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Possible Viral Links to Lung Cancer Risk Uncovered
Date:4/25/2008

Two studies find connection between measles, HPV and most common lung cancer

FRIDAY, April 25 (HealthDay News) -- Although smoking is well-established as an independent risk factor for lung cancer, two new studies suggest that two different viral infections might boost a smoker's already substantial risk for developing the disease.

While the specific viruses at issue -- human papillomavirus (HPV) and measles -- may not directly cause lung cancer, they seem to aggravate the negative impact of tobacco, American and Israeli researchers say.

Both findings were presented Friday by separate research teams attending the European Lung Cancer Conference in Geneva.

"In terms of HPV, our finding is pretty controversial," said study author Dr. Arash Rezazadeh, a fellow of medical oncology and hematology at the University of Louisville in Kentucky. "And this is just the beginning of the road. There is much more work to be done. But it's important to know that being infected with this virus does appear to increase lung cancer risk."

As for the role of measles, the second study's lead author, Dr. Samuel Ariad, from the department of oncology at Soroka Medical Center in Beer Sheva, Israel, said that infection -- perhaps even asymptomatic infection -- seems to be associated with half of the lung cancer cases he tracked.

"Measles virus by itself is unlikely to be carcinogenic," he said. "[But] it probably modifies previous damage to DNA caused by smoking."

Both studies specifically focused on the viral impact on non-small cell lung cancer (NSCLC) risk. According to the American Cancer Society, 85 percent to 90 percent of all lung cancers are of this variety. Estimates regarding all forms of lung cancer indicate that 215,000 new cases will be diagnosed in the United States this year alone.

In the HPV study, Rezazadeh and his colleagues analyzed lung tissue samples taken from 23 lung cancer pati
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