Descriptive Analysis of Clinical Outcomes in Patients With Prostate Gland Cancer, Which Spreads to Other Parts of the Body, Who Were Treated First With Novel Anti-hormone Therapy Followed by a Second Line Treatment With Novel Anti-Hormone Therapy or RadIum-223 (Xofigo).

Ra-223 was approved by the FDA in May 2013 for the treatment of patients with castration-resistant prostate cancer, symptomatic bone metastases and no known visceral metastatic disease.

Abiraterone is a CYP17 inhibitor. It was approved by the FDA for the treatment of patients with mCRPC in 2011, and for patients with metastatic high-risk castration-sensitive prostate cancer in 2018.

Enzalutamide is an androgen receptor inhibitor. It was approved by the FDA for the treatment of patients with mCRPC in 2012, with warning and precautions added in 2017 regarding the risk of seizure and encephalopathy.