AJCC	American Joint Committee on Cancer
CPS	combined positive score
DFS	disease-free survival
EBV	Epstein–Barr virus
GC	gastric cancer
HP	Helicobacter pylori
IHC	immunohistochemical
MSI	microsatellite instability
MSI-H	microsatellite instability—high
MSI-L/S	microsatellite instability—low/stable
OS	overall survival
PCR	polymerase chain reaction
PD-L1	programmed death-ligand 1
UICC	Union for International Cancer Control
SRC	Signet-ring cell
TNM	tumor, node, metastasis
WHO	World Health Organization