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We searched for immunogenic mismatches of H-Y minor histocompatibility antigens among unrelated HLA-matched donor-recipient pairs and for their association with transplant outcomes. We included 92 patients who were treated with 10/10 HLA allele–matched, unrelated allogeneic hematopoietic stem cell transplantation (alloHSCT). H-Y genotyping was performed in the Regional Blood Center with use of the Dynal Minor Histocompatibility Antigen Typing Kit. H-Y mismatches in the graft-versus-host direction of female donor to male recipient decreased the relapse rate (6% vs 23%; P = .046) and tended to improve disease-free survival (79% vs 44%; P = .067), but it also increased the incidence of chronic graft-versus-host disease (66% vs 38%; P = .02). Thus it influenced the results of alloHSCT from HLA-matched unrelated donors. The results of this study may help to explain the impact of gender differences between donor and recipient in alloHSCT.

Aim Biology of antibody production and function of immunologically competent cells is closely related to transplant process.This kind of research gives a possibility to observe and estimate patient and donor matching. The most interesting is to appoint some common denominator of HLA mismatches and antibody specificity detected in a serum of mismatched patient. We collected sera from patients both pre and post allo-HSCT transplantation. All the donor/recipient pair mismatches were known. Methods We tested 130 sera collected from patients there were three periods:before transplantation, 6 month and 12 months after transplantation. DynaChip and LabScreen Luminex methods were used to identify anti-HLA antibody against HLA-A,B,C,DR,DQ and DP. We were able to define specificity of antibodies on the low and high resolution level. Software DynaChip and Fusion were used to perform immunogenetic analyses of our research. Results In a group of patients 57% people expressed anti-HLA antibodies. We identified anti-HLA antibodies against HLA class I and HLA class II. We were able to define specificity of antibodies on low and high resolution level. In a group of 43% of patients we did not identify anti-HLA antibodies. We devided a patient into two groups mismatched in HLA class I antigen and mismatched in HLA class II antigen. We analysed people produced antibody against one or many antigens. As a second step of our research we analyse donor recipient mismatches on the level of allele. Donor recipient mismatches were connected with HLA allele locus C (6,6%), HLA allele locus B (13,3%), HLA allele locus A (3,3%), HLA allele locus DQB1 ∗ (10%). When we look at the PRA positive patient 20% of them express presence of antibodies against many specificities, 16,7% against no more than 3 specificity, 20% against single antigen. Conclusions As a continuation of our research we are going to use the Immport Database. We would like to try compare specificity of anti-HLA antibodies and molecular structure of mismatched alleles. Siekiera: Blood Center: Other: HLA Lab Director. Dobrowolska: Blood Center: Employee. Markiewicz: Medical University of Silesia: Other: Clinician.