LG LG870 - Manual (Page 105)

105
Safety
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 do not 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.
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 - 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.