Recent oral contraceptive use has been associated with a small increase in breast cancer risk and a substantial decrease in ovarian cancer risk. The effects on risks for women with germ line mutations in BRCA1 or BRCA2 are unclear.
Centre for Genetic Epidemiology, The University of Melbourne, Level 2, 723 Swanston Street, Carlton, Victoria 3053, Australia. j.hopper@unimelb.edu.au.