We also confirmed the PD-L1 expressions at the mRNA and protein levels in HEC-151 cells, the results of which were in line with previous findings which showed that PD-L1 is highly expressed in numerous human endometrioid cancer cell lines, including Ishikawa, HEC-50, HEC-1-A, HOUA-I, and RL95-2 [41,42,43], as well as in clinical uterine corpus endometrial carcinoma [44,45]. The gene discussed is CD274; the disease is uterine corpus endometrial carcinoma.