6. Discontinue any steroids prescribed to specifically treat prostate cancer (for e.g as a secondary hormonal manipulation or for cord compression) > 4 weeks prior to study drug. Steroids chronically prescribed for a non-cancer-related illness [e.g. asthma or chronic obstructive pulmonary disease (COPD)] that is well controlled with medical management are permissible to an equivalent of <10 mg Prednisone daily. Note: Steroids may be administered during the study as supportive care