title: Influence of selected lifestyle factors on breast and ovarian cancer risk in BRCA1 mutation carriers from Poland.
abstract: It has been estimated that the lifetime risk of breast cancer among women who inherit a BRCA1 or BRCA2 mutation is as high as 80%, and the risk estimates for ovarian cancer range from 15 to 40%. Several environmental and lifestyle factors are believed to contribute to the development of breast cancer in the general population and it is of interest to establish if these factors operate among mutation carriers as well. To evaluate the effects of age of menarche, parity, breast-feeding, oophorectomy and oral contraceptive use, as well as smoking and coffee consumption, on the risks of breast and ovarian cancer, we conducted a matched case-control study of Polish women with BRCA1 mutations. There were 348 breast cancer patients, 150 ovarian cancer patients and similar numbers of age-matched controls. BRCA1 carriers with late age of menarche, lower parity and long-term breast-feeding were less likely to develop breast cancer. Oral contraceptives protected against ovarian cancer.
authors.affiliation: International Hereditary Cancer Center, Department of Genetics and Pathology, Pomeranian Medical University, Szczecin, Poland. jgron@uoo.univ.szczecin.pl
authors.forename: Jacek
authors.initials: J
authors.lastname: Gronwald
authors.forename: Tomasz
authors.initials: T
authors.lastname: Byrski
authors.forename: Tomasz
authors.initials: T
authors.lastname: Huzarski
authors.forename: Cezary
authors.initials: C
authors.lastname: Cybulski
authors.forename: Ping
authors.initials: P
authors.lastname: Sun
authors.forename: Anna
authors.initials: A
authors.lastname: Tulman
authors.forename: Steven A
authors.initials: SA
authors.lastname: Narod
authors.forename: Jan
authors.initials: J
authors.lastname: Lubinski
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D001943:Breast Neoplasms / Q000235:genetics* / Q000517:prevention & control; D016022:Case-Control Studies; D002648:Child; D003276:Contraceptives, Oral / Q000627:therapeutic use; D005260:Female; D019398:Genes, BRCA1; D018095:Germ-Line Mutation; D006579:Heterozygote; D006801:Humans; D008019:Life Style; D008875:Middle Aged; D009154:Mutation; D010051:Ovarian Neoplasms / Q000235:genetics* / Q000517:prevention & control; D010298:Parity; D011247:Pregnancy; D012307:Risk Factors
chemical_list: D003276:Contraceptives, Oral