Extraskeletal osteosarcoma in Japan: multiinstitutional study of 20 patients from the Japanese Musculoskeletal Oncology Group

Among the patients with extraskeletal osteo-sarcoma, both the 5-year survival rate and the chemotherapy response rate tended to improve in this study in comparison to the findings published in previous reports. As a result, we believe that treatment regimens that include systemic chemotherapy may be able to improve the prognosis in patients with extraskeletal osteosarcoma.