The authors measuredthe levels of vascular endothelial growth factor inserum and peritoneal fluid of 179 women, 90 ofwhom were diagnosed with endometriosis, andobserved that serum VEGF levels were similar inboth study groups while women with endometriosishad higher levels of VEGF in peritoneal fluidcompared with controls. Here, VEGFA is linked to endometriosis.