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Published on: 11/7/2005
Last Visited: 9/14/2008
I don't say, 'I think I'll have a little less Epstein-Barr virus today,' " said Dr. Julie Parsonnet, a researcher at Stanford Comprehensive Cancer Center in California who focuses on infectious diseases."We are probably focusing on the wrong thing."
Ultimately, Parsonnet believes that infections from viruses and bacteria combined account for at least a quarter of cancers and more in developing countries where untreated infections are more common.
However, Parsonnet hopes the advent of the vaccine against cervical cancer, Gardasil, in 2006, may have begun to raise awareness.The maker, Merck & Co., ran national television advertisements that depicted average women expressing their surprise that cancer could be brought on by a viral infection."That for the first time brought infections to the public mind as a cause of cancer," Parsonnet said.
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Scientists don't know why different viruses are so selective in causing cancer, but Parsonnet believes the answer lies in the complex relationship between humans and the viruses inside them.The difference between a harmless virus and a deadly infection, she said, may come down to very specific details, or a cascade of unconnected events."Maybe herpes causes cancer but only if you previously had CMV (cytomegalovirus) and an exposure to hepatitis A before you were three," she speculated.