CD274 and hepatocellular carcinoma: Flow cytometry analysis of PD‐L1 expression in each group containing HCC‐827 showed that HCC‐827 cells cocultured with T cells and antihuman CD3 mAb had the highest PD‐L1 expression (MFI 719), which was significantly higher than that of containing T cells only group (MFI 581) and containing anti‐CD3 mAb only group (MFI 474) (Fig 5(b)).