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Kaplan–Meier curves for survival based on the expression of CD8/PD-L1 in resectable non-small-cell lung cancer. a Overall survival and b relapse-free survival in the four stratified groups. c Overall survival and d relapse-free survival in the dichotomised groups. Group 1 CD8-positive/PD-L1-negative, Group 2 CD8/PD-L1: positive/positive, negative/negative, or negative/positive
