ArticleScientific reports2026
RAS/BRAF wild-type metastatic high-methylated colorectal cancer has gene expression patterns related to MSI-H and BRAF V600E mutant: a translational research.
Article in Scientific reports, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Metastatic colorectal cancer (mCRC) differs clinically based on RAS and BRAF mutations or DNA methylation. However, in mCRC, the prognostic value and biological characteristics of genome-wide DNA methylation status (GWMS) in each RAS/BRAF genotype is unknown. To clarify this, primary tumor samples from patients with informed consent in the phase III TRICOLORE study were collected, and RAS and BRAF mutations, immunohistochemical staining of mismatch repair-related proteins, comprehensive gene expression, and genome-wide DNA methylation were analyzed. The tumor samples were classified into high-methylated colorectal cancer (HMCC) and low-methylated colorectal cancer (LMCC). Gene set enrichment analysis (GSEA) was conducted using microarray data. A total of 226 patients were included and classified into the RAS/BRAF wild-type (wt) (n = 125), RAS mutant (mt) (n = 87), and BRAF mt (n = 14), of whom 22 (17.6%), 30 (34.5%), and 14 (100%) had HMCC. HMCC exhibited significantly worse overall survival (OS) than that of LMCC in the RAS/BRAF wt group but not in the RAS mt group. In GSEA, RAS/BRAF wt HMCC was associated with microsatellite instability and BRAF V600E mutation. The poor prognosis of RAS/BRAF wt HMCC may be attributed to gene expression patterns associated with microsatellite instability and BRAF V600E mutation.
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