Neoadjuvant chemotherapy in malignant fibrous histiocytoma of bone and in osteosarcoma located in the extremities: analogies and differences between the two tumors

Annals of Oncology : Official Journal of the European Society for Medical Oncology
P PicciM Mercuri

Abstract

Malignant fibrous histiocytoma (MFH) is a rare bone tumor usually treated like osteosarcoma. Studies on analogies and differences between the two tumors have seldom been reported. Between March 1982 and December 1994, 51 patients with high-grade MFH of bone and 390 with high-grade osteosarcoma were treated with the same regimen of neoadjuvant chemotherapy. All of the tumors in both groups were located in the limbs. Preoperative chemotherapy was performed according to three different, successively activated, regimens consisting of MTX/CDP intraarterially, MTX/CDP/ADM, and MTX/CDP/ADM//IFO. The rate of limb salvage was the same in both the MFH (92%) and osteosarcoma (85%) patients. MFH showed a statistically significantly lower rate of good histologic response, 90% or more tumor necrosis (27% vs. 67%, P = 0.00001) for all three regimens. Despite this low chemosensitivity, the disease-free survivals of the two neoplasms were similar (67% vs. 65%). In terms of histologic response to primary chemotherapy, MFH has a lower chemosensitivity than osteosarcoma. Nevertheless, the two tumors have similar prognoses when treated with chemotherapy regimens based on MTX, CDP, ADM and IFO.

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