Overexpression of PD-L1 is observed in melanoma (Thierauf et al., 2015), pancreatic cancer (Zhuan-Sun et al., 2017), oral cancer (Goncalves et al., 2017), and colorectal cancer (Droeser et al., 2013; Thierauf et al., 2015). The gene discussed is CD274; the disease is lip and oral cavity carcinoma.