We first compared the expression differences of MAPT, WDR62, PLK1, CDCA8 and TOP2A in normal hepatocyte tissues and HCC tissues by TCGA database, and the results showed that the expression levels of MAPT, WDR62, PLK1, CDCA8 and TOP2A were significantly higher in tumour cells than in normal tissues (Figure S1). This evidence concerns the gene PLK1 and hepatocellular carcinoma.