Randomized study of systemic chemotherapy following complete excision of nonosseous sarcomas

Abstract

Between June 1975 and April 1981, 61 of the 177 eligible patients whose nonosseous sarcomas of extremity or trunk origin had been completely excised primarily or after local recurrences agreed to participate in a randomized study of adjuvant chemotherapy. Dermatofibrosarcoma, lymphomas, myeloma, Kaposi's sarcoma, and embryonal rhabdomyosarcoma were excluded as were patients with significant second primary cancers and those who received either preoperative or postoperative radiation therapy. After stratification by anatomic status of disease, site of origin, and histologic grade, a random one half of the 61 participants began alternating courses of vincristine/cyclophosphamide/dactinomycin, and vincristine/doxorubicin/dacarbazine at six-week intervals for one year. The control group was evaluated at six-week intervals without adjuvant chemotherapy, but these patients were offered this chemotherapy later if they had progressive disease excised. Although 30% of the 61 patients experienced local recurrence of disease within the first five years after randomization, and only 54% were continuously disease free for five or more years, 82% were surviving at five years (Kaplan-Meier calculations) with a median follow-up of 64.3 months. Partial suppression of distant metastasis by adjuvant chemotherapy was apparent in the overall study, in the extremity tumor category, and in the subgroup of patients who had received limb-sparing surgery; however, no survival advantage for chemotherapy-treated patients was demonstrated. The 30 adjuvant chemotherapy-treated patients received a total of three thoracotomies as compared with 17 salvage thoracotomies for the 31 control patients; however, salvage surgery for local recurrences has been similar in the two groups. Recent improvement in the survival of patients with soft-tissue sarcomas is not necessarily a result of adjuvant chemotherapy or radiation therapy.