Bedienungsanleitung Siemens S46 (Seite 101 von 111) (Englisch)

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2.10.02 10-S46 FDA.fm i 37 Am Engl, A31008-H5450-A5-2-4A19

U.S. FDA

How much evidence is there that hand-held mobile phones might be harmful?

Briefly, there is not enough evidence to know for sure, either way; however,

research efforts are on-going. The existing scientific evidence is conflicting

and many of the studies that have been done to date have suffered from

flaws in their research methods. Animal experiments investigating the effects

of RF exposures characteristic of mobile phones have yielded conflicting

results. A few animal studies, however, have suggested that low levels of RF

could accelerate the development of cancer in laboratory animals. In one

study, mice genetically altered to be predisposed to developing one type of

cancer developed more than twice as many such cancers when they were

exposed to RF energy compared to controls. There is much uncertainty

among scientists about whether results obtained from animal studies apply

to the use of mobile phones. First, it is uncertain how to apply the results

obtained in rats and mice to humans. Second, many of the studies 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 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.

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