Recently it is found that the expression of miR-30a in cisplatin-sensitive of gastric cancer cells is higher than that in cisplatin-resistant cells; and compared with cisplatin-sensitive of gastric cancer cells, the expressions of Snail, Slug, and Vimentin are higher, but with lower expression of E-cadherin in the cisplatin-resistant cells, which implies that EMT is associated with drug resistance in gastric cancer cells [31, 67]. This evidence concerns the gene SNAI2 and gastric cancer.