Table 3.

PD-L1 IHC scoring according to the SP142-IHC assay scoring algorithm.

		SP142-IHC assay				Total	Kappa value P value	McNemar-Bowker
		0	1+	2+	3+
22C3-IHC assay	0	40	5	0	0	45	0.481P < 0.001	P < 0.001
	1+	21	15	0	0	36
	2+	9	11	5	1	26
	3+	4	6	9	9	28
	Total	74	37	14	10	135

0 indicates negative, 1+ weakly positive, 2+ moderately positive, and 3+ strongly positive PD-L1 expression.