LUAD	Lung adenocarcinoma
PTH2R	Parathyroid hormone 2 receptor
OS	Overall survival
SCLC	Small cell cancer
NSCLC	Non-small cell cancer
EGFR	Epidermal growth factor receptor
GPCRs	G protein-coupled receptors
VIPR1	Vasoactive intestinal peptide receptors 1 and 2
VIPR2	Vasoactive intestinal peptide receptors 2
PAC1R/ADCYAP1R1	Pituitary adenylate cyclase-activating peptide receptor
SCTR	Secretin receptor
GHRHR	Growth hormone-releasing factor receptor
GCGR	Glucagon receptor
GLP1R	Glucagon-like peptide 1 receptor
GLP2R	Glucagon-like peptide 2 receptor
GIPR	Gastric inhibitory peptide receptor
PTH1R	Parathyroid hormone receptors 1
CTR/CALCR	Calcitonin receptor
CALCRL	Calcitonin receptor-like receptor
CRF1R/CRHR1	Corticotropin-releasing factor 1 receptor
CRF2R/CRHR2	Corticotropin-releasing factor 2 receptor
TCGA	The Cancer Genome Atlas
KEGG	Kyoto Encyclopedia of Genes and Genomes
GO	Gene Ontology
DAVID	Database for Annotation, Visualization and Integrated Discovery
ATCC	American Type Culture Collection
OD	Optical density
PBS	Phosphate buffer solution
IC50	A half-maximal inhibition
DEGs	Differentially expressed genes