The numerous macrophages in peritoneal fluid of patients with endometriosis secrete many kinds of enhancing cytokines for endometriosis progression, including pro-inflammatory cytokines [7]; tumor growth factor (TGF)-β [8], interleukins (IL)-6 and-10, angiogenic factors, vascular endothelial growth factor (VEGF) [9, 10], and an inhibitory cytokine; IL-24 [11]. The gene discussed is IL6; the disease is endometriosis.