First, we only assessed CD8+ TILs in the evaluation of the immune microenvironment of endometrial cancer, To clarify the immune microenvironment, it is necessary to assess the distribution patterns of immune cells other than CD8+ T-cells and the interaction of each immune cell and also necessary to assess the expression of immune evasion molecules such as PD-L1 expression on tumor cells, which is a future task. This evidence concerns the gene CD8A and endometrial cancer.