The association of clinicopathologic features and peripheral blood parameters with high PD-L1 expression in non-small cell lung cancer.

Introduction Programmed death ligand 1 (PD-L1) is a marker that widely used for prediction of response to immunotherapy. Dynamic alteration of PD-L1 expression are the major problems for reflection of the actual status of the PD-L1. So, we aimed to investigate the factors that may be associated with PD-L1 expression in lung cancer. Materials and Methods The patients diagnosed with non-small cell lung cancer were enrolled, retrospectively. The patients were stratified according to PD-L1 expression level as ≥ 50% and < 50%. Result Totally, 217 patients were enrolled. The clinicopathologic features were similar between two groups, except the amount of cigarette consumption. Neutrophil-lymphocyte ratio, platelet-lymphocyte ratio, and systemic immune-inflammmotry index were found significantly lower in PD-L1 ≥ 50% (p< 0.001, p= 0.006 and p= 0.003, respectively) and also negatively correlated with PD-L1 level (rho= -0.255, p< 0.001; rho= -0.17, p= 0.013; rho= - 0.185, p= 0.006, respectively). Conclusions According to the results of our study, peripheral blood parameters can be used to the prediction of the high PD-L1 expression and can be used for reflection of current PD-L1 expression.