Transfusion 2014 Feb 19;54(2):331-9. Epub 2013 Jun 19.
Section of Hematology and BMT Unit, Cremona Hospital, Cremona, Italy; Department of Hematology and Oncological Sciences, Institute of Hematology "L. & A. Seràgnoli", University of Bologna, Bologna, Italy; Section of Hematology, University Hospital of Ancona, "Ospedali Riuniti", Ancona, Italy; Hemato-Oncology Unit, Istituto Europeo Oncologico, Milan, Italy; Section of Hematology, Reggio Calabria Hospital, Reggio Calabria, Italy; Section of Hematology, University Hospital of Bari, Bari, Italy; Section of Hematology, Tricase Hospital, Tricase, Italy; Section the of Hematology, Rimini Hospital, Rimini, Italy; Section of Hematology, University Hospital Ferrarotto, Policlinico Vittorio Emanuele, Catania, Italy; Section of Hematology, Humanitas Hospital; BMT Unit, S. Raffaele Hospital, Milan, Italy; Section of Hematology, Hospital Casa Sollievo Sofferenza, S. Giovanni Rotondo, Italy; Section of Hematology, Bergamo Hospital, Bergamo, Italy; Section of Hematology and BMT Unit, University Hospital "Careggi", Florence, Italy.
Background: Although the efficacy of plerixafor in peripheral blood stem cell (PBSC) mobilization has been explored in several studies, factors associated with successful plerixafor mobilization after administration of granulocyte-colony-stimulating factor (G-CSF), with or without chemotherapy, have not been investigated. We analyzed data on PBSC mobilization from a large Italian database of lymphoma and myeloma plerixafor-treated patients.
Study Design And Methods: Two endpoints were established to define successful mobilization: patients with at least 2 × 10(6) CD34+ cells/kg collected by three leukapheresis procedures and patients achieving a peak count of at least 20 × 10(6) CD34+ cells/L during mobilization.
Results: Plerixafor achieved successful mobilization in both predicted (n = 64) and proven poor mobilizers (PMs; n = 143), classified according to the Gruppo Italiano Trapianto di Midollo Osseo (GITMO) criteria. Successful mobilization was independent of type of mobilization (steady state or chemotherapy); age; sex; disease; number or type of chemotherapy regimens preceding plerixafor; radiation therapy; prior treatment with melphalan, carmustine, lenalidomide, and radioimmune conjugates; and laboratory variables. Multivariate analysis identified previous fludarabine treatment and premobilization platelet count as predictors of successful mobilization.
Conclusion: This large, prospective, nationwide study confirmed plerixafor efficacy for mobilizing PBSCs when added to G-CSF with or without chemotherapy. Plerixafor can overcome negative effects of most predictors of poor mobilization to achieve satisfactory harvest both in predicted and proven PM.