... results show 'clear evidence' of tumor growth after repeated exposure to radiation

• The NIH has been studying the effects of cell phone radiation on rats, mice and people since 1999 
• Cell phones emit radio frequency radiation that allows them to communicate with cell towers 
• Some studies have suggested patterns in development of certain cancers and cell phone use 
• The NIH released preliminary findings in 2016 because rats exposed to high levels of radiation developed certain cancers early on 
• Now, the final results show 'clear evidence' of a link between heart, brain and adrenal gland cancers in male rats  

There is now 'clear evidence' that cell phone radiation can cause cancers of the heart, brain and adrenal glands, a landmark National Institutes of Health (NIH) study warns. 

A final report, released today, confirms the preliminary findings that were released in 2016 after scientists were alarmed by early indications that cell radiation may be carcinogenic.  

Although the tests were done on rodents at levels much higher than humans are currently exposed to, the link between cell phones and cancer in male rats was undeniable.

For female rats and mice of both sexes, the evidence was less clear as to whether cancers observed were associated with signal exposure.

Still, scientists warn that the new research suggests that men in particular should take precautions to minimize the exposure of sensitive areas to cell phone radiation.

A new report from the NIH warns of  'clear evidence' of a link between high levels of cell phone radiation and brain, heart and adrenal cancers in male rats  

Senior scientist Dr John Bucher at the National Toxicology Program (NTP) in Durham, North Carolina said: 'The exposures used in the studies cannot be compared directly to the exposure that humans experience when using a cell phone.

'In our studies, rats and mice received radio frequency radiation (RFR) 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.'

The finding was the result of a $30 million 10-year study to assess the health effects in animals exposed to RFR with modulations used in 2G and 3G cell phones.

The final reports represent the consensus of NTP and a panel of external scientific experts who reviewed the studies in March after draft reports were issued in February.