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Kaplan–Meier analysis of the disease-free survival and overall survival of patients with advanced oropharyngeal squamous cell carcinoma. (A,B) Programmed death ligand 1 (PD-L1)+ or PD-L1− tumour cells, (C,D) PD-L1+ or PD-L1− immune cells in the stroma, and (E,F) high or low CD8+ tumour-infiltrated lymphocyte density. Significant differences were evaluated using a log-rank test.
