Cancer risk in hereditary nonpolyposis colorectal cancer due to MSH6 mutations: impact on counseling and surveillance

Gastroenterology
Yvonne M C HendriksH F Vasen

Abstract

Hereditary nonpolyposis colorectal carcinoma (HNPCC) is caused by a mutated mismatch repair (MMR) gene. The aim of our study was to determine the cumulative risk of developing cancer in a large series of MSH6 mutation carriers. Mutation analysis was performed in 20 families with a germline mutation in MSH6. We compared the cancer risks between MSH6 and MLH1/MSH2 mutation carriers. Microsatellite instability (MSI) analysis and immunohistochemistry (IHC) were performed in the available tumors. A total of 146 MSH6 mutation carriers were identified. In these carriers, the cumulative risk for colorectal carcinoma was 69% for men, 30% for women, and 71% for endometrial carcinoma at 70 years of age. The risk for all HNPCC-related tumors was significantly lower in MSH6 than in MLH1 or MSH2 mutation carriers (P = 0.002). In female MSH6 mutation carriers, the risk for colorectal cancer was significantly lower (P = 0.0049) and the risk for endometrial cancer significantly higher (P = 0.02) than in MLH1 and MSH2 mutation carriers. In male carriers, the risk for colorectal cancer was lower in MSH6 mutation carriers, but the difference was not significant (P = 0.0854). MSI analysis in colorectal tumors had a sensitivity of 86% in predicting ...Continue Reading

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