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RATIONALE: Letrozole may prevent breast cancer in postmenopausal women with a BRCA1 or BRCA2 mutation. PURPOSE: This randomized phase III trial is studying letrozole to see how well it works compared with a placebo in preventing breast cancer in postmenopausal women with a BRCA1 or BRCA2 mutation.
- BRCA1 Mutation Carrier ,BRCA2 Mutation Carrier ,Breast Cancer ,Hereditary Breast/Ovarian Cancer (brca1, brca2)