Cellphone studies find no new dangers
WASHINGTON» Two government studies that bombarded rats and mice with cellphone radiation found a weak link to some heart tumors, but federal regulators and some scientists say don’t worry — it is safe to use your device. They still do.
Previous studies of cellphone users had found little reason for concern, but the newest research took a closer look at the effects of super-high doses in animals to address some lingering questions that could not be tested on humans.
The rat study released Friday found a small increase in an unusual type of heart tumor in male rats, but there were no significant problems in female rats or in a separate study of mice. In particular, scientists could not find hard evidence for concern about brain tumors.
The lead author of the research, John Bucher of the National Institute of Environmental Health Sciences, is not changing his cellphone use or advising his family to.
“I am actually holding my cellphone up to my ear,” Dr. Otis Brawley, the American Cancer Society’s chief medical officer, said in an interview after reading the studies.
The rodent studies do not reflect real-life cellphone use, he cautioned.
“These draft reports are bound to create a lot of concern, but in fact they won’t change what I tell people. The evidence for an association between cellphones and cancer is weak. And so far, we have not seen a higher cancer risk in people. But if you’re concerned about this animal data, wear an earpiece.”
The findings about the rare nerve-tissue tumor discovered in the hearts of male rats do not translate directly into a concern for humans, Bucher stressed.
Bucher’s agency conducted the $25 million study at the behest of the Food and Drug Administration, which quickly said cellphones are safe.
“The current safety limits for cellphones are acceptable for protecting the public health,” FDA radiation health chief Dr. Jeffrey Shuren said in a statement.
Bucher said typical cellphone use is “very, very, very much lower than what we studied.”
Rats and mice were bombarded for nine hours a day for up to two years with a radiation level so high that humans would only experience it briefly, such as when a phone with a weak signal expends more energy searching for a stronger one, Bucher said at a news conference.
“At best it might be a weak carcinogen ... if in fact it is a carcinogen,” he said.
Confusingly, the radiated rats somehow lived longer than comparison rats that were not exposed to cellphone radiation. Bucher said that could be just chance, or it could be that the radiation reduced inflammation in the rats, which in turn decreased the risk of a rat disease.