Abstract
The EBMT recommends rabbit anti-thymocyte or anti-T-lymphocyte globulin (rATG/ATLG) as GVHD prophylaxis in matched sibling donor (MSD) allogeneic hematopoietic cell transplantation (allo-HCT). However, discrepancies between recommendations and clinical practice were reflected in the EBMT survey. Therefore, we performed retrospective EBMT registry analysis from 2014 to 2021 to reinforce the real-world evidence context of rATG/ATLG impact on post-transplantation outcomes. This study included 11,420 adult patients (non-ATG n = 7680 and ATG n = 3740) with hematological malignancies after the first allo-HCT from peripheral blood. Use of ATG was associated with a reduced risk of aGVHD II-IV (Day +100: non-ATG vs ATG, 27.6% vs. 21.6%; adjusted HR 0.7, p < 0.001) and cGVHD (2-year: non-ATG vs ATG, 48.9% vs 30%; adjusted HR 0.45, p < 0.001), improved OS (2-year: 62.9% vs 63.3%; adjusted HR 0.89, p = 0.009), reduced NRM (2-year: 16% vs 12.5%; adjusted HR 0.63, p < 0.001), and higher GRFS (2-year: 32.2% vs 40.7%; adjusted HR 0.72, p < 0.001). While RI was higher in the ATG group (2-year: non-ATG vs ATG, 30.2% vs 34.7%; adjusted HR 1.22, p < 0.001) it did not translate into a significantly lower PFS (2-year: 53.9% vs 52.8%; adjusted HR not significant). Overall, outcomes were favorable for the intermediate rATG/ATLG dose ranges compared to the low and high dose ranges. Administration of rATG/ATLG improved outcomes in MSD allo-HCT recipients, supporting the EBMT recommendation for its use.
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AP: concept and design of a study, interpretation of the results, reference search, writing a manuscript, preparing tables and figures; MA: Registry data preparation, statistical analysis, preparing tables and figures, drafting and critical revision of the manuscript; WB: Registry data preparation, statistical analysis, drafting and critical revision of the manuscript; ChP: Registry data preparation, statistical analysis, drafting and critical revision of the manuscript; JMZ: concept of a study, interpretation of the results, drafting and critical revision of the manuscript; NK: drafting and critical revision of the manuscript; RZ: critical revision of the manuscript; FC: drafting and critical revision of the manuscript; TS: critical revision of the manuscript; TL: critical revision of the manuscript; JP: critical revision of the manuscript; DK: critical revision of the manuscript; MS: critical revision of the manuscript; IWB: critical revision of the manuscript; UP: critical revision of the manuscript; IJ-A: critical revision of the manuscript; DB: critical revision of the manuscript; AMR: critical revision of the manuscript; JT: critical revision of the manuscript; EMW-D: critical revision of the manuscript; JW: critical revision of the manuscript; ChS: critical revision of the manuscript; GGW: critical revision of the manuscript; ME: critical revision of the manuscript; JM: critical revision of the manuscript; FS: critical revision of the manuscript; JV: critical revision of the manuscript; PZ: critical revision of the manuscript; IM: drafting and critical revision of the manuscript; HS: drafting and critical revision of the manuscript; OP: drafting and critical revision of the manuscript; ZP: drafting and critical revision of the manuscript. All authors approved the final version.
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Nothing to declare for this topic, except potential relatedness to HCT/GVHD topics: AP has received honoraria or travel support from Alexion, AstraZeneca, Astellas, Gilead, MSD, Novartis, Pierre Fabre, Pfizer, Sanofi, and the EBMT (European Society for Blood and Marrow transplantation) which not directly related to this work. NK received honorarium from Mallinckrodt, Novartis, Kit/Gilead, BMS, Takeda, Medac, Neovii, Sanofi IYA: received honoraria from Gilead/Kite, BMS, Novartis and AstraZeneca. EMW-D reports personal fees from Novartis, Takeda, Janssen, Incyte, MEDAC. FS has received travel support from Janssen and Medac, honoraria from Medac, GWT, Abbvie, Servier and Pierre Fabre and research funding from Medac and Servier. HS reports having received personal fees from Incyte, Janssen, Novartis, Sanofi and from the Belgian Hematological Society (BHS), as well as research grants from Novartis and the BHS, all paid to her institution and not directly related to this work. She has also received non-financial support (travel grants) from Gilead, Pfizer, EBMT and the CIBMTR (Center for International Bone Marrow Transplantation Research). OP has received honoraria or travel support from Gilead, Jazz, MSD, Neovii, Novartis, Pfizer and Therakos. He has received research support from Incyte and Priothera. He is member of advisory boards to Equillium Bio, Jazz, Gilead, Novartis, MSD, Omeros, Priothera, Sanofi, Shionogi and SOBI. RZ reports having received personal fees from Incyte, MNK, Novartis, Sanofi, Medac and Neovii.
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Piekarska, A., Abouqateb, M., Boreland, W. et al. Improved GVHD-free relapse-free survival when rATG/ATLG is used in allo-HCT from matched sibling donors - an EBMT registry study by the Transplant Complications Working Party. Bone Marrow Transplant 60, 1574–1583 (2025). https://doi.org/10.1038/s41409-025-02692-1
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DOI: https://doi.org/10.1038/s41409-025-02692-1


