In addition, analyzing the mRNA and protein levels of PD-L1 in the Cancer Genome Atlas (TCGA) and internal database (Guangdong Lung Cancer Institute; GLCI) revealed lower PD-L1 mRNA and PD-L1 protein expression in the EGFR-mutated NSCLC samples compared with that in the wild-type tumor samples [71]. Here, EGFR is linked to non-small cell lung carcinoma.