Table 2. Percentage of cases with various PD-L1 expression on tumor cells visualized by immunohistochemistry method, using different clones of monoclonal antibodies against PD-L1 molecule.

Monoclonal antibody clone used for slide staining	<1 % TPS	≥1 % TPS	<5% TPS	≥5% TPS	<50% TPS	≥50% TPS
22C3, n(%)	13 of 48 (27.1)	35 of 48 (72.9)	16 of 48 (33.3)	32 of 48 (66.7)	26 of 48 (54.2)	22 of 48 (45.8)
SP 142, n(%)	19 of 48 (39.6)	29 of 48 (60.4)	29 of 48 (60.4)	19 of 48 (39.6)	37 of 48 (77.1)	11 of 48 (22.9)
Chi-square:	1.688		7.069		5.587
p-value:	0.1939		0.0078		0.018