PRIMARY CHEMOTHERAPY AND RADIOSURGICAL BREAST-CONSERVING TREATMENT FOR PATIENTS WITH LOCALLY ADVANCED OPERABLE BREAST CANCERS

Purpose: The traditional surgical treatment for operable breast cancer larger than 3 cm is mastectomy. In order to avoid mutilating surgery, we administered primary chemotherapy to 80 patients with operable non metastatic large breast cancer T2 > 3 cm and T3, NO-N1. The purpose of the study was to evaluate the breast-conserving rate induced by this treatment strategy and determine if it is a safe alternative for women with locally advanced breast carcinomas that are responders to an induction chemotherapy. Methods and Materials: The mean age was 50.1 years. Forty-three patients were T2 > 3 cm, 37 were T3. Twenty-six were NO and 54 were Nl. Mean tumor size was 5.4 cm. Patients were treated with three courses of the MVCF regimen (Mitoxantrone, Vindesin, Cyclophosphamide, and 5 Fluorouracil) every 4 weeks and then with a radiosurgical combination. Results: The overall response rate to induction chemotherapy was 51% with 17.5% complete tumor regression. Twenty-one percent of the patients developed grade 3 or 4 chemotherapy toxic effects, all acceptable and reversible. Breast-conserving treatment was feasible in 42.5% (34/80). Twenty patients (25%) were treated with a radiosurgical combination (tumorectomy + radiation therapy), 14 (17.5%) with radiotherapy alone (external irradiation and brachytherapy). Age, tumor stage, histology, hormonal status, hormonal receptors rate had no influence on the frequency of the observed regressions. Isolated recurrences occurred in five patients, two conservatively treated and three treated with mastectomy. Metastatic relapses were observed in 20 patients (12% in the responders and 38.5% in the non responders to chemotherapy) (p < 0.02). Five-year actuarial survival was 73% and was significantly better for responders to the induction treatment. Conclusion: These results suggest that primary chemotherapy and radiosurgical breast conserving treatment is a safe alternative to mastectomy for patients with locally advanced operable breast cancer. The long-term benefit of this strategy must be evaluated in well designed controlled trials.