A positive relationship was found between γH2AX and PD-L1 expression in lung adenocarcinomas (p = 0.004, Pearson r = 0.3964), whereas no statistical significance was found in lung squamous cell carcinomas (p = 0.1358, Pearson r = 0.216) (Figure 5). This evidence concerns the gene CD274 and squamous cell lung carcinoma.