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Lauricella S, Rausa E, Pellegrini I, Ricci MT, Signoroni S, Palassini E, Cavalcoli F, Pasanisi P, Colombo C, Vitellaro M. Current management of familial adenomatous polyposis. Expert Rev Anticancer Ther 2024; 24:363-377. [PMID: 38785081 DOI: 10.1080/14737140.2024.2344649] [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: 12/01/2023] [Accepted: 04/15/2024] [Indexed: 05/25/2024]
Abstract
INTRODUCTION APC-associated polyposis is a rare hereditary disorder characterized by the development of multiple adenomas in the digestive tract. Individuals with APC-associated polyposis need to be managed by specialized multidisciplinary teams in dedicated centers. AREAS COVERED The study aimed to review the literature on Familial adenomatous polyposis (FAP) to provide an update on diagnostic and surgical management while focusing on strategies to minimize the risk of desmoid-type fibromatosis, cancer in anorectal remnant, and postoperative complications. FAP individuals require a comprehensive approach that includes diagnosis, surveillance, preventive surgery, and addressing specific extracolonic concerns such as duodenal and desmoid tumors. Management should be personalized considering all factors: genotype, phenotype, and personal needs. Total colectomy and ileo-rectal anastomosis have been shown to yield superior QoL results when compared to Restorative Procto colectomy and ileopouch-anal anastomosis with acceptable oncological risk of developing cancer in the rectal stump if patients rigorously adhere to lifelong endoscopic surveillance. Additionally, a low-inflammatory diet may prevent adenomas and cancer by modulating systemic and tissue inflammatory indices. EXPERT OPINION FAP management requires a multidisciplinary and personalized approach. Integrating genetic advances, innovative surveillance techniques, and emerging therapeutic modalities will contribute to improving outcomes and quality of life for FAP individuals.
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Affiliation(s)
- Sara Lauricella
- Hereditary Digestive Tract Tumors Unit, Fondazione IRCCS Istituto Nazionale dei Tumori, Milan, Italy
| | - Emanuele Rausa
- Hereditary Digestive Tract Tumors Unit, Fondazione IRCCS Istituto Nazionale dei Tumori, Milan, Italy
| | - Ilaria Pellegrini
- Medical Oncology Unit, Fondazione IRCCS Istituto Nazionale dei Tumori, Milan, Italy
| | - Maria Teresa Ricci
- Hereditary Digestive Tract Tumors Unit, Fondazione IRCCS Istituto Nazionale dei Tumori, Milan, Italy
| | - Stefano Signoroni
- Hereditary Digestive Tract Tumors Unit, Fondazione IRCCS Istituto Nazionale dei Tumori, Milan, Italy
| | - Elena Palassini
- Medical Oncology Unit, Fondazione IRCCS Istituto Nazionale dei Tumori, Milan, Italy
| | - Federica Cavalcoli
- Gastroenterology and Digestive Endoscopy Unit, Fondazione IRCCS Istituto Nazionale dei Tumori, Milan, Italy
| | - Patrizia Pasanisi
- Nutrition Research and Metabolomics Unit, Fondazione IRCCS Istituto Nazionale dei Tumori, Milan, Italy
| | - Chiara Colombo
- Sarcoma Surgery Unit, Fondazione IRCCS Istituto Nazionale dei Tumori, Milan, Italy
| | - Marco Vitellaro
- Hereditary Digestive Tract Tumors Unit, Fondazione IRCCS Istituto Nazionale dei Tumori, Milan, Italy
- Colorectal Surgery Unit, Fondazione IRCCS Istituto Nazionale dei Tumori, Milan, Italy
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Horton A, Fostier W, Winship I, Rajan N. Facial Features of Hereditary Cancer Predisposition. JCO Oncol Pract 2024:OP2300610. [PMID: 38713892 DOI: 10.1200/op.23.00610] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2023] [Revised: 01/07/2024] [Accepted: 03/26/2024] [Indexed: 05/09/2024] Open
Abstract
In the age of telehealth medicine, an individual's facial features may provide the only physical clues signaling the presence of a heritable cancer predisposition syndrome. These syndromes include APC-associated polyposis, Birt-Hogg-Dubé syndrome, CYLD cutaneous syndrome, hereditary leiomyomatosis and renal cell cancer, multiple endocrine neoplasia, neurofibromatosis type 1, Peutz-Jeghers syndrome, PTEN hamartoma tumor syndrome, and tuberous sclerosis complex 1 and 2, among others. Correctly identifying characteristic features is important for genetic and nongenetic specialists as early detection can enable prompt intervention, improving patient outcomes. Advancements in the availability of genetic testing allow patients and their relatives to have more information about their genetic risk profile than before. These changes in clinical pathways, combined with improvements in screening and risk-reducing treatment, highlight the need to outline the cutaneous and morphologic features of high-risk cancer syndromes for clinicians. In this review, we describe the important facial features of hereditary cancer predisposition, with emphasis on diagnosis, cutaneous and extracutaneous manifestations, and screening.
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Affiliation(s)
- Ari Horton
- Genomic Medicine and Parkville Familial Cancer Centre, Royal Melbourne Hospital, Parkville, Victoria, Australia
| | - William Fostier
- Translational and Clinical Research Institute, Newcastle University, Newcastle upon Tyne, United Kingdom
| | - Ingrid Winship
- Genomic Medicine and Parkville Familial Cancer Centre, Royal Melbourne Hospital, Parkville, Victoria, Australia
- Department of Medicine, The University of Melbourne, Parkville, Victoria, Australia
| | - Neil Rajan
- Translational and Clinical Research Institute, Newcastle University, Newcastle upon Tyne, United Kingdom
- Department of Dermatology, Royal Victoria Infirmary, Newcastle upon Tyne, United Kingdom
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3
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Yin X, Richardson M, Laner A, Shi X, Ognedal E, Vasta V, Hansen TVO, Pineda M, Ritter D, den Dunnen JT, Hassanin E, Lyman Lin W, Borras E, Krahn K, Nordling M, Martins A, Mahmood K, Nadeau EAW, Beshay V, Tops C, Genuardi M, Pesaran T, Frayling IM, Capellá G, Latchford A, Tavtigian SV, Maj C, Plon SE, Greenblatt MS, Macrae FA, Spier I, Aretz S. Systematic large-scale application of ClinGen InSiGHT APC -specific ACMG/AMP variant classification criteria substantially alleviates the burden of variants of uncertain significance in ClinVar and LOVD databases. MEDRXIV : THE PREPRINT SERVER FOR HEALTH SCIENCES 2024:2024.05.03.24306761. [PMID: 38746299 PMCID: PMC11092726 DOI: 10.1101/2024.05.03.24306761] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/16/2024]
Abstract
Background Pathogenic constitutional APC variants underlie familial adenomatous polyposis, the most common hereditary gastrointestinal polyposis syndrome. To improve variant classification and resolve the interpretative challenges of variants of uncertain significance (VUS), APC-specific ACMG/AMP variant classification criteria were developed by the ClinGen-InSiGHT Hereditary Colorectal Cancer/Polyposis Variant Curation Expert Panel (VCEP). Methods A streamlined algorithm using the APC -specific criteria was developed and applied to assess all APC variants in ClinVar and the InSiGHT international reference APC LOVD variant database. Results A total of 10,228 unique APC variants were analysed. Among the ClinVar and LOVD variants with an initial classification of (Likely) Benign or (Likely) Pathogenic, 94% and 96% remained in their original categories, respectively. In contrast, 41% ClinVar and 61% LOVD VUS were reclassified into clinically actionable classes, the vast majority as (Likely) Benign. The total number of VUS was reduced by 37%. In 21 out of 36 (58%) promising APC variants that remained VUS despite evidence for pathogenicity, a data mining-driven work-up allowed their reclassification as (Likely) Pathogenic. Conclusions The application of APC -specific criteria substantially reduced the number of VUS in ClinVar and LOVD. The study also demonstrated the feasibility of a systematic approach to variant classification in large datasets, which might serve as a generalisable model for other gene-/disease-specific variant interpretation initiatives. It also allowed for the prioritization of VUS that will benefit from in-depth evidence collection. This subset of APC variants was approved by the VCEP and made publicly available through ClinVar and LOVD for widespread clinical use.
