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Prepublished online as a Blood First Edition Paper on April 10, 2003; DOI 10.1182/blood-2002-09-2866.

Submitted September 19, 2002
Accepted March 21, 2003
Hematopoietic stem cell transplantation: contrasting the outcome of transplantations from HLA-identical siblings, partially HLA-mismatched related and HLA-matched unrelated donors
Hellmut D Ottinger, Stanislav Ferencik, Dietrich W Beelen, Monika Lindemann, Rudolf Peceny, Ahmet H Elmaagacli, Johannes Huesing, and Hans Grosse-Wilde*
Institute for Immunology, University Hospital of Essen, Essen, Germany
Department of Bone Marrow Transplantation, University Hospital of Essen, Essen, Germany
Institute for Medical Informatics, Biometry and Epidemiology, University Hospital of Essen, Essen, Germany
* Corresponding author; email: immunologie{at}uni-essen.de.
Allogeneic hematopoietic stem cell transplantation (HSCT) is a proven curative therapy for many hematological malignancies. HSCT from HLA-identical sibling donors (ISD) is still the golden standard. For the remaining 70% of the patients lacking an ISD alternative (partially) HLA-matched family donors (MFD) and HLA-matched unrelated donors (MUD) are now widely accepted. However, it is presently unclear whether outcome after HSCT from MFD or MUD is superior. Thus, the classical clinical endpoints after HSCT from ISD (n=138), MFD (n=86), and MUD (n=101) were compared by means of uni- and multivariate statistical analyses. MFD transplants with HLA class II (DRB1±DQB1) mismatches in graft-versus-host (GvH) direction showed an increased risk of grades II-IV graft-versus-host disease, and MFD transplants with more than a single HLA class I (A±B±C) mismatch in host-versus-graft (HvG) direction were associated with a higher risk of graft failure. However, no significant difference in overall survival was detectable between the three study groups after adjustment for the main predictors of transplant outcome. Thus, for patients lacking an ISD, an already identified MFD with an HLA-DRB1±DQB1 mismatch in GvH- or a combined HLA-A±B±C mismatch in HvG-direction should only be accepted in clinical urgent settings leaving no time to identify a MUD.

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