Journal
EUROPEAN JOURNAL OF CANCER
Volume 48, Issue 5, Pages 678-686Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ejca.2011.12.023
Keywords
Pain; Bone metastases; Prostate cancer; Castration-resistant; Alpha-pharmaceutical; Radium; Alpharadin; BPI; Functional index
Categories
Funding
- Algeta ASA
- Bayer Health-Care Pharmaceuticals
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Purpose: To investigate the dose-response relationship and pain-relieving effect of radium-223, a highly bone-targeted alpha-pharmaceutical. Methods: One hundred patients with castration-resistant prostate cancer (CRPC) and painful bone metastases were randomized to a single intravenous dose of 5, 25, 50 or 100 kBq/kg radium-223. The primary end-point was pain index (visual analogue scale [VAS] and analgesic use), also used to classify patients as responders or non-responders. Results: A significant dose response for pain index was seen at week 2 (P = .035). At week 8 there were 40%, 63%, 56% and 71% pain responders (reduced pain and stable analgesic consumption) in the 5, 25, 50 and 100 kBq/kg groups, respectively. On the daily VAS, at week 8, pain decreased by a mean of -30, -31, -27 and -28 mm, respectively (P = .008, P = .0005, P = .002, and P < .0001) in these responders (post-hoc analysis). There was also a significant improvement in the brief pain inventory functional index for all dose-groups (P = .04, .01, .002 and .02, Wilcoxon signed rank test). Furthermore, a decrease in bone alkaline phosphatase in the highest dose-group was demonstrated (P = .0067). All doses were safe and well tolerated. Conclusion: Pain response was seen in up to 71% of the patients with a dose response observed 2 weeks after administration. The highly tolerable side-effect profile of radium-223 previously reported was confirmed. (C) 2012 Elsevier Ltd. All rights reserved.
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