Genetic Polymorphisms Involved in Carcinogen Metabolism and DNA Repair and Lung Cancer Risk in a Japanese Population

BackgroundSeveral components of overall lung carcinogenesis, carcinogen metabolic and DNA repair pathways may be involved in individual genetic susceptibility to lung cancer.MethodsWe evaluated the role of cytochrome P450 (CYP) 1A1 rs4646903 and rs104894, glutathione S-transferase (GST) M1 and GSTT1 deletion polymorphisms, GSTP1 rs1695, x-ray repair, excision repair cross-complementing group 2 (ERCC2) rs13181, complementing defective in Chinese hamster 1 rs25487, and XRCC3 rs861539 in a case-control study comprising 462 lung cancer cases and 379 controls in a Japanese population. Unconditional logistic regression was used to assess the adjusted odds ratios (OR) and 95% confidence intervals (95% CI).ResultsCYP1A1 rs4646903 (OR = 1.72, 95% CI = 1.25–2.38), rs1048943 (OR = 1.40, 95% CI = 1.02–1.92), the GSTM1 deletion polymorphism (OR = 1.38, 95% CI = 1.01–1.89), GSTP1 rs1695 (OR =1.48, 95% CI = 1.04–2.11), ERCC2 rs13181 (OR = 1.89, 95% CI = 1.28–2.78), and Chinese hamster 1 rs25487 (OR = 1.54, 95% CI = 1.12–2.13) were associated with lung cancer risk whereas the GSTT1 deletion polymorphism and XRCC3 rs861539 were not. A pertinent combination of multiple “at-risk” genotypes of CYP1A1 rs4646903, the GSTM1 deletion polymorphism and ERCC2 rs13181 was at a 5.94-fold (95% CI = 2.77–12.7) increased risk of lung cancer.ConclusionsA pertinent combination of multiple at-risk genotypes may detect a high-risk group. Further studies are warranted to verify our findings.