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Ependymoma, HGG, and DIPG are gliomas that are often difficult to treat, frequently aggressive, and often carry an extremely poor prognosis. While external beam radiation therapy (EBRT) remains a central component of the management of pediatric gliomas, it is limited by tolerance of the surrounding normal brain tissue. Rhenium-186 NanoLiposome (186RNL) permits the selective delivery of beta-emitting radiation of high specific activity with excellent retention in the tumor. In a Phase 1 trial in adults with recurrent glioblastoma (NCT01906385), the mean absorbed dose to the tumor when coverage was 75% or greater (n=10) was 392 Gy (CI 306 – 478). Thus far, the therapy has been well tolerated, no dose-limiting toxicity has been observed, and no treatment-related serious adverse events have occurred despite markedly higher absorbed doses than typically delivered by EBRT (n=18). Methods This is a two-part, Phase 1 dose-finding study followed by an expansion cohort to explore efficacy. Part 1 will enroll up to 18 subjects to determine the maximum feasible dose (MFD) of 186RNL administered by convection enhanced delivery (CED). Tumor size will be limited to a diameter of 4 cm in the longest axis and a volume of 34 mL. The dose limiting toxicity period (DLT) is 28 days post infusion. Part 2 will independently evaluate 186RNL in 3 different cohorts: Cohort A: up to 12 subjects with a diagnosis of recurrent, refractory, or progressive ependymoma; Cohort B: up to 12 subjects with a diagnosis of recurrent, refractory, or progressive HGG; Cohort C: up to 15 subjects with newly diagnosed DIPG. The primary endpoint is overall response rate (ORR) by Radiographic Assessment in Pediatric Neuro-Oncology (RAPNO) criteria. Secondary endpoints are PFS-24 and OS-24 in Cohort A and PFS-12 and OS-12 in Cohorts B and C. Planned enrollment will begin in H2 2021.

neuro-oncology

EPCT-18. A TWO-PART, PHASE 1 STUDY OF RHENIUM-186 NANOLIPOSOME (186RNL) DELIVERED BY CONVECTION ENHANCED DELIVERY FOR RECURRENT, REFRACTORY, OR PROGRESSIVE EPENDYMOMA AND HIGH-GRADE GLIOMA (HGG) AND NEWLY DIAGNOSED DIFFUSE INTRINSIC PONTINE GLIOMA (DIPG)