A phase I study of RNA-lipid particle vaccines for newly-diagnosed glioblastoma, IND19304 08/21/2020

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Project Summary: Despite standard of care with maximal surgical resection, external beam radiotherapy, and chemotherapy, patients with glioblastoma (GBM) live little more than 18 months after diagnosis; these outcomes necessitate development of new targeted therapies. To address this gap, our group developed a novel vaccine formulation that can unlock anti-tumor immunity within hours. By layering tumor mRNA into a multi-lamellar nano-lipid formulation (for systemic administration), we can make tumor antigens appear like a systemic viral infection. Our multi-lamellar design delivers increased antigenic load (per particle) triggering potent innate activation which then facilitates adaptive effector responses. RNA-lipid nanoparticles (RNA-LPs) activate systemic/intratumoral dendritic cells (DCs), upregulate critical innate gene signatures in the glioma microenvironment, and induce glioma-specific T cell immunity. In murine tumor models resistant to immune checkpoint inhibitors, RNA-LPs induce robust anti-tumor efficacy with long-term survivor benefits. We have previously demonstrated safety of RNA-LPs in acute/chronic murine GLP toxicity studies and launched a large animal canine glioma trial (IACUC#201609430). Our canine trial demonstrated that RNA-LP administration is feasible, safe and immunologically active with improvement in overall survival in pet dogs with terminal gliomas (compared with historical controls). We have since received FDA-IND approval (BB-IND#19304, Sayour) for first- in-human studies (NCT04573140) in patients with GBM. The purpose of this study is to assess the safety, maximum tolerated dose (MTD), and immunogenicity of RNA-LPs vaccines in newly-diagnosed adult GBM patients. We hypothesize that RNA-LPs will mediate systemic immune reprogramming of GBM unlocking immunotherapeutic activity. Our SPECIFIC AIMS are: 1. Conduct phase I study evaluating safety, MTD and immunogenicity of RNA-LPs against GBM. a. Characterize systemic immune response in patients prior to receiving RNA-LPs and effect change following vaccination. i. Identify immunologic phenotype of myeloid and lymphocyte subsets (naïve, effector, memory, regulatory) and NK cells in patients with GBM at diagnosis and throughout therapy. ii. Elucidate changes in cytokine profile and pathogen-recognition receptor (PRR) activation status in patients with GBM during/after RNA-LP vaccines. iii. Identify potential tumor specific antigens as vaccine candidates through whole exome sequencing, RNA-seq, and neoantigen prediction analysis. b. Establish memory recall T cell immunity in vaccinated patients c. Determine if magnitude and persistence of anti-tumor innate and adaptive immunity correlates with clinical outcome.