title: No association between CYP17 T-34C polymorphism and breast cancer risk: a meta-analysis involving 58,814 subjects.
abstract: Breast cancer is one of the most common malignant tumors worldwide. To date, many articles have evaluated the association between Cytochrome P450c17 (CYP17) T-34C 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, ISI Web of Knowledge, Cochrane, ScienceDirect, EBSCO, CNKI, and SinoMed databases, 43 studies including 26,008 cases and 32,806 controls were collected for CYP17 T-34C polymorphism. Crude ORs with 95% CIs were used to assess the strength of association between CYP17 T-34C polymorphism and breast cancer risk. The pooled ORs were performed for codominant model, dominant model, and recessive model, respectively. Overall, no significant associations between CYP17 T-34C polymorphism and breast cancer susceptibility were found for TT versus CC (OR = 0.96; 95% CI: 0.89-1.05), TC versus CC (OR = 0.97; 95% CI: 0.89-1.06), TT + TC versus CC (OR = 0.97; 95% CI: 0.89-1.05) and TT versus TC + CC (OR = 0.98; 95% CI: 0.93-1.03). In the stratified analysis by ethnicity, menopausal status, and sources of controls, significant associations were still not detected in all genetic models. In conclusion, this meta-analysis strongly suggests that CYP17 T-34C 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: Zhen
authors.initials: Z
authors.lastname: Yang
authors.forename: Yang
authors.initials: Y
authors.lastname: Zhong
authors.forename: Long
authors.initials: L
authors.lastname: Yu
mesh_terms: D020121:5' Untranslated Regions / Q000235:genetics*; D001943:Breast Neoplasms / Q000453:epidemiology* / Q000208:ethnology / Q000235:genetics; D016022:Case-Control Studies; D005006:Ethnicity / Q000235:genetics / Q000706:statistics & numerical data; D005260:Female; D020022:Genetic Predisposition to Disease; D005838:Genotype; D006801:Humans; D008593:Menopause; D016017:Odds Ratio; D012150:Polymorphism, Restriction Fragment Length; D012306:Risk; D013254:Steroid 17-alpha-Hydroxylase / Q000235:genetics*
chemical_list: D020121:5' Untranslated Regions; C501892:CYP17A1 protein, human; D013254:Steroid 17-alpha-Hydroxylase