CD274 and non-small cell lung carcinoma: The PD-L1 IHC 22C3 pharmDx kit is a qualitative IHC assay using monoclonal mouse anti–PD-L1 antibody clone 22C3 intended for use in the detection of PD-L1 protein in FFPE NSCLC tissue specimens using the EnVision FLEX visualization system on the Dako ASL48 platform [10].