AJCC	American Joint Committee on Cancer
AP-1	Activator protein-1
BDNF	Brain-derived neurotrophic factor
CI	Confidence interval
cN	Clinical nodal
CT	Computed tomography
DNA	Deoxyribonucleic acid
DOI	Depth of invasion
EGFR	Epidermal growth factor receptors
EMT	Epithelial to mesenchymal transition
ENE	Extracapsular nodal extension
ERK	Extracellular-regulated protein kinase
FDA	Food and Drug Administration
FGFR	Fibroblast growth factor receptor
GALR	Galanin receptor
GDNF	Glial cell-derived neurotrophic factor
GFAP	Glial fibrillary acidic protein
GFRalpha1	GDNF family receptor-alpha 1
HPV	Human papilloma virus
HR	Hazard ratio
IMRT	Intensity-modulated radiation therapy
LOH	Loss of heterozygosity
M	Metastasis
MAPK	Mitogen-activated protein kinase
MMP	Matrix metalloproteinase
MR	Magnetic resonance
mRNA	Messenger ribonucleic acid
NCAM	Neural cell adhesion molecule
NFATC	Nuclear factor of activated T cells
NGF	Nerve growth factor
OR	Odds ratio
p75NTR	p75 neurotrophin receptors
PD-L1	Programed cell death -ligand 1
pN	Pathological nodal
PNI	Perineural invasion
RET	REarranged during Transfection
SCC	Squamous cell carcinoma
shRNA	Short hairpin ribonucleic acid
T	Tumor
TNF	Tumor necrosis factor
TrkA	Tropomyosin receptor kinase A
TrkB	Tropomyosin receptor kinase B