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Glioblastoma (GBM) is one of the most lethal human tumors, and despite considerable advances in multimodality treatments consisting of surgical removal, radiation and chemotherapy, overall survival is 14 to 16 months after diagnosis. Therefore, there is a need to target non-apoptotic death pathways and inhibit pro-survival signaling mechanisms that contribute to both tumorigenesis and treatment resistance. Depending on tumor type and environment, autophagy modulation plays an important role in tumor cell survival and inhibition pathways. Increasing evidence supports that chemical modulation of autophagy inhibition and activation holds a therapeutic potential and these studies have led to the initiation of multiple clinical trials combining chemotherapeutic agents and autophagy inhibitors and activators for various cancer types. However, recent studies have also demonstrated a therapeutic potential for enhancers of autophagy in GBM. This clearly demonstrates the need for further investigation into the autophagy induced mechanism of GBM, and the development of better treatments. We have identified a new chemical entity VMY-BC-1 that showed promising effects in both serum and patient-derived glioma cell lines. Drug target engagement studies identified an autophagy induction protein, UNC-51 like kinase 1 (ULK1), as the main target of VMY-BC-1, in which VMY-BC-1 covalently bound to the protein’s active pocket and increased ULK1 phosphorylation.ULK1 is a component of the ULK1 complex (ULK1-ATG13-FIP200) that is essential for inducing autophagy, a lysosome-dependent mechanism of intracellular degradation for maintaining cellular homeostasis. Additionally, our molecule cross talks to the apoptotic and DNA damage pathways, which could potentially overcome treatment resistance.VMY-BC-1 is orally bioavailable, brain penetrant, and inhibits cell invasion and tumor growth in GBM flank models, making this small molecule an ideal candidate for further development. We hypothesize that activating ULK1-modulated autophagy will be a therapeutic strategy for GBM growth inhibition

DDIS-37. SMALL MOLECULE AUTOPHAGY ACTIVATORS IN GROWTH INHIBITION OF GLIOBLASTOMA