title: Hourly monitoring of circulating CD34+ cells to optimize timing of autologous apheresis in pediatric patients.
abstract: In order to increase the CD34+ cell yield in children undergoing autologous stem cell transplantation, the optimum time of apheresis after G-CSF administration has still to be found. We prospectively studied the mobilization of CD34+ cells and white blood cells in the peripheral blood (PB) of 20 pediatric patients before leukapheresis. The monitoring schedule covered 12 h, with blood samples taken before and at 2, 4, 5, 6, 7, 8, 10 and 12 h after G-CSF administration when 10 CD34+ cells/mul were reached. CD34+ cells were measured by flow cytometric analysis both in the single- and dual-platform setting. Two different patterns of mobilization (POM) emerged: 12 patients showed an increase in CD34+ cells in PB during the first 4 h after G-CSF (POM I), while eight patients had an initial decrease of CD34+ cells. However, all patients together showed a significant increase of CD34+ cells about 10 h after G-CSF administration. Further studies with more patients, using an enhanced monitoring schedule will be required to refine the results.
authors.affiliation: Pediatric Hematology and Oncology of Johann Wolfgang Goethe University, Theodor-Stern-Kai 7, Frankfurt am Main, Germany.
authors.forename: K
authors.initials: K
authors.lastname: Bochennek
authors.forename: C
authors.initials: C
authors.lastname: Andreas
authors.forename: C
authors.initials: C
authors.lastname: Margraf
authors.forename: H
authors.initials: H
authors.lastname: Stahlkamp
authors.forename: S
authors.initials: S
authors.lastname: Zimmermann
authors.forename: R
authors.initials: R
authors.lastname: Esser
authors.forename: D
authors.initials: D
authors.lastname: Schwabe
authors.forename: T
authors.initials: T
authors.lastname: Klingebiel
authors.forename: H-P
authors.initials: HP
authors.lastname: Grüttner
authors.forename: U
authors.initials: U
authors.lastname: Koehl
mesh_terms: D000293:Adolescent; D018952:Antigens, CD34; D002648:Child; D002675:Child, Preschool; D005260:Female; D005434:Flow Cytometry; D016179:Granulocyte Colony-Stimulating Factor / Q000008:administration & dosage; D019650:Hematopoietic Stem Cell Mobilization; D018380:Hematopoietic Stem Cell Transplantation / Q000379:methods / Q000592:standards; D006412:Hematopoietic Stem Cells / Q000166:cytology*; D006801:Humans; D007223:Infant; D007700:Kinetics; D007937:Leukapheresis / Q000379:methods* / Q000592:standards; D007958:Leukocyte Count; D008297:Male; D013997:Time Factors; D014182:Transplantation, Autologous
chemical_list: D018952:Antigens, CD34; D016179:Granulocyte Colony-Stimulating Factor