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  • Title: Phase 1 study of pegylated recombinant human megakaryocyte growth and development factor (PEG-rHuMGDF) in breast cancer patients after autologous peripheral blood progenitor cell (PBPC) transplantation.
    Author: Bolwell B, Vredenburgh J, Overmoyer B, Gilbert C, Chap L, Menchaca DM, Cruickshank S, Glaspy J.
    Journal: Bone Marrow Transplant; 2000 Jul; 26(2):141-5. PubMed ID: 10918423.
    Abstract:
    Forty-seven patients with stage II, III, or IV breast cancer undergoing autologous peripheral blood progenitor cell (PBPC) transplantation were randomized to placebo (n = 13) or to one of five sequential dose cohorts of pegylated (PEG) recombinant human megakaryocyte growth and development factor (PEG-rHuMGDF) (1.0, 2.5, 5.0, 7.5, or 10.0 microg/kg/day) (n= 34). Blinded study drug was started on the day of transplantation and was continued until the platelet count was > or =100 x 109/l or a maximum of 21 days. PBPCs were mobilized with filgrastim (r-metHuG-CSF) and all patients received filgrastim starting on day +2 after transplantation. The nadir platelet count was not affected by treatment. The median time to platelet recovery was 11 and 12 days for the placebo and combined PEG-rHuMGDF groups, respectively. No trends in adverse events suggested dose- or treatment-related toxicity. Two patients withdrew from the study because of an adverse event (allergic reaction in the 7.5 microg/kg group) probably related to study drug, and veno-occlusive disease (VOD) (in the 5 microg/kg group) which was felt not to be related to study drug by the investigator. No patients developed neutralizing antibodies to MGDF. Day +21 and day +28 platelet counts were higher in the group receiving PEG-rHuMGDF (246 vs 148 x 109/l and 299 vs 145 x 109/l, respectively; both P < 0. 05). PEG-rHuMGDF up to 10 microg/kg/day was well tolerated. In this study, there was no effect of study drug on initial platelet engraftment at the doses studied. However, the efficacy of other doses is unknown.
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