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Among clinical analyses, elevated neutrophil-lymphocyte ratio has been correlated with poor outcomes of glioblastoma patients independent of other prognostic factors. Additionally, our flow cytometric studies of primary patient samples found neutrophil percentage to be significantly higher in higher-grade glioma versus lower-grade glioma. Tumor-associated neutrophils (TANs) comprise less than 2% of the glioblastoma microenvironment. While TANs were initially considered passive bystanders due to their short-lived nature, investigation of TANs in other cancers revealed distinct pro-tumoral roles. Therefore, we transcriptomically characterized glioblastoma TANs and defined their oncologic effects. Transcriptomic analysis of patient-matched TANs versus peripheral blood neutrophils revealed that functionally quiescent circulating neutrophils infiltrate IDH1-wild type glioblastoma via leukotriene B4 chemoattraction, where tumor cells morphologically and transcriptomically activate them to become TANs. Single-cell RNA-sequencing of patient-matched TANs and peripheral blood neutrophils revealed a subset of tumor-activated neutrophils which adopt a pro-tumoral secretory phenotype, marked by activation of the IL-17 signaling pathway and high osteopontin production. Using immunofluorescence stains of primary patient glioblastoma sections, we demonstrated that activated, myeloperoxidase-positive TANs reside in the perivascular niche of glioblastoma in close proximity to glioblastoma stem-like cells (GSCs) and CD31-positive endothelial cells. Further analysis in culture demonstrated that TAN-secreted osteopontin drives the formation, self-renewal, and proliferation of GSC-containing neurospheres. These results were validated using a syngeneic stem cell-derived IDH1-wild type murine glioblastoma model in vivo. Thus, while TANs are rare in glioblastoma, their enrichment in the glioblastoma perivascular niche uniquely positions them to support the GSCs that are crucial to therapeutic resistance of GBM.

TAMI-38. TUMOR-ASSOCIATED NEUTROPHILS IN GLIOBLASTOMA PROMOTE THE PERIVASCULAR GLIOMA STEM-LIKE CELL NICHE VIA OSTEOPONTIN SECRETION