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Breast Cancer

Appraising Adjuvant Aromatase Inhibitor Therapy

Mayo Clinic, Jacksonville, Florida, USA

Key Words. Aromatase inhibitor • Breast cancer • Adjuvant therapy

Correspondence: Edith A. Perez, M.D., Mayo Clinic, 4500 San Pablo Road, Jacksonville, Florida 32224, USA. Telephone: 904-953-7283; Fax:904-953-1412;e-mail:perez.edith{at}mayo.edu

Tamoxifen, once the gold standard adjuvant endocrine therapy for early breast cancer, is being challenged by third-generation aromatase inhibitors (AIs) that have demonstrated improved disease-free survival in a variety of adjuvant settings for early breast cancer. Tamoxifen and AIs have different safety profiles, which should allow physicians to begin to individualize treatment based on a patient’s comorbidities and risk factors. Because of its properties as a partial estrogen agonist, tamoxifen has a positive effect on serum lipids and may confer a cardioprotective benefit, as well as a beneficial effect on bone health. However, tamoxifen increases the risk for endometrial cancer and cerebrovascular/thromboembolic events. In comparison, the major side effect of AIs is increased bone loss, which may heighten the risk for osteoporotic fractures and bone pain. Because of their superior efficacy and manageable side effects, AIs are a cost-effective alternative to tamoxifen, and clinical guidelines now embrace AIs as appropriate adjuvant therapy for hormone-sensitive early breast cancer. The anticipated results of ongoing trials will provide further insights into the long-term safety and application of AI therapy in the adjuvant setting.

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