Effect of matching of class I HLA alleles on clinical outcome after transplantation of hematopoietic stem cells from an unrelated donor. Japan Marrow Donor Program.
BACKGROUND
The requirements with respect to HLA compatibility and the relative importance of matching for individual class I and class II HLA alleles in the transplantation of hematopoietic stem cells from unrelated donors have not yet been established.


METHODS
We performed retrospective DNA typing of alleles at 11 polymorphic loci of HLA genes in 440 recipients of hematopoietic stem cells from unrelated donors who were serologically identical with their respective recipients for HLA-A, B, and DR antigens. Of these recipients, 80 percent had leukemia; the rest had lymphoma, marrow failure, or a congenital disorder.


RESULTS
Multivariate analysis showed that incompatibility for HLA-A alleles and incompatibility for HLA-C alleles were independent risk factors for severe acute graft-versus-host disease (GVHD) (HLA-A, P=0.006; HLA-C, P=0.001). Mismatching of HLA-A, but not of HLA-C, alleles was an independent risk factor for death (P<0.001). Matching [corrected] of HLA-C alleles was a significant risk factor for relapse of leukemia (P=0.035). HLA-B disparity was a significant risk factor for both GVHD and death in the univariate analysis, but not in multivariate analysis. Disparities in class II HLA alleles of the DRB1, DQA1, DQB1, DPA1, and DPB1 loci were not identified as significant risk factors for acute GVHD or death in the multivariate analysis.


CONCLUSIONS
Genomic typing of class I HLA alleles adds substantially to the success of transplantation of hematopoietic stem cells from unrelated donors, even if the donors are serologically identical to their recipients with respect to HLA-A, B, and DR antigens.
Department of Genetics, Medical Institute of Bioregulation, Kyushu University, Fukuoka, Japan.
T
T
Sasazuki
T
T
Juji
Y
Y
Morishima
N
N
Kinukawa
H
H
Kashiwabara
H
H
Inoko
T
T
Yoshida
A
A
Kimura
T
T
Akaza
N
N
Kamikawaji
Y
Y
Kodera
F
F
Takaku
D000293:Adolescent; D000328:Adult; D000483:Alleles; D002648:Child; D002675:Child, Preschool; D005260:Female; D005805:Genes, MHC Class I / Q000235:genetics*; D006086:Graft vs Host Disease / Q000235:genetics; D018380:Hematopoietic Stem Cell Transplantation; D015395:Histocompatibility Antigens Class I / Q000235:genetics*; D006650:Histocompatibility Testing; D006801:Humans; D007223:Infant; D007938:Leukemia / Q000401:mortality / Q000628:therapy*; D008297:Male; D008875:Middle Aged; D012008:Recurrence; D012189:Retrospective Studies; D016019:Survival Analysis; D014019:Tissue Donors; D016896:Treatment Outcome
D015395:Histocompatibility Antigens Class I