PDCD1LG2 and neoplasm: The highest percentage of myeloid DCs with PD-L2 expression was detected in PF, and it was significantly higher than in PB of OC patients (p < 0.0001; median 34.50% vs. 2.94%) and in PB of the control group (p < 0.001; median 34.50% vs. 20.21%) and higher than in the tumor; however, the difference did not reach statistical significance (median 34.50% vs. 24.01%; p > 0.05; Figure 2B).