Lynch Syndrome Studies Highlight Screening, Surveillance Opportunities

Two studies on Lynch syndrome highlight cancer screening and surveillance opportunities.
Source: CancerNetwork - Category: Cancer & Oncology Authors: Tags: Colorectal Cancer Endometrial Cancer Gastrointestinal Cancer Gynecologic Cancers News Ovarian Cancer Source Type: news

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This review is an appraisal of the current state of knowledge of 2 enigmatic histotypes of ovarian carcinoma: endometrioid and clear cell carcinoma. Both show an association endometriosis and the hereditary nonpolyposis colorectal cancer (Lynch) syndrome, and both typically present at an early stage. Pathologic and immunohistochemical features that distinguish these tumors from high-grade serous carcinomas, each other, and other potential mimics are discussed, as are staging, grading, and molecular pathogenesis.
Source: Surgical Pathology Clinics - Category: Pathology Authors: Source Type: research
Immunohistochemistry (IHC) for mismatch repair (MMR) proteins is an established test to identify Lynch syndrome (LS) in patients with colorectal cancer and is being increasingly used to identify LS in women with endometrial and/or nonserous ovarian cancer (OC). We assessed interobserver agreement in the interpretation of MMR-IHC on endometrial and ovarian carcinomas. The study consisted of 73 consecutive endometrial cancers (n=48) and nonserous, nonmucinous epithelial OCs (n=25). Six pathologists from 2 cancer centers, one with and the other without, previous experience in interpreting MMR-IHC, evaluated MLH1, MSH2, MSH6, ...
Source: The American Journal of Surgical Pathology - Category: Pathology Tags: Original Articles Source Type: research
Consumer genetics company 23andMe is diving deeper into the medical space. On Jan. 22, the company announced that the Food and Drug Administration (FDA) approved its newest report, which can flag whether people have genetic variants that may raise their risk of developing colorectal cancer. The new test looks for two gene variants associated with MUTYH-associated polyposis, an inherited colorectal cancer syndrome. “If left unchecked, carrying both of these variants or having two copies of one increases the risk of developing colorectal cancer to between 43 and 100 percent,” according to 23andMe. The test will b...
Source: TIME: Health - Category: Consumer Health News Authors: Tags: Uncategorized Cancer healthytime Source Type: news
ConclusionsOur data suggest the spectrum of genotyped mutations in AJ BC patients with a personal or family history of LS-related cancers should be expanded. These data should be validated in other populations with a similar phenotype.
Source: Cancer Causes and Control - Category: Cancer & Oncology Source Type: research
Conclusion: Lynch syndrome confers an increased risk for multiple cancers other than colorectal and endometrial cancer. The proportions of other cancers vary between different MMR genes, with highest frequency in MSH2-carriers. Gender and age also affect the tumour spectrum, demonstrating the importance of additional environmental and constitutional parameters in determining the predisposition for different cancer types. PMID: 30386444 [PubMed]
Source: Clinical Colorectal Cancer - Category: Cancer & Oncology Authors: Tags: Hered Cancer Clin Pract Source Type: research
ConclusionLynch syndrome confers an increased risk for multiple cancers other than colorectal and endometrial cancer. The proportions of other cancers vary between different MMR genes, with highest frequency inMSH2-carriers. Gender and age also affect the tumour spectrum, demonstrating the importance of additional environmental and constitutional parameters in determining the predisposition for different cancer types.
Source: Hereditary Cancer in Clinical Practice - Category: Cancer & Oncology Source Type: research
Lynch syndrome is a hereditary cancer syndrome that substantially increases risk of developing colorectal and endometrial cancer, as well as elevating the risk of developing cancer of the stomach, ovaries, urinary tract, brain, and small bowel [1,2]. Lynch syndrome is caused by a germline pathogenic variant (i.e., disease-associated mutation) in one of four mismatch repair genes: MLH1, MSH2, MSH6, and PMS2. Pathogenic variants in MSH2 and MLH1 are associated with up to 74% and 54% lifetime risks for colorectal and endometrial cancer, respectively, while PMS2 and MSH6 are associated with up to 22% and 26% lifetime risks for...
Source: Patient Education and Counseling - Category: International Medicine & Public Health Authors: Source Type: research
Abstract DNA repair pathways are essential for cellular survival as our DNA is constantly under assault from both exogenous and endogenous DNA damaging agents. Five major mammalian DNA repair pathways exist within a cell to maintain genomic integrity. Of these, the DNA mismatch repair (MMR) pathway is highly conserved among species and is well documented in bacteria. In humans, the importance of MMR is underscored by the discovery that a single mutation in any one of four genes within the MMR pathway (MLH1, MSH2, MSH6 and PMS2) results in Lynch syndrome (LS). LS is an autosomal dominant condition that predisposes ...
Source: Clinical Genetics - Category: Genetics & Stem Cells Authors: Tags: Clin Genet Source Type: research
Lynch syndrome (LS) is an inherited clinical syndrome characterized by a high risk of colorectal, endometrial (lifetime risk of up to 60%), ovarian and urinary tract cancers. The diagnosis is confirmed by identification of germline mutations in the DNA mismatch repair (MMR) genes MLH1, PMS2, MSH2, MSH6, or EPCAM. In 2015, our institution implemented universal screening of endometrial cancer hysterectomy specimens by MMR immunohistochemistry (IHC) with reflex MLH1 promoter hypermethylation analysis for tumors with loss of MLH1/PMS2 expression.
Source: Human Pathology - Category: Pathology Authors: Tags: Original contribution Source Type: research
This article presents a rare clinical of a 61-year-old female diagnosed with extracolonic Lynch syndrome with six metachronous tumours acquiring in digestive tract during the period from 1993 to 2014 (over 21 years). No other cases of six primary malignancies in patient with Lynch syndrome have been reported in literature. Upon diagnosis of Lynch syndrome, it is important to screen patient for malignancies of different localization as this syndrome predisposes appearance of various cancers at earlier age than in general population. PMID: 28938854 [PubMed - as supplied by publisher]
Source: Acta Chirurgica Belgica - Category: Surgery Tags: Acta Chir Belg Source Type: research
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