OUTLINE: This is a randomized, multicenter study. Patients are stratified according to participating center, number of positive nodes (1-3 vs 4-9 vs at least 10), sequential tamoxifen or anastrozole administration (yes vs no), and type of prior surgery and radiotherapy plan (mastectomy with no local or regional radiotherapy vs mastectomy with local and/or regional radiotherapy vs lumpectomy with local radiotherapy vs lumpectomy with local and regional radiotherapy). Patients are randomized to one of three treatment arms.