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- W4223646071 abstract "Reduced-intensity conditioning (RIC) regimens frequently provide insufficient disease control in patients with high-risk hematologic malignancies undergoing allogeneic hematopoietic stem cell transplantation (HSCT). We evaluated intensification of fludarabine/busulfan (Flu/Bu) RIC with targeted marrow irradiation (TMI) in a dose escalation with expansion phase I clinical trial. TMI doses were delivered at 1.5 Gy in twice daily fractions on days -10 through -7 (dose levels: 3 Gy, 4.5 Gy, and 6 Gy), Flu (30 mg/m2 for 5 days) and Bu (area under the curve, 4800 µM*minute for 2 days). Eligible patients were age ≥18 years with high-risk hematologic malignancy and compromised organ function ineligible for myeloablative transplantation (n = 26). The median patient age was 64 years (range, 25 to 76 years). Nineteen patients (73%) had active or measurable residual disease at transplantation. One-year disease-free survival and overall survival were 55% (95% confidence interval [CI], 34% to 76%) and 65% (95% CI, 46% to 85%), respectively. Day +100 and 1 year transplantation-related mortality were 4% (95% CI, 0.6% to 27%) and 8.5% (95% CI, 2% to 32%), respectively. The 1-year cumulative incidence of relapse was 43% (95% CI, 27% to 69%). Rates of grade II-IV and III-IV acute GVHD rates were 57% (95% CI, 39% to 84%) and 22% (95% CI, 9% to 53%), respectively. Whole blood immune profiling demonstrated enrichment of central/transitional memory-like T cells with higher TMI doses, which correlated with improved survival compared with control samples from patients undergoing allogeneic HSCT. Intensification of a Flu/Bu RIC regimen with TMI is feasible with a low incidence of transplantation-related mortality in medically frail patients with advanced malignancies. The recommended phase 2 TMI dose is 6 Gy." @default.
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- W4223646071 date "2022-07-01" @default.
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- W4223646071 title "Targeted Marrow Irradiation Intensification of Reduced-Intensity Fludarabine/Busulfan Conditioning for Allogeneic Hematopoietic Stem Cell Transplantation" @default.
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- W4223646071 doi "https://doi.org/10.1016/j.jtct.2022.04.001" @default.
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