MMP2 and hepatocellular carcinoma: The role of OA in suppressing TGF‐β1‐induced EMT in HCC cells was confirmed by the decreased levels of N‐cadherin, vimentin, MMP2, MMP9, Twist1, and PAI‐1 expression, while the E‐cadherin level was raised upon treating SMMC‐7721 cells with OA.