Adding radium-223 to abiraterone or enzalutamide is safe and may prolong overall survival for patients with metastatic castration-resistant prostate cancer (mCRPC), a study published in The Lancet Oncology has shown. For this international, open-label, single-arm, phase 3b study, researchers enrolled 839 patients with progressive bone-predominant mCRPC and with 2 or more skeletal metastases on imaging. Of enrolled patients, 696 received 1 or more doses of radium-223 and 403 completed all 6 planned injections. Use of other concomitant therapies, such as abiraterone, enzalutamide, and denosumab, were permitted. Median overall survival was longer in patients who received radium-223 plus abiraterone, enzalutamide, or both, compared with those who did not receive abiraterone or enzalutamide (median, not reached versus 13 months). Patients who received radium-223 with denosumab had a longer overall survival than those who received radium-223 with denosumab (median, not reached versus 13 months). Median overall survival was longer for men with: a baseline alkaline phosphatase concentration less than the upper limit of normal, a baseline hemoglobin level of 10 g/dL or greater, a baseline ECOG performance status of 0, and no reported baseline pain. A total of 35% of patients reported any grade of serious adverse events. Treatment-emergent adverse events of any grade occurred for 75% of patients.
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