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Real-world experience of belumosudil and belumosudil/ruxolitinib combination in steroid-refractory chronic graft-versus-host disease

Abstract

Belumosudil is approved after failure of ≥2 lines of therapy in chronic graft-versus-host disease cGVHD. However, real-world data is limited. We conducted a retrospective analysis of 67 patients with steroid-refractory or dependent (SR/SD) cGVHD. At baseline, most patients had advanced multi-organ cGVHD. The 6- and 12-month overall response rate (ORR) was 61%. However, a subset of patients achieved deeper responses with ongoing therapy at 12 months. The 6-month failure-free survival (FFS) was 75% (95%CI: 65–86) whereas the 12-month FFS was 66% (95%CI: 55–78). A low incidence of drug-related grade ≥3 toxicities was observed. A cohort of patients with immune function analysis showed gradual improvement in immune subsets at 1-year post-treatment. The combined bel-rux cohort (n = 14) showed a 6- and 12-month ORR of 64% and 57%, respectively. Overall, belumosudil was associated with high treatment response and survival outcomes. Notably, deeper responses were observed with ongoing therapy, and it was overall well tolerated. In a cohort of patients, immune cell populations had preserved to improved values throughout treatment. Patients who received bel-rux demonstrated efficacy and safety as well. Overall, our real-world study indicates similar findings to the clinical trial and supports the use of belumosudil in cGVHD.

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Fig. 1: Organ-specific response.
Fig. 2: Belumosudil overall response rate (ORR) at 6- and 12-months.
Fig. 3: Failure-free survival (FFS).
Fig. 4: Overall survival (OS).
Fig. 5: Combined belumosudil-ruxolitinib treatment overall response rate (ORR).
Fig. 6: Lymphocyte subsets measurement over 1-year.

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Data availability

The datasets generated and analyzed during the current study are available from the corresponding author on a reasonable request.

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Acknowledgements

The work was also supported in part by the Memorial Sloan Kettering Cancer Center Support Grant (P30 CA008748); National Institutes of Health award number 5R01-HL164902-02.

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Authors and Affiliations

Authors

Contributions

G.R., M.W., and D.M.P., designed the study, interpreted the data, and wrote the manuscript. D.N. and S.D. analyzed and interpreted the data and wrote the manuscript, I.G., A.S., P.M. collected the data, N.R. wrote the manuscript, M.A.P. interpreted the data and wrote the manuscript.

Corresponding author

Correspondence to Doris M. Ponce.

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Competing interests

M.A.P reports honoraria from Adicet, Allogene, Allovir, Caribou Biosciences, Celgene, Bristol-Myers Squibb, Equilium, Exevir, ImmPACT Bio, Incyte, Karyopharm, Kite/Gilead, Merck, Miltenyi Biotec, MorphoSys, Nektar Therapeutics, Novartis, Omeros, OrcaBio, Sanofi, Syncopation, VectivBio AG, and Vor Biopharma. He serves on DSMBs for Cidara Therapeutics and Sellas Life Sciences, and the scientific advisory board of NexImmune. He has ownership interests in NexImmune, Omeros and OrcaBio. He has received institutional research support for clinical trials from Allogene, Incyte, Kite/Gilead, Miltenyi Biotec, Nektar Therapeutics, and Novartis. D.M.P. has served as advisory board member for Evive Biotechnology (Shanghai) Ltd; has consulted, received honorarium from, or participated in the advisory boards for Sanofi, Ceramedix, and Incyte Corporation, and received research funding from Sanofi and Incyte. The other authors have no conflicts of interest to declare.

Ethics approval

All methods were performed in accordance with the relevant guidelines and regulations. This analysis was approved by the Memorial Sloan Kettering Cancer Center Institutional Review Board (IRB #16-501; characterization of graft-versus-host disease following hematopoietic stem cell transplantation). Written informed consent for participation was obtained from all study participants.

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Raju, G., Walji, M., Nemirovsky, D. et al. Real-world experience of belumosudil and belumosudil/ruxolitinib combination in steroid-refractory chronic graft-versus-host disease. Bone Marrow Transplant (2025). https://doi.org/10.1038/s41409-025-02721-z

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