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Patients with B-cell lymphomas have altered cellular components of vaccine responses due to malignancy and therapy, and the optimal timing of vaccination relative to therapy remains unknown. Severe acute respiratory syndrome coronavirus 2 vaccines created an opportunity for new insights in vaccine timing because patients were challenged with a novel antigen across multiple phases of treatment. We studied serologic messenger RNA vaccine response in retrospective and prospective cohorts with lymphoma and chronic lymphocytic leukemia, paired with clinical and research immune parameters. Reduced serologic response was observed more frequently during active treatment, but nonresponse was also common within observation and posttreatment groups. Total immunoglobulin A and immunoglobulin M correlated with successful vaccine response. In individuals treated with anti-CD19-directed chimeric antigen receptor-modified T cells, nonresponse was associated with reduced B and T follicular helper cells. Predictors of vaccine response varied by disease and therapeutic group, and therefore further studies of immune health during and after cancer therapies are needed to individualize vaccine timing., Competing Interests: Potential conflicts of interest. E. A. C. receives research support from Genentech/Roche and AbbVie and has served as a consultant for Beigene, AstraZeneca, and TG Therapeutics. J. S. has served as a consultant for ATARA, AstraZeneca, Celgene Corporation, Adaptive, and Genmab, and receives research support from AstraZeneca, Merck, Incyte, Bristol-Myers Squibb, Pharmacyclics, TG Therapeutics, Seattle Genetics, and Adaptive. S. K. B. received honoraria from Acrotech, Seagen, Kyowa Kirin, and Daiichi Sankyo. S. D. N. receives research support from Roche, Rafael, ATARA, Pharmacyclics, and Takeda/Millennium; is a data monitoring committee member for Merck; and has served as a consultant for Epizyme and Morphosys. D. J. L. received research funding from Curis and Triphase; is a data and safety monitoring board member for Karyopharm; and has served as a consultant for Morphosys/Incyte, Epizyme, and ADC Therapeutics. J. N. G. received research funding from Loxo and has served as a consultant for Genentech, AbbVie, and Kite. E. L. P. received funding from Roche Diagnostics Corporation for the evaluation of serologic tests for SARS-CoV-2. E. J. W. is consulting or is an advisor for Merck, Marengo, Janssen, Related Sciences, Synthekine, and Surface Oncology; is a founder of Surface Oncology, Danger Bio, and Arsenal Biosciences; and is an inventor on a patent (US patent number 10,370,446) submitted by Emory University that covers the use of PD-1 blockade to treat infections and cancer. S. J. S. reports research funding from Acerta, Celgene, Genentech/Roche, Merck, Novartis, Pharmacyclics, and TG Therapeutics; received honoraria/consulting fees from Acerta, AstraZeneca, Celgene, Incyte, Janssen, Loxo Oncology, Morphosys, and Nordic Nanovector; is a steering committee member for Celgene, Nordic Nanovector, and Novartis; and has a patent for combination therapies of CAR T cells and PD-1 inhibitors. M. R. holds patents related to CAR T cells; has served as a consultant for nanoString, BMS, GSK, Bayer, Sana Therapeutics, and AbClon; receives research funding from AbClon, nanoString, viTToria biotherapeutics, Oxford Nanoimaging, and Beckman Coulter; and is the scientific founder of viTToria Biotherapeutics. All other authors report no potential conflicts. All authors have submitted the ICMJE Form for Disclosure of Potential Conflicts of Interest. Conflicts that the editors consider relevant to the content of the manuscript have been disclosed., (© The Author(s) 2024. Published by Oxford University Press on behalf of Infectious Diseases Society of America. All rights reserved. For commercial re-use, please contact reprints@oup.com for reprints and translation rights for reprints. All other permissions can be obtained through our RightsLink service via the Permissions link on the article page on our site—for further information please contact journals.permissions@oup.com.)