Abstract
Purpose
Current clinical and imaging tools remain suboptimal for predicting treatment response and prognosis in CNS lymphomas. We investigated the prognostic value of baseline [18F]FDG PET in patients with CNS lymphoma receiving ibrutinib-based treatments.
Methods
Fifty-three patients enrolled in a prospective clinical trial and underwent brain PET before receiving single-agent ibrutinib or ibrutinib in combination with methotrexate with or without rituximab. [18F]FDG uptake in these lesions was quantified by drawing PET volumes of interest around up to five [18F]FDG-avid lesions per patient (with uptake greater than surrounding brain). We measured standardized uptake values (SUVmax), metabolic tumor volumes, total lesion glycolysis (TLG), and the sum thereof in these lesions. We analyzed the relationship between PET parameters and mutation status, overall response rates, and progression-free survival (PFS).
Results
Thirty-eight patients underwent single-agent therapy and 15 received combination therapy. On PET, 15/53 patients had no measurable disease. In the other 38 patients, a total of 71 lesions were identified on PET. High-intensity [18F]FDG uptake and a larger volume of [18F]FDG-avid disease were inversely related to treatment outcome (p ≤ 0.005). In univariable analysis, PFS was linearly correlated with all PET parameters, with stronger association when sum-values were used. A multivariable model showed that risk of progression increased by 9% for every 5-unit increase in sumSUVmax (hazard ratio = 1.09 [95% CI: 1.04 to 1.14]).
Conclusion
Higher lesional metabolic parameters are inversely related to outcome in patients undergoing ibrutinib-based therapies, and sumSUVmax emerged as a strong independent prognostic factor.
Trial registration
NCT02315326; https://clinicaltrials.gov/ct2/show/NCT02315326?term=NCT02315326&draw=2&rank=1
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Acknowledgements
We thank Leah Bassity for her expert editorial support.
Funding
This work was supported by a research grant from Pharmacyclics to MSK. Pharmacyclics was not involved in the design or conduct of the study. The statistical analysis plan and data analyses were performed by MSK investigators. This study was partially supported by the National Institutes of Health/National Cancer Institute Cancer Center Support Grant (P30 CA008748), National Institutes of Health/National Cancer Institute Paul Calabresi Career Development Award for Clinical Oncology (K12 CA184746 to S.K.), and National Institutes of Health MSK SPORE in Lymphoma (P50 CA192937 to S.K.), as well as by grants from Cycle for Survival Equinox (C.G.) and the Leukemia & Lymphoma Society (C.G.).
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Conceived and designed the study: S.K., C.G., and H.S.; collected, analyzed, and interpreted the data: S.K., A.M., O.Y., V.H., J.H.F., L.R.S., I.K.M., C.G., and H.S.; performed statistical analysis: A.M.; wrote the manuscript: S.K., C.G., and H.S.; reviewed the data and edited and approved the final version of the manuscript: all authors.
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All procedures involving human participants were performed in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
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Informed written consent was obtained from all individual participants included in the study.
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C.G. reports consulting for BTG International and Kite. The remaining authors have no competing interests.
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Krebs, S., Mauguen, A., Yildirim, O. et al. Prognostic value of [18F]FDG PET/CT in patients with CNS lymphoma receiving ibrutinib-based therapies. Eur J Nucl Med Mol Imaging 48, 3940–3950 (2021). https://doi.org/10.1007/s00259-021-05386-0
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DOI: https://doi.org/10.1007/s00259-021-05386-0