title: Hormone replacement therapy is more prevalent among Jewish BRCA1/2 mutation carriers.
abstract: The aim of this study was to compare reproductive factors, use of oral contraceptives (OC) and hormone replacement therapy (HRT) in consecutive Jewish Ashkenazi breast cancer patients, with and without BRCA1/BRCA2 mutations. Jewish Israeli women with breast cancer (n=385) were genotyped for the three predominant Jewish mutations in BRCA1 and BRCA2, and data on reproductive factors, OC and HRT use, were analyzed using logistic regression analyses. Overall, 28/385 (7.3%) of participants were mutation carriers, the majority of whom were Ashkenazi (n=22; 78.6%) and were diagnosed with breast cancer at or under age 49 years (n=18; 64.3%). Mutation carriers were more likely than non-carriers to ever use OC (39.3% vs. 20.2%; P=0.053), HRT (35.7% vs. 13.7%; P=0.007), and have first menarche at or below 12 years of age (71.4% vs. 40.6%; P=0.03). Multivariate analysis showed that Ashkenazi women diagnosed with breast cancer under 40 years of age, with a family history of breast/ovarian cancer, who ever used HRT were more likely to be mutation carriers. This study has shown that HRT use is more prevalent among Jewish Ashkenazi mutation carriers, but its role in modifying breast cancer risk in mutation carriers remains unknown.
authors.affiliation: The Susanne Levy Gertner Oncogenetics Unit, The Danek Gertner Institute of Human Genetics, Chaim Sheba Medical Center, Tel-Hashomer 52621, Israel.
authors.forename: Revital Bruchim Bar
authors.initials: RB
authors.lastname: Sade
authors.forename: Angela
authors.initials: A
authors.lastname: Chetrit
authors.forename: Arie
authors.initials: A
authors.lastname: Figer
authors.forename: Moshe Z
authors.initials: MZ
authors.lastname: Papa
authors.forename: Dov
authors.initials: D
authors.lastname: Flex
authors.forename: Shulamit
authors.initials: S
authors.lastname: Rizel
authors.forename: Eitan
authors.initials: E
authors.lastname: Friedman
mesh_terms: D000328:Adult; D000368:Aged; D001943:Breast Neoplasms / Q000208:ethnology / Q000235:genetics*; D003276:Contraceptives, Oral; D005260:Female; D019398:Genes, BRCA1; D024522:Genes, BRCA2; D006579:Heterozygote; D020249:Hormone Replacement Therapy / Q000706:statistics & numerical data*; D006801:Humans; D007585:Jews / Q000235:genetics*; D008875:Middle Aged; D009154:Mutation / Q000235:genetics*; D012044:Regression Analysis
chemical_list: D003276:Contraceptives, Oral