The initial screen for the expression of PD-L1 in different lung adenocarcinoma cell lines with wildtype KRAS (H1975, H1650 and H1299) and cell lines harboring KRAS mutations (A549, H460 and A427) showed the H460 and H1975 had the highest PD-L1 expression. The gene discussed is CD274; the disease is lung adenocarcinoma.