Next-generation CAR-T therapy for malignant brain tumors: latest updates from the 2026 AACR Annual Meeting
TL;DR
Findings support mechanism-informed CAR T-cell platforms, while emphasizing that durability, neurotoxicity, trafficking, immunogenicity, and patient selection require validation in larger clinical studies.
Abstract
The 2026 AACR Annual Meeting showcased rapid progress in chimeric antigen receptor (CAR) T-cell therapy for malignant brain tumors. This correspondence synthesizes 12 clinical and translational abstracts addressing early efficacy, resistance mechanisms, target discovery, and next-generation engineering. Phase I studies in glioblastoma demonstrated feasibility, manageable toxicity, cellular persistence, and preliminary radiographic activity, while revealing antigen loss and treatment-associated myeloid suppression. Longitudinal and spatial analyses further identified limited CAR T-cell persistence, anti-CAR immune responses, and remodeling of suppressive tumor niches. Preclinical strategies sought to overcome these barriers through programmable antigen recognition, alternative KIR/DAP12 signaling, stress-granule modulation, inducible metabolic support, membrane-tethered cytokine agonists, resistance to transforming growth factor beta, and dual targeting of tumor cells and immunosuppressive macrophages. Surfaceome profiling and affinity-guided receptor optimization also identified promising targets in glioblastoma and medulloblastoma. Collectively, these findings support mechanism-informed CAR T-cell platforms, while emphasizing that durability, neurotoxicity, trafficking, immunogenicity, and patient selection require validation in larger clinical studies.