• K Fleischhauer, M A Fernandez-Viña, T Wang, M Haagenson, M Battiwalla, L A Baxter-Lowe, F Ciceri, J Dehn, J Gajewski, G A Hale, HeemskerkM B AMBDutch Transplant Foundation, Leiden, The Netherlands., S R Marino, P L McCarthy, D Miklos, M Oudshoorn, M S Pollack, V Reddy, D Senitzer, B E Shaw, E K Waller, S J Lee, and S R Spellman.
• 1] Institute of Experimental Cellular Therapy, Essen University Hospital, Essen, Germany [2] Unit of Molecular and Functional Immunogenetics, San Raffaele Scientific Institute, Milan, Italy.
• Bone Marrow Transplant. 2014 Sep 1; 49 (9): 1176-83.

AbstractHLA-DP antigens are beta-alpha heterodimers encoded by polymorphic HLA-DPB1 and -DPA1 alleles, respectively, in strong linkage disequilibrium (LD) with each other. Non-permissive unrelated donor (UD)-recipient HLA-DPB1 mismatches across three different T-cell epitope (TCE) groups are associated with increased mortality after hematopoietic SCT (HCT), but the role of HLA-DPA1 is unclear. We studied 1281 onco-hematologic patients after 10/10 HLA-matched UD-HCT facilitated by the National Marrow Donor Program. Non-permissive mismatches defined solely by HLA-DPB1 TCE groups were associated with significantly higher risks of TRM compared to permissive mismatches (hazard ratio (HR) 1.30, confidence interval (CI) 1.06-1.53; P=0.009) or allele matches. Moreover, non-permissive HLA-DPB1 TCE group mismatches in the graft versus host (GvH) direction significantly decreased the risk of relapse compared to permissive mismatches (HR 0.55, CI 0.37-0.80; P=0.002) or allele matches. Splitting each group into HLA-DPA1*02:01 positive or negative, in frequent LD with HLA-DPB1 alleles from two of the three TCE groups, or into HLA-DPA1 matched or mismatched, did not significantly alter the observed risk associations. Our findings suggest that the effects of clinically non-permissive HLA-DPB1 TCE group mismatches are independent of HLA-DPA1, and that selection of donors with non-permissive DPB1 TCE mismatches in GvH direction might provide some protection from disease recurrence.

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