HGG-10. A SAFETY AND EFFICACY STUDY OF NOVOTTF-100A FOR PEDIATRIC HIGH-GRADE GLIOMA: RESULTS OF THE PLANNED INTERIM ANALYSIS OF THE FIRST THREE CASES

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Abstract BACKGROUND The safety and efficacy of Tumor-Treating Fields (TTFields) therapy for pediatric diffuse high-grade glioma (HGG) are uncertain. Despite differences between adult GBM and pediatric HGG in terms of genetic etiology, both have certain clinical behaviors in common, allowing TTFields therapy to be tested in pediatric HGG. METHODS The present study [jRCTs032200423] aims to evaluate the safety of NovoTTF-100A in pediatric HGG and conduct an exploratory analysis of its efficacy. The target population is ten children aged 5 to 17 years with newly diagnosed supratentorial HGG or its first-recurrence following frontline therapy. After completion of surgical resection of the tumor and radiation therapy, all the patients will receive TTFields therapy using NovoTTF-100A for 28 days per course for up to 26 courses until the end-of-therapy criteria (including disease progression) are met. The primary endpoint is the adverse event rate with causality. The secondary endpoints include various efficacy parameters and quality of life. In total, the ten patients will be enrolled by September 2023. RESULTS The planned interim analysis, which was done in October 2022, included 3 female patients aged 14, 17, and 9 years, respectively. All had a histological grade 4 tumor, two of which were radiation-induced secondary HGG. Although the first patient with recurrent disease had early progression after enrollment and experienced disease-related adverse events, no serious, treatment-related toxicities or device-related issues were observed. The second patient had a recurrence after six courses, and the third patient remained through the second course. All 3 patients were able to maintain device usage of 75% or more of the time, in alignment with use recommendations, suggesting treatment feasibility. DISCUSSION Based on the results presented above, the study was resumed as the current, multicentric study aimed at obtaining approval for the expanded use of NovoTTF-100A for pediatric HGG.

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