Radium-223 for the treatment of metastatic castration-resistant prostate cancer: A window of opportunity

F Gómez-Veiga, J L Álvarez-Ossorio, J Carballido-Rodríguez, A Juárez-Soto, A Rodríguez-Antolín, J M Cozar-Olmo
Actas Urologicas Españolas 2018, 42 (10): 616-624

CONTEXT: The elimination of bone metastases, restoration and/or preservation of bone morphology and prevention and/or delay of skeletal events are a fundamental objective in the management of metastatic castration-resistant prostate cancer (mCRPC). Radium-223 is the first targeted alpha therapy with effects on bone that has been shown to increase survival in these patients, besides providing other bone-related benefits.

OBJECTIVE: To analyze the impact of bone metastasis on mCRPC, and the benefits and the window of opportunity provided by radium-223 in the treatment of patients with mCRPC in the current treatment era.

EVIDENCE ACQUISITION: A bibliographic search of PubMed and Spanish and international congresses on radium-223 and other first-line treatments for mCRPC was performed. Recent guidelines and recommendations by experts were also consulted.

SUMMARY OF THE EVIDENCE: Evidence for the mechanism of action of radium-223 widen its effects to the tumor bone environment. Survival of patients treated with radium-223 is higher in those with mild symptoms as opposed to those with moderate-severe symptoms. The presence of visceral metastases even in the early stages of mCRPC supports starting radium-223 therapy before the symptoms become clinically relevant. A 3-year study has confirmed its good safety profile. Changes in tALP and LDH may be useful markers for monitoring the treatment with radium-223, but they are not predictors of overall survival.

CONCLUSION: Radium-223 is a valuable therapeutic alternative in the treatment of patients with mCRPC in early stages of the disease, with a good safety profile. Its benefits extend to the bone environment.

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