Moreover, western blot studies of A549 and H1299 cells showed that GSTP1‐OE inhibited the expression of the epithelial cell adhesion marker E‐cadherin, and increased that of the mesenchymal marker VIMENTIN compared to control (Figure S2F, Supporting Information), indicating GSTP1 facilitated cancer metastasis through regulating epithelial–mesenchymal transition (EMT). This evidence concerns the gene GSTP1 and cancer.