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performed cognitive function tests. There were no changes
in the subjects' ability to recall words, numbers, or pictures,
or in their spatial memory, but they were able to make
choices more quickly in one visual test when they were
exposed to simulated mobile phone signals. This was the
only change noted among more than 20 variables
3
compared.
2 In a study of 209 brain tumor cases and 425 matched
controls, there was no increased risk of brain tumors
associated with mobile phone use. When tumors did exist
in certain locations, however, they were more likely to be on
the side of the head where the mobile phone was used.
Because this occurred in only a small number of cases, the
increased likelihood was too small to be statistically
4
significant.
In summary, we do not have enough information at this point to
assure the public that there are, or are not, any low incident
health problems associated with use of mobile phones. FDA
continues to work with all parties, including other federal
agencies and industry, to assure that research is undertaken to
provide the necessary answers to the outstanding questions
about the safety of mobile phones.
What is known about cases of human cancer that
have been reported in users of hand-held mobile
phones?
Some people who have used mobile phones have been
diagnosed with brain cancer. But it is important to understand
that this type of cancer also occurs among people who have not
used mobile phones. In fact, brain cancer occurs in the U.S.
population at a rate of about 6 new cases per 100,000 people
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