Hla-DPB1 mismatch in HLA-A-B-DRB1 identical sibling donor stem cell transplantation and acute graft-versus-host disease.

Transplantation 2004 Apr;77(7):1107-10

Alloreactivity Unit of the Institut Català d'Oncologia, Barcelona, Spain.

Background: The role of human leukocyte antigen (HLA)-DPB1 as a transplantation antigen is controversial. A higher incidence of acute graft-versus-host disease (aGVHD) has been described after unrelated donor bone marrow transplant when both HLA-DPB1 alleles were mismatched.

Methods: We investigated the impact of a single HLA-DPB1 mismatch after HLA-A-B-DRB1 identical sibling donor transplantation on aGVHD. We analyzed 627 adult patient-donor pairs and identified 30 pairs without HLA-DPB1 identity (4.78%). In 17 cases, the patient had an allele that was not shared by the donor.

Results: The cumulative incidence of grades II-IV aGVHD was higher in the HLA-DPB1 mismatched group (66.7% vs. 35.7%, p=0.012). The HLA-DPB1 mismatch was identified by multivariate analysis as an independent risk factor for aGVHD (p=0.020, RR=2.68, 95% CI: 1.73-3.62).

Conclusions: HLA-DPB1 can mediate alloreactive responses. A single HLA-DPB1 mismatch increases the risk of aGVHD after sibling donor stem cell transplantation.

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Source
http://dx.doi.org/10.1097/01.tp.0000122225.10296.10DOI Listing
April 2004
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