title: ABO incompatible stem cell transplantation in children does not influence outcome.
abstract: BACKGROUND
  Although delayed red cell engraftment and/or hemolysis have been thoroughly documented in association with ABO incompatibility between donor and recipient in patients undergoing hematopoietic stem cell transplantation (HSCT), there are no studies defining the general, long term clinical outcome in a large group of pediatric patients.
  
  
  METHODS
  We undertook a retrospective single center analysis of children undergoing pediatric allogeneic stem cell transplantation to determine the influence of ABO donor/recipient incompatibility. Outcome was analyzed according to donor type and included survival, graft versus host disease (GvHD), relapse, days of infection, antibiotic use, transfusion requirement and duration of hospital stay.
  
  
  RESULTS
  Two hundred and sixteen children (136 males; 80 females, aged 0-19) transplanted between January 1992 and December 2003 were included in the study. Indications for transplantation were hematological malignancies (n=179) and aplastic conditions (n=37). ABO compatibility was documented in 121 donor/recipient pairs. ABO incompatibility was documented in 95 donor/recipient pairs with 40 major, 40 minor and 15 bi-directional incompatible pairs. ABO incompatibility did not influence survival rate (P=0.3762), the incidence of GvHD (P=0.253) or rate of relapse (P=0.930). Recovery of leucocytes was influenced by ABO incompatibility (P=0.0493), but the rate of infection, transfusion requirements and duration of hospital stay are not.
  
  
  CONCLUSIONS
  In the pediatric setting, ABO major and/or minor mismatch between donor and recipient did not significantly influence the outcome of HSCT. The choice of donor should be determined by the degree of HLA match and CMV status in preference to ABO blood group compatibility.
authors.affiliation: Department of Pediatrics, Leiden University Medical Center, Leiden, The Netherlands.
authors.forename: A M
authors.initials: AM
authors.lastname: Helming
authors.forename: A
authors.initials: A
authors.lastname: Brand
authors.forename: R
authors.initials: R
authors.lastname: Wolterbeek
authors.forename: M J D
authors.initials: MJ
authors.lastname: van Tol
authors.forename: R M
authors.initials: RM
authors.lastname: Egeler
authors.forename: L M
authors.initials: LM
authors.lastname: Ball
mesh_terms: D000017:ABO Blood-Group System; D000293:Adolescent; D001787:Blood Group Incompatibility; D002648:Child; D002675:Child, Preschool; D005260:Female; D018380:Hematopoietic Stem Cell Transplantation; D006801:Humans; D007223:Infant; D008297:Male; D015999:Multivariate Analysis; D016016:Proportional Hazards Models; D012189:Retrospective Studies; D016019:Survival Analysis; D014184:Transplantation, Homologous; D016896:Treatment Outcome
chemical_list: D000017:ABO Blood-Group System