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Cell phones don't cause cancer, rat study finds

St. Louis, June 25, 2002 Radiation from cell phones doesn't appear to cause cancer in rats, according to a study by researchers at Washington University School of Medicine in St. Louis. The research team exposed rats to the two most common types of cell phone radiation for four hours a day, five days a week for two years.

"We tried to mimic a high level of exposure that humans might experience," says study leader Joseph L. Roti Roti, Ph.D., professor of radiation oncology, of biochemistry and molecular biophysics and of cell biology and physiology.

"We found no statistically significant increases in any tumor type, including brain, liver, lung or kidney, compared to the control group."

Roti Roti will present the findings on June 25 at the Bioelectromagnetic Society meeting in Quebec City, Quebec.

For more than a decade, a public debate has asked whether cell phone radiation causes cancer, particularly brain cancer. Roti Roti's long-term, industry-funded study was undertaken to address that question. The research examined whether chronic exposure to radio frequency (RF) radiation at two common cell phone signals 835.62 megahertz, a frequency used by analogue cell phones, and 847.74 megahertz, a frequency used by digital cell phones caused brain tumors in rats.

The study used 480 male and female rats. One third of the animals were exposed to the analogue cell phone frequency, one-third to the digital frequency and one-third served as controls and received no radiation.

After two years and a total of 505 days of exposure, the brain, spinal cord and other organs from each animal were studied microscopically for signs of cancer.

"We looked specifically for brain and spinal cord tumors," says Marie C. La Regina, D.V.M., a veterinary pathologist with the University's Division of Comparative Medicine and the lead author on the study. "We examined 20 to 25 sections from each brain microscopically, which is more th
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Contact: Darrell E. Ward
wardd@msnotes.wustl.edu
314-286-0122
Washington University School of Medicine
25-Jun-2002


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