Previous retrospective studies have demonstrated improved outcome in patients whose donors were marched for non-HLA markers in the MHC as well as for HLA genes. Forty patients receiving transplants from unrelated donors were typed prospectively for HLA and non-HLA markers. Non-HLA markers near HLA-B (beta-block markers) and in the DRB1 introns (delta-block markers) were used to assess MHC match between donors and recipient. Patients whose donors were matched at the beta- and delta-blocks had improved event free survival(63%) compared to patients whose donors were mismatched at one or both blocks (25%) (P <0.05). Patients whose donors were marched at the beta-block had significantly less severe acute graft versus host disease (p <0.05). In order to investigate the basis for improved outcome block matching was correlated with HLA matching as determined by DNA sequencing. Beta-block matching was highly correlated with matching for exons 2 and 3 of HLA-B but less so for HLA-C. Delta-block matching was highly correlated with matching for exon 2 of HLA DRB1. It is concluded that matching for non-HLA markers in the MHC improves matching for HLA genes. Further studies are required to determine whether matching for non-HLA markers improves outcome to a greater extent than matching for the HLA genes alone. Human Immunology 61, 83-91 (2000). (C) American Society for Histocompatibility and Immunogenetics, 2000. Published by Elsevier Science Inc.
Witt, C., Sayer, D., Trimboli, F., Saw, M., Herrmann, R., Cannell, P., ... Christiansen, F. (2000). Unrelated Donors Selected Prospectively by Block-matching Have Superior Bone Marrow Transplant Outcome. Human Immunology, 61(2), 85-91. https://doi.org/10.1016/S0198-8859(99)00147-0