IGF1 and endometriosis: Numerous cytokines and growth factors, such as monocyte chemotactic protein‐1 (MCP‐1),5, 6, 7 hepatocyte growth factor (HGF),5, 8 and insulin‐like growth factor‐1 (IGF‐1)9, 10 have been shown to be elevated in peritoneal fluid (PF) of women with endometriosis.