Prevention of relapse using DLI can increase survival following HLA-identical transplantation in patients with advanced-stage acute leukemia: a multi-center study.

A total of 123 consecutive patients with advanced-stage, acute leukemia undergoing HSCT from HLA-identical sibling donors were analyzed. A G-CSF-primed DLI was planned within day 60 post-transplantation before hematologic relapse was diagnosed. Fifty of the 123 individuals received prophylactic DLI, and 73 individuals received no prophylactic treatment. The incidence of grades II-IV acute graft-versus-host disease (GVHD) was 17% for patients receiving DLI and 23% for patients not receiving DLI (p = 0.35). The incidence of chronic GVHD was 38% for patients receiving DLI and 17% for patients not receiving DLI (p = 0.021). The two-yr cumulative incidence of relapse was significantly lower in patients who received prophylactic DLI (46%) compared with patients who did not receive prophylactic DLI (66%) (p = 0.02). The three-yr probability of overall survival was higher in patients who received prophylactic DLI (36%) than in patients who did not receive prophylactic DLI (11%) (p = 0.001). The leukemia-free survival was also higher in patients who received prophylactic DLI (29%) than in patients who did not receive prophylactic DLI (9%) (p = 0.001). Our comparisons suggest that the prophylactic use of DLI can significantly increase survival of patients with advanced-stage, acute leukemia who receive HLA-identical sibling HSCT.