In the present work is to determine the therapeutic regimens of choice for breast cancer oncology unit mixes the Regional Institute of Neoplastic Diseases "Dr. Luis Pinillos Ganoza "with the objective of determining therapeutic regimens of choice for breast cancer oncology unit mixtures (SMO) of the Regional Institute of Neoplastic Diseases, identify patterns of cancer treatment of choice for breast cancer service Regional chemotherapy of Neoplastic Diseases Institute North, determine the frequency of use quarterly treatment regimens, as Pareto's law, in breast cancer chemotherapy service, classify most widely used regimens in chemotherapy breast Cancer chemotherapy service. To which we conducted a cross-sectional study, which included retrospective inpatients affiliated comprehensive health system during the period January to December 2012. We found that paclitaxel scheme, was the first...