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- W2085554251 abstract "Endometrial cancer is the most common gynecologic malignancy in the United States and the most frequent extracolonic tumor in hereditary nonpolyposis colorectal cancer (HNPCC). HNPCC patients have inherited defects in DNA mismatch repair and the microsatellite instability (MSI) tumor phenotype. Sporadic endometrial cancers also exhibit MSI, usually associated with methylation of the MLH1 promoter. Germ-line MSH6 mutations, which are rare in HNPCC, have been reported in several families with multiple members affected with endometrial carcinoma. We reasoned that MSH6 mutation might account for loss of mismatch repair in MSI-positive endometrial cancers in which the cause of MSI is unknown. We therefore investigated MSI and MLH1 promoter methylation in 441 endometrial cancer patients unselected for age or personal and family history of cancers. MSI and MLH1 promoter methylation status were associated with age of onset and tumor histology. One hundred cases (23% of the entire series) were evaluated for MSH6 defects. Inactivating germ-line MSH6 mutations were identified in seven women with MSI-positive, MLH1 promoter unmethylated cancers. Most of the MSI in these cases was seen with mononucleotide repeat markers. The MSH6 mutation carriers were significantly younger than the rest of the population (mean age 54.8 versus 64.6, P = 0.04). Somatic mutations were seen in 17 tumors, all of which had MSI. Our data suggest that inherited defects in MSH6 in women with endometrial cancer are relatively common. The minimum estimate of the prevalence of inherited MSH6 mutation in endometrial cancer is 1.6% (7 of 441), comparable with the predicted prevalence for patients with colorectal cancer." @default.
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- W2085554251 date "2003-05-05" @default.
- W2085554251 modified "2023-10-16" @default.
- W2085554251 title "Prevalence of defective DNA mismatch repair and MSH6 mutation in an unselected series of endometrial cancers" @default.
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- W2085554251 doi "https://doi.org/10.1073/pnas.1030231100" @default.
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