PRIMARY OBJECTIVES:
1. Examine and describe the safety and feasibility of EGFRvIII-specific hinge-optimized CD3 ζ-stimulatory/41BB-co-stimulatory Chimeric Antigen Receptor autologous T-lymphocytes (EGFRvIII -CAR T cells) through intracerebroventricular (ICV) delivery as adjuvant therapy in participants with EGFRvIII+ leptomeningeal disease from glioblastoma.
2. Determine the activity of EGFRvIII -CAR T cells based on survival rate at 12 months for both arms.
SECONDARY OBJECTIVES:
1. Describe persistence, expansion and phenotype of endogenous and EGFRvIII -CAR T cells in peripheral blood (PB), tumor cyst fluid (TCF) and cerebral spinal fluid (CSF) at applicable time points
2. Describe cytokine levels in PB, TCF, and CSF at applicable time points
3. Estimate the rate of disease response by Response Assessment in Neuro-Oncology Leptomeningeal Metastases (RANO LM) criteria
4. Estimate rate of progression free survival at 6 months. Estimate rate of overall survival (OS) at 12 months by study arm.
5. Estimate time to next treatment
6. Evaluate EGFRvIII -CAR T cell persistence in the tumor tissue and the location of the EGFRvIII -CAR T cells with respect to the infusion site.
7. Evaluate biomarkers and cytokine levels
OUTLINE:
Patients receive EGFRvIII -CAR T cells intracerebroventricular over 15 minutes on day 1. Patients may receive additional cycles based on the persistence of the cells. The patients are followed extensively according to the clinical pharmacology sampling plan; on days 1-30, months 2-12, and three times per year up to 10 years based on response
