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Zoledronic acid reduces the recurrence of breast cancer in post-menopausal women
Date:9/25/2011

Stockholm, Sweden: A trial investigating the use of zoledronic acid to aid chemotherapy for breast cancer has found a significant benefit for post-menopausal women, according to results presented at the 2011 European Multidisciplinary Cancer Congress [1] today (Sunday). Researchers think it could be the key for a greater understanding of the mechanisms of breast cancer recurrence as well as offering new options for patient care.

Zoledronic acid is one of the bisphosphonates, a group of drugs mainly used to treat osteoporosis. However they are also given to cancer patients to protect against the effects of secondary bone cancer, such as pain and weakness in the bones. Laboratory studies have suggested that zoledronic acid might also have direct anti-tumour effects and enhance other chemotherapy treatments, so the multi-centre AZURE trial was set up to investigate further.

Led by Professor Robert Coleman at the Weston Park Hospital in Sheffield, UK, the trial recruited 3,360 patients with stage II/III breast cancer from 174 centres. They were randomised to receive chemotherapy and/or endocrine therapy, with or without zoledronic acid. An interim analysis of the trial's progress indicated that patients were seeing no clinical benefit from the treatment, so the data were released for more detailed scrutiny.

This confirmed the drug's lack of impact, apart from in a sub-set of women who had undergone menopause five or more years previously. Here, the overall survival rate was 85% compared to 79% for women who did not receive zoledronic acid. The effect was independent of the characteristics of the disease as shown by the stage of the tumour, oestrogen receptor status, and lymph node involvement.

"This is a small but significant increase," Prof Coleman explains. "The finding is not sufficient to be taken up on its own but in the context of other studies and additional data anticipated later in the year, it is likely to change pract
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Contact: Saffina Rana
saffina.rana@europe.com
ECCO-the European CanCer Organisation
Source:Eurekalert

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