CD274 and neoplasm: Considering PD-L1 expression in tumor cells of conventional histological slides (individual analysis), there was a higher median overall survival for patients with tumors that had positive PD-L1 expression; however this difference was not statistically significant: 98.75 months (95% CI 21.26 to 176.24) versus 41.51 months (95% CI 30.05 to 52.98) with p value = 0.254.