Reduced-intensity transplantation for lymphomas using haploidentical related donors vs HLA-matched unrelated donors

Abstract

We evaluated 917 adult lymphoma patients who received haploidentical (n 5 185) or HLAmatched unrelated donor (URD) transplantation either with (n 5 241) or without antithymocyte globulin (ATG; n 5 491) following reduced-intensity conditioning regimens. Haploidentical recipients received posttransplant cyclophosphamide-based graft-versushost disease (GVHD) prophylaxis, whereas URD recipients received calcineurin inhibitorbased prophylaxis. Median follow-up of survivors was 3 years. The 100-day cumulative incidence of grade III-IV acute GVHD on univariate analysis was 8%, 12%, and 17% in the haploidentical, URD without ATG, and URD with ATG groups, respectively (P 5 .44). Corresponding 1-year rates of chronic GVHD on univariate analysis were 13%, 51%, and 33%, respectively (P < .001).Onmultivariate analysis, grade III-IV acuteGVHDwas higher in URD without ATG (P 5 .001), as well as URD with ATG (P 5 .01), relative to haploidentical transplants. Similarly, relative to haploidentical transplants, risk of chronic GVHD was higher in URDwithout ATGandURD withATG(P