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- W2053552125 abstract "A subset of sporadic colorectal cancers (SCRCs) exhibits microsatellite instability (MSI). Most MSI in SCRCs is caused by hMLH1 inactivation due to promoter methylation. However, the role of MSI in the progression of SCRCs remains unclear.Thirty-two intramucosal cancers and 63 cancers with submucosal invasion were assigned to group 1 (early-stage cancer), and 30 Dukes' B and 26 Dukes' C cancers to group 2 (advanced-stage cancer). hMLH1 promoter methylation status was determined by methylation-specific PCR. MSI was determined using five markers. hMLH1 expression was determined immunohistochemically.MSI was found in 1 of 95 (1.1%) tumors in group 1, compared with 4 of 56 (7.1%) tumors in group 2. In right-sided tumors, the overall frequency of hMLH1-methylation-positive tumors in group 1 was not significantly different from that in group 2 (17 of 43, 39.5%, vs. 9 of 23, 39.1%). In right-sided tumors with hMLH1 promoter methylation, the frequency of MSI-positive tumors in group 1 was significantly lower than that in group 2 (1 of 17, 5.9%, vs. 4 of 9, 44.4%, p=0.0081).The frequency of MSI caused by hMLH1 promoter methylation increases with tumor progression in right-sided SCRCs." @default.
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- W2053552125 date "2005-12-05" @default.
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- W2053552125 title "Microsatellite Instability Caused by <i>hMLH1</i> Promoter Methylation Increases with Tumor Progression in Right-Sided Sporadic Colorectal Cancer" @default.
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- W2053552125 doi "https://doi.org/10.1159/000089768" @default.
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