A long-running US study on the effects of radio wave radiation, the sort emitted by mobile phones, has found “clear eence” of high levels of exposure and heart cancers in male rats.
Some eence of links to brain and adrenal gland tumours was also found in male rats, but in female rodents and male mice signs of cancer weren’t clear, the National Toxicology Programme (NTP) concluded in its final report on Thursday.
The programme is run by the US Department of Health and Human Services and was tasked with reviewing the toxicity of mobile phone radiation in response to the devices’ near ubiquity in modern life.
Radiation exposure in the trial was well above the levels most humans would experience, but researchers said the findings show the link between radio frequencies and tumours – at least for rats – “is real”.
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“The exposures used in the studies cannot be compared directly to the exposure that humans experience when using a cell phone,” said Dr John Bucher, a senior scientist at the NTP.
“In our studies, rats and mice received radio frequency radiation across their whole bodies. By contrast, people are mostly exposed in specific local tissues close to where they hold the phone.
“In addition, the exposure levels and durations in our studies were greater than what people experience.”
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But he added: “We believe that the link between radio frequency radiation and tumours in male rats is real, and the external experts agreed.”
The studies took a decade to complete and cost more than $30m (£23m) to run. The animals’ tissues were combed over for signs of tumours after experiencing nine hours a day of radiation for most of their natural lives, beginning in the womb in the case of the rats.
This is the most controlled study on exposure to date, and it raises many questions about the conclusions for humans – particularly as the lowest exposure levels were at the maximum levels allowed for mobile phones.
The group found male rats had a higher incidence of heart tumours, compared to the control rats not exposed to radiation, but radiated male rats also lived longer – apparently due to fewer kidney problems.
In female rats and both sets of mice, the eence of any cancers formed was described as “equivocal”, meaning there were measurable increases in molecules sometimes linked to cancer but no actual eence.
The study also focussed on 2G and 3G wireless signals, the most widely used types when the study began, but the researchers say their findings are still relevant today as most mobile phones still use these bands alongside wifi and 4G.
