Breast cancer treatment has been constantly improving over the past decades and the consequences of this have been an increase in survival and improvements in the quality of life of these patients. The main reasons for this are early screening and diagnosis, more accurate characterization of mammary tumours by histopathological, molecular and genomic examination in order to obtain a personalized treatment, the emergence of new molecules for systemic treatment, the improvement of radiotherapy and the progress of surgical techniques.The "modern" history of breast cancer surgery begins, of course, with W. Halsted and the radical mastectomy type of surgery that bears his name, and which has been for nearly 50 years synonymous with the surgical treatment of breast cancer. This surgery represented the model to be followed for radical cancer treatment.Attempts at supraradical mastectomy proposed by DahlIversen, Wangesteen, and Urban did not improve survival, and were quickly abandoned due to increased morbidity and mortality. The transition from radical mastectomy to successive forms of modified mastectomy was surprisingly slow, with every change virtually representing a revolution, even if these changes in technique were not paradigm replacements, as they were in fact faithful to the same Halstedian concept of oncological radicality. Their common desideratum was complete axillary dissection, striving to achieve this by initially preserving the pectoralis major muscle, then both major and minor pectoralis muscles. Halsted mastectomy was replaced by Patey and afterwards by Madden technique, the latter being at present the most commonly used mastectomy type (1).