[en] Under consideration are the problems of preoperative radiotherapy for breast cancer patients with the use of 27 MeV electron beams and 17.5 and 27.5. MeV accelerator LEA-25 bremsstrahlung radiation. The method for shaping figure fields was elaborated taking into account some individual anatomical features to provide simultaneous irradiation of all areas of regional metastases. Clinical testing of the suggested method for fast electron beams has demonstrated the treatment to be adequately tolerated and also the absence of grave reactions during it as well as of the immediate and early radiation complications. The time of preoperative radiotherapy was made twice shorter