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  • Title: The impact of partial T cell depletion on overall transplant-related toxicity, graft function and survival after HLA-identical allogeneic bone marrow transplantation in standard risk adult patients with leukemia.
    Author: Schots R, Van Riet I, Ben Othman T, Trullemans F, De Waele M, Van Camp B.
    Journal: Bone Marrow Transplant; 2001 Nov; 28(10):917-22. PubMed ID: 11753544.
    Abstract:
    In this single-center study, a consecutive cohort of 59 adult patients transplanted with HLA-identical bone marrow and receiving graft-versus-host disease (GVHD) prophylaxis with either standard cyclosporine/methotrexate (n = 33) or partial T cell depletion (E-rosetting) (TCD, n = 26 were analyzed). Only patients with chronic myeloid leukemia in first chronic phase or acute leukemia/myelodysplasia in first or second remission were included. Except for age (median 28 vs 42 years), both groups were comparable in terms of diagnosis, conditioning regimen and growth factor support. TCD significantly reduced >grade II acute GVHD (0 vs 24%, P = 0.02), chronic GVHD (8.5 vs 45%, P = 0.007) and other major bone marrow transplant (BMT)-related complications (4 vs 36%, P = 0.005). TCD decreased overall transplant-related mortality (11.5 vs 36%, P = 0.04). In the TCD group faster neutrophil (13 vs 22 days, P = 0.02) and platelet recoveries (18 vs 26 days, P < 0.001) were noted. The relapse risk was higher after TCD (57.5 vs 21.5%, P = 0.04). Overall survival probability at 10 years was identical in both groups (54 vs 53.5%, P = 0.33). We found a relationship between the number of T cells in the graft and the occurrence of major complications (P < 0.001) and relapse (P = 0.03). This comparative analysis shows that graft-derived T cells have a major role in overall BMT-related toxicity and that partial TCD is an acceptable approach in terms of survival for patients between 40 and 50 years of age.
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