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4
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Komeda Y, Ishikawa H, Yoshida T, Ushiama M, Yoshida S, Nomura K, Kono M, Omoto S, Takenaka M, Hagiwara S, Kashida H, Kudo M. Familial Adenomatous Polyposis with Atypical Clinical Morphology and Genetic Variants. Intern Med 2024; 63:1075-1079. [PMID: 37558482 PMCID: PMC11081906 DOI: 10.2169/internalmedicine.2050-23] [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] [Received: 03/30/2023] [Accepted: 07/02/2023] [Indexed: 08/11/2023] Open
Abstract
Familial adenomatous polyposis (FAP) is caused by pathogenic variants of the APC gene on the long arm of chromosome 5. An analysis showed an association between germline APC gene variants and clinical signs of FAP; however, attenuated FAP has also been reported in cases with pathogenic variants. In contrast, a phenotype of FAP with no APC germline pathogenic variant and with few signs has been reported. We herein report a 16-year-old girl in whom the presence of multiple large bowel cancers from a young age and several small bowel cancers reflected a carcinogenic tendency higher than that typical for FAP.
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Affiliation(s)
- Yoriaki Komeda
- Department of Gastroenterology and Hepatology, Kindai University Faculty of Medicine, Japan
| | - Hideki Ishikawa
- Department of Molecular-Targeting Prevention, Kyoto Prefectural University of Medicine, Japan
| | - Teruhiko Yoshida
- Department of Genetic Medicine and Services, National Cancer Center Hospital, Japan
- Department of Clinical Genomics, National Cancer Center Research Institute, Japan
| | - Mineko Ushiama
- Department of Genetic Medicine and Services, National Cancer Center Hospital, Japan
- Department of Clinical Genomics, National Cancer Center Research Institute, Japan
| | - Saki Yoshida
- Department of Gastroenterology and Hepatology, Kindai University Faculty of Medicine, Japan
| | - Kenji Nomura
- Department of Gastroenterology and Hepatology, Kindai University Faculty of Medicine, Japan
| | - Masashi Kono
- Department of Gastroenterology and Hepatology, Kindai University Faculty of Medicine, Japan
| | - Shunsuke Omoto
- Department of Gastroenterology and Hepatology, Kindai University Faculty of Medicine, Japan
| | - Mamoru Takenaka
- Department of Gastroenterology and Hepatology, Kindai University Faculty of Medicine, Japan
| | - Satoru Hagiwara
- Department of Gastroenterology and Hepatology, Kindai University Faculty of Medicine, Japan
| | - Hiroshi Kashida
- Department of Gastroenterology and Hepatology, Kindai University Faculty of Medicine, Japan
| | - Masatoshi Kudo
- Department of Gastroenterology and Hepatology, Kindai University Faculty of Medicine, Japan
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Tanabe H, Ijiri M, Takahashi K, Sasagawa H, Kamanaka T, Kuroda S, Sato H, Sarashina T, Mizukami Y, Makita Y, Okumura T. Genomic insights into familial adenomatous polyposis: unraveling a rare case with whole APC gene deletion and intellectual disability. Hum Genome Var 2024; 11:13. [PMID: 38548799 PMCID: PMC10978947 DOI: 10.1038/s41439-024-00270-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2023] [Revised: 01/05/2024] [Accepted: 01/09/2024] [Indexed: 04/01/2024] Open
Abstract
A young patient diagnosed with advanced colon cancer and liver metastasis was found to have familial adenomatous polyposis (FAP) through comprehensive genomic analysis. Whole-genome array comparative genomic hybridization (aCGH) revealed germline deletions at chromosome 5q22.1-22.2 encompassing the entire APC gene. The patient and her son exhibited mild intellectual disability without developmental delay. This case highlights the need for further exploration of the characteristics associated with whole APC deletions. aCGH is a valuable tool for studying FAP and provides a detailed analysis of large deletions.
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Affiliation(s)
- Hiroki Tanabe
- Oncology Center, Asahikawa Medical University Hospital, Asahikawa, Japan.
- Genetic Oncology Department, Asahikawa Medical University Hospital, Asahikawa, Japan.
- Department of Genetic Counseling, Asahikawa Medical University Hospital, Asahikawa, Japan.
