TIPS-17 A FIRST-IN-HUMAN FEASIBILITY STUDY TO EVALUATE THE SAFETY OF SELECTIVE INTRA-ARTERIAL YTTRIUM-90 MICROSPHERE TREATMENT IN PATIENTS WITH RECURRENT GLIOBLASTOMA (THE FRONTIER TRIAL)

BACKGROUND: Glioblastoma (GBM) is the most aggressive primary brain tumor that virtually always recurs with no established standard therapy at recurrence. Median survival after recurrence is 7-12 months. Selective internal radiation therapy (SIRT) with Yttrium-90 (Y90) glass microspheres (TheraSphere™, Boston Scientific, Marlborough, MA) is an FDA approved standard treatment for hepatocellular carcinoma, and represents a novel strategy to treat regionally localized brain tumors. We are conducting a first-in-human clinical trial (under IDE) using Y90 microspheres modified to treat tumors in the brain. The goal of selectively delivering Y90 intra-arterially is to achieve higher tumoral absorbed doses while limiting non-target exposure. DESIGN: The primary objective is to evaluate the safety of Y90 microspheres treatment. Target enrollment is 12 patients at 5 participating medical centers. Key inclusion criteria include: 1st or 2nd recurrence of GBM , size 1-5cm, located in the non-dominant hemisphere in a non-eloquent region, accessible neurovascular anatomy for single intra-arterial treatment based on a diagnostic cerebral angiogram. After consent, patients will undergo screening angiography and imaging that be reviewed by the trial steering committee to determine treatment suitability. Treatment consists of Y90 microspheres administered intra-arterially to deliver 40Gy ± 10% to the treatment volume. Post-administration Y90 PET and MRI images allow assessment of dose distribution and acute safety. Following overnight admission, patients will be followed as outpatients weekly x 4, and then monthly up to month 6. Primary endpoints include treatment-related limiting toxicities, dose limiting toxicity defined as non-hematological toxicities ≥ grade 3, CNS toxicity ≥ grade 3 (eg. symptomatic ischemia or edema) related to non-target embolization, occurring through 30 days post procedure. Secondary endpoints include: treatment-related serious adverse events, change in post-treatment neurological function, technical success, objective response rate, progression-free survival, and overall survival. The study is registered with clinicaltrials.gov, number: NCT05303467.