rs6087990

This study examined genetic and epigenetic markers associated with chemotherapy-induced oral mucositis in 87 pediatric patients with hematological neoplasms, with 81.9% developing mucositis. Global DNA methylation was significantly reduced in children who recovered from mucositis (18% vs 40% in healthy controls, p<0.05), and the DNMT1 rs2228611 SNP showed association with global methylation levels in cancer patients with mucositis history. miR-9-1 and miR-9-3 methylation patterns were associated with tumor status rather than mucositis.

This case-control association study evaluated 23 genetic sequence variants in 17 genes across DNA repair, cell cycle, and other pathways in 531 stage I-II radiation-treated head and neck cancer (HNC) patients to identify associations with secondary primary cancers (SPCs). Among the variants tested, the DNMT3B C149T variant (rs2424913) showed a strong significant association with SPC development, with adjusted hazard ratios of 2.23 (95% CI, 1.32-3.78; P = .003) for TT versus CC genotype and 1.49 (95% CI, 1.15-1.95; P = .003) per T allele. A haplotype cluster of 5 DNMT3B variants in strong linkage disequilibrium also showed significant associations (P < .003), suggesting aberrant DNA methylation is an important modulator of field cancerization in HNC.

This case-control and family-based study evaluated 64 SNPs in 34 genes for associations with spina bifida in 558 Irish case-families and 994 controls. Spina bifida was significantly associated with LEPR rs1805134 (GRR: 1.5, P = 0.0264) and COMT rs737865 (GRR: 1.4, P = 0.0206), with additional confirmations of previous findings in MTHFR 677C>T and other genes, suggesting roles for leptin signaling and methylation pathways in neural tube defect pathogenesis.

This candidate gene association study examined 16 DNA repair gene polymorphisms in 94 patients with metastatic colorectal cancer treated with oxaliplatin-based chemotherapy. The MGMT -535G>T polymorphism (rs1625649) was found to be significantly associated with progression-free survival (PFS) (p=0.076 in univariate analysis), with TT genotype showing improved prognosis compared to GG/GT genotypes (HR=3.137, p=0.005 in multivariate analysis). Several other polymorphisms in DNA repair genes were evaluated for associations with chemotherapy response and survival outcomes.