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Correlation between PD-L1 status and Overall Survival (OS). (a) Using 5% PD-L1 tumor cells expression cut-off to define negative/positive status, for patient >5% the median OS is 11 months, meanwhile for patients <5% the median OS is 12 months (p-value 0.79). (b) Using 1% PD-L1 tumor cells expression cut-off to define negative/positive status, for patient >1% the median OS is 12 months, meanwhile for patients <1% the median OS is 13 months (p-value 0.56).
