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A redeeming role for a common virus
Date:10/20/2010

Washington, DC A common virus that can cause coughing and mild diarrhea appears to have a major redemptive quality: the ability to kill cancer. Harnessing that power, researchers at Georgetown Lombardi Comprehensive Cancer Center, part of Georgetown University Medical Center, are conducting a clinical trial to see if the virus can target and kill certain tumor types.

By the age of five, most people have been exposed to the virus, called reovirus. For some, it can trigger brief episodes of coughing or diarrhea while many other don't develop any symptoms. The body simply overpowers the virus. But what scientists have discovered is that the virus grows like gangbusters inside tumor cells with a specific malfunction that leads to tumor growth. That finding led researchers to ask: Is it possible to use the virus as a treatment?

At Lombardi, researchers are collaborating with other institutions to look for an answer by conducting a phase II clinical trial for people with advanced or recurrent non-small cell lung cancer with a specific tumor profile.

"With reovirus, we're able to accentuate the positive and attenuate the negative," says the study's lead investigator at Lombardi, Deepa Subramaniam, MD, interim-chief of the Thoracic Medical Oncology Program. In other words, researchers have genetically altered the virus so that it won't replicate in a healthy cell (attenuated), which is what makes a person sick. "What's left is a virus in search of a host, and reovirus loves the environment inside a specific kind of cancer cell," explains Subramaniam.

That specific kind of cancer cell is one with malfunctioning machinery called KRAS or EGFR mutation.

"These mutations leave the cancer vulnerable to a viral take-over. Once it's in, the reovirus exploits the cell's machinery to drive its own replication. As a result, the cell is filled with virus particles causing it to literally explode."

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Contact: Karen Mallet
km463@georgetown.edu
215-514-9751
Georgetown University Medical Center
Source:Eurekalert

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