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Washington — A new federal study of the potential dangers of cellphone radiation, conducted in rats, found a slight increase in brain tumors in males and raised long-dormant concerns about the safety of spending so much time with cellphones glued to our ears.

But the study had enough strange findings that it has caused other federal scientists to highlight flaws in the research, and experts said these findings and those from other studies continue to suggest the potential risk from cellphone radiation is very small.

The National Institutes of Health study bombarded rats with cellphone radiation from the womb through the first two years of life for nine hours a day. It found tumors in 2 to 3 percent of male rats, which the study’s authors called low. But females weren’t affected at all and, strangely, the rats not exposed to the cellphone radiation died much faster — at double the rate — of those that were.

The results were preliminary, and only part of what will ultimately be released. They were made public before they were officially published — and despite strong criticism from other NIH scientists — because the results were similar to other studies that hint at a potential problem, said study author John Bucher.

The study is part of a seven-year, $25 million effort conducted by the National Toxicology Program at the request of the Food and Drug Administration. It looked at the specific type of radiation that cellphones transmit, called non-ionizing radiofrequency.

“This is the first study to actually show that non-ionizing radiation (causes) cancer,” said Dr. Otis Brawley, the American Cancer Society’s chief medical officer.

“If cellphones cause cancer, they don’t cause a lot of cancer,” he said in an interview. “It’s not as carcinogenic as beef.”

He said people should be far more concerned about “distraction caused by cellphone,’” which he said causes more deaths.

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