Positive expression of PD-L1 was observed in 20 cases (20/51, 39.2%), including two cases (2/51, 3.9%) with expression exclusively on tumor cells, nine cases (9/51, 17.6%) with expression exclusively on immune cells, and nine cases (9/51, 17.6%) with expression on both tumor cells and immune cells. This evidence concerns the gene CD274 and neoplasm.