“…Some trials (Castiglione-Gertsch et al, 1993) suggested that tamoxifen's primacy may be challenged particularly by the use of progestogens in patients suffering from bone metastases (Muss et al, 1988;Muss et al, 1990;Castiglione-Gertsch et al, 1993;Gill et al, 1993). In those trials, as already observed, the dose of progestogen (Mattson, 1980;Löber et al, 1981;Cavalli et al, 1984;Tchekmedyian et al, 1986;Van-Veelen et al, 1986) could be of paramount for determining the antitumor efficacy of these agents: high doses of drugs could significantly increase the response rate and even, in some observations, prolong time to treatment failure and survival (Mattson, 1980;Löber et al, 1981;Cavalli et al, 1984;Tchekmedyian et al, 1986;Van Veelen et al, 1986). Furthermore, like first-line hormonotherapy for advanced ER positive breast cancers, in premenopausal patients, HD-MPA developed antitumour activity at least equivalent, if not superior, to oophorectomy (Martoni et al, 1991).…”