CD274 and non-small cell lung carcinoma: Here we report an extension of previous studies [24, 25] using archival tumor samples from commercially available non-small cell lung cancer cases in which automated image analysis with a customized PD-L1 scoring system was developed, evaluated via correlation with manual pathologist scores, and then used to determine comparability across the four PD-L1 immunohistochemistry assays, based on a more quantitative comparison.