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suggested that low levels of RF could accelerate the
development of cancer in laboratory animals. However,
many of the studies that showed increased tumor
development used animals that had been genetically
engineered or treated with cancer causing chemicals so
as to be predisposed to develop cancer in the absence
of RF exposure. Other studies exposed the animals to
RF for up to 22 hours per day. These conditions are
not similar to the conditions under which people use
wireless phones, so we don’t know with certainty what the
results of such studies mean for human health. 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
longterm 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
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
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