| | - Masami Ijiri
- Department of Gastroenterology, Japanese Red Cross Asahikawa Hospital, Asahikawa, Japan
| | - Kenji Takahashi
- Genetic Oncology Department, Asahikawa Medical University Hospital, Asahikawa, Japan
- Department of Internal Medicine, Asahikawa Medical University, Asahikawa, Japan
| | - Honoka Sasagawa
- Department of Genetic Counseling, Asahikawa Medical University Hospital, Asahikawa, Japan
| | - Tomomi Kamanaka
- Oncology Center, Asahikawa Medical University Hospital, Asahikawa, Japan
| | - Shohei Kuroda
- Department of Gastroenterology, Japanese Red Cross Asahikawa Hospital, Asahikawa, Japan
| | - Hiroki Sato
- Department of Internal Medicine, Asahikawa Medical University, Asahikawa, Japan
| | - Takeo Sarashina
- Oncology Center, Asahikawa Medical University Hospital, Asahikawa, Japan
| | - Yusuke Mizukami
- Genetic Oncology Department, Asahikawa Medical University Hospital, Asahikawa, Japan
- Department of Internal Medicine, Asahikawa Medical University, Asahikawa, Japan
| | - Yoshio Makita
- Department of Genetic Counseling, Asahikawa Medical University Hospital, Asahikawa, Japan
| | - Toshikatsu Okumura
- Department of Internal Medicine, Asahikawa Medical University, Asahikawa, Japan
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Mirabdolhosseini SM, Rejali L, Yaghoob Taleghani M, Sadeghi H, Kashfi SMH, Behboudi Farahbakhsh F, Golmohammadi M, Larki P, Fatemi N, Ketabi Moghadam P, Nazemalhosseini Mojarad E, Sadeghi A, Asadzadeh Aghdaie H, Zali MR. An update of the variant spectrum of the APC gene in Iranian familial adenomatous polyposis patients. NUCLEOSIDES, NUCLEOTIDES & NUCLEIC ACIDS 2023; 43:40-56. [PMID: 37405864 DOI: 10.1080/15257770.2023.2229878] [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: 09/04/2022] [Revised: 05/30/2023] [Accepted: 06/21/2023] [Indexed: 07/07/2023]
Abstract
Familial adenomatous polyposis (FAP) is an autosomal dominant colorectal cancer syndrome that is characterized by the development of multiple adenomas in the colon and rectum with high penetrance rates. This disease has specific features like the occurrence of pathogenic variations in the APC gene and diverse FAP phenotypes due to the occurrence region. In this study we aimed to evaluate pathogenic variants in exons of the APC gene in Iranian patients with FAP. A total of 35 FAP individuals were referred to the gastroenterology ward of Taleghani Hospital. As the aim of the study was to study the germline variations in the participants, the peripheral blood was collected and after the DNA extraction, PCR, and Sanger sequencing processes for the APC gene, the results were evaluated by the ACMG classification guidelines to report their pathogenicity. Accordingly, out of eight specific detected variants, three of them were novel, and the rest were reported previously. These eight variants were all truncating protein and pathogenic, and they were limited to 849-1378 codons. Overall, detected variants revealed discrepancies and parallels with previous reported cases in terms of quantity, occurrence region, and association with demographic and clinicopathological characteristics of patients. The spectrum of detected variants and the patient's phenotype showed distinct characteristics, such as occurrence in specific regions and the absence of extracolonic symptoms like Congenital hypertrophy of the retinal pigment epithelium (CHRPE). These findings open the path to comprehending the typical symptoms, their rarity, and their occurrence in the Iranian population and also due to the facts, we found that the studying of the APC gene alone for diagnosing FAP disease is not sufficient, and considering other genes are completely rational in the case of sequencing and studying the variants.
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Affiliation(s)
- Seyed Mohsen Mirabdolhosseini
- Basic and Molecular Epidemiology of Gastrointestinal Disorders Research Centre, Research Institute for Gastroenterology and Liver Diseases, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Leili Rejali
- Basic and Molecular Epidemiology of Gastrointestinal Disorders Research Centre, Research Institute for Gastroenterology and Liver Diseases, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Mohammad Yaghoob Taleghani
- Basic and Molecular Epidemiology of Gastrointestinal Disorders Research Centre, Research Institute for Gastroenterology and Liver Diseases, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Hossein Sadeghi
- Genomic Research Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Seyed Mohammad Hossein Kashfi
- Basic and Molecular Epidemiology of Gastrointestinal Disorders Research Centre, Research Institute for Gastroenterology and Liver Diseases, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Faeghe Behboudi Farahbakhsh
- Basic and Molecular Epidemiology of Gastrointestinal Disorders Research Centre, Research Institute for Gastroenterology and Liver Diseases, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Mina Golmohammadi
- Basic and Molecular Epidemiology of Gastrointestinal Disorders Research Centre, Research Institute for Gastroenterology and Liver Diseases, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Pegah Larki
- Genomic Research Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Nayeralsadat Fatemi
- Basic and Molecular Epidemiology of Gastrointestinal Disorders Research Centre, Research Institute for Gastroenterology and Liver Diseases, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Pardis Ketabi Moghadam
- Basic and Molecular Epidemiology of Gastrointestinal Disorders Research Centre, Research Institute for Gastroenterology and Liver Diseases, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Ehsan Nazemalhosseini Mojarad
- Gastroenterology and Liver Diseases Research Centre, Research Institute for Gastroenterology and Liver Diseases, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Amir Sadeghi
- Gastroenterology and Liver Diseases Research Centre, Research Institute for Gastroenterology and Liver Diseases, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Hamid Asadzadeh Aghdaie
- Basic and Molecular Epidemiology of Gastrointestinal Disorders Research Centre, Research Institute for Gastroenterology and Liver Diseases, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Mohammad Reza Zali
- Gastroenterology and Liver Diseases Research Centre, Research Institute for Gastroenterology and Liver Diseases, Shahid Beheshti University of Medical Sciences, Tehran, Iran
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7
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Oncotherapeutic Strategies in Early Onset Colorectal Cancer. Cancers (Basel) 2023; 15:cancers15020552. [PMID: 36672501 PMCID: PMC9856676 DOI: 10.3390/cancers15020552] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2022] [Revised: 01/09/2023] [Accepted: 01/10/2023] [Indexed: 01/18/2023] Open
Abstract
Early onset colorectal cancer (EOCRC), defined as colorectal cancers in patients aged less than 50 years, is becoming an increasingly common issue, globally. Since 1994, the incidence of this condition has been rising by 2% annually. Approximately one in five patients under 50 years of age diagnosed with colorectal cancer have an underlying genetic predisposition syndrome. The detection of cancer among the other 80% of patients poses a considerable task, as there is no family history to advocate for commencing early screening in this group. Patients with EOCRC have distinct social, spiritual, fertility, and financial needs from their older counterparts that need to be addressed. This review discusses the risk factors associated with the development of EOCRC and current best practice for the management of this disease.
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8
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Feldman D, Rodgers-Fouche L, Hicks S, Chung DC. Clinical features and long-term outcomes of patients with colonic oligopolyposis of unknown etiology. World J Gastroenterol 2022; 28:6950-6961. [PMID: 36632322 PMCID: PMC9827588 DOI: 10.3748/wjg.v28.i48.6950] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/02/2022] [Revised: 11/14/2022] [Accepted: 12/13/2022] [Indexed: 12/26/2022] Open
Abstract
BACKGROUND Colonic adenomatous polyposis of unknown etiology (CPUE) is an adenomatous polyposis phenotype that resembles Familial Adenomatous Polyposis (FAP) even though no germline pathogenic variant is identified.
AIM We sought to better characterize the clinical features and outcomes in a cohort of CPUE patients.
