SKP2 and hepatocellular carcinoma: Simvastatin exerted its chemotherapeutic effect in HCC by inducing G0/G1 cell cycle arrest via a novel mechanism through which statins upregulate p21 and p27 by activating the AMPK pathway and inhibiting the signal transducer and activator of transcription factor 3 (STAT3)-Skp2 pathway, respectively13.