User's Manual Part 3

Three large epidemiology studies have been published since
December 2000. Between them, the studies investigated any
possible association between the use of wireless phones and
primary brain cancer, glioma, meningioma, or acoustic neuroma,
tumors of the brain or salivary gland, leukemia, or other cancers.
None of the studies demonstrated the existence of any harmful
health effects from wireless phone RF exposures. However, none
of the studies can answer questions about long-term exposures,
since the average period of phone use in these studies was around
three years.
Enter the title of your concept here.
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 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.
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 radiofrequency energy
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