METHODS This is a retrospective case series of patients 18 years old or older with aden-omatous oligopolyposis (between 10-100 adenomas) and negative genetic testing, identified through the Hereditary Gastrointestinal Cancer Database at Massachusetts General Hospital, a tertiary academic referral center. A retrospective chart review was performed with a focus on demographics, alcohol and tobacco use, medication use, familial malignancy and polyp burden, genetic testing information, endoscopic surveillance data including the corresponding histopathology, colonic and extracolonic malignancies, mortality events, and their etiology. Spearman correlation and Pearson Chi-square test (or Fisher's exact test) were used for continuous and categorical variables respectively.
RESULTS CPUE patients were primarily male (69%) and presented for genetic counseling at 63.7 years. Only 2 patients (2.9%) reported a first-degree relative with polyposis. During an average surveillance period of 12.3 years, 0.5 colonoscopies per year were performed. Patients developed 2.3 new adenomas per year. 4 (5.7%) were diagnosed with colorectal cancer (CRC) at a mean age of 66 years, and 3 were diagnosed prior to the onset of oligopolyposis. 7 (10%) required colectomy due to advanced dysplasia or polyp burden. With respect to upper gastrointestinal manifestations, 1 patient had a gastric adenoma, but there were no cases of gastric or small bowel polyposis. During surveillance, 10 (14%) patients died at a mean age of 72, and none were due to CRC.
CONCLUSION CPUE is distinct from familial adenomatous polyposis (FAP) syndrome and the use of FAP surveillance guidelines may result in unnecessarily frequent upper and lower endoscopies.
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Affiliation(s)
- Dan Feldman
- Division of Gastroenterology, Massachusetts General Hospital, Boston, Massachusetts 02114, United States
| | - Linda Rodgers-Fouche
- Center for Cancer Risk Assessment, Massachusetts General Hospital, Boston, Massachusetts 02114, United States
| | - Stephanie Hicks
- Center for Cancer Risk Assessment, Massachusetts General Hospital, Boston, Massachusetts 02114, United States
| | - Daniel C Chung
- Division of Gastroenterology and Center for Cancer Risk Assessment, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts 02114, United States
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9
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Takane K, Fukuyo M, Matsusaka K, Ota S, Rahmutulla B, Matsushita K, Miyauchi H, Nakatani Y, Matsubara H, Kaneda A. The frequency of promoter DNA hypermethylation is decreased in colorectal neoplasms of familial adenomatous polyposis. Oncotarget 2018; 9:32653-32666. [PMID: 30220972 PMCID: PMC6135695 DOI: 10.18632/oncotarget.25987] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2018] [Accepted: 07/31/2018] [Indexed: 12/16/2022] Open
Abstract
Familial adenomatous polyposis (FAP) is an inherited disorder characterized by numerous colorectal adenomatous polyps with predisposition to the development of colorectal cancer (CRC). Here, we conducted genome-wide DNA methylation analysis of FAP neoplasms, including seven cancer samples and 16 adenoma samples, using an Infinium 450K BeadArray. As controls for sporadic colorectal neoplasms and mucosae, we used Infinium 450k data from 297 CRC samples, 45 colorectal adenoma samples, and 37 normal mucosa samples with reference to The Cancer Genome Atlas and other databases. Unsupervised two-way hierarchical clustering analysis of FAP and sporadic CRC/adenoma revealed that CRC was classified into four DNA methylation epigenotypes (MEs): high-ME (HME), intermediate-ME (IME), low-ME (LME), and normal-like ME (NME). Five FAP neoplasms (two cancer and three adenoma) were clustered with IME, whereas 18 FAP neoplasms (five cancer and 13 adenoma) were clustered into NME. IME FAP neoplasms significantly correlated with KRAS mutations, similar to sporadic CRC. Within IME cases, however, aberrant DNA methylation was significantly less frequent in FAP neoplasms than sporadic neoplasms, and these unmethylated genes included WNT family genes and several types of oncogenes. In summary, FAP neoplasms were classified into at least two molecular subtypes, i.e., NME in the majority of cases showing mostly no aberrant methylation and IME in some cases accompanied by KRAS mutations but less frequent aberrant DNA methylation than sporadic neoplasms, suggesting that FAP may follow a tumorigenesis pathway different from that of sporadic CRC.
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Affiliation(s)
- Kiyoko Takane
- Department of Molecular Oncology, Graduate School of Medicine, Chiba University, Chiba, Japan
| | - Masaki Fukuyo
- Department of Molecular Oncology, Graduate School of Medicine, Chiba University, Chiba, Japan.,Department of Genome Research and Development, Kazusa DNA Research Institute, Chiba, Japan
| | - Keisuke Matsusaka
- Department of Molecular Oncology, Graduate School of Medicine, Chiba University, Chiba, Japan
| | - Satoshi Ota
- Department of Pathology, Chiba University Hospital, Chiba, Japan
| | - Bahityar Rahmutulla
- Department of Molecular Oncology, Graduate School of Medicine, Chiba University, Chiba, Japan
| | - Kazuyuki Matsushita
- Department of Laboratory Medicine and Division of Clinical Genetics and Proteomics, Chiba University Hospital, Chiba, Japan
| | - Hideaki Miyauchi
- Department of Frontier Surgery, and Graduate School of Medicine, Chiba University, Chiba, Japan
| | - Yukio Nakatani
- Department of Pathology, Chiba University Hospital, Chiba, Japan.,Department of Diagnostic Pathology, Graduate School of Medicine, Chiba University, Chiba, Japan
| | - Hisahiro Matsubara
- Department of Frontier Surgery, and Graduate School of Medicine, Chiba University, Chiba, Japan
| | - Atsushi Kaneda
- Department of Molecular Oncology, Graduate School of Medicine, Chiba University, Chiba, Japan
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10
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Takane K, Matsusaka K, Ota S, Fukuyo M, Yue Y, Nishimura M, Sakai E, Matsushita K, Miyauchi H, Aburatani H, Nakatani Y, Takayama T, Matsubara H, Akagi K, Kaneda A. Two subtypes of colorectal tumor with distinct molecular features in familial adenomatous polyposis. Oncotarget 2018; 7:84003-84016. [PMID: 27563825 PMCID: PMC5356641 DOI: 10.18632/oncotarget.11510] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2016] [Accepted: 08/17/2016] [Indexed: 12/30/2022] Open
Abstract
While sporadic colorectal cancer (CRC) is classified into several molecular subtypes, stratification of familial colorectal tumors is yet to be well investigated. We previously established two groups of methylation markers through genome-wide DNA methylation analysis, which classified sporadic CRC and adenoma into three distinct subgroups: high-, intermediate-, and low-methylation epigenotypes. Here, we investigated familial adenomatous polyposis (FAP), through quantitative methylation analysis of 127 samples (16 cancers, 96 adenomas, and 15 benign mucosa from 14 patients with FAP) using six Group-1 and 14 Group-2 methylation markers, APC, BRAF, and KRAS mutation analysis, and CTNNB1 and TP53 immunohistochemical analysis. All the 14 patients presented with APC germline mutation. Three were from the same family and presented the same APC mutation. FAP tumors lacked BRAF-mutation(+) high-methylation epigenotype and were classified into two methylation epigenotypes. While 24 of 112 tumor samples showed intermediate-methylation epigenotype significantly correlating with KRAS-mutation(+) (P=3×10-4), 88 tumor samples showed low-methylation epigenotype correlating with the absence of KRAS- and BRAF-mutations. Similar to sporadic CRC, CTNNB1 was frequently activated at the adenoma stage, and TP53 mutation occurred during cancer development from adenoma. Whereas some patients showed a single epigenotype in all tumors throughout the colon, tumors with two distinct epigenotypes developed within a family with the same APC mutation or even within one patient. Methylation accumulation significantly correlated with proximal location and older age. These results indicate that there are at least two distinct molecular subtypes of FAP tumors, resembling sporadic CRC and independent from the APC germline mutation status.
