One of the chief concerns of the medical staff of the Institut Gustave-Roussy is to find the right indications for treating every cancer site, and particularly cancer of the breast. The best treatment is the one which offers the patient the best chance of recovery, yet is at the same time the simplest and least mutilating [36]. It is our policy at the Institut, rather than to lay down a series of therapeutic measures which are applied systematically to all patients, to be selective, that is, to determine the best treatment for each individual patient. We make extensive use of prognostic...