PMID: 11916231Mar 28, 2002Paper

Preliminary data from ongoing adjuvant aromatase inhibitor trials

Clinical Cancer Research : an Official Journal of the American Association for Cancer Research
Paul E Goss

Abstract

With recent results showing letrozole and anastrozole to be superior to tamoxifen as initial therapy for advanced disease, the aromatase inhibitors are poised to establish their place in the adjuvant therapy of postmenopausal receptor-positive breast cancer. A review of the rationale, design, and preliminary results of the ongoing adjuvant trials that include aromatase inhibitors will be presented, along with the ongoing or planned substudies. Two strategies employing aromatase inhibitors after tamoxifen are being evaluated. The MA.17 international intergroup trial is randomizing postmenopausal patients who are disease-free after 5 years of adjuvant tamoxifen to an additional 5 years of letrozole or placebo. In a similar design, the National Surgical Adjuvant Breast and Bowel Project (NSABP) B33 trial is randomizing this patient population to 2 years of exemestane or placebo after the standard 5 years of adjuvant tamoxifen. The second approach under study is the use of both aromatase inhibitor and tamoxifen in sequence within the first 5 postoperative years. The International Cancer Collaboration Group (ICCG) trial is comparing 2 years of exemestane after 3 years of tamoxifen to a standard 5-year course of tamoxifen. Similarly,...Continue Reading

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