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Department of Endocrinology, Reproductive Medicine and Osteoporosis, Philipps-University of Marburg, Baldingerstrasse, 35033 Marburg, Germany

(Correspondence should be addressed to P Hadji; Email: hadji{at}med.uni-marburg.de)

Third-generation aromatase inhibitors (AIs) are replacing tamoxifen as adjuvant therapy in postmenopausal women with hormone-sensitive breast cancer due to their superiority shown in several recent head-to-head trials. Healthy postmenopausal women normally experience age-related side effects, and in postmenopausal women with breast cancer, these symptoms may be exacerbated by adjuvant endocrine therapy. This review evaluates the current literature regarding bone health, lipid metabolism, cardiovascular disease, gynecologic health, and cognition in postmenopausal women receiving adjuvant AI therapy. The AIs – anastrozole, exemestane, and letrozole – are generally well tolerated: most adverse events are mild to moderate and common to menopause. Common short-term AI-associated toxicities are hot flushes, musculoskeletal complaints/arthralgia, and bone loss, all of which can be effectively managed. AIs may lack the cardioprotective and lipid-lowering effects of tamoxifen but, in contrast to tamoxifen, do not increase the risk of serious life-threatening thromboembolic or cerebrovascular events or endometrial cancer. Every patient should be individually assessed with respect to therapy risks and benefits. Lifestyle, comorbidities, and concomitant medications must be considered, and the importance of compliance to adjuvant therapy should be discussed before selecting a treatment regimen. The superior efficacy of adjuvant AI therapy will in most cases outweigh the risk of bothersome side effects that can be prevented or easily managed.