DIPG-56. PEDIATRIC GLIOMAS EXHIBIT A UNIQUE LIPID METABOLIC PHENOTYPE DISTINCT FROM ADULT GBMS

Pediatric and adult IDH-wildtype gliomas (GBM) differ in both their clinical and molecular characteristics. However, whether distinct metabolic vulnerabilities exist between these two types of malignant brain tumors is unknown. Here, we performed integrated molecular and lipidomic profiling of both adult IDHwt and pediatric gliomas to identify distinguishable lipid phenotypes and consequent vulnerabilities. This analysis revealed IDHwt gliomas have heightened de novo lipid biosynthetic programs with an elevated abundance of triacylglycerides (TAGs). By contrast, pediatric gliomas exhibited lower lipid biosynthetic capacity and contained a higher enrichment for phospholipids. As a consequence of this unique metabolic program, pediatric gliomas relied of uptake of environmental complex fatty acids derived from normal resident brain cells for growth. Accordingly, therapeutic abrogation of lipid scavenging pathways selectively inhibited proliferation of pediatric gliomas compared to adult IDHwt counterparts. Together, these studies identify distinct metabolic programs among adult and pediatric gliomas, revealing new therapeutically actionable targets to slow pediatric glioma growth.