Fig. 2From: Identification of four key prognostic genes and three potential drugs in human papillomavirus negative head and neck squamous cell carcinomaGO and KEGG enrichment analysis, PPI network construction, module analysis and hub gene identification. a Enriched biological process (BP) pathways. b Enriched cellular component (CC), molecular function (MF) and KEGG pathways. c PPI network of the 47 DEGs, constructed via the STRING database. d–e Top two most significant modules screened with the Cytoscape plugin MCODE. f Eleven hub genes identified with the Cytoscape plugin cytoHubbaBack to article page