NGF and glioblastoma: Several signal transduction pathways with established or suspected roles in GBM pathogenesis have been identified by independent GSEA of multiple databases: Notch Signaling Pathway (NCI-Nature 2016; WikiPathways 2021 Human; KEGG 2021 Human database; BioPlanet 2019 database; Reactome 2016 database); Hedgehog Signaling Pathway (NCI-Nature 2016; WikiPathways 2021 Human; KEGG 2021 Human database; BioPlanet 2019 database; Panther 2016 database); NGF Signaling Pathway (Reactome 2016 database; BioPlanet 2019 database); TGF-beta Signaling Pathway (WikiPathways 2021 Human; BioPlanet 2019).