexed: 12/14/2022]
Abstract
The success of immune checkpoint inhibitors (ICIs) in an increasing range of heavily mutated tumor types such as melanoma has culminated in their exploration in different subsets of patients with metastatic colorectal cancer (mCRC). As a result of their dramatic and durable response rates in patients with chemorefractory, mismatch repair-deficient-microsatellite instability-high (dMMR-MSI-H) mCRC, ICIs have become potential alternatives to classical systemic therapies. The anti-programmed death-1 (PD-1) agents, Pembrolizumab and Nivolumab, have been granted FDA approval for this subset of patients. Unfortunately, however, not all CRC cases with the dMMR-MSI-H phenotype respond well to ICIs, and ongoing studies are currently exploring biomarkers that can predict good response to them. Another challenge lies in developing novel treatment strategies for the subset of patients with the mismatch repair-proficient-microsatellite instability-low (pMMR-MSI-L) phenotype that comprises 95% of all mCRC cases in whom treatment with currently approved ICIs has been largely unsuccessful. Approaches aiming at overcoming the resistance of tumors in this subset of patients are being developed including combining different checkpoint inhibitors with either chemotherapy, anti-angiogenic agents, cancer vaccines, adoptive cell transfer (ACT), or bispecific T-cell (BTC) antibodies. This review describes the rationale behind using immunotherapeutics in CRC. It sheds light on the progress made in the use of immunotherapy in the treatment of patients with dMMR-MSI-H CRC. It also discusses emerging approaches and proposes potential strategies for targeting the immune microenvironment in patients with pMMR-MSI-L CRC tumors in an attempt to complement immune checkpoint inhibition.
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Affiliation(s)
- Malek Kreidieh
- Division of Hematology and Oncology, Department of Internal Medicine, American University of Beirut, Beirut, Lebanon
| | - Deborah Mukherji
- Division of Hematology and Oncology, Department of Internal Medicine, American University of Beirut, Beirut, Lebanon
| | - Sally Temraz
- Division of Hematology and Oncology, Department of Internal Medicine, American University of Beirut, Beirut, Lebanon
| | - Ali Shamseddine
- Division of Hematology and Oncology, Department of Internal Medicine, American University of Beirut, Beirut, Lebanon
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5
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Affiliation(s)
- Savio George Barreto
- Division of Surgery & Perioperative Medicine, Flinders Medical Centre, Bedford Park, Adelaide, South Australia, Australia.,College of Medicine & Public Health, Flinders University, South Australia, Australia
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Puccini A, Lenz HJ, Marshall JL, Arguello D, Raghavan D, Korn WM, Weinberg BA, Poorman K, Heeke AL, Philip PA, Shields AF, Goldberg RM, Salem ME. Impact of Patient Age on Molecular Alterations of Left-Sided Colorectal Tumors. Oncologist 2019; 24:319-326. [PMID: 30018131 PMCID: PMC6519749 DOI: 10.1634/theoncologist.2018-0117] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2018] [Accepted: 04/27/2018] [Indexed: 12/21/2022] Open
Abstract
BACKGROUND The incidence of colorectal cancer (CRC) in younger patients is rising, mostly due to tumors in the descending colon and rectum. Therefore, we aimed to explore the molecular differences of left-sided CRC between younger (≤45 years) and older patients (≥65). SUBJECTS, MATERIALS, AND METHODS In total, 1,126 CRC tumor samples from the splenic flexure to (and including) the rectum were examined by next-generation sequencing (NGS), immunohistochemistry, and in situ hybridization. Microsatellite instability (MSI) and tumor mutational burden (TMB) were assessed by NGS. RESULTS Younger patients (n = 350), when compared with older patients (n = 776), showed higher mutation rates in genes associated with cancer-predisposing syndromes (e.g., Lynch syndrome), such as MSH6 (4.8% vs. 1.2%, p = .005), MSH2 (2.7% vs. 0.0%, p = .004), POLE (1.6% vs. 0.0%, p = .008), NF1 (5.9% vs. 0.5%, p < .001), SMAD4 (14.3% vs. 8.3%, p = .024), and BRCA2 (3.7% vs. 0.5%, p = .002). Genes involved in histone modification were also significantly more mutated: KDM5C (1.9% vs. 0%, p = .036), KMT2A (1.1% vs. 0%, p = .033), KMT2C (1.6% vs. 0%, p = .031), KMT2D (3.8% vs. 0.7%, p = .005), and SETD2 (3.2% vs. 0.9%, p = .039). Finally, TMB-high (9.7% vs. 2.8%, p < .001) and MSI-high (MSI-H; 8.1% vs. 1.9%, p = .009) were more frequent in younger patients. CONCLUSION Our findings highlight the importance of genetic counseling and screening in younger CRC patients. MSI-H and TMB-high tumors could benefit from immune-checkpoint inhibitors, now approved for the treatment of MSI-H/deficient mismatch repair metastatic CRC patients. Finally, histone modifiers could serve as a new promising therapeutic target. With confirmatory studies, these results may influence our approach to younger adults with CRC. IMPLICATIONS FOR PRACTICE The increasing rate of colorectal cancers (CRC), primarily distal tumors, among young adults poses a global health issue. This study investigates the molecular differences between younger (≤45 years old) and older (≥65) adults with left-sided CRCs. Younger patients more frequently harbor mutations in genes associated with cancer-predisposing syndromes. Higher rates of microsatellite instability-high and tumor mutational burden-high tumors occur in younger patients, who could benefit from immune-checkpoint inhibitors. Finally, histone modifiers are more frequently mutated in younger patients and could serve as a new promising therapeutic target. This study provides new insights into mutations that may guide development of novel tailored therapy in younger CRC patients.
