CD274 and squamous cell carcinoma: The median percentages of tumor cell PD-L1 were highest in spindle and squamous cell carcinomas and lowest in carcinoma with mesenchymal differentiation, whereas median intratumoral TIL counts were highest in spindle cell carcinoma and lowest in low grade adenosquamous carcinoma, carcinoma with mesenchymal differentiation and mixed type carcinomas.