The TISCH database including LIHC_GSE125449_aPDL1aCTLA4, LIHC_GSE140228_10X, LIHC_GSE140228_Smartseq2, and LIHC_GSE98638 showed that in HCC, COX2 was mainly expressed in mast cells, mono/macro cells, and dendritic cells (DC) (Figure 3(c)). This evidence concerns the gene PTGS2 and hepatocellular carcinoma.