GC	Gastric cancer
TME	Tumor microenvironment
ST	Spatial transcriptomics
NGS	Next-Generation Sequencing
FFPE	Formalin-fixed paraffin-embedded
DBiT-seq	Deterministic Barcoding in Tissue for spatial omics sequencing
ISH	In situ hybridization
IMC	Imaging Mass Cytometry
MIBI-TOF	Multiplexed Ion Beam Imaging
DSP	Digital Spatial Profiling
ROI	Region of Interest
CNV	Copy number variation
MSI	Mass spectrometry imaging
MALDI-MSI	Matrix-assisted laser desorption/ionization mass spectrometry imaging
DESI-MSI	Desorption electrospray ionization–mass spectrometry imaging
SIMS	Secondary ion mass spectrometry
TCGA	The Cancer Genome Atlas
ACRG	Asian Cancer Research Group
EBV	Epstein–Barr virus
MSI	Microsatellite Instability
CIN	Chromosomal Instability
GS	Genomically Stable
ITH	Intra-tumoral heterogeneity
MSC	Metabolic signature cluster
MP	Meta-program
PCC	Poorly cohesive carcinoma
CSC	Cancer stem cell
CAF	Cancer-associated fibroblast
DGC	Diffuse Gastric Cancer
SRC	Signet ring cell
PDC	Poorly differentiated cell
GSRC	Gastric signet ring cell carcinoma
ICI	Immune checkpoint inhibitor
CPS	Combined positive score
TMB-H	High tumor mutational burden
PMN-MDSC	Polymorphonuclear myeloid-derived suppressor cell
CTL	Cytotoxic T lymphocyte
ICEP	Immune checkpoint expression pattern
ERAD	Endoplasmic reticulum-associated degradation
T-DXd	Trastuzumab deruxtecan
PMC_P	Precancerous metastatic niche
GCPM	Gastric cancer peritoneal metastasis
THSD4	Thrombospondin type 1 domain-containing protein 4
INT/S	Intestinal with stem-like features
TLS	Tertiary lymphoid structure
iTLS	Intra-tumoral tertiary lymphoid structure
pTLS	Peritumoral tertiary lymphoid structure
HEV	High endothelial venule
GCY	Young gastric cancer
TCR	Tumor core region
CAT	Cancer-adjacent tissues
SARIFA	Stroma AReactive Invasion Front Areas