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Affiliation(s)
- Alberto Puccini
- Division of Medical Oncology, Norris Comprehensive Cancer Center, Keck School of Medicine, University of Southern California, Los Angeles, California, USA
- Department of Medical Oncology, Ospedale Policlinico San Martino, Genova, Italy
| | - Heinz-Josef Lenz
- Division of Medical Oncology, Norris Comprehensive Cancer Center, Keck School of Medicine, University of Southern California, Los Angeles, California, USA
| | - John L Marshall
- Ruesch Center for The Cure of Gastrointestinal Cancers, Lombardi Comprehensive Cancer Center, Georgetown University Medical Center, Washington, DC, USA
| | | | - Derek Raghavan
- Levine Cancer Institute, Carolinas HealthCare System, Charlotte, North Carolina, USA
| | | | - Benjamin A Weinberg
- Ruesch Center for The Cure of Gastrointestinal Cancers, Lombardi Comprehensive Cancer Center, Georgetown University Medical Center, Washington, DC, USA
| | | | - Arielle L Heeke
- Ruesch Center for The Cure of Gastrointestinal Cancers, Lombardi Comprehensive Cancer Center, Georgetown University Medical Center, Washington, DC, USA
| | - Philip A Philip
- Department of Oncology, Karmanos Cancer Institute, Wayne State University, Detroit, Michigan, USA
| | - Anthony F Shields
- Department of Oncology, Karmanos Cancer Institute, Wayne State University, Detroit, Michigan, USA
| | - Richard M Goldberg
- West Virginia University Cancer Institute, Morgantown, West Virginia, USA
| | - Mohamed E Salem
- Levine Cancer Institute, Carolinas HealthCare System, Charlotte, North Carolina, USA
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Russo A, Sala P, Alberici P, Gazzoli I, Radice P, Montefusco C, Torrini M, Mareni C, Fornasarig M, Santarosa M, Viel A, Benatti P, Pedroni M, De Leon MP, Lucci-Cordisco E, Genuardi M, Messerini L, Stigliano V, Cama A, Curia MC, De Lellis L, Signoroni S, Pierotti MA, Bertario L. Prognostic Relevance of MLH1 and MSH2 Mutations in Hereditary Non-Polyposis Colorectal Cancer Patients. TUMORI JOURNAL 2018; 95:731-8. [DOI: 10.1177/030089160909500616] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Aims and Background Colorectal carcinoma patients from hereditary non-polyposis colorectal cancer families are suggested to have a better prognosis than sporadic colorectal carcinoma cases. Since the majority of hereditary non-polyposis colorectal cancer-related colorectal carcinomas are characterized by microsatellite instability due to germline mutations in DNA mismatch repair genes, this is consistent with the prolonged survival observed in sporadic microsatellite instability-positive colorectal carcinoma compared to microsatellite stable cases. However, a fraction of colorectal carcinoma cases belongs to families that, despite fulfilling the clinical criteria for hereditary non-polyposis colorectal cancer, do not carry mismatch repair gene mutations. Our aim was to verify to what extent the genotypic heterogeneity influences the prognosis of hereditary non-polyposis colorectal cancer patients. Methods A survival analysis was performed on 526 colorectal carcinoma cases from 204 Amsterdam Criteria-positive hereditary non-polyposis colorectal cancer families. Enrolled cases were classified as MLH1-positive, MSH2-positive and mutation-negative, according to the results of genetic testing in each family. Results Five-year survival rates were 0.73 (95% CI, 0.66-0.80), 0.75 (95% CI, 0.66-0.84) and 0.62 (95% CI, 0.55-0.68) for MLH1-positive, MSH2-positive and mutation-negative groups, respectively (logrank test, P = 0.01). Hazard ratio, computed using Cox regression analysis and adjusted for age, sex, tumor site and stage, was 0.71 (95% CI, 0.51-0.98) for the mutation-positive compared to the mutation-negative group. Moreover, in the latter group, patients with microsatellite instability-positive colorectal carcinomas showed a better outcome than microsatellite stable cases (5-year survival rates, 0.81 and 0.60, respectively; logrank test, P = 0.006). Conclusions Our results suggest that the prognosis of hereditary non-polyposis colorectal cancer-related colorectal carcinoma patients depends on the associated constitutional mismatch repair genotype.
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Affiliation(s)
| | - Paola Sala
- Department of Preventive-Predictive Medicine, IRCCS Istituto Nazionale Tumori Foundation, Milan
| | - Paola Alberici
- Department of Experimental Oncology and Molecular Medicine, IRCCS Istituto Nazionale Tumori Foundation, Milan
| | - Isabella Gazzoli
- Department of Experimental Oncology and Molecular Medicine, IRCCS Istituto Nazionale Tumori Foundation, Milan
| | - Paolo Radice
- Department of Experimental Oncology and Molecular Medicine, IRCCS Istituto Nazionale Tumori Foundation, Milan
| | - Claudia Montefusco
- Department of Experimental Oncology and Molecular Medicine, IRCCS Istituto Nazionale Tumori Foundation, Milan
| | | | | | - Mara Fornasarig
- Gastroenterology Unit, National Cancer Institute, Aviano (PN)
| | | | - Alessandra Viel
- Experimental Oncology 1, National Cancer Institute, Aviano (PN)
| | - Piero Benatti
- First Medical Division, Department of Medicine and Medical Specialties, University of Modena and Reggio Emilia, Modena
| | - Monica Pedroni
- First Medical Division, Department of Medicine and Medical Specialties, University of Modena and Reggio Emilia, Modena
| | - Maurizio Ponz De Leon
- First Medical Division, Department of Medicine and Medical Specialties, University of Modena and Reggio Emilia, Modena
| | | | - Maurizio Genuardi
- Genetics Unit, Department of Clinical Pathophysiology, University of Florence, Florence
| | - Luca Messerini
- Department of Clinical Pathology, University of Florence, Florence
| | - Vittoria Stigliano
- Gastroenterology and Digestive Endoscopy Unit, Regina Elena Cancer Institute, Rome
| | - Alessandro Cama
- Department of Oncology and Neurosciences, University “G. D'Annunzio”, and Center of Excellence on Aging “G. D'Annunzio”, Chieti
| | - Maria Cristina Curia
- Department of Oncology and Neurosciences, University “G. D'Annunzio”, and Center of Excellence on Aging “G. D'Annunzio”, Chieti
| | - Laura De Lellis
- Department of Oncology and Neurosciences, University “G. D'Annunzio”, and Center of Excellence on Aging “G. D'Annunzio”, Chieti
| | - Stefano Signoroni
- Department of Preventive-Predictive Medicine, IRCCS Istituto Nazionale Tumori Foundation, Milan
| | - Marco A Pierotti
- IRCCS Istituto Nazionale Tumori Foundation, Milan, and Molecular Genetics of Cancer, FIRC Institute of Molecular Oncology Foundation, Milan, Italy
| | - Lucio Bertario
- Department of Preventive-Predictive Medicine, IRCCS Istituto Nazionale Tumori Foundation, Milan
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Bernardo C, Gonzílez J, Sanz L, Barbón E, Noval J, Fresno M, Aza J. Mismatch Repair Protein MSH2 Expression and Prognosis of Colorectal Cancer Patients. Int J Biol Markers 2018. [DOI: 10.1177/172460080401900303] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Introduction and aims The role of genetic factors in the etiology and prognosis of patients with sporadic colorectal cancer is controversial. We have therefore investigated the biological and clinicopathological influence of immunohistochemical MSH2 expression in colorectal cancer. Patients and methods A total of 49 consecutive patients with unselected colorectal cancer operated on in our unit were included in the study. All tumors were resected and tumor specimens were evaluated for MSH2 expression. Clinicopathological data and patient survival were correlated with MSH2 staining. Uni- and multivariate analyses were performed. The minimum follow-up period was five years. Results Curative resection was performed in 34 patients (64.9%), 14 of whom subsequently relapsed. At the end of the overall follow-up 25 (51%) patients had died, 21 of cancer-related causes. Twenty-eight patients (57.1%) were negative for MSH2 staining. Only vascular invasion was significantly correlated with MSH2 expression (lower median values; p=0.04). The overall median survival was 47.9 months (95% CI=27–86.6%). Multivariate analysis of variables in relation to survival showed that T stage (p=0.001), N stage (p<0.001) and MSH2 expression (p=0.01) were independent factors for survival. Conclusions Reduced MSH2 expression is frequent in unselected colorectal cancer patients. Only vascular invasion was correlated with MSH2 expression in this study. Survival was related to TN stage and MSH2 staining.
