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Abstract
Antagonizing estrogen by inhibition of aromatase has become a mainstay of adjuvant endocrine therapy in women with hormone receptor positive (ER+) breast cancer. Recent trials have shown an incremental gain for the AIs over tamoxifen when given as an up-front alternative to tamoxifen, but additionally added benefit is achieved by giving them in sequence with tamoxifen after either an early switch (2–3 years) or as a late switch (5 years). The true clinical implications of accelerated bone resorption from AIs is becoming better understood and its management defined. AI minimally effect quality of life. The chronic relapsing nature of ER+ breast cancer implies long term therapy will be of benefit in selected patients. Outstanding issues under investigation include optimal duration of endocrine therapy, optimal sequence, optimal agents and whether combining anti-estrogens will yield advantage. The role of AIs is also under investigation in premenopausal women in combination with ovarian function suppression. Identifying prognostic and predictive factors of endocrine therapy is important as is the identification and overcoming of resistance mechanisms. Both tumor and host signatures are being pursued to this end. Optimizing, expanding and extending endocrine therapy is likely to add further to patient outcome.
Published Version
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