title: A polymorphism in the CYP17 gene increases the risk of breast cancer.
abstract: We conducted a case-control study to determine whether a polymorphism in the CYP17 gene was associated with risk of breast cancer. We found an increased risk of advanced breast cancer in women carrying an A2 allele. The odds ratio was 2.5 [95% confidence interval (CI), 1.07-5.94] for regional or metastatic disease. Among controls, the A1/A1 genotype was associated with a later age at menarche. The reduced risk of breast cancer associated with a later age of menarche was largely limited to A1/A1 women: odds ratio, 0.47 (CI, 0.22-0.98) for breast cancer and later age at menarche among A1 homozygotes compared with 0.80 (CI, 0.51-1.27) for A1/A2 and A2/A2 genotypes. These findings suggest that the CYP17 genotype may be a biomarker for the onset of ovulation and advanced breast cancer risk.
authors.affiliation: Department of Preventive Medicine, University of Southern California School of Medicine, Los Angeles 90033-0800, USA.
authors.forename: H S
authors.initials: HS
authors.lastname: Feigelson
authors.forename: G A
authors.initials: GA
authors.lastname: Coetzee
authors.forename: L N
authors.initials: LN
authors.lastname: Kolonel
authors.forename: R K
authors.initials: RK
authors.lastname: Ross
authors.forename: B E
authors.initials: BE
authors.lastname: Henderson
mesh_terms: D000368:Aged; D001943:Breast Neoplasms / Q000453:epidemiology / Q000235:genetics* / Q000517:prevention & control; D016022:Case-Control Studies; D004198:Disease Susceptibility; D004967:Estrogens / Q000378:metabolism; D005260:Female; D005838:Genotype; D006801:Humans; D008572:Menarche / Q000235:genetics*; D008875:Middle Aged; D016017:Odds Ratio; D011110:Polymorphism, Genetic; D012306:Risk; D013254:Steroid 17-alpha-Hydroxylase / Q000235:genetics* / Q000502:physiology
chemical_list: D004967:Estrogens; D013254:Steroid 17-alpha-Hydroxylase