CD274 and neoplasm: In line with previous reports describing an inverse correlation between the levels of PD-L1 and the degree of tumor malignancy in human EC (Engerud et al., 2020; Zhang et al., 2020), we found that higher protein expression of PD-L1 seems to correlate with younger patient age, low-grade disease, early stage tumors, smaller tumor size, or superficial myometrial invasion.