Zhang et al. found that PPI inhibited TGF-β1-induced invasiveness of gastric cancer SGC790 cells and upregulated E-cadherin expression in them; PPI could also partially inhibit the expression of the CIP2A/PP2A/AKT pathway, which inhibited the invasive deterioration process of gastric cancer cells [48]. The gene discussed is PTPA; the disease is gastric cancer.