Clinical Correlates of Benefit From Radium-223 Therapy in Metastatic Castration Resistant Prostate Cancer.

Abstract

BACKGROUND:

We sought to identify potential clinical variables associated with outcomes after radium-223 therapy in routine practice.

METHODS:

Consecutive non-trial mCRPC patients who received ≥1 dose of radium dichloride-223 at four academic and one community urology-specific cancer centers from May 2013 to June 2014 were retrospectively identified. Association of baseline and on-therapy clinical variables with number of radium doses received and clinical outcomes including overall survival were analyzed using chi-square statistics, cox proportional hazards, and Kaplan-Meier methods. Bone Scan Index (BSI) was derived from available bone scans using EXINI software.

RESULTS:

One hundred and forty-five patients were included. Radium-223 was administered for six cycles in 74 patients (51%). One-year survival in this heavily pre-treated population was 64% (95%CI: 54-73%). In univariate and multivariate analysis, survival was highly associated with receiving all six doses of Radium-223. Receipt of six doses was associated with ECOG PS of 0-1, lower baseline PSA & pain level, no prior abiraterone/enzalutamide, <5 BSI value, and normal alkaline phosphatase. In patients who reported baseline pain (n = 72), pain declined in 51% after one dose and increased in 7%. PSA declined ≥50% in 16% (18/110). Alkaline phosphatase declined ≥25% in 48% (33/69) and ≥50% in 16/69 patients. BSI declined in 17 (68%) of the 25 patients who had bone scan available at treatment follow-up. Grade ≥3 neutropenia, anemia, and thrombocytopenia occurred in 4% (n = 114), 4% (n = 125), and 5% (n = 123), respectively.

CONCLUSIONS:

Patients earlier in their disease course with <5 BSI, low pain score, and good ECOG performance status are optimal candidates for radium-223. Radium-223 therapy is well tolerated with most patients reporting declines in pain scores and BSI. Prostate 77:479-488, 2017. © 2016 Wiley Periodicals, Inc.

• Authors: Ajjai Alva, Luke Nordquist, Stephanie Daignault, Saby George, Jorge Ramos, Costantine Albany, Sudhir Isharwal, Matthew McDonald, Gregory Campbell, Pongwut Danchaivijitr, Sarah Yentz, Aseem Anand, Evan Y Yu
• Journal: The Prostate (Prostate) Vol. 77 Issue 5 Pg. 479-488 (04 2017) ISSN: 1097-0045 [Electronic] United States
• PMID: 27990667 (Publication Type: Journal Article, Multicenter Study)
• Copyright: © 2016 Wiley Periodicals, Inc.

Chemical References

• Antineoplastic Agents
• Radioisotopes
• radium Ra 223 dichloride
• Radium

Topics

• Administration, Intravenous
• Aged
• Aged, 80 and over
• Antineoplastic Agents (administration & dosage)
• Cohort Studies
• Humans
• Male
• Middle Aged
• Prostatic Neoplasms, Castration-Resistant (diagnosis, drug therapy, mortality)
• Radioisotopes (administration & dosage)
• Radium (administration & dosage)
• Retrospective Studies
• Survival Rate (trends)