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Two other studies of interest have been reported recently in
the literature:
1.
Two groups of 18 people were exposed to simulated mobile
phone signals under laboratory conditions while they per-
formed 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 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 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 out-
standing 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 under-
stand 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 each year. At that rate, assuming 80 mil-
lion users of mobile phones (a number increasing at a rate
1.
Preece, AW, Iwi, G, Davies-Smith, A, Wesnes,
K, Butler, S, Lim, E, and Varey, A. Effect of a
915-MHz simulated mobile phone signal on
cognitive function in man. Int. J. Radiat. Biol.,
April 8, 1999.
2.
Hardell, L, Nasman, A, Pahlson, A, Hallquist, A
and Mild, KH. Use of cellular telephones and
the risk for brain tumors: a case-control study.
Int. J. Oncol., 15: 113-116, 1999.
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