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Affiliation(s)
- C.G. Bernardo
- Department of Surgery, Hospital
Central, University Institute of Oncology, University of Oviedo, Oviedo -
Spain
| | - J.J. Gonzílez
- Department of Surgery, Hospital
Central, University Institute of Oncology, University of Oviedo, Oviedo -
Spain
| | - L. Sanz
- Department of Surgery, Hospital
Central, University Institute of Oncology, University of Oviedo, Oviedo -
Spain
| | - E. Barbón
- Department of Surgery, Hospital
Central, University Institute of Oncology, University of Oviedo, Oviedo -
Spain
| | - J.G. Noval
- Department of Surgery, Hospital
Central, University Institute of Oncology, University of Oviedo, Oviedo -
Spain
| | - M.F. Fresno
- Department of Pathology, Hospital
Central, University Institute of Oncology, University of Oviedo, Oviedo -
Spain
| | - J. Aza
- Department of Surgery, Hospital
Central, University Institute of Oncology, University of Oviedo, Oviedo -
Spain
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Younger Age Is Associated with Poorer Survival in Patients with Signet-Ring Cell Carcinoma of the Colon without Distant Metastasis. Gastroenterol Res Pract 2016; 2016:2913493. [PMID: 27994618 PMCID: PMC5138479 DOI: 10.1155/2016/2913493] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/18/2016] [Revised: 10/02/2016] [Accepted: 10/19/2016] [Indexed: 12/21/2022] Open
Abstract
Background. In general, younger age is associated with better survival in patients with colon cancer. In this study, we aim to analyze the impact of age on cancer-specific survival (CSS) in patients with signet-ring cell carcinoma (SRCC) of the colon, a particularly aggressive type of colon cancer. Methods. Information on patients with SRCC of the colon with no distant metastasis was extracted from the US Surveillance, Epidemiology, and End Results (SEER) database. An X-tile plot was used to determine the optimal cutoff age at diagnosis. Results. A total of 776 patients were included in data analysis. The X-tile program revealed an optimal cutoff at 35 years of age. A higher percentage of stage III disease and a higher percentage of N2 disease were observed in patients ≤ 35 years of age. The multivariate Cox proportional model demonstrated that patients ≤ 35 years of age were more likely to have a poorer survival outcome compared with patients aged >35 years (HR 1.411, 95% CI 1.032–1.929, and P = 0.031). Conclusion. In contrast to the association of younger age with better survival in colon cancer patients, younger age (≤35 years) is associated with poorer survival outcome in patients with SRCC of the colon without distant metastasis.
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10
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11
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Gorovoy IR, de Alba Campomanes A. A potential life-saving diagnosis--recognizing Turcot syndrome. J AAPOS 2014; 18:186-8. [PMID: 24698620 DOI: 10.1016/j.jaapos.2013.09.018] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/19/2013] [Revised: 09/09/2013] [Accepted: 09/14/2013] [Indexed: 11/17/2022]
Abstract
A previously healthy 9-year-old girl presented with ataxia, headaches, and nausea of 1 month's duration. Magnetic resonance imaging demonstrated a large posterior fossa mass. Posterior segment examination revealed pigmented ocular fundus lesions (POFLs), which included cometoid dark lesions with depigmented tails and smaller, dark midperipheral lesions. The patient underwent resection for a medulloblastoma. Because of these specific retinal lesions in combination with her medullobastoma, a diagnosis of Turcot syndrome was made and subsequently confirmed by genetic testing. Turcot syndrome is one of the familial adenomatous polyposis (FAP) syndromes. This diagnosis may be life-saving because 100% of FAP patients develop colon cancer that can be cured only early with timely colectomy.
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Affiliation(s)
- Ian R Gorovoy
- Department of Ophthalmology, University of California-San Francisco, San Francisco, California.
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12
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AJR teaching file: brain tumor in a patient with familial adenomatous polyposis. AJR Am J Roentgenol 2010; 195:S25-8. [PMID: 20729408 DOI: 10.2214/ajr.07.7128] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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13
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Rozek LS, Herron CM, Greenson JK, Moreno V, Capella G, Rennert G, Gruber SB. Smoking, gender, and ethnicity predict somatic BRAF mutations in colorectal cancer. Cancer Epidemiol Biomarkers Prev 2010; 19:838-43. [PMID: 20200438 DOI: 10.1158/1055-9965.epi-09-1112] [Citation(s) in RCA: 59] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
Approximately 5% to 15% of all colorectal cancers (CRC) have an activating BRAF somatic mutation, which may be associated with a distinct risk profile compared with tumors without BRAF mutations. Here, we measured the prevalence and epidemiologic correlates of the BRAF V600E somatic mutation in cases collected as a part of a population-based case-control study of CRC in northern Israel. The prevalence of BRAF V600E was 5.0% in this population, and the mutation was more likely to be found in tumors from cases who were of Ashkenazi Jewish descent [odds ratio (OR), 1.87; 95% confidence interval (95% CI), 1.01-3.47], female (OR, 1.97; P = 1.17-3.31), and older (73.8 years versus 70.3 years; P < 0.001). These results were similar when restricting to only tumors with microsatellite instability. Whether smoking was associated with a BRAF somatic mutation depended on gender. Although men were less likely to have a tumor with a BRAF somatic mutation, men who smoked were much more likely to have a tumor with a somatic BRAF mutation (OR(interaction), 4.95; 95% CI, 1.18-20.83) than women who never smoked. We note the strong heterogeneity in the reported prevalence of the BRAF V600E mutation in studies of different ethnicities, with a lower prevalence in Israel than other Western populations but a higher prevalence among Jewish than non-Jewish Israeli cases. Epidemiologic studies of CRC should incorporate somatic characteristics to fully appreciate risk factors for this disease.
