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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 develop a
series of public information
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