Clinical Cancer Research, Vol 4, Issue 2 311-316, Copyright © 1998 by American Association for Cancer Research

ARTICLES

Factors affecting mobilization of peripheral blood progenitor cells in patients with lymphoma

CH Moskowitz, JR Glassman, D Wuest, P Maslak, L Reich, A Gucciardo, N Coady-Lyons, AD Zelenetz and SD Nimer
Department of Medicine, Memorial Sloan-Kettering Cancer Center, New York, New York 10021, USA. moskowic@mskcc.org

The objective of this study was to identify factors associated with poor mobilization of peripheral blood progenitor cells (PBPCs) or delayed platelet engraftment after high-dose therapy and autologous stem cell transplantation in patients with lymphoma. Fifty-eight patients with Hodgkin's disease or non-Hodgkin's lymphoma underwent PBPC transplantation as the "best available therapy" at Memorial Sloan-Kettering Cancer Center (New York, NY) between 1993 and 1995. PBPCs were mobilized with either granulocyte colony-stimulating factor (G-CSF) alone (n = 19) or G-CSF following combination chemotherapy (n = 39). Forty-eight of these patients underwent a PBPC transplant, receiving a conditioning regimen containing cyclophosphamide, etoposide, and either total body irradiation, total lymphoid irradiation, or carmustine. A median number of 4.6 x 10(6) CD34+ cells/kg were obtained with a median of three leukapheresis procedures. Mobilization of PBPCs using chemotherapy plus G-CSF was superior to G-CSF alone (6.7 x 10(6) versus 1.5 x 10(6) CD34+ cells/kg; P = 0.0002). Poorer mobilization of progenitor cells was observed in patients who had previously received stem cell-toxic chemotherapy, including (a) nitrogen mustard, procarbazine, melphalan, carmustine or > 7.5 g of cytarabine chemotherapy premobilization (2.0 x 10(6) versus 6.0 x 10(6) CD34+ cells/kg; P = 0.005), or (b) > or = 11 cycles of any previous chemotherapy (2.6 x 10(6) versus 6.7 x 10(6) CD34+ cells/kg; P = 0.02). Platelet recovery to > 20,000/microliter was delayed in patients who received < 2.0 x 10(6) CD34+ cells (median, 13 versus 22 days; P = 0.06). Patients who received > or = 11 cycles of chemotherapy prior to PBPC mobilization tended to have delayed platelet recovery to > 20,000/microliter and to require more platelet transfusions than less extensively pretreated patients (median, 13.5 versus 23.5 days; P = 0.15; median number of platelet transfusion episodes, 13 versus 9; P = 0.17). These data suggest that current strategies to mobilize PBPCs may be suboptimal in patients who have received either stem cell-toxic chemotherapy or > or = 11 cycles of chemotherapy prior to PBPC mobilization. Alternative approaches, such as ex vivo expansion or the use of other growth factors in addition to G-CSF, may improve mobilization of progenitor cells for PBPC transplantation.

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