Progenitor cell numbers (CFU-GM, CFU-D, and CFU-Mix) and hemopoietic recovery following autologous marrow transplantation

Abstract

Forty-one consecutive patients were treated with high-dose chemotherapy with or without total body irradiation followed by autologous marrow transplantation. Four treatment regimens of varying intensity were used. Every patient's harvested marrow was evaluable for nucleated cell and progenitor cell loss during the cell separation and cryopreservation process. Of the 41 patients, 38 were evaluable for peripheral blood count recovery. Multivariate analysis of colony-forming cell assays and recovery of neutrophils and platelets showed a significant association with absolute numbers of post-thaw mixed colony-forming units (CFU-Mix) infused (p less than 0.002). Prefreeze CFU-Mix also correlated with recovery to a lesser degree, as did absolute numbers of nucleated cells. The number of diffusion chamber colony-forming units (CFU-D) prefreeze, but not post-thaw infused into the patient, was associated with recovery of neutrophils (p = 0.0001), but not platelets. When the precursor cell numbers were adjusted for body weight, post-thaw CFU-Mix showed the best correlation with recovery of both platelets and neutrophils. Prefreeze CFU-D per kg was also associated with recovery of neutrophils (p = 0.02). To some extent nucleated cells per kg predicted for recovery with neutrophils and platelets (p less than 0.05). When analyzed according to treatment regimen, cyclophosphamide-BCNU-VP16 (CBV) or cyclophosphamide-total body irradiation (CY/TBI) was associated with prolonged recovery compared to cyclophosphamide-adriamycin-vinblastine (CAV) or etoposide-cyclophosphamide (EC). In this setting only CFU-D number predicted neutrophil recovery (p less than 0.002). We conclude that determination of the number of total nucleated cells, CFU-D, and CFU-Mix, before cryopreservation of the sample is important in predicting hemopoietic reconstitution in autologous bone marrow transplantation.