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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.
5. What research is
needed to decide
whether RF exposure
from wireless phones
poses a health risk?
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
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