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Sequential treatment combining cladribine-based re-induction, myeloablative allogeneic HSCT, and prophylactic donor lymphocyte infusion: a promising treatment for refractory acute myeloid leukemia

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Abstract

We describe the first multicenter prospective study to assess the efficacy, safety, and immune reconstitution of a novel sequential transplant approach in 24 patients with primary induction failure/relapsed acute myeloid leukemia (AML). The sequential regimen consisted of cladribine 5 mg/m2/day and cytarabine 2 g/m2/day for 5 days and mitoxantrone 7 mg/m2/day for 3 days, followed by myeloablative allogeneic hematopoietic stem cell transplantation (allo-HSCT) using intravenous busulfan (3.2 mg/kg/day) for 4 days and cyclophosphamide (60 mg/kg/day) for 2 days. Patients in CR without acute graft-versus-host disease at day + 90 received prophylactic donor lymphocyte infusion (pDLI). At the time of transplantation, a marrow blast infiltration > 20% or any level of circulating blasts was found in 62.5% of patients. The cumulative incidence of relapse at 2 years was 29.8%. Overall survival (OS) was 74.5% at 1 year and 56.5% at 2 years. Leukemia-free survival (LFS) at 1 and 2 years was 62.5 and 50.5%, respectively. Multivariate analysis demonstrated that haploidentical related donor, pDLI, and experiencing chronic graft-versus-host disease (cGVHD) were protective from relapse. Total T cells and T cell subsets in peripheral blood recovered at 3 months post-HSCT. The expressions of immune checkpoints (cytotoxic T lymphocyte antigen 4 and programmed death 1) were extremely low in T cells over the first 1 year post-transplantation.

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Acknowledgements

We thank all transplant center physicians who participated in the study.

Funding

This work was funded in part by the National Natural Science Foundation of China (81470309).

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Conception and design: Haowen Xiao.

Collection, analysis, and interpretation of the data: Haowen Xiao, Li Li, Yuanbin Wu, Jiulong Wu, and Fen Huang.

Drafting the article: Haowen Xiao.

Provision of study materials or patients: Haowen Xiao, Li Li, Yan Pang, Yuanbin Wu, Zujun Jiang, Zenghui Liu, Jiulong Wu, Yang Xiao, Fen Huang, Qifa Liu, Hang Zhang, Yi Luo, and He Huang.

Obtaining of funding: Haowen Xiao.

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Correspondence to Haowen Xiao.

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Xiao, H., Li, L., Pang, Y. et al. Sequential treatment combining cladribine-based re-induction, myeloablative allogeneic HSCT, and prophylactic donor lymphocyte infusion: a promising treatment for refractory acute myeloid leukemia. Ann Hematol 97, 2479–2490 (2018). https://doi.org/10.1007/s00277-018-3453-z

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