AJCC	American Joint Committee on Cancer
CI	Confidence interval
DNA	Deoxyribonucleic acid
E6/E7	Early genes 6 and 7 of HPV
FISH	Fluorescence in Situ Hybridization
HPV	Human papillomavirus
IHC	Immunohistochemistry
I2	I-squared
LD	Linear dichroism
MD	Moderately differentiated
OPC	Oropharyngeal cancer
OPSCC	Oropharyngeal squamous cell carcinoma
OR	Odds ratio
OS	Overall survival
P16	Cyclin-dependent kinase inhibitor 2A
PD	Poorly differentiated
PECO	Population, exposure, comparison, and outcomes
PRISMA	Preferred Reporting Items for Systematic Reviews and Meta-Analyses
REML	Restricted maximum likelihood
RNA	Ribonucleic acid
ROC	Receiver operating characteristics
SCC	Squamous cell carcinoma
TNM	Tumor, node, and metastasis
VC	Verrucous carcinoma
WD	Well differentiated