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Affiliation(s)
- Laura S Rozek
- Environmental Health Sciences, School of Public Health, University of Michigan Medical School, Ann Arbor, MI 48109-2200, USA
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14
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Fenjvesi A. [Prognostic significance of macrosatellite instability in patients uder 50 years of age suffering from colorectal cancer]. MEDICINSKI PREGLED 2009; 62:217-223. [PMID: 19650557 DOI: 10.2298/mpns0906217f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
INTRODUCTION Colorectal cancer (CRC) can arise through two distinct mutational pathways: microsatellite instability or chromosomal instability. High-frequency microsatellite instability (MSI) occurs in approximately 15 percent of sporadic cases of CRCs. Many studies have well established that MSI, the hallmark of defective DNA mismatch repair, is associated with prolonged survival of CRC patients compared with tumors that are microsatellite stable. CRCs in patients under 50 years of age are rare and represent about 5% of the total number of tumors. The aim of this study was to analyze the prognostic significance of MSI in CRC patients younger than 50 at the time of diagnosis. MATERIAL AND METHODS 31 patients with CRC under 50 years of age were tested for the presence of MSI, and compared with 35 patients aged 50 or more at the time of diagnosis. CRC-specific survival five-year-follow-up period was analyzed in relation to MSI status. RESULTS The frequency of MSI among the young patients was 35.48%, which was significantly higher than the rate of 11.43% noted in older patients with CRCs (p<0.042). This study revealed no difference in survival in patients with CRCs aged less than 50 compared with those over 50 years of age. The five-years survival of young CRCs patients with MSI 81.82%, was better than that of the patients with cancers with microsatellite stability, 60%, but there was no significant difference in statistics. DISCUSSION AND CONCLUSION In our study there was no statistically detectable significant difference between tumor microsatellite status and survival in young patients, although we confirmed the previous observations that MSI is associated with better prognosis. We found that the pathological stage of CRC was an independent and powerful predictor of the clinical outcome.
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Affiliation(s)
- Atila Fenjvesi
- Zdravstveni centar "Dr Gere Istvan", Senta, Bolnica, Patologija
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15
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Krüger S, Engel C, Bier A, Silber AS, Görgens H, Mangold E, Pagenstecher C, Holinski-Feder E, von Knebel Doeberitz M, Royer-Pokora B, Dechant S, Pox C, Rahner N, Müller A, Schackert HK. The additive effect of p53 Arg72Pro and RNASEL Arg462Gln genotypes on age of disease onset in Lynch syndrome patients with pathogenic germline mutations in MSH2 or MLH1. Cancer Lett 2007; 252:55-64. [PMID: 17224235 DOI: 10.1016/j.canlet.2006.12.006] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2006] [Revised: 12/01/2006] [Accepted: 12/04/2006] [Indexed: 01/28/2023]
Abstract
p53 and the prostate-cancer-susceptibility gene RNASEL are tumour suppressor genes involved in apoptosis. We have previously reported that the common, functionally different variants Arg72Pro in p53 and Arg462Gln in RNASEL are associated with the age of disease onset of colorectal cancer in Lynch syndrome patients. To assess the combined effect of both variants, we screened 246 unrelated Lynch syndrome patients with a pathogenic germline mutation either in MSH2 (n=138) or in MLH1 (n=108) and colorectal cancer as first tumour, and 245 healthy controls. The global log rank test revealed significant differences in the age of disease onset for the genotypes of each variant (p=0.0176 for p53 and p=0.0358 for RNASEL) and for the combined genotypes of both variants (p=0.0174). The highest difference in median age of disease onset was seen between homozygotes for the wild-types in both genes (42years [range 22-75]) and homozygotes for the variant alleles in both genes (30years [range 26-47]). A multivariate Cox regression model indicated that only the p53 and RNASEL genotypes had a significant influence on age of disease onset (p=0.016 for p53 and p=0.014 for RNASEL) in an additive mode of inheritance, and that the effects of both variants are purely additive, which supports the notion that the p53 and RNaseL pathways do not interact. These findings may be relevant for preventive strategies in Lynch syndrome.
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Affiliation(s)
- Stefan Krüger
- Department of Surgical Research, Dresden University of Technology, D-01307 Dresden, Germany.
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16
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Locker GY, Hamilton S, Harris J, Jessup JM, Kemeny N, Macdonald JS, Somerfield MR, Hayes DF, Bast RC. ASCO 2006 Update of Recommendations for the Use of Tumor Markers in Gastrointestinal Cancer. J Clin Oncol 2006; 24:5313-27. [PMID: 17060676 DOI: 10.1200/jco.2006.08.2644] [Citation(s) in RCA: 1042] [Impact Index Per Article: 57.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
PurposeTo update the recommendations for the use of tumor marker tests in the prevention, screening, treatment, and surveillance of gastrointestinal cancers.MethodsFor the 2006 update, an update committee composed of members from the full Panel was formed to complete the review and analysis of data published since 1999. Computerized literature searches of Medline and the Cochrane Collaboration Library were performed. The Update Committee's literature review focused attention on available systematic reviews and meta-analyses of published tumor marker studies.Recommendations and ConclusionFor colorectal cancer, it is recommended that carcinoembryonic antigen (CEA) be ordered preoperatively, if it would assist in staging and surgical planning. Postoperative CEA levels should be performed every 3 months for stage II and III disease for at least 3 years if the patient is a potential candidate for surgery or chemotherapy of metastatic disease. CEA is the marker of choice for monitoring the response of metastatic disease to systemic therapy. Data are insufficient to recommend the routine use of p53, ras, thymidine synthase, dihydropyrimidine dehydrogenase, thymidine phosphorylase, microsatellite instability, 18q loss of heterozygosity, or deleted in colon cancer (DCC) protein in the management of patients with colorectal cancer. For pancreatic cancer, CA 19-9 can be measured every 1 to 3 months for patients with locally advanced or metastatic disease receiving active therapy. Elevations in serial CA 19-9 determinations suggest progressive disease but confirmation with other studies should be sought. New markers and new evidence to support the use of the currently reviewed markers will be evaluated in future updates of these guidelines.
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Affiliation(s)
- Gershon Y Locker
- American Society of Clinical Oncology Tumor Markers Expert Panel, Alexandria, VA 22314, USA
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17
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Olschwang S, Bonaïti-Pellié C, Feingold J, Frébourg T, Grandjouan S, Lasset C, Laurent-Puig P, Lecuru F, Millat B, Sobol H, Thomas G, Eisinger F. [Identification and management of HNPCC syndrome (hereditary non polyposis colon cancer), hereditary predisposition to colorectal and endometrial adenocarcinomas]. ACTA ACUST UNITED AC 2006; 54:215-29. [PMID: 16677780 DOI: 10.1016/j.patbio.2006.02.008] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2005] [Accepted: 02/15/2006] [Indexed: 12/14/2022]
Abstract
BACKGROUND The HNPCC syndrome (hereditary nonpolyposis colon cancer) is an inherited condition defined by clinical and genealogical information, known as Amsterdam criteria. In about 70% of cases, HNPCC syndrome is caused by germline mutations in MMR genes, leading to microsatellite instability of tumor DNA (MSI phenotype). Patients affected by the disease are at high risk for colorectal and endometrial carcinomas, but also for small intestine, urothelial, ovary, stomach and biliary tract carcinomas. HNPCC syndrome is responsible for 5% of colorectal cancers. Identification and management of this disease are part of a multidisciplinary procedure. METHODS Twelve experts have been mandated by the French Health Ministry to analyze and synthesize their consensus position, and the resulting document has been reviewed by an additional group of 4 independent experts. MAIN RECOMMENDATIONS The lack of sensitivity of Amsterdam criteria in recognizing patients carrying a MMR germline mutation led to an enlargement of these criteria for the recruitment of possible HNPCC patients, and to a 2-steps strategy, asking first for a tumor characterization according to MSI phenotype, especially in case of early-onset sporadic cases. The identification of germline MMR mutations has no major consequence on the cancer treatments, but influences markedly the long-term follow-up and the management of at-risk relatives. Gene carriers will enter a follow-up program regarding their colorectal and endometrial cancer risks, but other organs being at low lifetime risk, no specific surveillance will be proposed.
