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Randomized controlled trial of early zoledronic acid in men with castration-sensitive prostate cancer and bone metastases: results of CALGB 90202 (alliance).

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Smith M.R., Halabi S., Ryan C.J., Hussain A., Vogelzang N., Stadler W., Hauke R.J., Monk J.P., Saylor P., Bhoopalam N., Saad F., Sanford B., Kelly W.K., Morris M., Small E.J.

Journal of clinical oncology: official journal of the American Society of Clinical Oncology 2014

Zoledronic acid decreases the risk for skeletal-related events (SREs) in men with castration-resistant prostate cancer and bone metastases but its role earlier in the natural history of the disease is unknown. This phase III study evaluated the efficacy and safety of earlier treatment with zoledronic acid in men with castration-sensitive metastatic prostate cancer. Men with castration-sensitive prostate cancer and bone metastases whose androgen-deprivation therapy was initiated within 6 months of study entry were randomly assigned in a blinded 1:1 ratio to receive zoledronic acid (4 mg intravenously every 4 weeks) or a placebo. After their disease progressed to castration-resistant status, all patients received open-label treatment with zoledronic acid. The primary end point was time to first SRE, defined as radiation to bone, clinical fracture, spinal cord compression, surgery to bone, or death as a result of prostate cancer. Target accrual was 680 patients. Primary analysis was planned after 470 SREs. The study was discontinued prematurely (645 patients; 299 SREs) after the corporate supporter withdrew study drug supply…(vermás)

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