PDCD1LG2 and non-small cell lung carcinoma: Based on reports suggesting a predictive role of PD-L1 and PD-L2 expression on T cells in non-small cell lung cancer (NSCLC) [37], we also analyzed the expression of PD-L1 and PD-L2 on T cell in both blood and tumors in addition to tumor cells of patients before and at the end of chemoradiation.