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18
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Krüger S, Silber AS, Engel C, Görgens H, Mangold E, Pagenstecher C, Holinski-Feder E, von Knebel Doeberitz M, Moeslein G, Dietmaier W, Stemmler S, Friedl W, Rüschoff J, Schackert HK. Arg462Gln sequence variation in the prostate-cancer-susceptibility gene RNASEL and age of onset of hereditary non-polyposis colorectal cancer: a case-control study. Lancet Oncol 2005; 6:566-72. [PMID: 16054567 DOI: 10.1016/s1470-2045(05)70253-9] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
BACKGROUND RNASEL is thought to be a susceptibility gene for hereditary prostate cancer and encodes the endoribonuclease RNase L, which has a role in apoptosis and is a candidate tumour-suppressor protein. A common sequence variation in RNASEL, Arg462Gln, has been associated with hereditary and sporadic prostate cancer, and the Gln variant has about three-fold reduced RNase activity in vitro. In view of the association between the age of onset of hereditary non-polyposis colorectal cancer and functionally different variants of P53, which play a key part in the apoptotic pathway, we aimed to assess whether the Arg462Gln variation of RNASEL affects the age of onset of hereditary non-polyposis colorectal cancer. METHODS We screened 251 patients with hereditary non-polyposis colorectal cancer who were unrelated, had pathogenic germline mutations in MSH2 (n=141) or MLH1 (n=110), and had colorectal carcinoma as the first tumour, for variation at codon 462 of RNASEL and compared them with 439 healthy controls. FINDINGS The median age of onset was 40 years (range 17-75) for patients with an Arg/Arg genotype at codon 462, 37 years (13-69) for patients with an Arg/Gln genotype, and 34 years (20-49) for those with a Gln/Gln genotype (p=0.0198). Only the RNASEL genotype had a significant effect on age of onset (p=0.0062) in an additive mode of inheritance. Pair-wise comparisons between genotype groups showed that the two homozygous groups (ie, Arg/Arg vs Gln/Gln) differed significantly in age of disease onset (mean age difference 4.8 years [SD 1.7], p=0.0044). INTERPRETATION A sequence variation in the prostate-cancer-susceptibility gene RNASEL has a role in a different, unassociated malignant disease. Genotypes at RNASEL codon 462 are associated with age of onset of hereditary non-polyposis colorectal cancer in a dose-dependent way, and might have a role in preventive strategies for this disease.
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Affiliation(s)
- Stefan Krüger
- Department of Surgical Research, Dresden University of Technology, Dresden, Germany.
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Olschwang S, Eisinger F. Prédisposition héréditaire au cancer colorectal et inactivation de la fonction de réparation des mésappariements de l'ADN. ACTA ACUST UNITED AC 2005. [DOI: 10.1016/j.emchg.2005.03.002] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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20
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Hatch SB, Lightfoot HM, Garwacki CP, Moore DT, Calvo BF, Woosley JT, Sciarrotta J, Funkhouser WK, Farber RA. Microsatellite instability testing in colorectal carcinoma: choice of markers affects sensitivity of detection of mismatch repair-deficient tumors. Clin Cancer Res 2005; 11:2180-7. [PMID: 15788665 DOI: 10.1158/1078-0432.ccr-04-0234] [Citation(s) in RCA: 62] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
PURPOSE Microsatellite instability (MSI) is found in 10% to 15% of sporadic colorectal tumors and is usually caused by defects in DNA mismatch repair (MMR). In 1997, a panel of microsatellite markers including mononucleotide and dinucleotide repeats was recommended by a National Cancer Institute workshop on MSI. We investigated the relationship between instability of these markers and MMR protein expression in a cohort of sporadic colorectal cancer patients. EXPERIMENTAL DESIGN Paraffin sections of normal and tumor tissue from 262 colorectal cancer patients were examined for MSI status by PCR amplification and for MMR protein expression using antibodies against hMLH1, hPMS2, hMSH2, and hMSH6. RESULTS Twenty-six (10%) of the patients studied had tumors with a high level of MSI (MSI-H). The frequencies of MSI were the same in African-American and Caucasian patients. Each of the MSI-H tumors had mutations in both mononucleotide and dinucleotide repeats and had loss of MMR protein expression, as did two tumors that had low levels of MSI (MSI-L). These two MSI-L tumors exhibited mutations in mononucleotide repeats only, whereas eight of the other nine MSI-L tumors had mutations in just a single dinucleotide repeat. There was not a statistically significant difference in outcomes between patients whose tumors were MMR-positive or MMR-negative, although there was a slight trend toward improved survival among those with MMR-deficient tumors. CONCLUSIONS The choice of microsatellite markers is important for MSI testing. Examination of mononucleotide repeats is sufficient for detection of tumors with MMR defects, whereas instability only in dinucleotides is characteristic of MSI-L/MMR-positive tumors.
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Affiliation(s)
- Stephanie B Hatch
- Curriculum in Genetics and Molecular Biology, Department of Genetics, Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA
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Bonaïti-Pellié C, Eisinger F, Feingold J, Frébourg T, Grandjouan S, Lasset C, Laurent-Puig P, Lecuru F, Millat B, Sobol H, Thomas G, Olschwang S. Prédispositions héréditaires au cancer colorectal. ACTA ACUST UNITED AC 2005; 29:701-10. [PMID: 16142005 DOI: 10.1016/s0399-8320(05)82159-1] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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22
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Yuan Z, Gaba AG, Kent TS, Bennett A, Miller A, Weber TK. Modulation of CDK2-AP1 (p12DOC−1) expression in human colorectal cancer. Oncogene 2005; 24:3657-68. [PMID: 15806176 DOI: 10.1038/sj.onc.1208378] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
We have previously demonstrated an association between microsatellite instability and decreased CDK2-AP1 (p12(DOC-1)) expression in human colorectal cancer (CRC) cell lines. In those same studies, induction of CDK2-AP1 expression promoted both cell cycle arrest and apoptosis. The goals of our present study were to better understand the mechanisms leading to reduced CDK2-AP1 expression in microsatellite unstable (MSI) CRC and to study further the effect of CDK2-AP1 modulation on cell proliferation and apoptosis utilizing RNA interference (RNAi) techniques. We used direct sequencing to screen for mutations of the poly (T)8 microsatellite-like region in the 3' end of the CDK2-AP1 gene in 24 CRC cell lines. We then utilized an in vitro human mismatch repair (MMR) recombinant system to assess for correction of the mutation and changes in CDK2-AP1 expression secondary to hMLH1 transfection. We also investigated the effect of CDK2-AP1 modulation in four settings: (1) native CDK2-AP1 absence, (2) endogenous CDK2-AP1 expression, (3) RNAi-induced CDK2-AP1 inhibition and (4) induced CDK2-AP1 over expression. The mutation - del T poly (T)8 - at the 3' end of the CDK2-AP1 gene was found in 3/12 (25%) of MSI CRC cell lines, but in none of the microsatellite stable samples (0/12). Interestingly, when wild-type MMR protein - MLH1 - was induced in an in vitro human recombinant system, the del T poly (T)8 mutation was reversed and CDK2-AP1 expression increased. RNAi-mediated CDK2-AP1 inhibition was associated with decreased apoptosis and increased cell proliferation in CDK2-AP1-non deficient CRC cell lines. We conclude that mutations in the microsatellite-like sequence of the CDK2-AP1 gene in MSI CRC are associated with decreased CDK2-AP1 expression. In addition, modulation of CDK2-AP1 expression in human CRC alters cell proliferation and apoptosis.
