In addition, we found that CNV-Del of genes such as CDKN2A, AXIN1, ACVR1, PTPRD and ATM only appeared in the WCH-HBV-HCC group, while CNV-Del of genes such as FGFR2, STK11, TCF3, and KMT5A were only shown in the TCGA-HBV-HCC group. This evidence concerns the gene ATM and hepatocellular carcinoma.