Meanwhile, transfection of sh‐CDK9 (Fig. 6C and D) in HCC cells also markedly reduced the expression of CDK9 at mRNA (Bell7402, P = 0.0235; HepG2 P = 0.0037) and protein levels (Bell7402, P = 0.0273; HepG2, P = 0.0013). This evidence concerns the gene CDK9 and hepatocellular carcinoma.