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A combination of laboratory studies and epidemiological
studies of people actually using wireless phones would
provide some of the data that are needed. Lifetime
animal 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
ten 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.
What is FDA doing to find out more about
the possible health effects of wireless
phone RF?
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 radio frequency energy
(RF).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 documents on EMF issues.FDA and
Cellular Telecommunications & Internet Association
(CTIA) have a formal Cooperative Research and
Development Agreement (CRADA) to do research on
wireless phone safety. FDA provides the scientific
oversight, obtaining input from experts in government,
industry, and academic organizations. CTIA-funded
research is conducted through contracts to independent
investigators. The initial research will include both
laboratory studies and studies of wireless phone users.
The CRADA will also include a broad assessment of
additional research needs in the context of the latest
research developments around the world.
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