TGFB2 and esophageal squamous cell carcinoma: In total, 57 candidate compounds, which have not been reported to exert any effect in cancer invasion, was taken and their effect on TGFβ2 expression and cell invasion was determined by using Western blot and Boyden chamber assay, respectively, in ESCC cells (Figure 2A; Figure S2A,B and Table S2, Supporting Information).