Table 1. Anti PD-1/PD-L1 antibodies and companion/complementary diagnostic PD-L1 IHC assays.

Antibody	Pembrolizumab	Nivolumab	Atezolizumab	Durvalumab	Avelumab
Target	PD-1	PD-1	PD-L1	PD-L1	PD-L1
Clone used for assay	22C3	28-8	SP142	SP263	73-10
Company	Dako	Dako	Ventana	Ventana	Dako

PD-1, programmed cell death 1; PD-L1, programmed cell death ligand 1.