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exposure studies could be
completed in a few years.
However, very large numbers
of animals would be needed
to provide reliable proof of
a cancer promoting effect if
one exists. Epidemiological
studies can provide data
that is directly applicable to
human populations, but 10 or
more years follow-up may be
needed to provide answers
about some health effects,
such as cancer.
This is because the interval
between the time of exposure
to a cancer-causing agent and
the time tumors develop - if
they do may be many, many
years. The interpretation of
epidemiological studies is
hampered by difficulties in
measuring actual RF exposure
during day-to-day use of
wireless phones. Many factors
affect this measurement, such
as the angle at which the
phone is held, or which model
of phone is used.
6. What is the FDA doing to
find out more about the
possible health effects of
wireless phone RF?
The FDA is working with
the U.S. National Toxicology
Program and with groups of
investigators around the world
to ensure that high priority
animal studies are conducted
to address important questions
about the effects of exposure
to radiofrequency energy
(RF). The FDA has been a
leading participant in the
World Health Organization
International Electromagnetic
Fields (EMF) Project since
its inception in 1996. An
influential result of this work
has been the development of
a detailed agenda of research
needs that has driven the
establishment of new research
programs around the world.
The project has also helped
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