CST2 and hepatocellular carcinoma: The results showed that the mRNA expressions of seven genes in both TCGA and ICGC sets were significantly different between HCC samples and non-tumor samples, including six genes (CST2, EPHB6, MAGEA6, SEMA6A, SLC2A5, and SLCO2A1), and were highly expressed in HCC samples and one gene (PDZD4) expressed low in HCC samples (Figure 6).