Treatment with any other investigational agent within weeks prior to randomization Use of any investigational agent within days prior to randomization. Use of investigational agent within days prior to randomization Treatment with any investigational drug days prior to randomization Exposure to any therapeutic agent (investigational or conventional) within days of date of randomization or to any agent for which half lives have not elapsed Exposure to any investigational agent within days of date of randomization. Treatment with any other investigational agent, or participation in another investigational drug trial within days prior to randomization Treatment with any other investigational agent, or participation in another investigational drug trial within days prior to randomization Any type of anticancer agent (including investigational) within weeks before randomization. Subjects enrolled in the current study must start treatment with the single hormone agent either within days prior to randomization or after randomization (before or simultaneously to the first injection of Ra-/placebo). Use of any investigational agent within days of randomization. Anti-cancer therapy or any treatment with an investigational agent within days prior to randomization Treatment with any investigational drug within days prior to randomization Exposure to any investigational agent, systemic chemotherapy, or therapeutic radiation within days of enrollment (Part ) or randomization (Part ). Investigational drug use within days of randomization. Use of investigational agent within days prior to Randomization Treatment with an investigational agent ? days prior to randomization Treatment with any other investigational agent, or participation in another investigational drug trial within days prior to randomization Exposure to any investigational agent within days of date of randomization. Exposure to any investigational agent within days of Randomization. Treatment with any other investigational agent within days prior to randomization Chemotherapy or investigational agent within weeks prior to randomization or antibody therapy within weeks prior to randomization Use of any investigational agent within days of randomization Use of non-study investigational agent(s) =< months prior to randomization