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• W2045229182 abstract "Abstract Purpose: Data on the prognostic significance of promoter CpG island methylation in colorectal cancer (CRC) are conflicting, possibly due to associations between methylation and other factors affecting survival such as genetic alterations and use of adjuvant therapy. Here, we examine the prognostic impact of promoter methylation in patients with CRC treated with surgery alone in the context of microsatellite instability (MSI), BRAF and KRAS mutations. Experimental Methods: One hundred and seventy-three CRCs were analyzed for promoter methylation of 19 tumor suppressor and DNA repair genes, the CpG island methylator phenotype (CIMP), MSI, the exon 15 V600E BRAF mutation and KRAS codon 12 and 13 mutations. Results: Unsupervised hierarchical clustering based on methylation status of 19 genes revealed three subgroups: cluster 1 [CL1, 57% (98/173) of CRCs], cluster 2 [CL2, 25% (43/173) of CRCs], and cluster 3 [CL3, 18% (32/173) of CRCs]. CL3 had the highest methylation index (0.25, 0.49, and 0.69, respectively, P = &lt;0.01) and was strongly associated with CIMP (P &lt; 0.01). Subgroup analysis for tumor stage, MSI, and BRAF status showed no statistically significant differences in survival between CL1, CL2, and CL3 nor between CIMP and non-CIMP CRCs. Analyzing genes separately revealed that CHFR promoter methylation was associated with a poor prognosis in stage II, microsatellite stability (MSS), BRAF wild-type (WT) CRCs: multivariate Cox proportional HR = 3.89 [95% confidence interval (CI), 1.58–9.60, P &lt; 0.01; n = 66] and HR = 2.11 (95% CI, 0.95–4.69, P = 0.068, n = 136) in a second independent population-based study. Conclusions: CHFR promoter CpG island methylation, which is associated with MSI, also occurs frequently in MSS CRCs and is a promising prognostic marker in stage II, MSS, BRAF WT CRCs. Clin Cancer Res; 20(12); 3261–71. ©2014 AACR." @default.
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• W2045229182 date "2014-06-12" @default.
• W2045229182 modified "2023-10-17" @default.
• W2045229182 title "<i>CHFR</i> Promoter Methylation Indicates Poor Prognosis in Stage II Microsatellite Stable Colorectal Cancer" @default.
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• W2045229182 doi "https://doi.org/10.1158/1078-0432.ccr-12-3734" @default.
• W2045229182 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/24928946" @default.
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