In another retrospective analysis, a stronger correlation was observed between OS and PD-L1 expression in a group of lung squamous cell carcinomas (SqCLC).(32) The correlation of PD-L1 expression and adjuvant therapy, increased tumor size (pT2-4), and positive lymph node status (pN1-3) has also been suggested.(32). This evidence concerns the gene CD274 and squamous cell lung carcinoma.