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Affiliation(s)
- Ziquan Yuan
- Department of Molecular Genetics, Albert Einstein College of Medicine, 1300 Morris Park Avenue, Ullmann 707, New York, NY 10461, USA
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23
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Popat S, Hubner R, Houlston RS. Systematic review of microsatellite instability and colorectal cancer prognosis. J Clin Oncol 2005; 23:609-18. [PMID: 15659508 DOI: 10.1200/jco.2005.01.086] [Citation(s) in RCA: 1270] [Impact Index Per Article: 66.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
PURPOSE A number of studies have investigated the relationship between microsatellite instability (MSI) and colorectal cancer (CRC) prognosis. Although many have reported a better survival with MSI, estimates of the hazard ratio (HR) among studies differ. To derive a more precise estimate of the prognostic significance of MSI, we have reviewed and pooled data from published studies. METHODS Studies stratifying survival in CRC patients by MSI status were eligible for analysis. The principal outcome measure was the HR. Data from eligible studies were pooled using standard techniques. RESULTS Thirty-two eligible studies reported survival in a total of 7,642 cases, including 1,277 with MSI. There was no evidence of publication bias. The combined HR estimate for overall survival associated with MSI was 0.65 (95% CI, 0.59 to 0.71; heterogeneity P = .16; I(2) = 20%). This benefit was maintained restricting analyses to clinical trial patients (HR = 0.69; 95% CI, 0.56 to 0.85) and patients with locally advanced CRC (HR = 0.67; 95% CI, 0.58 to 0.78). In patients treated with adjuvant fluorouracil (FU) CRCs with MSI had a better prognosis (HR = 0.72; 95% CI, 0.61 to 0.84). However, while data are limited, tumors with MSI derived no benefit from adjuvant FU (HR = 1.24; 95% CI, 0.72 to 2.14). CONCLUSION CRCs with MSI have a significantly better prognosis compared to those with intact mismatch repair. Additional studies are needed to further define the benefit of adjuvant chemotherapy in locally advanced tumors with MSI.
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Affiliation(s)
- S Popat
- MRCP, Institute of Cancer Research, Brookes Lawley Building, Sutton, Surrey SM2 5NG, UK.
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24
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Olschwang S, Bonaïti C, Feingold J, Frébourg T, Grandjouan S, Lasset C, Laurent-Puig P, Lecuru F, Millat B, Sobol H, Thomas G, Eisinger F. Le syndrome HNPCC (hereditary non polyposis colon cancer) : identification et prise en charge. Rev Med Interne 2005; 26:109-18. [PMID: 15710257 DOI: 10.1016/j.revmed.2004.06.004] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2004] [Accepted: 06/04/2004] [Indexed: 01/07/2023]
Abstract
BACKGROUND The hereditary non-polyposis colon cancer (HNPCC) syndrome is an inherited condition defined by clinical and genealogical information, known as Amsterdam criteria. In about 70% of cases, HNPCC syndrome is caused by germline mutations in MMR genes, leading to microsatellite instability of tumor DNA (MSI phenotype). Patients affected by the disease are at high risk for colorectal and endometrial carcinomas, but also for other organs tumors. HNPCC syndrome is responsible for 5% of colorectal cancers. MAJOR ASPECTS The lack of sensitivity of Amsterdam criteria in recognizing patients carrying a MMR germline mutation led to an enlargement of these criteria for the recruitment of possible HNPCC patients, and to a two-steps strategy, asking first for a tumor characterization according to MSI phenotype, especially in case of early-onset sporadic cases. FURTHER DEVELOPMENTS The identification of germline MMR mutations has no major consequence on the cancer treatments, but influences markedly the long-term follow-up and the management of at-risk relatives. Gene carriers will enter a follow-up program regarding their colorectal and endometrial cancer risks; other organs being at low lifetime risk, no specific surveillance will be proposed.
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Affiliation(s)
- S Olschwang
- Institut Paoli-Calmettes, INSERM UMR 599, 232, boulevard Sainte-Marguerite, 13009 Marseille, France
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25
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Clark AJ, Barnetson R, Farrington SM, Dunlop MG. Prognosis in DNA mismatch repair deficient colorectal cancer: are all MSI tumours equivalent? Fam Cancer 2004; 3:85-91. [PMID: 15340258 DOI: 10.1023/b:fame.0000039915.94550.cc] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Microsatellite instability (MSI) in colorectal tumours is the hallmark of defective DNA mismatch repair (MMR) and high level MSI can be detected in up to 15% of incident colorectal cancers. MSI in sporadic colorectal tumours is primarily due to epigenetic silencing of MLH1 while MSI is almost universal in tumours from HNPCC family members due to germline MMR gene mutation with loss or mutational inactivation of the second copy as a somatic event. There is evidence that tumour MSI is associated with a better outcome than the generality of large bowel malignancy. However, although MSI occurs in both sporadic colorectal cancer and in tumours arising in patients with germline MMR gene mutations, cancer survival should not be considered to be equivalent for these two groups with MSI tumours simply because both exhibit similarities in molecular phenotype. Here, we review the evidence on prognosis in patients with sporadic MSI tumours compared to those who have inherited a germline DNA MMR repair gene defect. In addition, we explore whether there are variables that afford opportunity to distinguish three groups on the basis of MSI status, namely: sporadic MSI tumours; MSI tumours in carriers of germline MMR gene defects; microsatellite stable (MSS) tumours. Differences in prognosis between these three groups is important because it underpins the rationale for surveillance and early identification of tumours in MMR gene carriers, as well as refining understanding of the influence of MSI on cancer progression. Furthermore, we discuss the effect of MSI on the effectiveness of chemotherapy regimens.
