The following article features coverage from the 2020 Genitourinary Cancers Symposium meeting. Click here to read more of Renal and Urology News’ conference coverage.

SAN FRANCISCO—Men with metastatic castration-resistant prostate cancer (mCRPC) with predominantly bone metastases who receive more than 4 cycles of radium-223 have significantly better overall survival (OS) than those who receive 4 or fewer cycles, investigators reported at the 2020 Genitourinary Cancers Symposium.

In addition, baseline alkaline phosphatase (ALP) concentration is independently associated with better OS and could be used to identify patients most likely to benefit from the medication.

In a retrospective study of 114 men who received radium-223, Esmail Mutahar Al-Ezzi, MD, and colleagues at Princess Margaret Cancer Centre in Toronto found that men received more than 4 doses of the drug had significantly longer OS and progression-free survival than those who received 4 or fewer doses (19.8 vs 4.56 months and 7.45 vs 2.9 months, respectively). Compared with men who received more than 4 doses, those who received 4 or fewer doses had significant 8.4-fold and 4.6-fold increased risks of death and progression, respectively.

The baseline median ALP for men who received more than 4 doses was significantly lower than that of those who received 4 or fewer doses was (98 vs 154 U/L).

On multivariate analysis, subsequent treatment, administration of more than 4 cycles of radium-223, and baseline ALP below 150 U/L were associated with improved OS.

Of the 114 men, 68 (59.6%) received more than 4 doses of radium-223 and 46 (40.4%) received 4 or fewer doses.

Of the cohort, 58% had 6 to 20 bone metastases and 28% had more than 20 bone metastases.

Read more of our coverage of the 2020 Genitourinary Cancers Symposium by visiting the conference page.

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Reference

Al-Ezzi EM, Alqaisi H, Picardo S, et al. Prognostic factors that affect survival outcomes in men with metastatic castration-resistant prostate cancer (mCRPC) treated with radium-223. Presented at the 2020 Genitourinary Cancers Symposium held February 13 to 15 in San Francisco. Abstract 225.