[Surgical treatment of breast cancer. Present problems (author's transl)].

The protocol of surgical treatment of breast cancer at the Institut Gustave-Roussy is presented. The long-term results concerning 1,002 patients treated according to this protocol are reported. Considering these results, the place of extended mastectomy and of conservative procedures is discussed. The necessity of randomized trails to appreciate the real value of the different treatements is emphasized, and two international trials proposed by the Institut Gustave-Roussy are briefly described.