CD274 and skin squamous cell carcinoma: The following tumor tissue samples stained using the SP263 assay demonstrated PD-L1 immunostaining of tumor cells: squamous cell carcinoma of the skin, infiltrating ductal carcinoma of the breast, cholangiocarcinoma of the liver, Hodgkin lymphoma, squamous cell carcinoma of the lung, gastric adenocarcinoma, diffuse large B-cell lymphoma (in stomach), squamous cell carcinoma of the uterine cervix, endometrial adenocarcinoma, and thyroid papillary carcinoma.