Table 1. Mean value and ICC of PD-L1 scores using four assays.

Assay	Immune cells		Tumor cells
	PD-L1 score [%, mean (range*)]	Reader ICC (95% CI)	PD-L1 score [%, mean (range*)]	Reader ICC (95% CI)
SP142	6.21 (0.1–27.7)	0.602 (0.489–0.722)	3.22 (0–47.0)	0.684 (0.583–0.786)
SP263	11.43 (0.1–33.8)	0.584 (0.464–0.710)	9.07 (0–84.5)	0.957 (0.937–0.974)
22C3	12.90 (0.1–47.0)	0.649 (0.530–0.764)	8.20 (0–80.5)	0.951 (0.927–0.970)
E1L3N	10.65 (0.1–37.0)	0.627 (0.511–0.744)	7.17 (0–74.0)	0.898 (0.853–0.936)

PD-L1 = programmed death ligand 1; ICC = intraclass correlation coefficient; CI = confidence interval.

*Range of mean scores.