The distribution of patients by sex (χ2 = 0; p = 1), grade (χ2 = 3.83; p = 0.147), histological type (χ2 = 0.612; p = 0.434), the presence of atelectasis/pneumonitis (χ2 = 2.65; p = 0.104), the presence of lympho-vascular invasion (χ2 = 1.42; p = 0.233), and disease stage (χ2 = 2.3; p = 0.320) did not differ statistically according to negative or positive PD-L1 expression. This evidence concerns the gene CD274 and pneumonitis.