Role of allogeneic stem cell transplantation in adult patients with Ph-negative acute lymphoblastic leukemia
Nathalie Dhédin, Anne Huynh, Sébastien Maury, Reza Tabrizi, Kheira Beldjord, Vahid Asnafi, Xavier Thomas, Patrice Chevallier, Stéphanie Nguyen, Valérie Coiteux, Jean-Henri Bourhis, Yosr Hichri, Martine Escoffre-Barbe, Oumedaly Reman, Carlos Graux, Yves Chalandon, Didier Blaise, Urs Schanz, Véronique Lhéritier, Jean-Yves Cahn, Hervé Dombret, Norbert Ifrah, GRAALL group
Abstract
Because a pediatric-inspired Group for Research on Adult Acute Lymphoblastic Leukemia (GRAALL) protocol yielded a markedly improved outcome in adults with Philadelphia chromosome-negative ALL, we aimed to reassess the role of allogeneic stem cell transplantation (SCT) in patients treated in the GRAALL-2003 and GRAALL-2005 trials. In all, 522 patients age 15 to 55 years old and presenting with at least 1 conventional high-risk factor were candidates for SCT in first complete remission. Among these, 282 (54%) received a transplant in first complete remission. At 3 years, posttransplant cumulative incidences of relapse, nonrelapse mortality, and relapse-free survival (RFS) were estimated at 19.5%, 15.5%, and 64.7%, respectively. Time-dependent analysis did not reveal a significant difference in RFS between SCT and no-SCT cohorts. However, SCT was associated with longer RFS in patients with postinduction minimal residual disease (MRD) ≥10(-3) (hazard ratio, 0.40) but not in good MRD responders. In B-cell precursor ALL, SCT also benefitted patients with focal IKZF1 gene deletion (hazard ratio, 0.42). This article shows that poor early MRD response, in contrast to conventional ALL risk factors, is an excellent tool to identify patients who may benefit from allogeneic SCT in the context of intensified adult ALL therapy. Trial GRAALL-2003 was registered at www.clinicaltrials.gov as #NCT00222027; GRAALL-2005 was registered as #NCT00327678.
© 2015 by The American Society of Hematology.
Source: PubMed