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Affiliation(s)
- A J Clark
- Colon Cancer Genetics Group, Academic Coloproctology, Division of Oncology, University of Edinburgh, Western General Hospital, Edinburgh, UK
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Anwar S, Frayling IM, Scott NA, Carlson GL. Systematic review of genetic influences on the prognosis of colorectal cancer. Br J Surg 2004; 91:1275-91. [PMID: 15382104 DOI: 10.1002/bjs.4737] [Citation(s) in RCA: 57] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Abstract
Background
In terms of genetics, colorectal cancer is one of the best understood of all malignant diseases. Genetic influences on prognosis may have far-reaching implications, especially for the design of surgical and chemoradiotherapeutic regimens. However, their significance in determining prognosis remains unclear. This study aimed to review the literature on the specific role of key genes in determining the survival of patients with colorectal cancer.
Methods
A Medline search was carried out to identify all original scientific papers relating colorectal cancer genetics to patient survival, up to December 2002. Cochrane and Embase databases were also searched. Identified articles were retrieved and searched carefully for additional information. This review includes K-ras, p53, DCC, NM23 and DNA mismatch repair genes.
Results and conclusion
Conflicting evidence exists as to the prognostic significance of genes commonly implicated in the pathogenesis of colorectal carcinoma. Possible causes for such discrepancy include differences in study methods and laboratory techniques, variable duration of follow-up, statistical differences in study power, and heterogeneity in study populations. Future studies should adopt standardized protocols to define clinically relevant genetic observations.
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Affiliation(s)
- S Anwar
- Department of Colorectal Surgery, Hope Hospital, Salford, UK
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Kim JC, Lee KH, Yu CS, Kim HC, Kim JR, Chang HM, Kim JH, Kim JS, Kim TW. The clinicopathological significance of inferior mesenteric lymph node metastasis in colorectal cancer. Eur J Surg Oncol 2004; 30:271-9. [PMID: 15028308 DOI: 10.1016/j.ejso.2003.12.002] [Citation(s) in RCA: 66] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/12/2003] [Indexed: 11/18/2022] Open
Abstract
AIMS There are few studies reporting survival or recurrence patterns in colorectal cancer patients with inferior mesenteric lymph node metastasis (IMLN+). The present study evaluated the prognostic significance of patients being IMLN+ or IMLN- in colorectal cancer. METHODS Survival, recurrence pattern and treatment protocols were compared between 63 IMLN+ patients and 108 IMLN- patients with stage III and IV rectal and sigmoid cancer undergoing curative surgery. Lymph node sampling was routinely performed prior to inferior mesenteric artery ligation and excision flush with aorta. Limited principal node dissection including IMLN was performed in cases of identified node metastasis. RESULTS The 5-year disease-free survival rates were 50% in IMLN- and 31% in IMLN+ patients (P=0.004). The 5-year disease-free survival rate was greater in the N1 group than the N2 group (P=0.038). Cox regression analysis showed IMLN+, lymphovascular tumour invasion, T4, M1, and pre-operative serum CEA level over 6 ng/ml were independently associated with unfavorable disease-free survival. The prognostic significance of M category was greater when the IMLN+ was included in the M1 as opposed to the N category. In patients undergoing absolute curative surgery, post-operative recurrence rates were 34% for IMLN- and 57% for IMLN+ patients (P=0.009; OR, 2.611; 95% CI, 1.313-5.194). For IMLN+ patients, post-operative adjuvant treatment independently correlated with disease-free survival (P=0.029). CONCLUSIONS IMLN+ is an independent survival factor enhancing the prognostic significance of the M category in the AJCC staging. Curative radical surgery and post-operative chemoradiotherapy appears to be warranted for IMLN+ colorectal cancer patients as it resulted in 5-year disease-free survival rates of up to 31% compared to 50% in IMLN- patients.
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Affiliation(s)
- J C Kim
- Department of Surgery, University of Ulsan College of Medicine and Asan Medical Center, 388-1 Poongnap-2-Dong Songpa-Ku, Seoul 138-736, South Korea.
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Umar A, Boland CR, Terdiman JP, Syngal S, de la Chapelle A, Rüschoff J, Fishel R, Lindor NM, Burgart LJ, Hamelin R, Hamilton SR, Hiatt RA, Jass J, Lindblom A, Lynch HT, Peltomaki P, Ramsey SD, Rodriguez-Bigas MA, Vasen HFA, Hawk ET, Barrett JC, Freedman AN, Srivastava S. Revised Bethesda Guidelines for hereditary nonpolyposis colorectal cancer (Lynch syndrome) and microsatellite instability. J Natl Cancer Inst 2004; 96:261-8. [PMID: 14970275 PMCID: PMC2933058 DOI: 10.1093/jnci/djh034] [Citation(s) in RCA: 2111] [Impact Index Per Article: 105.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
Hereditary nonpolyposis colorectal cancer (HNPCC), also known as Lynch syndrome, is a common autosomal dominant syndrome characterized by early age at onset, neoplastic lesions, and microsatellite instability (MSI). Because cancers with MSI account for approximately 15% of all colorectal cancers and because of the need for a better understanding of the clinical and histologic manifestations of HNPCC, the National Cancer Institute hosted an international workshop on HNPCC in 1996, which led to the development of the Bethesda Guidelines for the identification of individuals with HNPCC who should be tested for MSI. To consider revision and improvement of the Bethesda Guidelines, another HNPCC workshop was held at the National Cancer Institute in Bethesda, MD, in 2002. In this commentary, we summarize the Workshop presentations on HNPCC and MSI testing; present the issues relating to the performance, sensitivity, and specificity of the Bethesda Guidelines; outline the revised Bethesda Guidelines for identifying individuals at risk for HNPCC; and recommend criteria for MSI testing.
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Affiliation(s)
- Asad Umar
- Division of Cancer Prevention, National Cancer Institute, National Institutes of Health, Department of Health and Human Services, Bethesda, MD 20892, USA.
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Bignami M, Casorelli I, Karran P. Mismatch repair and response to DNA-damaging antitumour therapies. Eur J Cancer 2003; 39:2142-9. [PMID: 14522371 DOI: 10.1016/s0959-8049(03)00569-0] [Citation(s) in RCA: 55] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
Most antitumour therapies damage tumour cell DNA either directly or indirectly. DNA damage responses, and particularly DNA repair, influence the outcome of therapy. Because DNA repair normally excises lethal DNA lesions, it is intuitive that efficient repair will contribute to intrinsic drug resistance. Indeed, in certain circumstances reduced levels of DNA nucleotide excision repair are associated with a good therapeutic outlook (Curr Biol 9 (1999) 273). A paradoxical relationship between DNA mismatch repair (MMR) and drug sensitivity has been revealed by model studies in cell lines. This suggests that connections between MMR and tumour therapy might be more complex. Here, we briefly review how MMR deficiency can affect drug resistance and the extent to which loss of MMR is a prognostic factor in certain cancer therapies. We also consider how the inverse relationship between MMR activity and drug resistance might influence the development of treatment-related malignancies which are increasingly linked to MMR defects.
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Affiliation(s)
- M Bignami
- Laboratorio di Tossicologia Comparata, Istituto Superiore di Sanita', Viale Regina Elena 299, 00161 Rome, Italy.
