This is mainly through down regulating the expression of E-cadherin, keratin, mucin, ZO-1 (tight junction protein); up regulating the expression of vimentin, alpha-smooth muscle actin (α-SMA), FN fibronectin, MMPs (degradation matrix), N-cadherin, snail, slug, twist, Rho, TGF-β, FGF, type I collagen, and type II collagen to achieve the invasion, metastasis, and anti-apoptosis of EMT characteristic tumor. The gene discussed is SNAI1; the disease is neoplasm.