The EMT is an important pathway that affects the migration of cancer cells, the expressions of β-Catenin, Vimentin, MMP9, Slug and ZO-1 in T24 and UMUC3 cells were examined by Western blotting in Fig. 2a, after treatment with 0, 0.75 and 1.5 μM PL for 24 h, β-Catenin, Vimentin, MMP9, Slug had decreased on dependent-concentration, in contrast, ZO-1 had increased. This evidence concerns the gene MMP9 and cancer.