Abstract
Background
Osteosarcoma is the most frequent primary malignant bone tumor. In Europe and the United States, its prognosis has been greatly improved by the use of multimodal treatment, including preoperative and postoperative chemotherapy as well as surgery. In Japan, however, only a few clinical studies on osteosarcoma have been carried out.
Methods
To evaluate the efficacy of neoadjuvant chemotherapy on nonmetastatic, operable osteosarcoma arising in the extremities, a prospective multiinstitutional phase II trial, the Neoadjuvant Chemotherapy for Osteosarcoma (NECO) study, was conducted. Preoperative chemotherapy included high-dose methotrexate (HD-MTX), cisplatin (CDDP), and adriamycin (ADR). If the induction therapy was assessed as not effective, high-dose ifosfamide (IFO) was added to the chemotherapy regimen. A total of 124 patients were enrolled in this trial, and ultimately 113 patients were eligible.
Results
The 5-year overall survival (OAS) and event-free survival (EFS) rates in the NECO study were 77.9% and 65.5%, respectively. A good histological response to the induction chemotherapy resulted in favorable OAS (78.7%). The patients assessed as poor histological responders with progressive disease after the induction chemotherapy exhibited comparable outcomes (OAS 89.5%, EFS 68.2%). There were no significant differences between the OAS and EFS rates of the patients in terms of response to preoperative chemotherapy.
Conclusions
We analyzed the results of the intensive neoadjuvant chemotherapy and the effects of adding IFO on patients with osteosarcoma in Japan. The results suggest efficacy of the high-dose IFO addition to the standard three-drug chemotherapy regimen. However, a randomized clinical study is needed to establish the true impact of IFO on patients with osteosarcoma.
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Japan Bone Tumor Chemotherapy Study Group
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Iwamoto, Y., Tanaka, K., Isu, K. et al. Multiinstitutional phase II study of neoadjuvant chemotherapy for osteosarcoma (NECO study) in Japan: NECO-93J and NECO-95J. J Orthop Sci 14, 397–404 (2009). https://doi.org/10.1007/s00776-009-1347-6
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DOI: https://doi.org/10.1007/s00776-009-1347-6