CD274 and lung carcinoma: First, there was a trend towards a higher expression of PD-L1 and MHC-I in lung cancer cell lines sensitive to erlotinib (EC50 <8) compared to those resistant to erlotinib (EC50 ≥8), but it was not statistically significant likely due to the heterogeneity of lung cancer cell lines and small number of lung cancer cell lines tested (Figs 2B and 4B).