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Virus kills breast cancer cells in laboratory
Date:9/22/2011

A nondisease-causing virus kills human breast cancer cells in the laboratory, creating opportunities for potential new cancer therapies, according to Penn State College of Medicine researchers who tested the virus on three different breast cancer types that represent the multiple stages of breast cancer development.

Adeno-associated virus type 2 (AAV2) is a virus that regularly infects humans but causes no disease. Past studies by the same researchers show that it promotes tumor cell death in cervical cancer cells infected with human papillomavirus. Researchers used an unaltered, naturally occurring version of AAV2 on human breast cancer cells.

"Breast cancer is the most prevalent cancer in the world and is the leading cause of cancer-related death in women," said Samina Alam, Ph.D., research associate in microbiology and immunology. "It is also complex to treat."

Craig Meyers, Ph.D., professor of microbiology and immunology, said breast cancer is problematic to treat because of its multiple stages.

"Because it has multiple stages, you can't treat all the women the same. Currently, treatment of breast cancer is dependent on multiple factors such as hormone-dependency, invasiveness and metastases, drug resistance and potential toxicities. Our study shows that AAV2, as a single entity, targets all different grades of breast cancer."

Cells have multiple ways of dying. If damage occurs in a healthy cell, the cell turns on production and activation of specific proteins that allow the cell to commit suicide. However, in cancer cells these death pathways are often turned off, while the proteins that allow the cell to divide and multiply are stuck in the "on" position.

One way to fight cancer is to find ways to turn on these death pathways, which is what researchers believe is happening with the AAV2 virus. In tissue culture dishes in the laboratory, 100 percent of the cancer cells are destroyed by the virus within seven days, with the ma
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Contact: Matthew Solovey
msolovey@hmc.psu.edu
717-531-8606
Penn State
Source:Eurekalert

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