title: Impact of mobilized blood progenitor cell quality determined by the CFU-GM/CD34+ ratio on rapid engraftment after blood stem cell transplantation.
abstract: To find a parameter to predict the quality of collected mobilized CD34+ blood as hemopoietic reconstituting cells, the ratio of CFU-GM to CD34+ cells was examined. One hundred six consecutive patients who underwent blood stem cell transplantation at the University of Rochester from 01/01/99 to 12/31/99 were examined retrospectively for the number of days to reach an absolute neutrophil count of 500 or 1000 cells/microl and an absolute platelet count of 20,000 or 50,000 cells/microl without transfusion support as measures of engraftment. Linear regression analyses were conducted to determine factors influencing engraftment. The number of CD34+ cells/kg and CFU-GM/kg correlated highly with the number of nucleated blood cells/kg. In this population, in which 90% of patients received >2 x 10(6) CD34+ cells/kg, neither the number of CD34+ cells/kg nor the number of CFU-GM/kg correlated with the time to engraftment as judged by neutrophil or platelet levels. In contrast, the lower the ratio of CFU-GM to CD34+ cells, the more rapid the reconstitution of platelets to 20,000/microl (P = 0.03) and 50,000/microl (P = 0.02). Thus, a lower ratio of the CFU-GM/CD34+ appended to reflect a greater number of hematopoietic reconstituting cells in the blood cell collection. The CFU-GM/CD34+ ratio is an apparent predictor of earlier platelet engraftment, suggesting that the ratio reflects the engraftment potential of mobilized donor progenitor cells.
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D018952:Antigens, CD34 / Q000032:analysis; D001772:Blood Cell Count; D002648:Child; D002675:Child, Preschool; D015331:Cohort Studies; D006085:Graft Survival; D006410:Hematopoiesis; D019650:Hematopoietic Stem Cell Mobilization / Q000592:standards*; D006412:Hematopoietic Stem Cells / Q000166:cytology*; D006801:Humans; D007223:Infant; D007700:Kinetics; D008875:Middle Aged; D009369:Neoplasms / Q000628:therapy; D036102:Peripheral Blood Stem Cell Transplantation / Q000592:standards*; D011379:Prognosis; D012044:Regression Analysis; D012189:Retrospective Studies
chemical_list: D018952:Antigens, CD34