As shown in Figure 2A, PD-L1 expression levels were significantly higher than in adjacent normal tissues in the following cancers: cervical squamous cell carcinoma and endocervical adenocarcinoma (CESC), cholangiocarcinoma (CHOL), esophageal carcinoma (ESCA), head and neck squamous cell carcinoma (HNSC), and stomach adenocarcinoma (STAD). This evidence concerns the gene CD274 and cervical squamous cell carcinoma.