Fludarabine, antithymocyte globulin, and very low-dose busulfan for reduced-intensity conditioning before allogeneic stem cell transplantation in patients with lymphoid malignancies

Florent Malard, Xavier Cahu, Aline Clavert, Eolia Brissot, Patrice Chevallier, Thierry Guillaume, Jacques Delaunay, Sameh Ayari, Viviane Dubruille, Beatrice Mahe, Thomas Gastinne, Nicolas Blin, Jean-Luc Harousseau, Philippe Moreau, Noel Miplied, Steven Le Gouill, Mohamad Mohty
Biology of Blood and Marrow Transplantation 2011, 17 (11): 1698-703
This retrospective report compared the results of a reduced-intensity conditioning (RIC) regimen including fludarabine (Flu), and very low-dose oral busulfan (BU) (4 mg/kg total dose) in combination with antithymocyte globulin (ATG) (Flu/ATG/BU) to the classical Flu and low-dose total body irradiation (TBI) (2 Gy) regimen (Flu/TBI) in patients with lymphoid malignancies. With a median follow-up of 42 months, the cumulative incidence of transplant-related mortality (TRM) was 22% in the Flu/ATG/BU group versus 41% in the Flu/TBI group (P = .09). Grade 3-4 acute graft-versus-host disease (aGVHD) and extensive chronic GVHD (cGVHD) incidents were 15% versus 44% (P = .006), and 12% versus 58% (P = .0003), in the Flu/ATG/BU group versus the Flu/TBI group, respectively. The Kaplan-Meier estimate of overall survival (OS) at 2 years was comparable between both groups (71%; 95% confidence interval [CI] 58%-86%, in the Flu/ATG/BU group vs 60%; 95% CI 44%-83%, in the Flu/TBI group, P = .20). The estimate of progression-free survival (PFS) was 63% (95% CI 50%-80%) in the Flu/ATG/BU group versus 52% (95% CI, 36%-76%) in the Flu/TBI group (P = .18), suggesting that reduced-intensity conditioning (RIC) based on Flu, very low-dose BU, and ATG has the potential to induce long-term remissions in patients with lymphoid malignancies.

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