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Affiliation(s)
- Kiyoko Takane
- Department of Molecular Oncology, Graduate School of Medicine, Chiba University, Chiba, Japan.,Department of Digestive Surgery, Nihon University School of Medicine, Tokyo, Japan
| | - Keisuke Matsusaka
- Department of Molecular Oncology, Graduate School of Medicine, Chiba University, Chiba, Japan
| | - Satoshi Ota
- Department of Pathology, Chiba University Hospital, Chiba, Japan
| | - Masaki Fukuyo
- Department of Molecular Oncology, Graduate School of Medicine, Chiba University, Chiba, Japan
| | - Yao Yue
- Department of Molecular Diagnosis, Graduate School of Medicine, Chiba University, Chiba, Japan
| | - Motoi Nishimura
- Department of Molecular Diagnosis, Graduate School of Medicine, Chiba University, Chiba, Japan
| | - Eiji Sakai
- Department of Molecular Oncology, Graduate School of Medicine, Chiba University, Chiba, Japan.,Department of Gastroenterology, Yokohama City University School of Medicine, Yokohama, Japan
| | - Kazuyuki Matsushita
- Department of Molecular Diagnosis, Graduate School of Medicine, Chiba University, Chiba, Japan
| | - Hideaki Miyauchi
- Department of Frontier Surgery, Graduate School of Medicine, Chiba University, Chiba, Japan
| | - Hiroyuki Aburatani
- Genome Science Division, Research Center for Advanced Science and Technology, The University of Tokyo, Tokyo, Japan
| | - Yukio Nakatani
- Department of Pathology, Chiba University Hospital, Chiba, Japan.,Department of Diagnostic Pathology, Graduate School of Medicine, Chiba University, Chiba, Japan
| | - Tadatoshi Takayama
- Department of Digestive Surgery, Nihon University School of Medicine, Tokyo, Japan
| | - Hisahiro Matsubara
- Department of Frontier Surgery, Graduate School of Medicine, Chiba University, Chiba, Japan
| | - Kiwamu Akagi
- Division of Molecular Diagnosis, Saitama Cancer Center, Saitama, Japan
| | - Atsushi Kaneda
- Department of Molecular Oncology, Graduate School of Medicine, Chiba University, Chiba, Japan.,Genome Science Division, Research Center for Advanced Science and Technology, The University of Tokyo, Tokyo, Japan
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11
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Hawkins AT, Wise PE. Colon cancer in hereditary syndromes. SEMINARS IN COLON AND RECTAL SURGERY 2016. [DOI: 10.1053/j.scrs.2016.04.021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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12
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Lin PL, Wu DW, Huang CC, He TY, Chou MC, Sheu GT, Lee H. MicroRNA-21 promotes tumour malignancy via increased nuclear translocation of β-catenin and predicts poor outcome in APC-mutated but not in APC-wild-type colorectal cancer. Carcinogenesis 2014; 35:2175-82. [PMID: 24832083 DOI: 10.1093/carcin/bgu110] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
MiR-21 has been associated with poor prognosis in colon adenocarcinomas. However, in our preliminary data, the prognostic value of miR-21 levels was observed only in adenomatous polyposis coli (APC)-mutated tumours, not in APC-wild-type tumours. We explored whether β-catenin nuclear translocation was synergistically promoted by miR-21 in APC-mutated cells but not in APC-wild-type cells. We enrolled 165 colorectal tumour to determine APC mutation, miR-21 levels and nuclear β-catenin expression by direct sequencing, real-time PCR and immunohistochemistry. Overall survival and relapse-free survival were analysed by Kaplan-Meier and Cox regression models. The mechanistic action of β-catenin nuclear translocation modulated by miR-21 and its effect on cell invasion were evaluated in a cell model. Positive nuclear β-catenin expression was more commonly occurred in APC-mutated tumours than in APC-wild-type tumours. High miR-21 levels were relatively more common in tumours with positive nuclear β-catenin expression than in those with negative nuclear β-catenin expression. APC-mutated tumours with high miR-21 levels had shorter overall survival and relapse-free survival periods compared with others. However, the prognostic value of miR-21 levels was not observed in APC-wild-type tumours. Phosphorylation of β-catenin at Ser552 via the miR-21-mediated PTEN/AKT axis plays a critical role in β-catenin nuclear translocation in APC-mutated cells but not in APC-wild-type cells. Moreover, nuclear β-catenin expression increased by miR-21 is responsible for the capability of invasiveness. In summary, nuclear translocation of β-catenin increased by miR-21 promotes tumour malignancy and a poor outcome in APC-mutated patients but not in APC-wild-type colorectal cancer.
