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- W2045354247 abstract "The WNT/β-catenin (CTNNB1) pathway is commonly activated in the carcinogenic process. Cross-talks between the WNT and cyclooxygenase-2 (COX-2 or PTGS2)/prostaglandin pathways have been suggested. The relationship between (3-catenin activation and microsatellite instability (MSI) in colorectal cancer has been controversial. The CpG island methylator phenotype (CIMP or CIMP-high) with widespread promoter methylation is a distinct epigenetic phenotype in colorectal cancer, which is associated with MSI-high. However, no study has examined the relationship between (β-catenin activation and CIMP status. Using 832 population-based colorectal cancer specimens, we assessed (3-catenin localization by immunohistochemistry. We quantified DNA methylation in eight CIMP-specific promoters [CACNA1G, CDKN2A(p16), CRABP1, IGF2, MLH1, NEUROG1, RUNX3, and SOCS1] by real-time polymerase chain reaction (MethyLight). MSI-high, CIMP-high, and BRAF mutation were associated inversely with cytoplasmic and nuclear (β-catenin expressions (i.e., β-catenin activation) and associated positively with membrane expression. The inverse relation between (β-catenin activation and CIMP was independent of MSI. COX-2 overexpression correlated with cytoplasmic (β-catenin expression (even after tumors were stratified by CIMP status), but did not correlate significantly with nuclear or membrane expression. In conclusion, β-catenin activation is inversely associated with CIMP-high independent of MSI status. Cytoplasmic β-catenin is associated with COX-2 overexpression, supporting the role of cytoplasmic β-catenin in stabilizing PTGS2(COX-2) mRNA." @default.
- W2045354247 created "2016-06-24" @default.
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- W2045354247 date "2007-07-01" @default.
- W2045354247 modified "2023-10-10" @default.
- W2045354247 title "Correlation of β-Catenin Localization with Cyclooxygenase-2 Expression and CpG Island Methylator Phenotype (CIMP) in Colorectal Cancer" @default.
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- W2045354247 doi "https://doi.org/10.1593/neo.07334" @default.
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