The study drug, radium-223, gives off radiation that helps to kill cancer cells in the prostate. It is already available for patients to receive as a treatment for prostate cancer that has not responded to testosterone lowering treatment and has spread to the bones. This type of cancer is called metastatic castration-resistant prostate cancer, also called mCRPC. Sometimes, researchers continue studying an available treatment to learn more about how it affects patients' daily lives.

In this study, the researchers want to learn more about how radium-223 affects the patients' ability to do their daily tasks. The patients in this study will already be receiving treatment with radium-223 as part of their routine care. The tests and measurements in this study will be done by the patients' own doctors. The researchers will collect information about the patients' treatment and results.

The study will include patients with mCRPC who have at least 2 tumors in their bones. These patients will have recently started treatment with radium-223. The patients will have also had surgery or treatment to lower their testosterone levels. But, the treatment did not help their cancer. The study will include about 105 men in Colombia who are at least 18 years old.

All of the patients will receive radium-223 through a needle put into the vein, also called an intravenous injection. They will visit their doctor's office up to 8 times during 28 weeks. At these visits, their doctors will ask how they are feeling and what medications they are taking, and will take blood samples. The doctors will also give the patients surveys about their physical, social, and emotional health and about the symptoms of their prostate cancer.

Inclusion Criteria:

• Male adult patients (> 18 years)
• Label Xofigo
• Signed informed consent
• No participation in an investigational program with interventions outside of routine clinical practice.
• Decision to initiate treatment with Radium-223 made as per investigator's routine treatment practice, as treatment option for mCRPC either as first line (naïve), second line (after progression during treatment with enzalutamide or abiraterone) or third line (post-Docetaxel).

Exclusion Criteria:

• Patients with contraindications to the use of Radium-223 according to the local label.
• Patients and who refused to sign the informed consent form.

Colombian patients diagnosed with metastatic castration-resistant prostate cancer (mCRPC).

Availability of this study's data will later be determined according to Bayer's commitment to the EFPIA/PhRMA "Principles for responsible clinical trial data sharing". This pertains to scope, timepoint and process of data access. As such, Bayer commits to sharing upon request from qualified researchers patient-level clinical trial data, study-level clinical trial data, and protocols from clinical trials in patients for medicines and indications approved in the US and EU as necessary for conducting legitimate research. This applies to data on new medicines and indications that have been approved by the EU and US regulatory agencies on or after January 01, 2014.

Interested researchers can use www.vivli.org to request access to anonymized patient-level data and supporting documents from clinical studies to conduct research. Information on the Bayer criteria for listing studies and other relevant information is provided in the member section of the portal.