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13 6
FDA CONSUMER UPDATE
4. What are the results of the research done already?
The research done thus far has produced conflicting
results, and many studies have suffered from flaws
in their research methods. Animal experiments
investigating the effects of radiofrequency energy
(RF) exposures characteristic of wireless phones have
yielded conflicting results that often cannot be repeated
in other laboratories. A few animal studies, however,
have 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 pre-disposed 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 long-term exposures, since
the average period of phone use in these studies was
around three years.
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