AJCC	American Joint Committee on Cancer
CT	computed tomography
CPS	combined positive score
DFS	Disease-free survival
EBER	EBV-encoded small RNAs
EBV	Epstein–Barr virus
GC	Gastric cancer
HP	Helicobacter pylori
IHC	Immunohistochemical
ISH	In situ hybridization
MSI	Microsatellite instability
MSI-H	Microsatellite instability-high
MSS	Microsatellite stable
NGS	Next-generation sequencing
OS	Overall survival
PCR	Polymerase chain reaction
PD-L1	programmed death-ligand 1
TCGA	The Cancer Genome Atlas
TNM	tumor, node, metastasis
UICC	Union for International Cancer Control