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The study was presented at the San Antonio Breast Cancer Symposium.

In the ATAC study, women Lacoste Mens Polo Shirts Sale Uk were given either the aromatase inhibitor Arimidex, tamoxifen, or both. "They have now been followed for 10 years and the groups have the same risk of cardiovascular disease," Buzdar tells WebMD.

But a woman who already has risk factors for heart disease and takes an aromatase inhibitor has a 7% chance of developing heart problems, Amir tells WebMD.

to an aromatase inhibitor after several years rather than starting with an aromatase inhibitor and staying on it may reduce the risk of dying from causes other than breast cancer," he says. "But this is just a hypothesis at this point."

A Visual Guide to Breast Cancer

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In recent years, its use has been largely supplanted by aromatase inhibitors, which actually shut down the body's ability to make estrogen.

Aromatase Inhibitors vs. Tamoxifen: What Should Women Do?The findings suggest that women at risk for heart disease should limit use of aromatase inhibitors, Amir says.

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Tamoxifen, which blocks estrogen from getting into cancer cells, slowing tumor growth, has been used for decades to treat breast cancer.

"Treatment with aromatase inhibitors is associated with a significant increase in the risk of cardiovascular events, specifically heart attacks, angina, and heart failure, compared with tamoxifen," says Eitan Amir, MD, a senior fellow in oncology and hematology at the Princess Margaret Hospital in Toronto.

In fact, the analysis showed that 132 patients must be treated with an aromatase inhibitor before one cardiovascular problem occurs. "This number needed to harm is relatively high," Amir says.

For the study, Amir polled the results of seven trials of tamoxifen and aromatase inhibitors involving nearly 30,000 postmenopausal women with early breast cancer.

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Dec. 9, 2010 (San Antonio) Postmenopausal women with early breast cancer who take newer hormone drugs known as aromatase inhibitors are 26% more likely to develop heart disease than those who take the old standby tamoxifen, researchers report.

But other studies have shown a small increased risk of heart problems in women taking aromatase inhibitors, Amir says. Other aromatase inhibitors are Aromasin and Femara.

Aromatase Inhibitors May Raise Heart Risks

However, the actual risk of any individual woman developing heart problems was relatively small about 4% in women taking either aromatase inhibitors or tamoxifen, he says.

An expert who worked on the landmark ATAC study that first showed the effectiveness of aromatase inhibitors disagrees.

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Aromatase Inhibitors vs. Tamoxifen: How they Work About two thirds of breast tumors are fueled by estrogen.