Usefulness of radium-223 in patients with bone metastases.

Castration-resistant prostate osseous metastases can be challenging to treat. There is a new era of clinical advancement with the Food and Drug Administration approval of radium-223 for use in these patients. Radium-223 is the only clinically used therapeutic radiopharmaceutical that emits alpha particles, making it extremely safe for therapeutic purposes for the patient as well as close contacts.