It has been reported that elevated expressions of vascular endothelial growth factor (VEGF) and interleukin 8 (IL8) induce the production of vascular endothelial cells in ectopic endometrial lesions and that anti-VEGF/VEGF receptor treatments suppress the development of endometriosis in animal models [12, 13]. Here, CXCL8 is linked to endometriosis.