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Post-transplant cyclophosphamide compared to sirolimus/tacrolimus in reduced intensity conditioning transplants for patients with lymphoid malignancies

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Abstract

Despite novel cellular and immunomodulatory therapies, allogeneic hematopoietic stem cell transplantation (HSCT) remains a treatment option for lymphoid malignancies. Post-transplant cyclophosphamide (PTCY) is increasingly employed for graft vs. host disease (GVHD) prophylaxis. This study aims to evaluate the safety and efficacy of PTCY in reduce intensity (RIC) HSCT for patients with lymphoid neoplasms compared to sirolimus with tacrolimus (SIR/TAC). The primary endpoint was to compare grade III-IV acute GVHD, severe chronic GVHD, and relapse-free survival (GRFS) between the two GVHD prophylaxis strategies. This study, conducted from January 2012 to December 2020, included 171 consecutive patients (82 in the PTCY and 89 in the SIR/TAC group). Results revealed a significantly decreased incidence of moderate and severe forms of chronic GVHD in PTCY cohort (5.8% [95% CI, 1.8 to 13.1]) versus the SIR/TAC cohort (39.6% [95% CI, 29.3 to 49.7] (p < 0.001)). Other outcomes, including GRFS (PTCY [45.9% (95% CI, 35.8–58.7)] and SIR/TAC groups [36.8% (95% CI, 28–48.4)], (p = 0.72)), non-relapse mortality (NRM), relapse and overall survival (OS) were similar in both groups. Interestingly, the failure to achieve GRFS was mainly attributed to GVHD in the SIR/TAC group, while disease relapse was the primary reason in the PTCY cohort.

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Fig. 1: Cummulative incidence of GVHD, NRM and relapse in PTCY vs SIR/TAC groups.
Fig. 2: DFS, OS and GRFS in PTCY vs SIR/TAC groups.
Fig. 3: Events responsible for GRFS failure in PTCY vs SIR/TAC groups.

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Data availability

The datasets generated during and/or analysed during the current study are available from the corresponding author on reasonable request.

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Acknowledgements

M.L.F. is PhD candidate at Universidad Autònoma de Barcelona. This work is submitted in partial fulfillment of the requirement for the PhD.

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M.L.F. designed the research, analyzed results, made the figures and wrote the paper. I.G. C., P.B and D.V. designed the research; V.N. performed statistical analysis and made the figures; K.M., A.P.M., I.S.B., C.F.C, L.B.M., R.B., E.R., R. P.P, A.E. and A.G.M., collected data. And all authors contributed to the manuscript review and approved the final version for submission.

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Correspondence to Maria Laura Fox.

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Competing interests

R.B.A.: Speaker: Pfizer, Gilead. Travel: Jazz, Pfizer, Gilead, AstraZeneca. Funding: Jazz. M.K. Gilead, Novartis, BMS and Pfizer. All other authors declare no competing financial interests. The current affiliation for CF is Division of Hematology, Hospital del Mar, Barcelona, Spain.

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All transplantation centers are required to obtain written informed consent from all patients before data registration with the EBMT in accordance with the 1975 Helsinki Declaration.

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Institutional Review and Privacy Board of University Hospital Vall d´Hebron granted approval for this retrospective review (reference code HEM-TIO-2017-01).

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Fox, M.L., García-Cadenas, I., Navarro, V. et al. Post-transplant cyclophosphamide compared to sirolimus/tacrolimus in reduced intensity conditioning transplants for patients with lymphoid malignancies. Bone Marrow Transplant (2024). https://doi.org/10.1038/s41409-024-02322-2

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