During the 54-year period between 1927 and 1981, at least 4,290 patients with breast cancer treated with lumpectomy and/or radiotherapy as the primary therapeutic modality have been described. In all but two of the 24 reported studies, survival rates, even to 30 years, were similar to those of patients treated with variations of radical mastectomy, and the cosmetic result following treatment that preserved the affected breast was judged good to excellent by 81 to 85 percent of the patients so treated. The two exceptions were both in series of patients treated with doses of radiation known to be inadequate by current standards. We all have the responsibility of offering our patients the most effective treatment available with the fewest possible short-term and long-term side effects. This goal requires a constant, careful reevaluation of our treatments and results, as well as an open mind. According to available data, the combination of lumpectomy, axillary node dissection, external beam radiotherapy and iridium implant constitutes an acceptable alternative to mastectomy as treatment for primary cancer of the breast.