CD274 and non-small cell lung carcinoma: To further confirm the influence of HGF on PD-L1 in EGFR-TKI resistant NSCLC, we added HGF (50 ng/L) to the culture medium of EGFR mutant NSCLC cells (PC-9, HCC827) to establish the HGF-mediated EGFR-TKI resistant NSCLC cell models.