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Male rats exposed to very high levels of the kind of radiation emitted by cellphones developed tumors in the tissues around their hearts, according to a draft report by U.S. government researchers on the potential health risks of the devices.
Female rats and mice exposed in the same way did not develop tumors, according to the preliminary report from the U.S. National Toxicology Program (NTP), a part of the National Institute of Environmental Health Sciences.
Findings - Years - Research - Meant - Debate
The findings add to years of research meant to help settle the debate over whether cellphone radiation is harmful.
Although intriguing, the findings can not be extrapolated to humans, NTP scientists and the U.S. Food and Drug Administration (FDA) said on Friday. They noted that the animal studies were meant to test extreme exposures to cell phone radiation, and that current safety limits on cellphone radiation are protective.
Studies - Assessments - Health - Effects - Exposure
However, the two 10-year, $25 million studies - the most comprehensive assessments of health effects and exposure to radiofrequency radiation in rats and mice to date - do raise new questions about exposure to the ubiquitous devices.
In the studies, about 6 percent of male rats whose entire bodies were exposed to the highest level of cell phone radiation developed schwannomas - a rare type of tumor - in nerve tissue near their hearts, while there were no schwannomas in animals that were not exposed to radiation.
'The - Part - Kind - Tumors - Tumors
'The intriguing part of this is the kind of tumors we saw were similar to tumors noted for quite some time in some epidemiological studies in heavy duty cellphone users,' John Bucher, a senior scientist with NTP, said in a telephone interview.
'Of course, these were in the nerves in the ear and next to the brain, but the tumor types were the same as we saw in the heart.'
Dr - Otis - Brawley - Officer
Dr. Otis Brawley, chief medical officer of the...
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