title: Cytochrome P450 1A1 (CYP1A1) polymorphisms and breast cancer risk in Korean women.
abstract: Cytochrome P450 1A1 (CYP1A1) is involved in the 2-hydroxylation of estrogen, the hormone that plays a critical role in the etiology of breast carcinoma. We evaluated the associations between two CYP1A1 polymorphisms [MspI (rs4646903); Ile462Val (rs1048943)] and breast cancer in a multicenter case-control study of 513 breast cancer cases and 447 controls in Korea. Women carrying the T allele of the CYP1A1 MspI polymorphism were found to have a 1.72-fold (95% CI 1.11-2.68) greater risk of developing breast cancer. No association was found between any CYP1A1 Ile462Val polymorphism and breast cancer. Haplotype analysis of the two loci showed that the CA haplotype was associated with the lowest risk of breast cancer, and CA/CA diplotypes were associated with a lower risk of breast cancer [OR=0.28 (0.13-0.61)] than others/others diplotypes. Moreover, this reduced risk was more pronounced among women with a lower body mass index (BMI) [OR=0.18 (0.06-0.58)] or with a shorter lifetime exposure to estrogen [OR=0.23 (0.07-0.81)]. The results obtained suggest that the CYP1A1 MspI polymorphisms could affect susceptibility to breast cancer.
authors.affiliation: Department of Preventive Medicine, Seoul National University College of Medicine, Seoul 110-799, Korea.
authors.forename: Aesun
authors.initials: A
authors.lastname: Shin
authors.forename: Daehee
authors.initials: D
authors.lastname: Kang
authors.forename: Ji-Yeob
authors.initials: JY
authors.lastname: Choi
authors.forename: Kyoung-Mu
authors.initials: KM
authors.lastname: Lee
authors.forename: Sue Kyung
authors.initials: SK
authors.lastname: Park
authors.forename: Dong-Young
authors.initials: DY
authors.lastname: Noh
authors.forename: Sei-Hyun
authors.initials: SH
authors.lastname: Ahn
authors.forename: Keun-Young
authors.initials: KY
authors.lastname: Yoo
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D015992:Body Mass Index; D001943:Breast Neoplasms / Q000235:genetics*; D016022:Case-Control Studies; D019363:Cytochrome P-450 CYP1A1 / Q000235:genetics*; D004198:Disease Susceptibility; D005260:Female; D006239:Haplotypes; D006801:Humans; D007723:Korea; D008875:Middle Aged; D011110:Polymorphism, Genetic
chemical_list: D019363:Cytochrome P-450 CYP1A1