The PD-1 and PD-L1 protein expressions in tumor cells by immunohistochemistry (IHC) assay were 38 cases with PD-1 low expression, 66 cases with PD-1 high expression, 61 cases with PD-L1 low expression, and 43 cases with PD-L1 high expression, respectively. Here, PDCD1 is linked to neoplasm.