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- W2559303890 abstract "Abstract Abstract 4532 Introduction: In an unicenter analysis we investigated the impact of allogeneic hematopoietic cell transplantation (RIC-HCT) after reduced intensity conditioning on the kinetics of engraftment and predictor of outcome in 50 patients with advanced CLL. Patient and Methods: Patients in advanced stage CLL (n=50) received Fludarabine 30mg/m2 on day -4 to -2 and 2Gy TBI on day 0 followed by cyclosporine and MMF from unrelated (n=40) or related (n=10) donors between June 1999 and March 2010 at the University of Leipzig. The majority of patients (n= 35) were male, had Binet C (n=37, 74%) at RIC-HCT. The median age was 58 (range 44–69) years. Of 48 patients for whom cytogenetic analyses were available, 22 (46%) had unfavourable cytogenetics including del 17 or del 11q. Three (6%) patients had CR, 27 (54%) PR, 7 (14%) progressive disease, 12 (24%) stable disease and one (5%) relapse at RIC-HCT. Resistance to first line therapy was present in 25 (50%) patients, whereas 12 (24%) were resistant to Fludarabine. Richter’s transformation was found in six patients (12%). Chimerism was detected in bone marrow and peripheral blood on T-lymphocytes and B-lymphocyte subpopulation after sorting at monthly intervals in the posttransplant period and than in 6 months interval. Results: Hematological toxicities after RIC-HCT were moderate. The majority of patients (96%) engrafted with neutrophiles >500/μ L median at day 22 after HCT. Six (12%) and 15 (30%) patients maintained absolute neutrophil counts (ANC) >0,5 × 109/L and platelet counts >50 × 109/L, respectively. T-cell donor chimerism increased to >95% at day 56 and B-cell donor chimerism to 94% at day +360, respectively. B-CLL cells disappeared completely on day +360 (median 0%). Overall survival (OS) at 4 years was 51%, Non relapse related mortality (NRM) 30%, Progression-free survival 33% and progression/relapse 37%. The most common causes of NRM were GvHD (n= 7; 14%) and sepsis (n=3, 6%). Factors significantly associated with increased risk of relapse/progression were intermediate/advanced disease vs. CR/PR1 (p=0.022) and lymphocytes ≥ 5 × 109/L vs. < 5 × 109/L (18% vs. 58%, p= 0.00) at 12 months in univariate analysis. Conclusion: Full donor T-cell chimerism was reached early after HCT, while B-cell reconstitution was observed only 1.5 years after RIC-HCT despite the absence of evident disease by 360 days after RIC-HCT. Best predictor for Progression-free survival (PFS) was CR or PR1. Disclosures: Pönisch: Mundipharma: Honoraria, Research Funding." @default.
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- W2559303890 date "2011-11-18" @default.
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- W2559303890 title "Kinetics of Engraftment and Predictors of Outcome in Patients with Advanced Chronic Lymphocytic Leukaemia (CLL) After Treatment with Low Dose Total Body Irradiation (TBI) Followed by related or unrelated hematopoietic Stem Cell Transplantation" @default.
- W2559303890 doi "https://doi.org/10.1182/blood.v118.21.4532.4532" @default.
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