Results showed that the mRNA expression of PD-L1 (CD274) was higher in KRAS-mutant lung cancer cells than in KRAS wide-type (WT) cells (Figure 2A), and Western blot analysis showed a higher tendency of PD-L1 protein level in KRAS mutant H441 and H460 cells (Figure 2B). Here, CD274 is linked to lung carcinoma.