GC	Gastric cancer
FOLFOX	Fluorouracil and oxaliplatin chemotherapy regimen
EMT	Epithelial–mesenchymal transition
CSCs	Cancer stem cells
MDR	Drug efflux mediated by multi-drug resistance
RT-qPCR	Real-time quantitative PCR
ABC	ATP-binding cassette transporter
OS	Overall survival
TCGA	The Cancer Genome Atlas
MET	Mesenchymal–epithelial transition