CD274 and endometrial cancer: One of the aims of our study was to investigate the relationships between mDCs, pDCs, and MO expressing PD-L1 and PD-L2, the plasma levels of sPD-1, sPD-L2 and sPD-L2, as well as the gene expression levels of PD-L1 and PD-L2 in tissue, with the clinical features of patients with endometrial cancer.