In addition, the results of the qRT-PCR analysis of HAO2 expression levels in normal liver epithelial cells THLE-2 and 4 HCC cell lines (BEL-7405, Huh 7, SNU-387, Hep3B), shown in Figure 1(c), revealed that HAO2 was underexpressed in HCC cell lines to varying degrees. Here, HAO2 is linked to hepatocellular carcinoma.