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Treatment targeting PI3K may delay resistance to anti-HER2 therapy in breast cancer patients
Date:1/23/2013

PHILADELPHIA Patients with HER2-positive breast cancer being treated with anti-HER2 therapy may be able to prevent or delay resistance to the therapy with the addition of a phosphatidylinositol-3 kinase inhibitor to their treatment regimens.

The data, published in Cancer Research, a journal of the American Association for Cancer Research, indicated that failure of the anti-HER2 antibody trastuzumab to block HER2 from activating the phosphatidylinositol-3 kinase (PI3K) signaling pathway can lead to resistance to treatment. Therefore, dual simultaneous inhibition of both HER2 and PI3K may prolong the use of anti-HER2 therapies in women with breast cancer.

"HER2 breast cancer is a subtype of breast cancer for which we have an increasing number of effective treatments, including trastuzumab, an antibody that targets HER2," said Carlos L. Arteaga, M.D., director of the Breast Cancer Program at Vanderbilt-Ingram Cancer Center in Nashville, Tenn. "Unfortunately, many breast cancer tumors learn how to resist this therapy."

Arteaga and colleagues explored the possibility that aberrant signaling through the PI3K pathway was a mechanism of resistance to trastuzumab. They used breast cancer models of trastuzumab resistance with different modes of aberrant PI3K pathway activation, and treated the cells with a PI3K inhibitor with or without trastuzumab.

Inhibiting PI3K reduced cancer cells' ability to proliferate and induced the death of trastuzumab-resistant cells. In addition, combining PI3K inhibitors with trastuzumab resulted in superior anti-tumor effects against trastuzumab-resistant, HER2-positive cells in xenografts compared with the PI3K inhibitor alone.

The investigators also conducted analyses to determine how the drug combination decreased resistance to trastuzumab.

"We found that the trastuzumab-resistant cells in which the PI3K pathway was activated had high levels of an anti-death protein called surv
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Contact: Jeremy Moore
jeremy.moore@aacr.org
215-446-7109
American Association for Cancer Research
Source:Eurekalert

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