作者: J. Smeby , A. Sveen , M.A. Merok , S.A. Danielsen , I.A. Eilertsen
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摘要: Background The prognostic impact of KRAS and BRAFV600E mutations in primary colorectal cancer (CRC) varies with microsatellite instability (MSI) status. gene expression-based consensus molecular subtypes (CMSs) CRC define molecularly clinically distinct subgroups, represent a novel stratification framework biomarker analysis. We investigated the value these within CMS groups. Patients methods Totally 1197 tumors from Norwegian series stage I-IV were analyzed for MSI mutation status hotspots (codons 12, 13 61) BRAF (codon 600). A subset was expression confident classification obtained 317 samples. This cohort expanded clinical data, including classification, 514 patients publically available dataset GSE39582. Gene signatures associated used to evaluate differential on among Results both inferior 5-year overall survival (OS) exclusively MSS (BRAFV600E versus KRAS/BRAF wild-type: Hazard ratio (HR) 2.85, P < 0.001; HR 1.30, P = 0.013). BRAFV600E-mutated strongly enriched metastatic disease CMS1, leading negative this subtype (OS: 7.73, P = 0.001). In contrast, poor prognosis limited CMS2/CMS3 epithelial-like profiles 1.51, P = 0.011). subtype-specific associations substantiated by effects according group. Conclusions are CMS1 tumors, subtype. adverse outcome epithelial (CMS2/CMS3) tumors.