Accelerated Partial Breast Irradiation Versus Standard or Hypofractionated Whole-Breast Irradiation, in Early Breast Cancer, After Breast-conserving Surgery

The investigators propose a prospective, randomized, pilot study, with active control, to evaluate the viability and safety of accelerated partial breast irradiation, in 5 fractions, comparing with the radiotherapy regimens of the whole breast in 15 and 5 fractions, in patients with breast cancer, in initial stage, who underwent conservative surgery.