Expression of PD-L1 in triple-negative breast cancer based on different immunohistochemical antibodies

Table 1 Kappa value for inter-reader reproducibility of PD-L1 monoclonal antibodies

Reader	PD-L1 (28-8)					PD-L1 (E1L3N)					PD-L1 (SP142)
	Tumor cell				Immune cell	Tumor cell				Immune cell	Tumor cell				Immune cell
	1 %	5 %	10 %	50 %	Immune cell	1 %	5 %	10 %	50 %	Immune cell	1 %	5 %	10 %	50 %	Immune cell
#1 to #2	1.000	0.913	0.770	0.838	0.903	1.000	0.943	0.876	0.887	0.914	1.000	0.871	0.889	1.000	0.928
#1 to #3	1.000	0.958	0.923	0.838	0.894	1.000	0.981	0.820	0.887	0.888	1.000	0.976	0.924	1.000	0.858
#2 to #3	1.000	0.913	0.794	0.628	0.798	1.000	0.923	0.670	1.000	0.870	0.977	0.842	0.803	1.000	0.788

ISSN: 1479-5876