Published in:
01-11-2011 | Original Article
A phase I study of combined docetaxel and repeated high activity 186Re-HEDP in castration-resistant prostate cancer (CRPC) metastatic to bone (the TAXIUM trial)
Authors:
Joyce M. van Dodewaard-de Jong, John M. H. de Klerk, Haiko J. Bloemendal, Bart P. J. van Bezooijen, Marie J. de Haas, Richard H. Wilson, Joe M. O’Sullivan
Published in:
European Journal of Nuclear Medicine and Molecular Imaging
|
Issue 11/2011
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Abstract
Purpose
Bone-seeking radiopharmaceuticals have palliative benefit in castration-resistant prostate cancer (CRPC) metastatic to bone. Recent studies have shown improvement of survival and quality of life when radiopharmaceuticals were given repeatedly or in combination with chemotherapy. We designed a phase I study combining docetaxel and 186Re-labelled hydroxyethylidene diphosphonate (HEDP) in men with CRPC and bone metastases to evaluate toxicity.
Methods
A dose escalation schedule was designed consisting of four dose levels with a standard dosage of docetaxel (75 mg/m2 3-weekly). 186Re-HEDP was given in increasing activities (1,250 MBq up to 2,500 MBq) after the third and sixth cycle of docetaxel. Dose limiting toxicity (DLT) was defined as any grade 4 toxicity lasting more than 7 days or any grade 3 toxicity that did not recover within 10 days. Three patients were planned for each dose level expanding to six if a DLT occurred.
Results
Fourteen patients were recruited with a median age of 64.6 years. One DLT, grade 3 thrombocytopenia lasting >10 days, occurred at dose level 3 leading to expansion of this group to six. One of these patients had an episode of acute renal failure which resolved. Because of production problems of 186Re-HEDP dose level 4 was not started.
Conclusion
Combined therapy with docetaxel and 186Re-HEDP is generally well tolerated in patients with CRPC metastatic to bone. We will conduct a randomized phase II study using three cycles of docetaxel 75 mg/m2 3-weekly followed by 188Re-HEDP 40 MBq/kg body weight, followed by another three cycles of docetaxel 75 mg/m2, followed by 188Re-HEDP 20 MBq/kg body weight.