Abstract
Allogeneic hematopoietic stem cell transplantation (Allo-HCT) remains the only curative treatment for myelofibrosis (MF). Transplantation in patients with MF is mostly done using a reduced intensity conditioning regimen with calcineurin inhibitors for graft versus host disease (GVHD) prophylaxis. Here we sought to evaluate outcomes of patients who underwent an ex vivo CD34+ -selected allo-HCT using myeloablative conditioning (MAC). Twenty-seven patients were included in this retrospective analysis. All patients were conditioned with busulfan, melphalan and fludarabine and antithymocyte globulin to prevent graft rejection. G-CSF mobilized peripheral blood stem cell grafts were depleted of T-cells using immunomagnetic CD34+ selection by CliniMACS device. Median follow-up among survivors was 50.6 months. The estimated 3-year overall survival, relapse free survival and the combined endpoint of GVHD/relapse free survival were 88% (95% CI, 75–100%), 80% (95% CI, 66–98%) and 74% (95% CI, 59–93%), respectively. The cumulative incidence of grade II-IV acute GVHD at day 100 was 33.3% (95% CI 16.4–51.3%), and two patients suffered chronic GVHD. There were no cases of primary graft failure. However, delayed graft failure occurred in two patients. We conclude that CD34+ selected allo-HCT with a MAC resulted in high survival rates in this cohort of patients with MF.
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Data availability
Raw data were generated at MSKCC. Derived data supporting the findings of this study are available from the corresponding author RT on request.
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This research was supported in part by National Institutes of Health award numbers P01 CA23766 and NIH/NCI Cancer Center Support Grant P30 CA008748. The content is solely the responsibility of the authors and does not necessarily represent the official views of the National Institutes of Health.
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MN and JL were responsible for extracting and analyzing data, interpreting results and creating summary tables they were responsible for writing the report, JF and SD conducted the analyses and interpreted results as well as provided feedback on the report, MM was responsible for screening potentially eligible studies. She contributed to extracting and analyzing data, AJ, EP, CC, DP, CS, MAP, SG, HCM provided feedback on the report, RT was responsible for designing the review protocol, writing the protocol and report, conducting the search, screening potentially eligible studies, extracting and analyzing data, interpreting results, updating reference lists and creating summary tables.
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Nawas, M.T., Lee, JO., Flynn, J. et al. CD34+ -selected hematopoietic stem cell transplant conditioned with a myeloablative regimen in patients with advanced myelofibrosis. Bone Marrow Transplant 57, 1101–1107 (2022). https://doi.org/10.1038/s41409-022-01684-9
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DOI: https://doi.org/10.1038/s41409-022-01684-9