Robust expansion of P-PSMA-101 CAR T cells resulted in toxicity but also durable responses in patients with mCRPC. Future trials of CAR T may be informed by the results with this nonviral engineering, TSCM cell-enriched approach.
P1, N=13, Active, not recruiting, Memorial Sloan Kettering Cancer Center | Trial completion date: Jun 2025 --> Jun 2026 | Trial primary completion date: Jun 2025 --> Jun 2026
10 months ago
Trial completion date • Trial primary completion date
Herein, we develop an approach for in situ T cell generation, tracking, and functional assessment using anti-CD5-conjugated lipid nanoparticles for codelivering CD19 CAR mRNA (mCAR19) and a prostate-specific membrane antigen mRNA (mPSMA) tag. With interleukin-7 (IL-7) preconditioning and repeated administration, this approach achieves tumor-free survival in 75% of B cell lymphoma-bearing mice (similar efficacy to ex vivo approaches), and through PET imaging of 68Ga-PSMA-617, the generation and tumor infiltration of in situ-engineered PSMA-tagged CD19 CAR-T cells is validated.
In addition, PSMA-BB-Z-GITRL CAR-T cells produce higher levels of IFN-γ, TNF-α and IL-9 in mouse blood, exhibiting a higher proportion of TCM cells and a lower proportion of Treg cells compared to PSMA-BB-Z CAR-T cells. Our results demonstrate that the overexpression of GITRL has important implications for improving CAR-T cell-based human solid tumor immunotherapy.