CD274 and non-small cell lung carcinoma: Pivotal to this analysis was the usage of the Merck KGaA anti-PD-L1 clone MKP1A07310, which is the analytical Ab for the evaluation of Avelumab [5], with same specificity and higher sensitivity than Dako anti-PD-L1 clone 22C3 as shown in a NSCLC PD-L1 IHC assay comparison study [14].