CD274 and hepatocellular carcinoma: Compared to fluorescence staining directly, PD‐L1 expression by indirect fluorescence staining was higher, including PLA‐801D (4.02%), A549 (11.1%), CALU‐1 (9.17%), HCC‐827 (71.80%), NCI‐H2009 (98.90%) (Fig 1).