CD274 and non-small cell lung carcinoma: In the current study we investigated the expression of PD-L1 in NSCLC stage IIIB and IV patients with two clones in the same cell-block the IHC 22C3pharmDx DAKO (Companion diagnostic system Dako, Denmark, EU) and [clone: CAL10 (RTU, CE, IVD), Biocare, CA, USA).