Fig. 3

Subgroup analysis based on different scoring systems. a Stratified by the scoring system of PD-L1 with progression-free survival and b Stratified by the scoring system of PD-L1 expression with overall survival. CI, confidence interval; HR, hazard ratio; TPS, tumor proportional score; TC, tumor cells; H score is defined as the percentage of positively stained tumor cells multiplied by the intensity of staining