To evaluate whether the levels of endometrial immune cells were modulated by PRP treatment, the CD56+ NK cells, CD8+ T cells, CD68+ macrophage cells, CD163+ macrophage cells, Foxp3+ Treg cells, T-bet+ Th1 cells, and GATA3+ Th2 cells were examined with the use of IHC staining in persistent CE patients before and after PRP treatment (Figure 3A). This evidence concerns the gene CD163 and cholesteryl ester measurement.