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Health and Safety Information
132
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, gioma, 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.
11.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 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.
12.Which other federal agencies have responsibilities related to
potential RF health effects?