For DNMT3B −149C>T polymorphism, when CC genotype was used as reference, the T-allele carrier genotypes (CT+TT) did not show any pronounced correlations with risk of lung cancer (OR = 0.78, 95% CI, 0.57 to 1.05, P = 0.361). The gene discussed is DNMT3B; the disease is lung carcinoma.