FOXP3 and endometriosis: The results showed a significant increase in the expression of protein C7 and the number of CD3+FOXP3+ Treg cells in endometriosis lesions compared to normal endometrium (protein C7 expression, NE groups vs. OEMs groups, p < 0.001; CD3+FOXP3+ Treg cell number, NE groups vs. OEMs groups, p < 0.001).