Aromatase inhibitors for the endocrine adjuvant treatment of breast cancer.

Discusses the use of tamoxifen and aromatase inhibitors to treat breast cancer. Use of aromatase inhibitors to block the aromitization of precurseors to estrogen in postmenopausal women and reduce systemic estrogen levels; Reference to a study in this issue which compares the aromatase inhibitor anastrozole with tamoxifen, as well as studies the effectiveness of a combination of the agents; Possible side effects of anastrozole.