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Important Information 243
increased likelihood was too small to be statistically
significant.
4
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
each year. At that rate, assuming 80 million users of mobile
phones (a number increasing at a rate of about 1 million per
month), about 4800 cases of brain cancer would be expected
each year among those 80 million people, whether or not they
used their phones. Thus it is not possible to tell whether any
individual’s cancer arose because of the phone, or whether it
would have happened anyway. A key question is whether the risk
of getting a particular form of cancer is greater among people
who use mobile phones than among the rest of the population.
One way to answer that question is to compare the usage of
mobile phones among people with brain cancer with the use of
mobile phones among appropriately matched people without
brain cancer. This is called a case-control study.
The current case-control study of brain cancers by the National
Cancer Institute, as well as the follow-up research to be
sponsored by industry, will begin to generate this type of
information.