Oral Contraceptive Use and Breast Cancer Risk : Retrospective and Prospective Analyses From a BRCA1 and BRCA2 Mutation Carrier Cohort Study
Background: For BRCA1 and BRCA2 mutation carriers, the association between oral contraceptive preparation (OCP) use and breast cancer (BC) risk is still unclear.Methods: Breast camcer risk associations were estimated from OCP data on 6030 BRCA1 and 3809 BRCA2 mutation carriers using age-dependent Cox regression, stratified by study and birth cohort. Prospective, left-truncated retrospective and fu