title: Delayed platelet engraftment in group O patients after autologous progenitor cell transplantation.
abstract: BACKGROUND
  Fucosylated glycans, including H-antigen, play critical roles in hematopoietic progenitor cell homing, adhesion, growth, and differentiation. H-active antigens are strongly expressed on CD34+ progenitor cells and committed megakaryocytic progenitors and may mediate adhesion to marrow stromal fibroblasts. We examined the possible influence of donor ABO type on platelet (PLT) engraftment after autologous peripheral blood progenitor cell transplant (PBPCT).
  
  
  METHODS
  A retrospective analysis of all patients who underwent a single autologous PBPCT between 1996 and 2000 were reviewed. Neutrophil and PLT engraftment were compared by patient ABO type and CD34+ cell dose by t test, chi-square test, analysis of variance, Kaplan-Meier probability, and log-rank test.
  
  
  RESULTS
  Engraftment data was available in 195 patients. PLT engraftment was delayed in all patients, regardless of ABO type, at CD34+ PBPC doses of 2x10(6) to 3x10(6) per kg (p<0.001). When examined by ABO type, late PLT engraftment (PLT count>50x10(9)/L) was significantly delayed in group O patients relative to all non-group O patients (32.4 days vs. 19.6 days, p<0.001). Approximately 50 percent of group O patients required more than 40 days to achieve late PLT recovery (p<0.005).
  
  
  CONCLUSIONS
  A group O phenotype may be associated with delayed PLT engraftment at lower CD34 doses.
authors.affiliation: Department of Pathology, University of Michigan, Ann Arbor, Michigan 48109, USA.
authors.forename: Sandra
authors.initials: S
authors.lastname: Hoffmann
authors.forename: Lan
authors.initials: L
authors.lastname: Zhou
authors.forename: Yuan
authors.initials: Y
authors.lastname: Gu
authors.forename: Robertson
authors.initials: R
authors.lastname: Davenport
authors.forename: Laura
authors.initials: L
authors.lastname: Cooling
mesh_terms: D000017:ABO Blood-Group System; D000328:Adult; D018952:Antigens, CD34 / Q000032:analysis; D001792:Blood Platelets / Q000166:cytology* / Q000276:immunology; D005260:Female; D018380:Hematopoietic Stem Cell Transplantation; D006801:Humans; D007700:Kinetics; D008297:Male; D008875:Middle Aged; D009504:Neutrophils / Q000166:cytology; D010976:Platelet Count; D012189:Retrospective Studies; D014182:Transplantation, Autologous; D016896:Treatment Outcome
chemical_list: D000017:ABO Blood-Group System; D018952:Antigens, CD34