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Bone-Strengthening Drug Guards Against Spread of Breast Cancer
Date:4/1/2010

Zoledronic acid protected against chemotherapy-related bone loss, metastasis, study finds

WEDNESDAY, March 31 (HealthDay News) -- The bone-strengthening drug zoledronic acid (Zometa) reduces the spread of breast cancer by preventing chemotherapy-related bone loss, a new study suggests.

Tumor cells released from the primary breast cancer site often travel to the bone marrow and spread from there to other areas of the body. Chemotherapy speeds up bone turnover, which releases bone-derived growth factors that can promote tumor growth in breast cancer patients.

It's been suggested that zoledronic acid -- which reduces bone loss by slowing the activity of cells that destroy bone -- can make bone marrow a less inviting place for cancer cells.

The new phase 2 trial included 120 women undergoing chemotherapy for locally advanced breast cancer. Some of the patients received 4 milligrams of zoledronic acid every three weeks for one year starting with their first dose of chemotherapy, while others received no zoledronic acid.

Bone marrow samples were taken at the start of the study and again after three months and one year of treatment. At the start of the study, 45.7 percent of patients had detectable tumor cells in their bone marrow. After three months of treatment, women who received zoledronic acid and chemotherapy had fewer detectable tumor cells than those who received chemotherapy alone, according to Rebecca Aft, of the Washington University School of Medicine in St. Louis, and colleagues.

Among women who had no tumor cells in their bone marrow at the start of the study, 87 percent of those in the zoledronic acid group were free of tumor cells at three months, compared with 60 percent of those who received chemotherapy alone. One year after treatment, the rates were 40 percent and 33 percent, respectively, the study authors noted.

The researchers also found that zoledronic acid prevented c
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