Table 3.

Studies comparing different PD-L1 IHC assays

	# and types of tested tumors	SP142	SP263	28–8	22C3	E1L3N	Ref
Hirsch et al.	39 NSCLC	-	+	+	+	NE	26
Karim et al.	29 NSCLC	+	NE	+	+		27
Scognamiglio et Chen	96 HNSCC	+	+++	NE	NE	+	21
Rimm et al.	90 NSCLC	-	NE	+	+	NE	28

Abbreviations: #, number; HNSCC, head and neck squamous cell carcinoma; NE, not evaluated; NSCLC, non–small-cell lung cancer.

SP142 (Spring Bioscience), SP263 (Ventana), 28–8 (Dako), 22C3 (Dako) and E1L3N (Cell Signaling)