To compare the efficacy of HLA6/6-matched haploidentical hematopoietic stem cell transplant (haplo-HSCT) with that of HLA3/6-matched HSCT in T-cell-replete transplants, we recruited 27 consecutive recipients from multiple centers who received HLA6/6-matched haplo-HSCT from a parent or child donor between February 2010 and May 2016. A matched-pair analysis was designed. For each recipient from the study cohort, two recipients were randomly selected from the control cohort and matched (according to patient age, patient sex, disease type, disease status, donor age, donor sex, and recipient-donor relationship). No significant differences were found in hematopoietic recovery. The incidence of grade II-IV and III-IV acute graft versus host disease was similar (18.5% vs. 31.5%, P=0.216; 11.1% vs. 9.3%, P=0.792) in the HLA6/6 and HLA3/6 groups, respectively. The 3-year cumulative incidence of relapse was 14.8% and 17.0% (P=0.800). The 3-year cumulative incidence of nonrelapse mortality was 12.1% and 17.6% (P=0.751). The estimated 3-year disease-free survival was 73.1% and 65.5% (P=0.489). The estimated 3-year overall survival was 74.7% and 74.0% (P=0.946). The data suggested the efficacy and safety of the HLA6/6- and the HLA3/6-matched haplo-HSCT between parents and children are comparable. That HLA-mismatch disparity is not correlated with T-cell-replete haplo-HSCT outcome was substantiated.
Keywords: donor; hematopoietic stem cell transplantation; human leukocyte antigen.