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Affiliation(s)
- Po-Lin Lin
- Institute of Medicine, College of Medicine, Chung Shan Medical University, Taichung 402, Taiwan
| | - De-Wei Wu
- Graduate Institute of Cancer Biology and Drug Discovery, College of Medical Science and Technology, Taipei Medical University, Taipei 115, Taiwan
| | - Chi-Chou Huang
- Department of Medicine, Chung Shan Medical University, Taichung 402, Taiwan and Department of Surgery, Chung Shan Medical University Hospital, Taichung 402, Taiwan
| | - Tsung-Ying He
- Institute of Medicine, College of Medicine, Chung Shan Medical University, Taichung 402, Taiwan
| | - Ming-Chih Chou
- Institute of Medicine, College of Medicine, Chung Shan Medical University, Taichung 402, Taiwan, Department of Medicine, Chung Shan Medical University, Taichung 402, Taiwan and Department of Surgery, Chung Shan Medical University Hospital, Taichung 402, Taiwan
| | - Gwo-Tarng Sheu
- Institute of Medicine, College of Medicine, Chung Shan Medical University, Taichung 402, Taiwan
| | - Huei Lee
- Graduate Institute of Cancer Biology and Drug Discovery, College of Medical Science and Technology, Taipei Medical University, Taipei 115, Taiwan,
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13
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Hes FJ, Ruano D, Nieuwenhuis M, Tops CM, Schrumpf M, Nielsen M, Huijts PEA, Wijnen JT, Wagner A, Gómez García EB, Sijmons RH, Menko FH, Letteboer TGW, Hoogerbrugge N, Harryvan J, Kampman E, Morreau H, Vasen HFA, van Wezel T. Colorectal cancer risk variants on 11q23 and 15q13 are associated with unexplained adenomatous polyposis. J Med Genet 2013; 51:55-60. [PMID: 24253443 DOI: 10.1136/jmedgenet-2013-102000] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
BACKGROUND Colorectal adenomatous polyposis is associated with a high risk of colorectal cancer (CRC) and is frequently caused by germline mutations in APC or MUTYH. However, in about 20-30% of patients no underlying gene defect can be identified. In this study, we tested if recently identified CRC risk variants play a role in patients with >10 adenomas. METHODS We analysed a total of 16 SNPs with a reported association with CRC in a cohort of 252 genetically unexplained index patients with >10 colorectal adenomas and 745 controls. In addition, we collected detailed clinical information from index patients and their first-degree relatives (FDRs). RESULTS We found a statistically significant association with two of the variants tested: rs3802842 (at chromosome 11q23, OR=1.60, 95% CI 1.3 to 2.0) and rs4779584 (at chromosome 15q13, OR=1.50, 95% CI 1.2 to 1.9). The majority of index patients (84%) had between 10 and 100 adenomas and 15% had >100 adenomas. Only two index patients (1%), both with >100 adenomas, had FDRs with polyposis. Forty-one per cent of the index patients had one or more FDRs with CRC. CONCLUSIONS These SNPs are the first common, low-penetrant variants reported to be associated with adenomatous polyposis not caused by a defect in the APC, MUTYH, POLD1 and POLE genes. Even though familial occurrence of polyposis was very rare, CRC was over-represented in FDRs of polyposis patients and, if confirmed, these relatives will therefore benefit from surveillance.
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Affiliation(s)
- Frederik J Hes
- Department of Clinical Genetics, Leiden University Medical Center, Leiden, The Netherlands
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14
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Erkrankungen und Therapieformen des unteren Gastrointestinaltrakts. PÄDIATRISCHE GASTROENTEROLOGIE, HEPATOLOGIE UND ERNÄHRUNG 2013. [PMCID: PMC7498818 DOI: 10.1007/978-3-642-24710-1_10] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
Duodenalatresien sind Hemmungsfehlbildungen und können proximal oder distal der Papilla Vateri entstehen, wobei die präpapillären Obstruktionen selten sind. Grundsätzlich kann zwischen einer Membranatresie und einer Defektatresie unterschieden werden. Die Unterscheidung beruht nicht nur auf embryologischen Gesichtspunkten, sondern hat auch eine klinische Bedeutung: Bei der Membranatresie kann die quergestellte, partiell offene oder geschlossene Membran weit in den distalen Duodenalanteil reichen („Windsackphänomen“), was zu diagnostischen und auch intraoperativen Problemen führen kann. Ein Pancreas anulare findet sich bei etwa 20 % aller Patienten mit Duodenalatresie.
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15
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Morak M, Laner A, Bacher U, Keiling C, Holinski-Feder E. MUTYH-associated polyposis - variability of the clinical phenotype in patients with biallelic and monoallelic MUTYH mutations and report on novel mutations. Clin Genet 2011; 78:353-63. [PMID: 20618354 DOI: 10.1111/j.1399-0004.2010.01478.x] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
To further characterize 215 APC mutation-negative patients with colorectal neoplasias classified in classical, attenuated, or atypical familial adenomatous polyposis (FAP) coli we performed mutation screening in the Mut Y homologue (MUTYH) gene. The incidence was 15% for biallelic and 3.7% for monoallelic MUTYH mutations. We describe six novel MUTYH mutations in biallelic constellation and two novel monoallelic missense mutations. Of 33 MUTYH-associated polyposis coli (MAP) patients 57% were attenuated familial adenomatous polyposis (AFAP) patients, 10% display early-onset classical FAP and 18% had only few adenomas at higher age. Biallelic cases had a high incidence of extracolonic polyposis in 32% and colorectal cancer (CRC) in 33% of the cases. The clinical picture of MAP ranged from classical FAP or synchronous CRC at age 30 years to few adenomas at age 54 years without evidence of CRC, initially suspected for hereditary non-polyposis colorectal cancer (HNPCC). The mean age of onset was 43 years, with 11 (33%) patients being younger than 40 years of age, indicating that the clinical manifestation can be earlier than so far reported. Monoallelic MUTYH mutation carriers had a positive family history in seven of eight cases allowing the hypothesis of a disease-causing synergism of MUTYH mutations with other genes.
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Affiliation(s)
- M Morak
- University Hospital of the Ludwig-Maximilians-University, Campus Innenstadt, Munich, Germany
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16
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Uckun FM, Dibirdik I. Chemoprevention of Colorectal Cancer by Targeting Janus Kinase 3 With a Rationally Designed Small Molecule Inhibitor. Nutr Cancer 2010; 62:968-72. [DOI: 10.1080/01635581.2010.513471] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
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17
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Pezzi A, Roncucci L, Benatti P, Sassatelli R, Varesco L, Di Gregorio C, Venesio T, Pedroni M, Maffei S, Reggiani Bonetti L, Borsi E, Ferrari M, Martella P, Rossi G, Ponz De Leon M. Relative role of APC and MUTYH mutations in the pathogenesis of familial adenomatous polyposis. Scand J Gastroenterol 2010; 44:1092-100. [PMID: 19593690 DOI: 10.1080/00365520903100481] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
OBJECTIVE Familial adenomatous polyposis (FAP) is an interesting model for the study of colorectal tumour. Two genes contribute to the FAP phenotype - APC and MUTYH - but their relative role is still undefined. The objective of this study was to evaluate the contribution of the two genes to the pathogenesis of FAP by means of a series of FAP families. MATERIAL AND METHODS Sixty-one unrelated families with a diagnosis of FAP and a total of 187 affected individuals were evaluated. After extracting DNA, APC and MUTYH genes were sequenced. RESULTS In the whole series of patients, colectomy with ileorectal anastomosis was the most frequent surgery, although the number of patients treated by total proctocolectomy and ileoanal anastomosis was increasing. Duodenal and jejunal-ileal adenomas were present in more than half of the patients. Constitutional mutations were detected in 37 of the 45 families (82.2%); there were 33 families with APC and 4 with MUTYH alterations. Age at onset of polyposis and age at surgery were 10-15 years delayed for carriers of MUTYH mutations; cancer at diagnosis was frequent, and extracolonic manifestations were diagnosed in the majority of MUTYH-positive families. MUTYH-associated polyposis showed the horizontal transmission expected for recessive inheritance (at variance with the dominant pattern seen with APC mutations). CONCLUSIONS At least two genes are associated with the FAP phenotype. APC mutations account for the majority of cases, while MUTYH mutations can be observed in 10% of patients. There are few but definite differences between APC- and MUTYH-associated FAP, such as age at diagnosis and pattern of transmission.
