This is an open label study designed to examine the effects of Enzalutamide with concurrent administration of Radium Ra 223 dichloride in castrate resistant (hormone-refractory) prostate cancer subjects with symptomatic bone metastasis, in both the pre- and post- chemotherapy setting.~Radium Ra 223 dichloride is approved by the US Food and Drug Administration for this indication. Enzalutamide is US Food and Drug Administration approved for this indication.~Approximately 40 subjects will be enrolled to obtain 30 evaluable subjects. All subjects will receive Radium Ra 223 dichloride every 4 weeks for a total of 6 doses over 24 weeks and concurrent Enzalutamide for a minimum duration of 24 weeks. The sponsor will provide Enzalutamide after the End of Treatment visit until the last Long Term Follow Up visit has been completed. Subjects will continue to receive Enzalutamide as long as a positive response to therapy is demonstrated. Enzalutamide may be discontinued at any time per physician discretion.~Subjects will be evaluated 30 days after the last dose of Radium Ra 223 dichloride. Including screening, the total duration of the study is 32 weeks plus every 3 month follow up visits while subjects are receiving Enzalutamide.
This is an open label study designed to examine the effects of Enzalutamide with concurrent administration of Radium Ra 223 dichloride in Castrate-Resistant (Hormone-Refractory) Prostate Cancer subjects with symptomatic bone metastases in both the pre- and post-chemotherapy setting.