Manual Sendo S251 (page 45 of 52) (English)

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RF and FDA/FCC Statements

to humans. Second, many of the studies that

showed increased tumor development used

animals that had already been treated with cancer-

causing chemicals, and other studies exposed the

animals to the RF virtually continuously—up to 22

hours per day.

For the past five years in the United States, the

mobile phone industry has supported research into

the safety of mobile phones. This research has

resulted in two findings in particular that merit

additional study:

1 In a hospital-based, case-control study,

researchers looked for an association between

mobile phone use and either glioma (a type of

brain cancer) or acoustic neuroma (a benign

tumor of the nerve sheath). No statistically

significant association was found between

mobile phone use and acoustic neuroma. There

was also no association between mobile phone

use and gliomas when all types of types of

gliomas were considered together. It should be

noted that the average length of mobile phone

exposure in this study was less than three years.

When 20 types of glioma were considered

separately, however, an association was found

between mobile phone use and one rare type of

glioma, neuroepithelliomatous tumors. It is possible

with multiple comparisons of the same sample that

this association occurred by chance. Moreover, the

risk did not increase with how often the mobile

phone was used, or the length of the calls. In fact,

the risk actually decreased with cumulative hours of

mobile phone use. Most cancer-causing agents

increase risk with increased exposure. An ongoing

study of brain cancers by the National Cancer

Institute is expected to bear on the accuracy and

repeatability of these results

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 abnormalities, including mutations,

chromosomal aberrations, DNA strand breaks,

and structural changes 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 exposure to

simulated cell phone radiation, but only after 24

hours of exposure. It is possible that exposing

the test cells to radiation for this long resulted in

heating. Since this assay is known to be

sensitive to heating, heat alone could have

caused the abnormalities to occur. The data

already in the literature on the response of the

micronucleus assay to RF are conflicting. Thus,

follow-up research is necessary

FDA is currently working with government, industry,

and academic groups to ensure the proper follow-

up to these industry-funded research findings.

Collaboration with the Cellular Telecommunications

Industry Association (CTIA) in particular is

expected to lead to FDA providing research

recommendations and scientific oversight of new

CTIA-funded research based on such

recommendations.

Two other studies of interest have been reported

recently in the literature:

1 Two groups of 18 people were exposed 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

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Sendo S251 Manual

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