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  • Title: Impact of Adding Antithymocyte Globulin to Posttransplantation Cyclophosphamide in Haploidentical Stem-Cell Transplantation.
    Author: El-Cheikh J, Devillier R, Dulery R, Massoud R, Al Chami F, Ghaoui N, Moukalled N, Pagliardini T, Marino F, Malard F, Bazarbachi AH, Mohty R, Bazarbachi A, Castagna L, Mohty M, Blaise D.
    Journal: Clin Lymphoma Myeloma Leuk; 2020 Sep; 20(9):617-623. PubMed ID: 32457025.
    Abstract:
    BACKGROUND: Graft-versus-host disease (GVHD) is a major cause of mortality after allogeneic stem-cell transplantation. Posttransplantation cyclophosphamide (PT/CY) has become standard prophylaxis of GVHD in T-replete haploidentical transplantation. The question is whether adding antithymocyte globulin (ATG) to PT/CY may further reduce the incidence of GVHD compared to PT/CY only. PATIENTS AND METHODS: We retrospectively studied 268 patients undergoing myeloablative haploidentical transplantation with thiotepa, busulfan, and fludarabine (TBF) conditioning. Sixty-nine patients (26%) received ATG. RESULTS: In the ATG group, 3% died due to GVHD versus 8% in the no ATG group. The 100-day and 1-year nonrelapse mortality (NRM) was 0% and 19%, respectively, in the whole cohort. On univariate analysis, the 1-year NRM was 8% versus 23% in patients receiving ATG and no ATG, respectively (P = .005). The no ATG group had a higher incidence of acute GVHD at 12 months compared to the ATG group (22% vs. 12%, respectively, P = .029). The ATG group had better overall survival at 12 months compared to the no ATG group (79% vs. 69%, P = .029). On multivariate analysis, adding ATG to PT/CY had no significant impact on any of the outcomes. A low disease risk index was associated with better overall survival and lower NRM, while Hematopoietic Cell Transplantation-Specific Comorbidity Index (HCT-CI) score ≥ 3 was associated with higher NRM. CONCLUSION: ATG can be safely used as part of the pretransplantation conditioning and does not increase the incidence of relapse or complications after transplantation.
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