User's Manual

E-13
k 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.