Abstract 3331: NanoGlio recapitulates <i>IDH</i> -mutant glioma biology and therapeutic response to vorasidenib

Abstract IDH-mutant gliomas are a biologically and clinically distinct subset of diffuse gliomas that remain challenging to model in vitro. Vorasidenib, a brain-penetrant dual IDH1/2 inhibitor, is the first FDA-approved targeted therapy for grade 2 non-enhancing gliomas in 2024. Here, we present NanoGlio, a nanoliter-scale organoid platform that enables rapid, passage-zero functional drug testing using minimal patient-derived material. NanoGlio supports the formation of uniform, viable tumor organoids that preserve the cytoarchitecture and cellular heterogeneity of the parental tumors. We established NanoGlio models from 13 cases of grade 2, 5 cases of grade 3, and 9 cases of grade 4 IDH-mutant gliomas, including spatially distinct enhancing and non-enhancing regions from 4 patients. Single-cell RNA sequencing confirmed that NanoGlio retains tumor-intrinsic heterogeneity and myeloid lineages present in the original tissue. High-content phenotypic screening revealed heterogeneous responses to Vorasidenib, with NanoGlio sensitivity correlating with tumor grade and molecular subtype. Notably, Vorasidenib induced differentiation-like morphologic changes in grade 2 models but paradoxically enhanced proliferation in a subset of high-grade models. Bulk RNA sequencing showed that NanoGlio captures in vivo-like drug response programs, particularly in immune-related and glial differentiation pathways that overlap with molecular changes reported in clinical trials. Furthermore, NanoGlio-derived conditioned media, when applied to co-cultures of HER2-specific chimeric antigen receptor (CAR) T cells and HER2-positive SKOV3 tumor cells, enabled functional assessment of soluble factor-mediated immune suppression. Together, these data establish NanoGlio as a scalable, patient-relevant organoid platform for modeling IDH-mutant glioma biology and therapeutic response, with direct applications to drug-response prediction and rational combination strategies in precision oncology. Citation Format: Uijin Kim, Satoru Kawakita, Emily Miller, Wei Huang, Francisco Bustamante, Lauren Vanderpool, Chongming Jiang, Albert Lai, Zhaohui Wang. NanoGlio recapitulates IDH-mutant glioma biology and therapeutic response to vorasidenib [abstract]. In: Proceedings of the American Association for Cancer Research Annual Meeting 2026; Part 1 (Regular Abstracts); 2026 Apr 17-22; San Diego, CA. Philadelphia (PA): AACR; Cancer Res 2026;86(7 Suppl):Abstract nr 3331.