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• W1523706257 abstract "<b><i>Aims:</i></b> To investigate tumor and patient characteristics of individuals with mismatch repair (MMR)-deficient colorectal carcinomas. <b><i>Methods:</i></b> We immunhistochemically investigated tissue samples of 307 consecutive patients with colorectal cancer for defects in DNA MMR proteins (hMLH1, hMSH2, hMSH6, hPMS2) and those with mutations further for microsatellite instability (MSI) and BRAF V600E mutations. <b><i>Results:</i></b> 32/308 (10.4%) tumors showed MMR deficiency. Seventy five percent (n = 24) had loss of hMLH1 and hPMS2 expression, 3% (n = 1) of hPMS2 alone, 18.8% (n = 6) of hMSH6 and hMSH2, 3% (n = 1) of hMSH2 alone. All MMR-deficient tumors showed high MSI. These tumors occurred preferably in the right-sided colon, in women and showed specific histological features. We obtained the family history of 18/32 patients; 2 (11.1%) met Amsterdam Criteria, 5 (27.8%) Bethesda Guidelines and 6 (33.3%) revised Bethesda Guidelines. BRAF V600E mutations were found in 16 (67%) of hMLH1 and none of the hMSH2 deficient tumors. <b><i>Conclusion:</i></b> We suggest using immunhistochemical testing of tumor tissues with subsequent MSI analysis, which may be justified as a screening method for MMR deficiency in colorectal cancer, since it identifies patients with possibly hereditary defects and unalike response to chemotherapy." @default.
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• W1523706257 date "2015-01-01" @default.
• W1523706257 modified "2023-10-16" @default.
• W1523706257 title "Tumor and Patient Characteristics of Individuals with Mismatch Repair Deficient Colorectal Cancer" @default.
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• W1523706257 doi "https://doi.org/10.1159/000381284" @default.
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