FOXP3 and Infertility: About the endometriosis-associated infertility André et al. [67] reported that FoxP3 polymorphisms can be associated with risk of idiopathic infertility (rs2280883 and rs2232368) and endometriosis (rs3761549), and this is congruent with other reports (see before) about the importance of FoxP3+ CD4+ Tregs in the pathogenesis of the disease.