CD274 and carcinosarcoma: Figure 1B–I presents representative photomicrographs of PD-L1/PD-L2 and PD-1 expression of tumor cells and cells of the TME of tumor tissues from patients with grade 3 stage 1 ((carcinosarcoma predominantly endometrioid) node-positive poorly differentiated EC with 48% myometrial invasion, LVI, and pT1a (sn)pN0i+).