[Mesenchymal breast sarcomas. Apropos of 25 cases].

Breast sarcoma are rare, representing 1% of all malignant breast tumours. This is a retrospective study of 25 patients with a breast sarcoma, treated at Institut Gustave Roussy from 1954 to 1981. Thirty six per cent of these arose in a cystosarcoma phyllodes. A variety of histologies were found, the main one being malignant fibrohistiocytoma (44%). Nodal involvement was rare (4%) and, as in other sarcoma, hematogenous spread of metastases was more usual. Local recurrence occurred in 44% of cases and distant metastases (usually pulmonary) in 24%. The 3 year disease-free survival was 60% and the major prognostic factor was the mitotic index. Surgery is the treatment of choice of these tumours, supplemented by local irradiation in those cases where only a tumorectomy has been performed. The role of adjuvant chemotherapy remains undefined.