AJCC-8	American Joint Committee on Cancer, 8th edition
AUC	Area Under the Curve (ROC analysis)
BOT	Base of Tongue
CI	Confidence Interval
cN0	Clinically Node-Negative
cT1–T2	Clinical Tumor Stage 1 to 2
CT	Computed Tomography
DSS	Disease-Specific Survival
DFS	Disease-Free Survival
DOI	Depth of Invasion
ECS	Extranodal (Extracapsular) Spread
END	Elective Neck Dissection
FOM	Floor of Mouth
GRADE	Grading of Recommendations, Assessment, Development and Evaluation
HR	Hazard Ratio
LVI	Lymphovascular Invasion
MRI	Magnetic Resonance Imaging
NNT	Number Needed to Treat
NR	Not Reported
OCSCC	Oral Cavity Squamous Cell Carcinoma
OS	Overall Survival
pN	Pathologic Nodal Category
pT	Pathologic Tumor Category
PECOS	Population, Exposure, Comparator, Outcomes, Study design
PNI	Perineural Invasion
PRISMA	Preferred Reporting Items for Systematic Reviews and Meta-Analyses
RCT	Randomized Controlled Trial
RoB 2.0	Cochrane Risk of Bias 2.0 Tool
ROBINS-I	Risk Of Bias In Non-randomized Studies of Interventions
ROC	Receiver Operating Characteristic
RRFS	Regional Recurrence-Free Survival
SEER	Surveillance, Epidemiology, and End Results (U.S. registry)
SLNB	Sentinel Lymph Node Biopsy
US-DOI	Ultrasound-measured Depth of Invasion
y/mo	Years/Months