OPMDs	Oral potentially malignant disorders
OSCC	Oral squamous cell carcinoma
Cf-DNA	Cell-free DNA
Ct-DNA	Circulating tumor DNA
OLK	Oral leukoplakia
OLP	Oral lichen planus
OSF	Oral submucous fibrosis
CSF	Cerebrospinal fluid
HNSCC	Head and Neck Squamous Cell Carcinoma
ddPCR	Droplet digital polymerase chain reaction
WES	Whole-exome sequencing
MRD	Minimal residual disease
dPCR	Digital PCR
TME	Tumor microenvironment
MS	Mass spectrometry
iTRAQ	Isobaric tags for relative and absolute quantitation
LC-MRM/MS	Liquid Chromatography Multiple-Reaction-Monitoring Mass Spectrometry
MALDI-MSI	Matrix-assisted laser desorption/ionization mass spectrometry imaging
SELDI-TOF/MS	Surface-enhanced laser desorption/ionization-time-of-flight/mass spectrometry
CFH	Complement factor H
FGA	Fibrinogen alpha chain
SERPINA1	Alpha-1-antitrypsin
GC-MS	Gas chromatography–mass spectrometry
UHPLC-MS/MS	Ultra-high-performance liquid chromatography–tandem mass spectrometry
CE-MS	Capillary electrophoresis-mass spectrometry
NMR	Nuclear magnetic resonance