Table 1.

Classification of PD-L1 Protein Expression Level in LUSC

PD-L1 Expression Status	PD-L1 Expression Levels	Staining Type
No PD-L1 Expression	TPS<1%	Tumor cells showing partial or complete cell membrane staining (≥ 1 +) accounted for less than 1% of viable tumor cells.
PD-L1 Expression (Low to medium)	1%≤TPS≤49%	Tumor cells with partial or complete cell membrane staining (≥ 1 +) accounted for 1–49% of viable tumor cells.
High PD-L1 Expression	TPS≥50%	Tumor cells with partial or complete cell membrane staining (≥ 1 +) accounted for more than 50% of viable tumor cells.