DISEASE CHARACTERISTICS: Histologically proven breast carcinoma in one of the following categories: 10 or more involved axillary nodes 5 or more involved axillary nodes and either: Primary tumor estrogen receptor (ER)-negative (less than 10 femtomoles per milligram of cytosol protein) T3 tumor (regardless of ER status) Total mastectomy or breast-conserving procedure (lumpectomy or quadrantectomy) required within 6 weeks prior to randomization Tumor confined to breast and axillary nodes (T1a-c, T2, or T3, N1-2, M0 by the UICC staging system) The following conditions exclude entry: Satellite skin nodules distant from the primary tumor Supraclavicular node involvement Inoperable, matted axillary nodes Fixation of primary tumor to chest wall (excluding pectoralis major) Bilateral breast cancer (any mass in opposite breast unless biopsy-proven benign) Hot spots on bone scintigram (unless confirmed to be benign) Skeletal pain of unknown cause Hormone receptor status: ER status determination preferred, but not required