GC	Gastric Cancer
MRD	Molecular Residual Disease/Minimal Residual Disease
ctDNA	Circulating Tumor DNA
cfDNA	Cell-free DNA
CTCs	Circulating Tumor Cells
EVs	Extracellular Vesicles
cfRNA	Cell-free RNA
VAF	Variant Allele Frequency
SNV	Single Nucleotide Variation
CNA	Copy Number Alteration
TMB	Tumor Mutational Burden
EMT	Epithelial–Mesenchymal Transition
MMT	Mesothelial–Mesenchymal Transition
CHIP	Clonal Hematopoiesis of Indeterminate Potential
WBC	White Blood Cell
FFPE	Formalin-Fixed Paraffin-Embedded
PLF	Peritoneal Lavage Fluid
MDSCs	Myeloid-Derived Suppressor Cells
PD-L1	Programmed Death-Ligand 1
HER2	Human Epidermal Growth Factor Receptor 2
GEJ	Gastroesophageal Junction
CNS	Central Nervous System
CSF	Cerebrospinal Fluid
LM	Leptomeningeal Metastasis
NGS	Next-Generation Sequencing
ddPCR	Digital Droplet PCR
WES	Whole-Exome Sequencing
WGS	Whole-Genome Sequencing
CAPP-Seq	Cancer Personalized Profiling by Deep Sequencing
SERS	Surface-Enhanced Raman Spectroscopy
MCTA-Seq	Methylated CpG Tandems Amplification and Sequencing
PANDORA-seq	RNA Sequencing Platform
SE-iFISH	Subtraction Enrichment and Immunostaining-Fluorescence In Situ Hybridization
EpCAM	Epithelial Cell Adhesion Molecule
CEA	Carcinoembryonic Antigen
CA19-9	Carbohydrate Antigen 19-9
CA72-4	Carbohydrate Antigen 72-4
CA125	Carbohydrate Antigen 125
miRNA/miR	MicroRNA
lncRNA	Long Non-Coding RNA
circRNA	Circular RNA
piRNA	PIWI-Interacting RNA
tsRNA	Transfer RNA-Derived Small RNA
snoRNA	Small Nucleolar RNA
HR	Hazard Ratio
OS	Overall Survival
DFS	Disease-Free Survival
PFS	Progression-Free Survival
ORR	Objective Response Rate
AUC	Area Under the Curve
AUROC	Area Under the Receiver Operating Characteristic Curve
FDR	False Discovery Rate
R0	Complete Resection (no residual tumor)
PICO	Population, Intervention, Comparator, Outcome