CAR T-cell therapy in pediatric brain tumors: a narrative review with comparative analysis of clinical trial eligibility criteria.
This narrative review synthesizes 18 preclinical, translational, and early-phase studies and compares eligibility criteria across 12 registered CNS CAR T-cell trials, highlighting preliminary activity, target-specific opportunities, toxicities, and barriers in pediatric brain tumors.
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This narrative review synthesizes 18 preclinical, translational, and early-phase studies and compares eligibility criteria across 12 registered CNS CAR T-cell trials, highlighting preliminary activity, target-specific opportunities, toxicities, and barriers in pediatric brain tumors.
Research significance
The supplied evidence suggests that locoregional or otherwise CNS-accessible CAR T cells directed against targets such as B7-H3 or GD2 may benefit selected pediatric brain tumors; multi-antigen targeting and modified CAR designs could theoretically limit antigen escape or improve activity, but these strategies remain investigational and are not established as safe or effective therapies.
Source abstract
Pediatric brain tumors are the leading cause of cancer-related mortality in children, and current standard therapies like surgery, radiotherapy, and chemotherapy offer limited survival benefits and significant long-term morbidity. Chimeric antigen receptor (CAR) T-cell therapy is a transformative treatment for hematologic malignancies and is now being explored for pediatric brain tumors. This review summarizes the latest advances, preclinical and clinical findings, challenges of CAR T-cell therapy, and future directions in pediatric neuro-oncology. 18 studies that met the eligibility criteria were selected, consisting of preclinical models, early-phase clinical trials, and translational studies. A registry search of central nervous system (CNS) tumor trials from Clinicaltrials.gov, ISRCTN, and ANZCTR identified 12 active or completed interventional trials of CAR T-cell therapy in patients with CNS tumors, their eligibility criteria and parameters were compared. Preclinical studies consistently demonstrate that CAR T-cells targeting antigens such as B7-H3, GD2, HER2, IL13Rα2, and EphA2 can induce robust and specific tumor regression in models of medulloblastoma, diffuse intrinsic pontine glioma (DIPG), ependymoma, and high-grade gliomas. On the other hand, B7-H3 is a pan-pediatric target due to its high expression in multiple CNS tumors, including medulloblastoma, ependymoma, and glioma, whereas GD2 is highly relevant for H3K27M-mutant diffuse midline gliomas. Early-phase clinical trials confirm that CAR T-cells can traffic to CNS tumors, infiltrate tumor tissue, and mediate tumor regression. The ICV B7-H3 phase 1 trial in DIPG achieved noteworthy results, with a median survival of 19.8 months across 21 patients and 3 patients surviving more than 40 months. GD2-CAR T-cell therapy in H3K27 M-mutant gliomas showed partial clinical responses, with neurotoxicity and encephalopathy observed, whereas the HER2-targeted locoregional therapy showed no dose-limiting toxicities. Future interventions such as multi-antigen targeting, combinatorial CAR designs, and enhanced cytokine signaling are being developed to improve efficacy and safety. A comparison of 12 registered pediatric CAR T-cell trials showed heterogeneity in eligibility criteria, including age ranges, performance status thresholds, H3K27M mutation requirements, and geographic concentration bias. CAR T-cell therapy holds significant promise for improving outcomes in pediatric brain tumors, but its clinical translation is challenged by tumor heterogeneity, antigen escape, neurotoxicity, and the immunosuppressive tumor microenvironment.