title: Use of total leukocyte and platelet counts to guide stem cell apheresis in healthy allogeneic donors treated with G-CSF.
abstract: Healthy stem cell donors start leukapheresis 4-5 days after starting G-CSF based on the peripheral blood CD34+ cell count (PBCD34). Data from 137 harvests (68 donors) were analyzed to determine correlation between pre-apheresis leukocytes (11.0-94.8x10(9)/l; median 38.8) and platelets (49-374x10(9)/l; median 180), and PBCD34 (3-276/microl; median 40). PBCD34 correlated positively with leukocytes (r=0.48; P<0.0001) and platelets (r=0.40; P<0.0001). When pre-apheresis leukocytes were >or=25 and platelets were >or=100, PBCD34 and CD34+ collection were 5-276/microl (median 57) and 0.5-27.6x10(6)/kg (median 4.7), respectively; significantly higher than PBCD34 of 3-74/microl (median 17) and CD34+ collection of 0.2-8.9 x 10(6)/kg (median 2.2) when leukocytes were <25 and/or platelets were <100. With leukocytes >or=25 and platelets >or=100, PBCD34 was low (<20/microl) 8% of the time, compared to 57% of the time with leukocytes <25 and/or platelets <100 (P<0.0001). Our data suggest that it is not always necessary to measure PBCD34 to guide leukapheresis in healthy donors because pre-apheresis leukocytes and platelets >or=25 and >or=100, respectively, are associated with excellent mobilization. When blood counts do not meet these criteria, PBCD34 should be determined prior to initiation of apheresis.
authors.affiliation: The Hematopoietic Stem Cell Transplant Program, Division of Hematology/Oncology, Feinberg School of Medicine, Northwestern University, Chicago, IL 60611, USA.
authors.forename: M
authors.initials: M
authors.lastname: Tomblyn
authors.forename: L I
authors.initials: LI
authors.lastname: Gordon
authors.forename: S
authors.initials: S
authors.lastname: Singhal
authors.forename: M S
authors.initials: MS
authors.lastname: Tallman
authors.forename: S
authors.initials: S
authors.lastname: Williams
authors.forename: J N
authors.initials: JN
authors.lastname: Winter
authors.forename: A
authors.initials: A
authors.lastname: Evens
authors.forename: J
authors.initials: J
authors.lastname: Mehta
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D001781:Blood Component Removal; D005260:Female; D016179:Granulocyte Colony-Stimulating Factor / Q000627:therapeutic use*; D019650:Hematopoietic Stem Cell Mobilization / Q000379:methods; D006801:Humans; D007958:Leukocyte Count; D008297:Male; D008875:Middle Aged; D010976:Platelet Count; D014019:Tissue Donors; D020858:Tissue and Organ Harvesting; D014184:Transplantation, Homologous
chemical_list: D016179:Granulocyte Colony-Stimulating Factor