ACC	adenoid cystic carcinoma
CAP	cyclophosphamide-doxorubicin-cisplatin
CR	complete response
DFI	disease-free interval
DFS	disease-free survival
DM	distant metastasis
HNC	head and neck cancer
HNSCC	head and neck squamous cell carcinoma
ICI	immune checkpoint inhibitor
OS	overall survival
PD-1	programmed death-1 receptor
PD-L	programmed death ligand
PFS	progression-free survival
PM	pulmonary metastasectomy
PR	partial response
R/M	recurrent/metastatic
RT	radiation therapy
SBRT	stereotactic body radiation therapy
SCC	squamous cell carcinoma
SD	stable disease
TKI	tyrosine kinase inhibitor
VEGFR	vascular endothelial growth factor receptor