Abstract
The optimization of bridging regimen before chimeric antigen receptor (CAR)-T cell therapy in diffuse large B-cell lymphoma (DLBCL) may impact CAR-T efficacy and outcome. This retrospective study evaluates CAR-T outcome after bridging with radiotherapy (RT) and other bridging strategies. Among 148 patients with relapsed/refractory DLBCL who underwent leukapheresis for CAR-T manufacturing, 31 received RT-bridging, 84 chemotherapy (CT), 33 no-bridging or steroid-only. CAR-T cell were infused in 96.8% of RT-group, 89.2% of CT-group and 78.8% of no-bridge-group (p = 0.079). Response to bridging was generally poor, but patients receiving RT had a significant reduction in LDH levels between pre- and post-bridging (p = 0.05). The one-year PFS was 51.2% in the RT-group, 28.2% in the CT-group, and 47.6% in the no-bridge-group (p = 0.044, CT-bridging vs RT-bridging); 1-year OS was 86.7% in the RT-group, 52.7% in the CT-group and 69% in the no-bridge-group (p = 0.025, CT-bridging vs RT-bridging). We observed a higher incidence of ICANS in patients who received CT than in others (20.0% CT-group, 3.3% RT-group, 7.7% no-bridge group; p = 0.05). In conclusion, RT-bridging is associated with lower drop-out rate and CAR-T toxicity, and it might be preferred to other bridging strategies for patients with localized disease or for those with one prevalent symptomatic site.
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Data availability
Informed consent was obtained from all participants. The datasets generated during and analysed during the current study are available from the corresponding author on reasonable request.
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Acknowledgements
Editorial assistance was provided by Luca Giacomelli, PhD, Valentina Attanasio and Massimiliano Pianta; this assistance was supported by internal funds.
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SB, DM and AS designed the study. LG analysed the data. DM wrote the manuscript, with the revision and active contribution by SB, AS, PLZ and PC. CDP, DT, AC, BC, PN, MS, PM actively managed the patients and contributed in collecting the data.
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Bramanti, S., Mannina, D., Chiappella, A. et al. Role of bridging RT in relapsed/refractory diffuse large B-cell lymphoma undergoing CAR-T therapy: a multicenter study. Bone Marrow Transplant 60, 32–38 (2025). https://doi.org/10.1038/s41409-024-02427-8
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DOI: https://doi.org/10.1038/s41409-024-02427-8
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