CD274 and non-small cell lung carcinoma: Ratcliffe et al. studied the concordance between three commercially available PD-L1 IHC assays for NSCLC patients including Ventana SP263 (durvalumab), Dako 22C3 (pembrolizumab), and Dako 28–8 (nivolumab) and found >90% concordance at several levels (1%, 10%, 25%, 50%) of PD-L1 expression [30].