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Bone drug suppresses wandering tumor cells in breast cancer patients
Date:6/2/2010

The bone-strengthening drug zoledronic acid (Zometa) can help fight metastatic breast cancer when given before surgery, suggests research at Washington University School of Medicine in St. Louis.

When the drug was given along with chemotherapy for three months before breast cancer surgery, it reduced the number of women who had tumor cells in their bone marrow at the time of surgery.

The study was published in the May issue of The Lancet Oncology.

Every day, tumors shed thousands of cells, which spread throughout the body and are referred to as disseminated tumor cells (DTCs). Breast cancer DTCs often lodge in bone marrow where bone growth factors help them survive.

Chemotherapy can increase bone turnover and bone growth factors, potentially exacerbating the problem of DTCs in the bone, which can resurface later to cause metastatic disease in cancer patients.

"Bone marrow seems to be a DTC sanctuary, allowing them to adapt and disseminate to different organs, where they're a leading cause of death," says study leader Rebecca Aft, MD, PhD, associate professor of surgery and a breast cancer specialist at the Alvin J. Siteman Cancer Center at Barnes-Jewish Hospital and Washington University School of Medicine. "We believe that zoledronic acid inhibits the release of growth factors that help support the growth of DTCs."

Zoledronic acid is generally prescribed to reduce and delay bone complications due to multiple myeloma and bone metastases from solid tumors. Two recent studies showed that zoledronic acid improves disease-free survival when used along with estrogen-lowering therapy before breast cancer surgery. Estrogen-lowering therapy, like chemotherapy, potentially increases bone loss.

In this randomized phase II clinical trial, researchers split 109 women with newly diagnosed stage II or stage III breast cancer into two groups. The control group received chemotherapy alone, while the othe
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Contact: Gwen Ericson
ericsong@wustl.edu
314-286-0141
Washington University School of Medicine
Source:Eurekalert  

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