PNI	perineural invasion
TCGA	the cancer genome atlas
NGS	next-generation sequencing
FFPE	formalin-fixed paraffin-embedded
RSEM	RNA-seq by expectation-maximization
DEGs	differentially expressed genes
PPI	protein–protein interaction
STRING	search tool for the retrieval of interacting genes
MCODE	molecular complex detection
GO	Gene Ontology
KEGG	Kyoto Encyclopedia of Genes and Genomes
WP	WikiPathways
OS	overall survival
DFS	disease-free survival