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CBMT-43. INTEGRATED LIPIDOMIC AND MOLECULAR ANALYSIS REVEALS A SUBSET OF GLIOBLASTOMA VULNERABLE TO FERROPTOSIS


 Cancers, including the universally lethal glioblastoma (GBM), have reprogrammed lipid metabolism to fuel tumor growth. However, the molecular alterations responsible for aberrant lipid metabolism, and the potential for identifying new therapeutic opportunities are not fully understood. To systematically investigate the GBM lipidome, we performed integrated transcriptomic, genomic and shotgun lipidomic analysis of a library of molecularly diverse patient-derived GBM cells (n=30). Using this comprehensive approach, we discovered two GBM sub-groups defined by their combined molecular and lipidomic profile. Polyunsaturated fatty acids (PUFAs) were among the most significant lipids that distinguished these two groups of GBM tumors. Intriguingly, this lipid metabolic phenotype was associated with heightened sensitivity to ferroptosis – a newly discovered form of regulated cell death. As PUFA oxidation is a critical feature of ferroptosis, our findings suggest a novel association between specific molecular signatures of GBM, lipid metabolism and ferroptosis. This relationship may present a new therapeutic opportunity to target ferroptosis in a molecularly-defined subset of GBMs.