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    Baseline platelet count has been shown to be a sensitive predictor of autologous peripheral blood progenitor cell collection yield in patients with multiple myeloma mobilized with granulocyte colony-stimulating factor (G-CSF). Patients who mobilize poorly with G-CSF are often treated with plerixafor to enhance mobilization. There are no surrogate markers available to predict response to plerixafor. We retrospectively analyzed data from 73 patients with multiple myeloma who did not have adequate mobilization with G-CSF alone and were treated with plerixafor as a rescue agent. We found that baseline platelet count directly correlated with peripheral blood CD34+ (PB-CD34+) count after plerixafor treatment (r = 0.36, P < 0.0001) and the number of PB-CD34+ cells collected on the first day of apheresis and inversely correlated with the number of apheresis sessions needed to collect the target number of PB-CD34+ cells (P = 0.0015). Baseline platelet count of 153 000/µL or less was associated with 90% specificity of predicting poor response to plerixafor with a sensitivity of 33%. Baseline platelet count is a good predictor of mobilization response to plerixafor in patients with multiple myeloma. Copyright © 2019 International Society for Cell and Gene Therapy. Published by Elsevier Inc. All rights reserved.


    Mohammed Bakeer, Abba C Zubair, Vivek Roy. Low baseline platelet count predicts poor response to plerixafor in patients with multiple myeloma undergoing autologous stem cell mobilization. Cytotherapy. 2020 Jan;22(1):16-20

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    PMID: 31879152

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