- Patients must be registered within 84 days of the last breast surgery; patients must have undergone either modified radical mastectomy or lumpectomy; for patients undergoing sentinel node sampling or axillary dissection a simple mastectomy is acceptable; lumpectomy patients must receive radiation therapy; for patients treated with radiation therapy prior to chemotherapy, the patients should be registered on this study after the conclusion of radiation, with chemotherapy administration beginning within 7 days of registration