Figure 1.

Protein level expression of programmed cell death ligand 1 (PD‐L1) was high in oral squamous cell carcinoma (OSCC). A, Expression of PD‐L1 in OSCC (HN4 and HN30) cell lines was high compared with that in normal human oral keratinocyte (HOK) cells. B, mRNA expression of PD‐L1 between OSCC (HN4 and HN30) and oral normal cell line (HOK) showed no significant difference. C, mRNA expression of PD‐L1 from Oncomine database was not different between patients with OCSS and normal individuals. D, Immunohistochemistry (IHC) showed expression of PD‐L1 in tumor and paracarcinoma tissue. E, IHC data from The Human Protein Atlas (THPA) database showed PD‐L1 was highly expressed in OSCC samples