title: Effect of HLA class II gene disparity on clinical outcome in unrelated donor hematopoietic cell transplantation for chronic myeloid leukemia: the US National Marrow Donor Program Experience.
abstract: The clinical importance of HLA class II gene disparity in unrelated stem cell transplantation is not entirely known. The impact was evaluated of matching donors and recipients for HLA-DR, HLA-DQ, and HLA-DP genes on clinical outcome after stem cell transplantation for chronic myeloid leukemia (CML) performed between 1988 and 1997. HLA-DRB1, -DQA1, -DQB1, -DPA1, and -DPB1 alleles were identified in 831 transplant pairs using a combination of sequence-specific oligonucleotide probes, sequence-specific priming, and sequencing methods. Among the 831 pairs, 696 (84%) were HLA-A and -B serologically matched; of these, 565 (81%) were also matched for HLA-DRB1. HLA-DRB1 matching correlated with significantly improved survival (relative risk [RR], 1.29 [95% confidence interval (CI), 1.02-1.64; P =.04]) independently of HLA-DQA1 or HLA-DQB1 (RR, 1.01 [95% CI, 0.81-1.26; P =.94]) and HLA-DPA1 or HLA-DPB1 (RR, 1.11 [95% CI, 0.84-1.48; P =.46]). Single-locus HLA-DQ or HLA-DP disparity was not associated with significantly poorer survival. For patients who underwent transplantation in the first chronic phase (CP) from HLA-A, B matched donors, the presence of DRB1 allele mismatching was independently associated with increased incidence of grades III-IV acute graft-versus-host disease (GVHD). No significant associations of class II allele mismatching with risk for delayed engraftment or chronic GVHD disease were detected. This study clearly demonstrates the importance of precise matching of HLA-DRB1 alleles for successful transplantation. Furthermore, a good-risk population of patients whose transplantations were performed in the first CP of disease from HLA-A, B, DRB1 matched unrelated donors can be shown to have superior survival.
authors.affiliation: Fred Hutchinson Cancer Research Center, the U.S. National Marrow Donor Program, Georgetown University, Memorial Sloan Kettering Cancer Center, USA.
authors.forename: E W
authors.initials: EW
authors.lastname: Petersdorf
authors.forename: C
authors.initials: C
authors.lastname: Kollman
authors.forename: C K
authors.initials: CK
authors.lastname: Hurley
authors.forename: B
authors.initials: B
authors.lastname: Dupont
authors.forename: A
authors.initials: A
authors.lastname: Nademanee
authors.forename: A B
authors.initials: AB
authors.lastname: Begovich
authors.forename: D
authors.initials: D
authors.lastname: Weisdorf
authors.forename: P
authors.initials: P
authors.lastname: McGlave
mesh_terms: D000483:Alleles; D018572:Disease-Free Survival; D005260:Female; D005802:Genes, MHC Class II; D006085:Graft Survival; D006086:Graft vs Host Disease / Q000453:epidemiology / Q000209:etiology / Q000517:prevention & control; D006681:HLA-D Antigens / Q000235:genetics / Q000276:immunology*; D006682:HLA-DP Antigens / Q000235:genetics / Q000276:immunology; D006683:HLA-DQ Antigens / Q000235:genetics / Q000276:immunology; D006684:HLA-DR Antigens / Q000235:genetics / Q000276:immunology; D059811:HLA-DRB1 Chains; D018380:Hematopoietic Stem Cell Transplantation / Q000009:adverse effects / Q000706:statistics & numerical data; D006648:Histocompatibility; D006801:Humans; D015464:Leukemia, Myelogenous, Chronic, BCR-ABL Positive / Q000401:mortality / Q000628:therapy*; D015993:Life Tables; D008297:Male; D016016:Proportional Hazards Models; D012042:Registries / Q000706:statistics & numerical data; D012189:Retrospective Studies; D016019:Survival Analysis; D014019:Tissue Donors; D009927:Tissue and Organ Procurement; D019172:Transplantation Conditioning; D016896:Treatment Outcome; D014481:United States / Q000453:epidemiology
chemical_list: D006681:HLA-D Antigens; D006682:HLA-DP Antigens; D006683:HLA-DQ Antigens; D006684:HLA-DR Antigens; D059811:HLA-DRB1 Chains