Siemens S75 Manual page 135

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2. Researchers conducted a large
battery of laboratory tests to assess
the effects of exposure to mobile
phone RF on genetic material. These
included tests for several kinds of ab-
normalities, including mutations,
chromosomal aberrations, DNA
strand breaks, and structural chang-
es in the genetic material of blood
cells called lymphocytes. None of
the tests showed any effect of the RF
except for the micronucleus assay,
which detects structural effects on
the genetic material. The cells in this
assay showed changes after expo-
sure to simulated cell phone radia-
tion, but only after 24 hours of expo-
sure. It is possible that exposing the
test cells to radiation for this long re-
sulted in heating. Since this assay is
known to be sensitive to heating,
heat alone could have caused the ab-
normalities to occur. The data al-
ready in the literature on the re-
sponse of the micronucleus assay to
RF are conflicting. Thus follow-up re-
search is necessary.
FDA is currently working with govern-
ment, industry, and academic groups
to ensure the proper follow-up to
these industry-funded research find-
ings. Collaboration with the Cellular
Telecommunications Industry Associ-
ation (CTIA) in particular is expected
to lead to FDA providing research rec-
ommendations and scientific over-
sight of new CTIA-funded research
based on such recommendations.
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U.S. FDA
Two other studies of interest have
been reported recently in the
literature:
• Two groups of 18 people were ex-
posed to simulated mobile phone
signals under laboratory conditions
while they performed cognitive
function tests. There were no
changes in the subjects' ability to
recall words, numbers, or pictures,
or in their spatial memory, but they
were able to make choices more
quickly in one visual test when
they were exposed to simulated
mobile phone signals. This was the
only change noted among more
than 20 variables compared.
• In a study of 209 brain tumor cas-
es and 425 matched controls,
there was no increased risk of
brain tumors associated with mo-
bile phone use. When tumors did
exist in certain locations, howev-
er, they were more likely to be on
the side of the head where the
mobile phone was used. Because
this occurred in only a small
number of cases, the increased
likelihood was too small to be sta-
tistically significant.
In summary, we do not have enough
information at this point to assure the
public that there are, or are not, any
low incident health problems associ-
ated with use of mobile phones. FDA
continues to work with all parties, in-
cluding other federal agencies and in-
dustry, to assure that research is un-
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