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Clinical trial advances new approach to re-sensitizing breast cancer
Date:12/11/2009

San Antonio, Tex. A new drug cocktail might be the right mix to fight breast cancer after it becomes resistant to standard therapy. Details of a new study supporting this approach suggest it's possible to re-sensitize tumors thus allowing treatments to work again. The findings were presented today at the CTRC-AACR San Antonio Breast Cancer Symposium.

The study involves post-menopausal women whose advanced breast cancers are fueled by estrogen, often called estrogen-receptor or progesterone-receptor positive cancers. The standard treatment is anti-hormonal medicines, such as aromatase inhibitors (AIs), which lower the amount of estrogen in the body. Over time, however, the cancer figures out a way to thrive without the estrogen. The treatment strategy under investigation to fight this resistance combines an aromatase inhibitor with sorafenib, an oral medication FDA-approved to treat liver and kidney cancers.

"We believe the sorafenib might disrupt the machinery created by the tumor to grow without the estrogen," says Claudine Isaacs, MD, clinical director of breast cancer program at Georgetown Lombardi Comprehensive Cancer Center and presenting author of the study. "After the machinery is destroyed, the aromotase inhibitor can do its work again. We're already seeing some encouraging responses to this approach."

The multi-center, phase II study involves 35 post-menopausal women with metastatic breast cancer resistant to aromotase inhibitors. The women continue taking an aromotase inhibitor for the study, but they also take sorafenib. The analysis presented today demonstrates a clinical benefit rate in 20 percent of the women. Clinical benefit means the patient has a complete or partial response and includes those who have stable disease for at least 6 months (24 weeks).

Isaacs says this finding suggests that sorafenib is acting to reverse resistance to AIs as this type of response would not have been expected with either so
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Contact: Karen Mallet
km463@georgetown.edu
215-514-9751
Georgetown University Medical Center
Source:Eurekalert

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