PCD CDM2030 Manual Del Usuario página 27

7 Safety and Warranty
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 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 neu-roma, 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 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.
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