Interestingly, on average every second tumor-infiltrated M-MDSC and e-MDSC displayed PD-L1 expression (PD-L1+ M-MDSC: 55.26 ± 10.70%, PD-L1+ e-MDSC: 49.17 ± 9.40%) being significantly elevated in comparison to both liquid samples (blood PD-L1+ M-MDSC: 14.96 ± 9.32%, ascites PD-L1+ M-MDSC: 8.38 ± 5.41%, blood PD-L1+ e-MDSC: 2.09 ± 1.27%, ascites PD-L1+ e-MDSC: 8.56 ± 2.16%, Figure 3D). This evidence concerns the gene CD274 and neoplasm.