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Subgroup analyses for overall and relapse-free survival. HR, hazard ratio; 95% CI, 95% confidence interval; SqCC, squamous cell carcinoma; Non-SqCC, non-squamous cell carcinoma; ECOG PS, Eastern Cooperative Oncology Group performance status; Group 1 CD8-positive/PD-L1-negative, Group 2 CD8/PD-L1: positive/positive, negative/negative, or negative/positive
