Interestingly, the clinicopathologic analysis of cancer patients revealed a higher level of ascites- but not tumour-infiltrarting PD-L1+M-MDSCs versus PD-L1+MO/MA in advanced stage (p < 0.001, Fig. 4a), grades II and III (both p < 0.01, Fig. 4b), type I and II (both p < 0.01, Fig. 4c) as well as both serous (p < 0.001) and mucinous (p < 0.05) OC (Fig. 4d). Here, CD274 is linked to neoplasm.