110 of 126 patients treated with Halsted mastectomy and postoperative loco-regional radiotherapy, during period 1961-1969 have been controlled. Overall 5 years survival resulted as following: Columbia Clinical Classification stage A 90,6%, stage B 66,6%, stage C 28,5%, stage D 33,3%; 10 years survival in patients operated on in the period 1961-64 was: stage A 69,2%, stage B 53,3%, stage C 40%, stage D 0%. On the basis of the satisfing results obtained the authors conclude that it appears by now unjustified to modify this method in treating stage A and B breast cancer either utilizing less extended resections, or renoncing to the postoperative irradiation.