Higher PD-L1 expression has been associated with squamous cell carcinoma compared with other histological subtypes40, and lower survival has been documented in adenocarcinoma patients with high (\documentclass[12pt]{minimal}\usepackage{amsmath}\usepackage{wasysym}\usepackage{amsfonts}\usepackage{amssymb}\usepackage{amsbsy}\usepackage{mathrsfs}\usepackage{upgreek}\setlength{\oddsidemargin}{-69pt}\begin{document}$$\ge$$\end{document}≥ 50% PD-L1) compared with lower expression. This evidence concerns the gene CD274 and squamous cell carcinoma.