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Wright CL, Stewart ID. Histopathology and mismatch repair status of 458 consecutive colorectal carcinomas. Am J Surg Pathol 2003; 27:1393-406. [PMID: 14576472 DOI: 10.1097/00000478-200311000-00001] [Citation(s) in RCA: 70] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
Defects in the mismatch repair (MMR) genes hMLH1 and hMSH2 have been found in 10% to 20% of sporadic colorectal carcinomas and also many cases of hereditary nonpolyposis colorectal cancer syndrome. Patients with these tumors have an improved prognosis and may show greater sensitivity to chemotherapy. We examined 458 resected colorectal carcinomas from 430 consecutive patients and used immunohistochemistry to determine which tumors lacked expression of these genes (MMR-d). We correlated the status of MMR-d or "intact" expression with stage, site, and histology. Eighty-nine of 458 tumors (19.4%) were MMR-d, including 80 hMLH1 and 9 hMSH2 tumors. A total of 6% of patients had synchronous tumors, and 37.7% of these were MMR-d (P=0.0008). A high proportion of patients with previous breast cancer (4 of 6 patients) had hMLH1-defective colorectal carcinomas. MMR-d tumors presented at an earlier stage than intact tumors, and the node-positive MMR-d tumors were less likely than intact tumors to have pericolonic extranodal tumor deposits (18.2% vs. 44%). The proportion of tumors at each site that were MMR-d increased progressively from cecum (32%) to ascending (35%) to transverse colon, where 41% of all tumors were defective. The proportions then rapidly decreased, reaching the lowest rate (4.7%) in the rectum. Both types of MMR-d tumors more often had expansive borders, intraepithelial lymphocytosis, peritumoral lymphoid, and Crohn's-like lymphoid responses than the intact tumors; the frequencies of these features diminished with advancing stage. Tumor budding was less common in stage II and III MMR-d tumors than in intact tumors. Keloid and myxoid type stromas correlated with stage and vascular invasion and were not related to mismatch repair status. Significant differences existed between the hMLH1 and hMSH2 tumors. The reported right-sided preponderance of MMR-d tumors is due to most hMLH1, but not hMSH2, tumors being found there (87.5% vs. 44.4%). hMSH2 tumors were most common in the rectum (55.6%). Mucinous tumors were common in hMLH1 tumors (36.3%) but not in hMSH2 tumors (11.1%). hMLH1 tumors were most likely to be poorly differentiated (70%), which was uncommon with hMSH2 tumors (22.2%). hMSH2 tumors were more likely to be confined to the wall (66.7%) than hMLH1 (20%) or intact tumors (23%). We conclude that hMLH1 and hMSH2-defective tumors have distinctly differing histologic features from each other.
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Affiliation(s)
- Cheryl L Wright
- Surgical Pathology Unit, North Shore Hospital, Takapuna, Auckland, New Zealand.
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Xie ZY, Qing SH. Anatomic site distribution and clinic pathologic characteristics of colorectal cancer in young Chinese. Shijie Huaren Xiaohua Zazhi 2003; 11:1511-1514. [DOI: 10.11569/wcjd.v11.i10.1511] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
AIM To study the anatomic site distribution and pathologic characteristics of colorectal cancer (CRC) in young Chinese.
METHODS A retrospective study was undertaken. Data were collected from 1 370 patients in Nan Fang Hospital from 1974 to 1999, including 309 patients younger than 40 years and 1 061 patients older than 40 years. The median age was 54 years. All patients with colorectal adenocarcinomas were diagnosed by histology and underwent surgery.
RESULTS Overall, 22.3% (309/1370) of CRC patients were young people. The proportion of males in the young group was 57.0% vs 58.3% in the aged group (P>0.05, x2 = 0.16). 24.1% of young group vs 25.1% of aged group had lesions in the proximal colon and 72.4% vs 71.2% had cancers located in distal colorectum (P>0.05, x2 = 0.42). Adenocarcinoma was the most common histologic type in both groups. 71.5% of young group vs 83.4% of aged group was adenocarcinoma (P <0.01, x2 = 18.09), 17.4% vs 12.0% was mucinous adenocarcinoma (P<0.05, x2=4.70) and 5.5% vs 1.1% was signet-ring cell carcinoma (P<0.01, x2 = 30.20). 18.2% of young group vs 24.9% of aged group was early stage (Duke's stage A) and 81.9% vs 75.1% was advanced stage (Duke's stage B, C, D) (P <0.05, x2 = 5.13). 20.9% of young group vs 11.1% of aged group was poor differentiation (P<0.01, x2 = 14.75) and 59.5% vs 34.3% had lymphatic metastasis (P<0.01, x2 = 53.25).
CONCLUSION CRC of young people has no significant difference from middle-aged and old people in either gender distribution or anatomic site distribution, but the former has some clinical pathologic characteristics that are different from the latter. CRC in young people has relatively worse prognosis. The therapeutic effects depend on paying attention to these clinical pathologic characteristics and early diagnosis and early treatment.
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Affiliation(s)
- Zheng-Yong Xie
- Department of General Surgery, Nangfang Hospital, First Military Medical University, Guangzhou 510515, Guangdong Province, China
| | - San-Hua Qing
- Department of General Surgery, Nangfang Hospital, First Military Medical University, Guangzhou 510515, Guangdong Province, China
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Graziano F, Cascinu S. Prognostic molecular markers for planning adjuvant chemotherapy trials in Dukes' B colorectal cancer patients: how much evidence is enough? Ann Oncol 2003; 14:1026-38. [PMID: 12853343 DOI: 10.1093/annonc/mdg284] [Citation(s) in RCA: 97] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
The benefit of postoperative adjuvant chemotherapy in patients with Dukes' B colorectal cancer is still uncertain and its routine use is not recommended. Prognostic biomarkers may be useful for identifying high-risk patients with resected, node-negative disease, and this stratification may represent an innovative strategy for designing adjuvant chemotherapy trials. Featured prognostic molecular markers can be divided into the following categories: cell proliferation indices (Ki-67, Mib-1, proliferating cell nuclear antigen); oncogenes/tumor suppressor genes [p53, K-ras, Deleted in Colorectal Cancer (DCC), Bcl-2, c-erbB2]; DNA repair (microsatellite instability); markers of angiogenesis (vascular count, vascular endothelial growth factor); markers of invasion/metastasis (plasminogen-related molecules, matrix metalloproteinases); and biochemical markers (thymidylate synthase). Studies that have investigated their prognostic role in Dukes' B colorectal cancer patients are reviewed here. Current data do not provide sufficient evidence for the incorporation of available prognostic biomarkers into clinical practice. However, a biomarker-based approach could be an effective strategy for improving results of postoperative adjuvant treatments in high-risk Dukes' B colorectal cancer patients. Markers of altered DCC function have shown promising prognostic role and sufficient prevalence in retrospective investigations and they deserve further assessment in prospective studies.
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Affiliation(s)
- F Graziano
- Medical Oncology Unit, Hospital of Urbino, Urbino, Italy.
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