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Reduced dose of posttransplant cyclophosphamide in HLA-haploidentical peripheral blood stem cell transplantation

Abstract

Posttransplant cyclophosphamide (PTCy:100 mg/kg) has been increasingly used in allogeneic hematopoietic stem cell transplantation, however, few studies compared different doses of PTCy. We conducted two consecutive prospective multicenter phase II studies to evaluate the safety and efficacy of 80 mg/kg of PTCy in 137 patients who underwent HLA-haploidentical peripheral blood stem cell transplantation (haploPBSCT) following reduced-intensity conditioning (RIC). GVHD prophylaxis consisted of PTCy at a dose of 40 mg/kg/day on days 3 and 4, tacrolimus, and mycophenolate mofetil. Neutrophil engraftment was achieved in 97% and 96% in the first and second studies, respectively. The incidences of grades II–IV acute GVHD, III–IV acute GVHD, all grade chronic GVHD, and moderate to severe chronic GVHD at 2 years were 26%, 5%, 35%, and 18% in the first study, and 23%, 1%, 28%, and 15% in the second study, respectively. Overall survival (OS), disease-free survival (DFS), and non-relapse mortality (NRM) at 2 years were 51%, 42%, and 18% in the first study, and 58%, 48%, and 16% in the second study, respectively. The rates of off-immunosuppressants in patients who survived without relapse at 2 years were 83 and 76%. Our results suggest that 80 mg/kg of PTCy is a valid option in haploPBSCT following RIC.

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Fig. 1: Time course of body temperature during the cytokine release syndrome early after haploPBSCT.
Fig. 2: Acute and Chronic GVHD.
Fig. 3: NRM.
Fig. 4: OS stratified by refined DRI.
Fig. 5: Systemic immunosuppression discontinuation.

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Acknowledgements

This work was supported by the grant from Regional Medicine Research Foundation (Tochigi, Japan), North Japan Hematology Study Group (NJHSG), and Japan Agency for Medical Research and Development (AMED, 19ek0510025h0002).

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Correspondence to Takanori Teshima.

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Sugita, J., Kamimura, T., Ishikawa, T. et al. Reduced dose of posttransplant cyclophosphamide in HLA-haploidentical peripheral blood stem cell transplantation. Bone Marrow Transplant 56, 596–604 (2021). https://doi.org/10.1038/s41409-020-01065-0

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