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Sodium Clodronate Increases Survival for Men With Advanced Prostate Cancer, But Not Localised Disease NEW YORK -- August 10, 2009 -- Oral sodium clodronate improves overall survival in men with advanced prostate cancer, but does not reduce the risk of death in men with localised disease, according to the final results of the MRC PR05 and MRC PR04 trials, published in online first and in the September issue of The Lancet Oncology. In 1994, two UK-led trials commenced to examine the effect of sodium clodronate in men with advanced or localised prostate cancer. In the first trial, 311 men with advanced prostate cancer who were starting or responding to hormone therapy for bone metastases were randomly allocated to take oral sodium clodronate or placebo for up to 3 years. In the second trial, 508 men with localised prostate cancer who were receiving standard care (usually treatment with radiotherapy, hormone therapy, or both) were randomly allocated to take oral sodium clodronate or placebo for up to 5 years. The primary results of the original trials, published 6 and 3 years previously, showed that men with advanced disease had a reduction in the development of symptomatic bone metastases and some improvement in overall survival, and men with localised disease showed no improvement in overall survival or delay in the spread of cancer. In the current study, Matthew Sydes, Medical Research Council Clinical Trials Unit, London, United Kingdom, and colleagues report the long-term survival outcomes of patients involved in both the original trials. Findings showed a 23% relative decrease in death in the group allocated to clodronate. At 5 years, overall survival was 30% in the clodronate treated group and 21% in the placebo group, and after 10 years, 17% vs 9%, respectively. In men with localised disease, clodronate showed no benefit in overall survival; at 5 years, overall survival was 78% in patients given clodronate and 80% in patients given placebo, and after 10 years 48% vs 51%. “PR05 is the first trial, to our knowledge, to show an overall survival benefit conferred by an oral bisphosphonate when given in addition to standard hormone therapy to men with bone metastases who are starting or responding to hormone therapy. However, there is no evidence that clodronate is of any benefit when given as an adjuvant to treatment in men with non-metastatic prostate cancer,” the authors wrote. SOURCE: The Lancet Oncology E-mail this page to a friend or colleague! To print, use this version