title: The CYP1B1 Leu432Val polymorphism contributes to lung cancer risk: evidence from 6501 subjects.
abstract: The polymorphism of cytochrome P4501B1 (CYP1B1) codon 432 (rs1056836, CYP1B1*3, or Leu432Val) is thought to have a significant effect on lung cancer risk, but the results are inconsistent. In this meta-analysis, we assessed 9 published studies involving 6501 subjects that investigated the association between the CYP1B1 codon 432 polymorphism and risk of lung cancer. Overall, the CYP1B1 Leu/Val and Val/Val-variant genotypes were associated with a significantly increased risk of lung cancer in different genetic models (heterozygote comparison: OR=1.22; 95% CI=1.02-1.45, P(heterogeneity)=0.068; homozygote comparison: OR=1.41; 95% CI=1.08-1.85, P(heterogeneity)=0.071; dominant model comparison: OR=1.26; 95% CI=1.04-1.51, P(heterogeneity)=0.019; and recessive model comparison: OR=1.17; 95% CI=1.02-1.34, P(heterogeneity)=0.429). In the stratified analysis by ethnicity, significantly increased risks were found among Caucasians for Leu/Val vs Leu/Leu (OR=1.30; 95% CI=1.03-1.64; P(heterogeneity)=0.092), and dominant model (OR=1.35; 95% CI=1.03-1.77; P(heterogeneity)=0.015). However, no significant associations were found in both Europeans and African-Americans for all genetic models. In the subgroup analyses by smoking status, a significantly increased risk of lung cancer was found among smokers (dominant model: OR=1.46; 95% CI=1.08-1.83; P(heterogeneity)=0.175). However, we did not find any statistically significant association by subgroup analyses of pathological type. This meta-analysis suggests that the CYP1B1 Val allele is a low-penetrant risk factor for developing lung cancer.
authors.affiliation: Department of Geriatrics, The First Affiliated Hospital, Nanjing Medical University, Nanjing, China.
authors.forename: Bo
authors.initials: B
authors.lastname: Chen
authors.forename: Li-Xin
authors.initials: LX
authors.lastname: Qiu
authors.forename: Yan
authors.initials: Y
authors.lastname: Li
authors.forename: Wei
authors.initials: W
authors.lastname: Xu
authors.forename: Xue-Li
authors.initials: XL
authors.lastname: Wang
authors.forename: Wei-Hong
authors.initials: WH
authors.lastname: Zhao
authors.forename: Jian-Qing
authors.initials: JQ
authors.lastname: Wu
mesh_terms: D000230:Adenocarcinoma / Q000453:epidemiology* / Q000235:genetics* / Q000473:pathology / Q000503:physiopathology; D001189:Aryl Hydrocarbon Hydroxylases / Q000235:genetics*; D065633:Cytochrome P-450 CYP1B1; D005006:Ethnicity; D056726:Genetic Association Studies; D020022:Genetic Predisposition to Disease; D005838:Genotype; D006801:Humans; D007930:Leucine / Q000235:genetics; D008175:Lung Neoplasms / Q000453:epidemiology* / Q000235:genetics* / Q000473:pathology / Q000503:physiopathology; D019683:Penetrance; D011110:Polymorphism, Genetic; D012306:Risk; D012907:Smoking; D014633:Valine / Q000235:genetics
chemical_list: D001189:Aryl Hydrocarbon Hydroxylases; C585496:CYP1B1 protein, human; D065633:Cytochrome P-450 CYP1B1; D007930:Leucine; D014633:Valine