Update on Breast Cancer Risk Reduction Therapy

In women at increased risk of breast cancer age ≥35 years, the selective estrogen receptor modulator (SERM) tamoxifen should be discussed as an option to reduce the risk of estrogen receptor (ER)-positive breast cancer. In postmenopausal women, raloxifene, anastrozole, and exemestane should also be discussed as options for breast cancer risk reduction. Risk reduction with SERMs continues for at least 10 years in both premenopausal and postmenopausal women. Tamoxifen is not recommended for women with a history of deep vein thrombosis, pulmonary embolus, stroke, transient ischemic attack, or during prolonged immobilization. Chemoprevention with a SERM may be particularly beneficial to women with atypical hyperplasia, a 5-year risk of more than 5 %, in women with increased mammographic density, or in women with lobular carcinoma in situ. Aromatase inhibitor therapy is of value in high-risk postmenopausal women. Toxicity with tamoxifen is minimal in premenopausal women and is less with either raloxifene or an aromatase inhibitor in postmenopausal women.