CTBP2 and gastric cancer: As a new type of specific peptide, GMBP1 can specifically bind to the GRP78 receptor overexpressed on the surface of MDR gastric cancer cells [5] and significantly downregulate the levels of eukaryotic translation initiation factor 4E (EIF4E) and C-terminal binding protein 2 (CTBP2), thereby regulating the MDR phenotype of gastric cancer [6], which has been preliminarily proven to have a good ability to detect MDR gastric cancer [7].