Endometriosis 1, also known as endometriosis, susceptibility to, 1, is related to retinoblastoma and thrombophilia due to thrombin defect. An important gene associated with Endometriosis 1 is ENDO1 (Endometriosis, Susceptibility To, 1). The drug Hormones has been mentioned in the context of this disorder. Affiliated tissues include ovary and endothelial, and related phenotypes are decreased fertility and dysmenorrhea