- For patients treated by medical means of gonadal ablation (GnRH analogues), or estrogens, evidence of appropriate testosterone suppression should be obtained prior to study entry (testosterone <50 ng/L). Continuation of gonadal androgen suppression should be carried out with GnRH analogues only. Antiandrogens or other steroidal compounds (except for dexamethasone used in this study) should be discontinued as noted in section 4.1.3 prior to study entry. Patients receiving low dose (<10 mg of prednisone/day) continuous corticosteroids >6 months, who present with objective evidence of disease progression may continue on the steroids (prednisone 10 mg) and are considered eligible. Prior orchiectomy is allowed and at least 4 weeks must have elapsed since completion of surgery. Patients may not be receiving Megace.