Efficiency and toxicity of mifamurtid in childhood osteosarcoma.

Abstract

e22010 Background: There are only few data concerning efficiency and toxicity of mifamurtide in children with osteosarcoma (OS). The aim of this study was to evaluate efficiency and side effects of mifamurtide in childhood OS. Methods: We retrospectively analyzed the data of 18 patients with OS and who received mifamurtide between January 2012 and December 2016. Four hundred seventy seven doses of 2 mg/m2intravenous mifamurtide, along with paracetamol premedication were given in 15 patients with primary non-metastatic OS after complete surgical resection and 3 patients with progressive OS. Results: There were 11 males and 7 females, and the median age was 14 years (ranged, 9-18). The median follow-up time was 20 months (ranged, 7-51). The metaphyseal plates around the knee was the most frequent disease location with 94.4%. The median necrosis percentage was 94 (range, 35-100). All patients received Euromos protocol. The most common side effects were chills and fever (17/18). These reactions were observed in 4 patients during every administration, in only one patient at last administration and in the remaining 12 patients during first or first two administration. Headache, myalgia and arthralgia were observed in 2 patients during every infusion. In another one case, headache was observed during only first two infusions and he also hearing loss was developed (could be related CisPlatin) Back pain was observed in two patient during first infusion but one them suffered with severe back pain after few doses and stoped Mifamurtid. . Grade 3-4 neutropenia, trombocytopenia, abnormal liver enzymes and abnormal BUN and creatinin levels were not observed in patients who received mifamurtide alone after completion of chemotherapy. Of the 15 patients with primary non-metastatic OS treated with the addition of mifamurtide to chemotherapy, 13 showed complet remission for median 24 months (ranged,16-36) and 2 patients are still under treatment with complet remission. Of the 3 patients with progressive disease, 2 died and 1 had progressive disease for 51 months. Conclusions: Mifamurtide therapy is safe and well tolerated in childhood OS. Chills and fever were the major side effects, These events were transient and often no longer observed in subsequent administrations.