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The National Cancer Institute of Canada Clinical Trials Group MAP.3 trial: an international breast cancer prevention trial.

Abstract
Several large phase III trials have demonstrated that tamoxifen-and more recently, raloxifene-can effectively reduce the incidence of invasive breast cancer by 50%. However, these selective estrogen receptor modulators can also be associated with several rare, but serious, adverse events. Recently, the third-generation aromatase inhibitors (AIS) have demonstrated excellent efficacy in adjuvant breast cancer trials, and they show particular promise in the breast cancer prevention setting. The National Cancer Institute of Canada Clinical Trials Group (NCIC CTG) has developed a randomized phase III study to determine the efficacy of an ai (exemestane) to reduce the incidence of invasive breast cancer in postmenopausal women at an increased risk for developing breast cancer. The NCIC CTG map.3 (ExCel) trial is a double-blind placebo-controlled multicentre, multinational trial. Based on the known preclinical and clinical profile of the ais, a greater reduction in breast cancer incidence with fewer side effects is hypothesized with this class of agents than with tamoxifen or raloxifene.
AuthorsH Richardson, D Johnston, J Pater, P Goss
JournalCurrent oncology (Toronto, Ont.) (Curr Oncol) Vol. 14 Issue 3 Pg. 89-96 (Jun 2007) ISSN: 1198-0052 [Print] Canada
PMID17593981 (Publication Type: Journal Article)

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