EGFR and non-small cell lung carcinoma: The results revealed a higher percentage of c-MET expression in specimens with high expression of PD-L1; the coefficient of correlation between PD-L1 and c-MET was 0.591 (p < 0.05, Fig. 1d), indicating a positive correlation between PD-L1 and c-MET in EGFR-TKI resistant NSCLC.