Table 2. The discrepant PD-L1 expression in the histology and matched cell block of the same biopsy sample.

PD-L1 status	Cell blocks			Total (n=54)	Kappa value	P value
	TPS <1%	TPS 1–49%	TPS ≥50%
Biopsy
TPS <1%	30	2	0	32	0.804	<0.001
TPS 1–49%	1	5	2	8
TPS ≥50%	0	1	13	14
Total	31	8	15	54

PD-L1, programmed cell death ligand-1; TPS, tumour proportion score.