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Affiliation(s)
- Annalisa Pezzi
- Department of Internal Medicine, University of Modena and Reggio Emilia, Modena, Italy
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Chiang JM, Chen HW, Tang RP, Chen JS, Changchien CR, Hsieh PS, Wang JY. Mutation analysis of the APC gene in Taiwanese FAP families: low incidence of APC germline mutation in a distinct subgroup of FAP families. Fam Cancer 2009; 9:117-24. [PMID: 19768578 DOI: 10.1007/s10689-009-9292-2] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2008] [Accepted: 08/29/2009] [Indexed: 12/24/2022]
Abstract
Familial adenomatous polyposis (FAP) is an autosomal-dominant disease caused by germline mutations in the adenomatous polyposis coli (APC) gene. The affected individuals develop colorectal polyposis and show various extra-colonic manifestations. In this study, we aimed to investigate the genetic and clinical characteristics of FAP in Taiwanese families and analyze the genotype-phenotype correlations. Blood samples were obtained from 66 FAP patients registered in the hereditary colorectal cancer database. Then, germline mutations in the APC genes of these 66 polyposis patients from 47 unrelated FAP families were analyzed. The germline-mutation-negative cases were analyzed by performing multiplex ligation-dependent probe amplification (MLPA) and single-strand conformation polymorphism (SSCP) analysis of the MUTYH gene. Among the analyzed families, 79% (37/47) of the families showed 28 APC mutations, including 19 frameshift mutations, 4 nonsense mutations, 3 genomic deletion mutations, 1 missense mutation, and 1 splice-site mutation. In addition, we identified 15 novel mutations in 32% (15/47) of the families. The cases in which APC mutations were not identified showed significantly lower incidence of profuse polyposis (P = 0.034) and gastroduodenal polyps (P = 0.027). Furthermore, FAP families in which some affected individuals had less than 100 polyps showed significant association with low incidence of APC germline mutations (P = 0.002). We have added the APC germline-mutation data for Taiwanese FAP patients and indicated the presence of an FAP subgroup comprising affected individuals with nonadenomatous polyps or less than 100 adenomatous polyps; this form of FAP is less frequently caused by germline mutations of the APC gene.
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Affiliation(s)
- J M Chiang
- Division of Colon and Rectal Surgery, Chang Gung Memorial Hospital, Lin-kou, Taiwan.
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Bougatef K, Krichene A, Marrakchi R, Kourda N, Blondeau Lahely Y, Moussa A, Troudi W, Jileni SB, Najjar T, Soubrier F, Ammar Elgaaied AB. Do we know all there is to know about Familial Adenomatous Polyposis? GASTROENTEROLOGIE CLINIQUE ET BIOLOGIQUE 2007; 31:1062-1066. [PMID: 18176357 DOI: 10.1016/s0399-8320(07)78335-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Familial Adenomatous Polyposis (FAP) and Attenuated FAP (AFAP) are caused by a germline mutation in the Adenomatous polyposis coli (APC) gene. Recently, a new pathway characterized by a biallelic mutation in the MYH gene, with a recessive model of inheritance was discovered for this inherited syndrome. This report describes a Tunisian patient with an attenuated FAP phenotype, presenting seven colon polyps and an adenocarcinoma but no detectable germline mutations in the FAP target genes. A well known somatic mutation was found in the APC mutation cluster region (MCR). This case shows that further studies are needed to fully understand all the pathways of the FAP syndrome.
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Affiliation(s)
- Karim Bougatef
- Laboratoire de génétique, immunologie et pathologies humaines, Faculté des sciences de Tunis, Campus universitaire, Tunis, Tunisie.
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20
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Cao X, Hong Y, Eu KW, Loi C, Cheah PY. Singapore familial adenomatous polyposis (FAP) patients with classical adenomatous polyposis but undetectable APC mutations have accelerated cancer progression. Am J Gastroenterol 2006; 101:2810-7. [PMID: 17026565 DOI: 10.1111/j.1572-0241.2006.00842.x] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
OBJECTIVES Germline mutation in adenomatous polyposis coli (APC) is detected in up to 80% of familial adenomatous polyposis (FAP) patients worldwide. In this study, we evaluated clinical features and APC mutations of Singapore FAP patients and contrasted genotype-phenotype correlation with Caucasians from other regions of the world and between FAP patients with and without detectable APC mutations. METHODS We screened 242 members from 57 unrelated FAP families using a combination of cDNA protein truncation test, multiplex ligation-dependent probe amplification, and differential expression techniques. RESULTS APC germline mutations were detected in 50 families. In contrast to Caucasians, fundic gland polyposis in Singapore patients was associated with APC mutations throughout the coding region and osteomas were also not confined to codon 767-1573. There was also no FAP-associated hepatoblastoma or medullablastoma. APC mutation-negative patients from four families with mixed (adenomatous/hyperplastic/atypical juvenile) polyps were subsequently reclassified as hereditary mixed polyposis syndrome (HMPS) patients. APC mutation-negative patients with classical adenomatous polyposis were negative for MYH, beta-catenin, and Axin 1 mutations. These patients had a significantly older age at diagnosis (P < 0.001) and more colorectal cancers (P= 0.017) than patients with APC mutations. CONCLUSIONS We achieved a 94% (50/53) APC mutation detection rate via a combination of techniques, suggesting that the current detection rate is probably not exhaustive. Singapore patients have some features similar to and other features distinct from Caucasians. Furthermore, APC mutation-negative patients have accelerated cancer progression that merits closer surveillance.
