User Manual

Withus. Cdma UI.
2000. 10. - 75 - Make by Withus. Cdma Team
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 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 me rit additional study:
1.In a hospital-based, case-control study, researchers looked for an association between mobile phone useand 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 neuronal.
There was also no association between mobile phone use and glooms when all types of types of glooms 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 gloom were considered separately, however, an association was found between mobile phone use and
one rare type of gloom, neuroepithellio matous 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 tobear on the accuracy and repeatability of these results.2
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: