A Double-blind, Randomized, Multicentre Trial Comparing the Efficacy and Tolerability of 250mg of Faslodex (Long Acting ICI 182,780) With 20mg of Nolvadex (Tamoxifen) in Postmenopausal Women With Advanced Breast Cancer

The purpose of this study is to compare the efficacy of Faslodex (fulvestrant) to Nolvadex (tamoxifen) as first-line treatment for postmenopausal women with advanced breast cancer. Patients will be treated until disease progression or until the investigator has determined that treatment is not in the best interest of the patient, whichever occurs first.