TNF and polycystic ovary syndrome: Endometrial cells from women with PCOS differentially express genes related to endometrial function (e.g., steroid hormone receptors for E2, P4, and androgens) [201], endometrial receptivity (e.g., HOXA10 and IGF-binding protein 1) [202], and inflammation (IL-8, TNFα, NFκB, CCL2, CCL5, and CCL7) [202,203].