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• W4313430197 abstract "Abstract Current chimeric antigen receptor-modified (CAR) T cell therapy products are evaluated in bulk, without assessment of the possible heterogeneity in effector potential between cells. Conceivably, only a subset of the pre-infusion product differentiates into optimal effectors. We generated a comprehensive single-cell gene expression and T cell receptor (TCR) sequencing dataset using both pre- and post-infusion CD19-CAR T cells from peripheral blood and bone marrow of pediatric patients with B cell acute lymphoblastic leukemia (B-ALL). We identified potent effector post-infusion cells with identical TCRs to a subset of pre-infusion CAR T cells. Effector precursor CAR T cells exhibited a unique transcriptional profile compared to other pre-infusion cells, and the number of effector precursor cells infused correlated with peak CAR T cell expansion. Additionally, we identified an unexpected cell surface phenotype (TIGIT+, CD62Llo, CD27−), conventionally associated with inhibiting effective T cell responses, that we used to successfully enrich for subsequent effector potential. Collectively, these results demonstrate that highly diverse effector potentials are present among cells in pre-infusion cell products, which can be exploited for diagnostic and therapeutic applications. Furthermore, we provide an integrative experimental and analytical framework for elucidating the biological mechanisms underlying effector development in other CAR T cell therapy products. This work was supported by the National Institutes of Health (NIH)/National Cancer Institute grant P30CA021765, NIH grants U01AI150747 and R01AI136514 (PGT), the American Society of Transplantation and Cellular Therapy (AT), the American Society of Hematology (AT), the Key for a Cure Foundation (PGT), the Mark Foundation ASPIRE Award (PGT), and the American Lebanese Syrian Associated Charities (SG, PGT). Part of the laboratory studies were performed by the Center for Translational Immunology and Immunotherapy (CeTI2), which is supported by SJCRH. The content is solely the responsibility of the authors and does not necessarily represent the official views of the NIH." @default.
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• W4313430197 date "2022-05-01" @default.
• W4313430197 modified "2023-09-24" @default.
• W4313430197 title "Common trajectories of highly effective CD19-specific CAR T cells identified by endogenous T cell receptor lineages" @default.
• W4313430197 doi "https://doi.org/10.4049/jimmunol.208.supp.120.15" @default.
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