In male rats, there was a link between heart tumors and high exposure to cellphone radiation.
Researchers also observed mice in radiation chambers seemed to have a higher risk of DNA damage or heart problems. Based on the NTP's results, as well as hundreds of other studies, the FDA is still confident that the current limits on cellphone radiation are safe, according to a statement from Jeffrey Shuren, the director of the FDA's Center for Devices and Radiological Health.
Researchers at the National Toxicology Program found that there was "some evidence of carcinogenic activity" from cellphone radiation in male rats. The rats received radiation over their entire bodies for nine hours a day for two years.
Medical advice on how to reduce exposure to cell phone radiofrequency radiation can be found at https://ehtrust.org/take-action/educate-yourself/10-things-you-can-do-to-reduce-the-cancer-risk-from-cell-phones/. It cost the FDA $25 million to fund these two long-term studies. But they also lived longer.
High exposure to the type of radiofrequency radiation emitted by mobile phones has been linked to tumours in the hearts of male rats, but not female rats or any mice, according to a draft of United States government studies. We have reviewed the 2016 interim NTP results and are now reviewing the full set of data from the NTP draft final report.
The threat that radiation from wireless devices could be a public health risk only mounts with today's report from the NTP.
"This is the most authoritative study published that connects cancer with mobile phone radiation - it should raise alarms for policymakers and awareness for all people", Olga Naidenko, a senior science advisor for the advocacy organisation Environmental Working Group, said in a statement. And these are at exposure rates that are "much higher" than the current cellphone safety standard, the Food and Drug Administration said. Interestingly, the babies developed to be normal sized and did not show any other developmental defects. Given the inconsistent pattern of the findings, the fact that the subjects were rats and mice rather than people and the high level of radiation used, he said, he could not extrapolate from the data the potential health effects on humans.
"Fortunately, since then, there have been hundreds of studies from which to draw a wealth of information about these technologies which have come to play an important role in our everyday lives".
EWG has been at the forefront of public interest organizations raising concerns about cellphone use and cancer.
The findings add to years of research meant to help settle the debate over whether cellphone radiation is harmful. "Based on this current information, we believe the current safety limits for cellphones are acceptable for protecting the public health". But two government studies released on Friday, one in rats and one in mice, suggest that if there is any risk, it is small, health officials have said.
The study produced some evidence of an increased incidence of brain tumors in male rats, but the data left the NTP scientists with a "lower level of certainty" that exposure to cell phone radiofrequency radiation caused the tumors.