SNAI2 and infection: We analyzed the expression of EMT-related genes in MDA-MD-231 cells after infection with adenoviruses expressing miR-151 (Ad-miR-151) and found that the gene expression of E-cadherin was significantly increased, whereas the gene expression levels of β-catenin, slug, N-cadherin, snail and vimentin were not significantly different when compared with that of the control (Ad-GFP) (Fig 6A).