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Affiliation(s)
- Xia Cao
- Department of Colorectal Surgery, Singapore General Hospital, Singapore
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Bisgaard ML, Bülow S. Familial adenomatous polyposis (FAP): genotype correlation to FAP phenotype with osteomas and sebaceous cysts. Am J Med Genet A 2006; 140:200-4. [PMID: 16411234 DOI: 10.1002/ajmg.a.31010] [Citation(s) in RCA: 52] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Gardner syndrome is characterized by the triad of colorectal adenomas, soft and hard tissue tumors. This disorder was regarded as a separate disease until the identification of the APC gene when it was recognized that mutations in the APC gene were the underlying cause of both Gardner syndrome and familial adenomatous polyposis (FAP). The present study aimed at examining whether a particular APC genotype could be delineated in FAP patients with benign extracolonic manifestations: sebaceous cysts and/or osteomas. A questionnaire was sent to all Danish FAP patients (N = 234) asking for occurrence of sebaceous cysts and palpable osteomas. Medical records later verified positive findings, when possible. The results for each patient were correlated to the position of his or her mutation in the APC gene. Positive participation compliance was 77% (N = 180), and in 105 of these patients the pathogenic APC mutation was known. Palpable osteomas were reported in 17 of the patients in whom a pathogenic mutation had been identified. Osteomas were only identified in patients with mutations between codon 767 and 1513, a gene area also associated with congenital hypertrophy of the retinal-pigmented epithelium (CHRPE) and hepatoblastoma. Sebaceous cysts were reported in 51% of the patients, and their APC mutations were evenly distributed in the gene with no particular hotspot. Osteomas appeared most frequently in patients with sebaceous cysts, odds ratio 6.6, P < 0.001. The study provides molecular evidence that Gardner syndrome is a variant of FAP and essentially obsolete in clinical practice.
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Affiliation(s)
- Marie Luise Bisgaard
- Institute of Medical Biochemistry and Genetics, Department G, Copenhagen University, Panum Institute 24.4, Copenhagen N, Denmark
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Renkonen ET, Nieminen P, Abdel-Rahman WM, Moisio AL, Järvelä I, Arte S, Järvinen HJ, Peltomäki P. Adenomatous polyposis families that screen APC mutation-negative by conventional methods are genetically heterogeneous. J Clin Oncol 2005; 23:5651-9. [PMID: 16110024 DOI: 10.1200/jco.2005.14.712] [Citation(s) in RCA: 63] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
PURPOSE One third of families with classical adenomatous polyposis (FAP), and a majority of those with attenuated FAP (AFAP), remain APC mutation-negative by conventional methods. Our purpose was to clarify the genetic basis of polyposis and genotype-phenotype correlations in such families. PATIENTS AND METHODS We studied a cohort of 29 adenomatous polyposis families that had screened APC mutation-negative by the protein truncation test, heteroduplex analysis, and exon-specific sequencing. The APC gene was investigated for large genomic rearrangements by multiplex ligation-dependent probe amplification (MLPA), and for allelic mRNA expression by single nucleotide primer extension (SNuPE). The AXIN2 gene was screened for mutations by sequencing. RESULTS Four families (14%) showed a constitutional deletion of the entire APC gene (three families) or a single exon (one family). Seven families (24%) revealed reduced or extinct mRNA expression from one APC allele in blood, accompanied by loss of heterozygosity in the APC region in six (75%) of eight tumors. In 15 families (52%), possible APC involvement could be neither confirmed nor excluded. Finally, as detailed elsewhere, three families (10%) had germline mutations in genes other than APC, AXIN2 in one family, and MYH in two families. CONCLUSION "APC mutation-negative" FAP is genetically heterogeneous, and a combination of MLPA and SNuPE is able to link a considerable proportion (38%) to APC. Significant differences were observed in clinical manifestations between subgroups, emphasizing the importance of accurate genetic and clinical characterization for the proper management of such families.
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Affiliation(s)
- Elise T Renkonen
- Department of Medical Genetics, Institute of Dentistry, Biomedicum Helsinki, PO Box 63 (Haartmaninkatu 8), FIN-00014 University of Helsinki, Helsinki, Finland
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Abstract
Every year, more than 945000 people develop colorectal cancer worldwide, and around 492000 patients die. This form of cancer develops sporadically, in the setting of hereditary cancer syndromes, or on the basis of inflammatory bowel diseases. Screening and prevention programmes are available for all these causes and should be more widely publicised. The adenoma-carcinoma sequence is the basis for development of colorectal cancer, and the underlying molecular changes have largely been identified. Prognosis depends on factors related to the patient, treatment, and tumour, and the expertise of the treatment team is one of the major determinants of outcome. New information on the molecular basis of this cancer have led to the development of targeted therapeutic options, which are being tested in clinical trials. Further clinical progress will largely depend on the broader implementation of multidisciplinary treatment strategies following the principles of evidence-based medicine.
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Affiliation(s)
- Jürgen Weitz
- Department of Surgery, University of Heidelberg, Heidelberg, Germany
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He YL, Zhang CH, Huang MJ, Cai SR, Zhan WH, Wang JP, Wang JF. Clinical analysis of eight kindreds of familial adenomatous polyposis. World J Gastroenterol 2004; 10:3659-61. [PMID: 15534926 PMCID: PMC4612012 DOI: 10.3748/wjg.v10.i24.3659] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
AIM: To study the early diagnosis and management of familial adenomatous polyposis (FAP).
METHODS: Eight pedigrees of FAP were collected and their pedigree trees were protracted. Clinical characteristics and treatment outcomes of FAP patients in these kindreds were analysed.
RESULTS: A total of 157 members were investigated in eight kindreds and 25 patients with FAP were diagnosed. The ratio of male patients and female patients was 16:9 and the average age at onset was 38 years. Among them, six patients died of cancer with a mortality rate of 28%, and 36% (9/25) FAP patients were diagnosed as synchronous colorectal cancer on the basis of FAP. A proband was diagnosed as synchronous colorectal cancer with liver metastasis and died 11 mo later after partial colectomy and hepatic metastatic lesion biopsy. The other seven probands received total abdominal colectomy and rectal mucosectomy with ileal pouch-anal anastomosis (IPAA), and one of them was diagnosed as synchronous colon cancer on the basis of FAP and was still alive after 7.5 years follow-up. Among the other seven patients with synchronous colorectal cancer on the basis of FAP underwent total abdominal colectomy with ileorectal anastomosis (IRA), one underwent total remnant rectum resection and ileostomy for recurrent carcinoma in the retained rectum 2.5 years later after the IRA and was still alive, while the others all died of recurrence with a median survival time of 4.6 years. Through close follow-up and termly endoscopic surveillance, three FAP patients were detected before presenting symptoms at the age of 18, 20 and 23 years, respectively. Prophylactic IPAA was performed and results were satisfactory after the patients were followed-up for 6, 1, and 8 years, respectively.
CONCLUSION: Pedigree investigation, close follow-up and termly endoscopic surveillance are very important for early detection of FAP. Prophylactic IPAA can give satisfactory results to FAP patients.
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Affiliation(s)
- Yu-Long He
- Department of Gastrointestinopancreatic Surgery, the First Affiliated Hospital, Sun Yat-Sen University, Guangzhou 510080, Guangdong Province, China.
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Muldoon RL, Lowney JK. Familial Adenomatous Polyposis. SEMINARS IN COLON AND RECTAL SURGERY 2004. [DOI: 10.1053/j.scrs.2005.02.009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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