“…Conditions of oestrogen excess have been reported to exacerbate endometriosis, while medical interventions that inhibit oestrogen production or action, i.e. down-regulating doses of gonadotrophin-releasing hormone (GnRH) analogues (Schriock et al, 1985), progestins (Vercellini et al, 1997), androgens (Barbieri et al, 1982) and anti-oestrogens (Haber and Behelak, 1987), ameliorate its symptoms.…”