4CPS-233 PD-l1 expression and histological type as predictors of response in metastasic non-small-cell lung cancer (NSCLC) patients treated with pembrolizumab in first-line
4CPS-233 PD-l1 expression and histological type as predictors of response in metastasic non-small-cell lung cancer (NSCLC) patients treated with pembrolizumab in first-line