COMPARATIVE STUDY
JOURNAL ARTICLE
MULTICENTER STUDY

Reduced-intensity versus conventional myeloablative conditioning allogeneic stem cell transplantation for patients with acute lymphoblastic leukemia: a retrospective study from the European Group for Blood and Marrow Transplantation

Mohamad Mohty, Myriam Labopin, Liisa Volin, Alois Gratwohl, Gérard Socié, Jordi Esteve, Reza Tabrizi, Arnon Nagler, Vanderson Rocha
Blood 2010 November 25, 116 (22): 4439-43
20716774
This retrospective study assessed the outcome of 576 adult acute lymphoblastic leukemia patients aged ≥ 45 years, and who received a reduced-intensity conditioning (RIC; n = 127) or myeloablative conditioning (MAC; n = 449) allogeneic stem cell transplantation (allo-SCT) from a human leukocyte antigen-identical sibling while in complete remission. With a median follow-up of 16 months, at 2 years, the cumulative incidences of nonrelapse mortality and relapse incidence were 29% ± 2% (MAC) versus 21% ± 5% (RIC; P = .03), and 31% ± 2% (MAC) versus 47% ± 5% (RIC; P < .001), respectively. In a multivariate analysis, nonrelapse mortality was decreased in RIC recipients (P = .0001, hazard ratio [HR] = 1.98) whereas it was associated with higher relapse rate (P = .03, HR = 0.59). At 2 years, LFS was 38% ± 3% (MAC) versus 32% ± 6% (RIC; P = .07). In multivariate analysis, the type of conditioning regimen (RIC vs. MAC) was not significantly associated with leukemia-free survival (P = .23, HR = 0.84). Despite the need for randomized trials, we conclude that RIC allo-SCT from a human leukocyte antigen-identical donor is a potential therapeutic option for acute lymphoblastic leukemia patients aged ≥ 45 years in complete remission and not eligible for MAC allo-SCT.

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