Human gastric cancer MG7 antigen( MG7-Ag) is a neutral glycolipid tumor associated antigen. It is not expressed or lowly expressed in normal gastric mucosa,but the positive ratio is significantly higher in early gastric cancer,which makes it possible to become a warning antigen for the diagnosis of early gastric cancer. MG7-Ag participates in the process of the development from chronic gastritis to gastric carcinoma,which makes the targeted therapy for MG7-Ag over-expression carcinoma clinically possible. T...