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The correlation between five-year OS and PD-L1 expression. The positive expression of the clone SP142 at the 5% cut-off value was correlated with a worse prognosis (log-rank test). “n” represented the numbers of patients displaying staining less than or equal to 5% cut-off value and those displaying staining greater than the 5% cut-off value. OS, overall survival; PD-L1, programmed death ligand 1
