title: CD34-positive cell proportions in peripheral blood correlate with colony-forming capacity.
abstract: Blood samples were examined from 25 children with malignancies during hematopoietic recovery following chemotherapy-induced aplasia and from 9 children undergoing tonsillectomy. The proportion of CD34-positive peripheral blood mononuclear cells (PBMNC) evaluated by flow cytometry was compared with the number of colonies (granulocyte-macrophage colony-forming units, CFU-GM; mixed-lineage colony-forming units, CFU-GEMM; and erythroid burst-forming units, BFU-E) grown in methylcellulose medium within 2 weeks. A mean of 1387 myeloid colonies (495-4480) per 10(5) PBMNC seeded developed from 13 samples with detectable CD34 populations (between 0.9% and 5.6%), whereas only 152 (9-386, p = 0.002) and 65 (12-137, p = 0.005) colonies were formed from 12 patient and from 9 control samples in which the percentage of CD34-positive cells was too low for analysis. Linear regression analysis revealed that CD34 positivity correlates with colony-forming capacity (p = 0.0008, r = 0.782). Flow cytometric evaluation of the CD34 proportions can thus predict the in vitro colony-forming capacity of peripheral blood prior to leukapheresis.
authors.affiliation: Children's Cancer Research Institute, St. Anna Children's Hospital, Vienna, Austria.
authors.forename: G
authors.initials: G
authors.lastname: Fritsch
authors.forename: W
authors.initials: W
authors.lastname: Emminger
authors.forename: P
authors.initials: P
authors.lastname: Buchinger
authors.forename: D
authors.initials: D
authors.lastname: Printz
authors.forename: H
authors.initials: H
authors.lastname: Gadner
mesh_terms: D000293:Adolescent; D015703:Antigens, CD / Q000032:analysis*; D018952:Antigens, CD34; D001854:Bone Marrow Cells; D002478:Cells, Cultured; D002648:Child; D002675:Child, Preschool; D003114:Colony-Forming Units Assay; D015672:Erythroid Precursor Cells / Q000276:immunology; D005260:Female; D005434:Flow Cytometry; D006098:Granulocytes / Q000276:immunology; D006410:Hematopoiesis / Q000276:immunology; D006801:Humans; D008264:Macrophages / Q000276:immunology; D008297:Male; D009000:Monocytes / Q000276:immunology*; D012044:Regression Analysis
chemical_list: D015703:Antigens, CD; D018952:Antigens, CD34