title: No association between CYP1B1 Val432Leu polymorphism and breast cancer risk: a meta-analysis involving 40,303 subjects.
abstract: Breast cancer is the most common cancer in women. To date, many publications have evaluated the association between Cytochrome P450 1B1 (CYP1B1) Val432Leu polymorphism and breast cancer risk. However, the results remain inconclusive. In order to derive a more precise estimation of the association, a meta-analysis was performed in this study. By searching Medline, Pubmed, and ISI Web of Knowledge databases, 26 studies including 19,028 cases and 21,275 controls were collected for CYP1B1 Val432Leu polymorphism. Crude ORs with 95% CIs were used to assess the strength of association between CYP1B1 Val432Leu polymorphism and breast cancer risk. The pooled ORs were performed for codominant model, dominant model, and recessive model, respectively. Overall, no significant associations between CYP1B1 Val432Leu polymorphism and breast cancer susceptibility were found for Val/Val versus Leu/Leu (OR = 0.98; 95% CI: 0.90-1.06), Val/Leu versus Leu/Leu (OR = 1.01; 95% CI: 0.93-1.09), Val/Val + Val/Leu versus Leu/Leu (OR = 1.00; 95% CI: 0.93-1.08) and Val/Val versus Val/Leu + Leu/Leu (OR = 0.96; 95% CI: 0.91-1.01). In the stratified analysis by ethnicity, menopausal status and sources of controls, significant associations were still not observed in all genetic models. In conclusion, this meta-analysis provides strong evidence that CYP1B1 Val432Leu polymorphism is not associated with breast cancer risk.
authors.affiliation: State Key Laboratory of Genetic Engineering, Institute of Genetics, School of Life Sciences, Fudan University, 200433 Shanghai, People's Republic of China.
authors.forename: Lei
authors.initials: L
authors.lastname: Yao
authors.forename: Fang
authors.initials: F
authors.lastname: Fang
authors.forename: Qi
authors.initials: Q
authors.lastname: Wu
authors.forename: Yang
authors.initials: Y
authors.lastname: Zhong
authors.forename: Long
authors.initials: L
authors.lastname: Yu
mesh_terms: D019943:Amino Acid Substitution; D001189:Aryl Hydrocarbon Hydroxylases; D001943:Breast Neoplasms / Q000453:epidemiology* / Q000208:ethnology / Q000235:genetics; D016022:Case-Control Studies; D065633:Cytochrome P-450 CYP1B1; D003577:Cytochrome P-450 Enzyme System / Q000235:genetics*; D005006:Ethnicity / Q000235:genetics / Q000706:statistics & numerical data; D005260:Female; D020022:Genetic Predisposition to Disease; D005838:Genotype; D006801:Humans; D008593:Menopause; D016017:Odds Ratio; D020641:Polymorphism, Single Nucleotide; D012306:Risk
chemical_list: D003577:Cytochrome P-450 Enzyme System; D001189:Aryl Hydrocarbon Hydroxylases; C585496:CYP1B1 protein, human; D065633:Cytochrome P-450 CYP1B1