“…Firstly, clinical experience shows that breast cancers may regress following endocrine deprivation therapy, most notably ovariectomy (Thomson 1902) and the administration of gonadotrophin-releasing hormone (GnRH) analogues (Blamey & Dixon 1991) in premenopausal women, and hypophysectomy (Luft et al 1952), adrenalectomy (West et al 1952), anti-oestrogens (Stewart 1989) and aromatase inhibitors (Miller 1997) in postmenopausal women. Conversely, there is evidence that administration of steroid hormones increases tumour growth (Dao et al 1982, Conte et al 1985.…”