Composition of peripheral blood progenitor cell components collected from healthy donors

BACKGROUND: Peripheral blood progenitor cell (PBPC) components are being collected from healthy donors for allogeneic transplantation, but the quantity, quality, composition, and variability of PBPCs collected from healthy people given granulocyte-colony-stimulating factor (G-CSF) have not been evaluated. STUDY DESIGN AND METHODS: PBPC components were collected from 150 healthy people who were given G-CSF (5, 7.5, or 10 microg/kg/day) for 5 days. The components were evaluated for white cell (WBC), mononuclear cell, CD34+ cell, neutrophil, platelet, and red cell (RBC) composition. RESULTS: The quantities collected were: WBCs, 35.0 +/− 16.4 × 10(9) (range, 11.9–163.3 × 10(9)); mononuclear cells, 33.3 +/− 14.4 × 10(9) (range, 11.9–139.6 × 10(9)); CD34+ cells, 412 +/− 287 × 10(6) (range, 70–1658 × 10(6)); neutrophils, 1.71 +/− 3.59 × 10(9) (range, 0–27.6 × 10(9)); RBCs, 7.2 +/− 4.0 mL (range, 0–22.1 mL); and platelets, 480 +/− 110 × 10(9) (range, 250–920 × 10(9)). PBPC components collected from people given G-CSF at 7.5 or 10 microg per kg per day contained significantly more CD34+ cells (respectively, 428 +/− 300 × 10(6); range, 70–1658 × 10(6) and 452 +/− 294 × 10(6); range, 78- 1380 × 10(6)) than those from people given G-CSF at 5 microg per kg per day (276 +/− 186 × 10(6); range, 91–767 × 10(6)) (p = 0.007 and p = 0.002). When 10 microg per kg per day of G-CSF was given, 50 percent of the components contained enough CD34+ cells for transplantation to a 75- kg recipient (375 × 10(6) CD34+ cells), but 10.6 percent of the components contained less than 150 × 10(6) CD34+ cells and thus would provide a transplantable dose only for a 30-kg patient. CONCLUSION: One PBPC component collected from a healthy donor given 7.5 or 10 microg per kg per day of G-CSF should contain 70 to 1660 × 10(6) CD34+ cells, with 0 to 22 mL of RBCs. Because of the great variability in the number of CD34+ cells collected, the quantity of CD34+ cells in each component should be measured after each procedure to ensure that sufficient quantities of cells are present for a successful transplant.