Studies on patients diagnosed with endometriosis havehighlighted that TNF-α is a likely factor in developing endometriosisas suggested by elevated levels of TNF-α inperitoneal fluid and the up-regulation of TNF-α in peritonealmacrophages and peripheral blood monocytes (10, 11).However, the exact role which TNF-α plays in endometrialtissue is ambiguous (12). Here, TNF is linked to endometriosis.