Audiovox CDM-9100 manual

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 consid- ered 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, how- ever, 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 ex- pected to bear on the accuracy and repeatability of these re- sults.1

2.Researchers conducted a large battery of laboratory tests to assess the effects of exposure to mobile phone RF on ge- netic material. These included tests for several kinds of ab- normalities, 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 as- say, which detects structural effects on the genetic material. The cells in this assay showed changes after exposure to simu- lated 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 sen- sitive to heating, heat alone could have caused the abnor- malities to occur. The data already in the literature on the re-

sponse of the micronucleus assay to RF are conflicting. Thus, follow-up research is necessary.2

FDA is currently working with government, industry, and aca- demic groups to ensure the proper follow-up to these indus- try-funded research findings. Collaboration with the Cellular Telecommunications & Internet Association (CTIA) in particu- lar is expected to lead to FDA providing research recommen- dations 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 per- formed 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 simu-

lated mobile phone signals. This was the only change noted among more than 20 variables compared.3

1Muscat et al. Epidemiological Study of Cellular Telephone Use and Malignant Brain Tumors. In: State of the Science Symposium;1999 June 20; Long Beach, California.

2Tice et al. Tests of mobile phone signals for activity in genotoxicity and other laboratory assays. In: Annual Meet- ing of the Environmental Mutagen Society; March 29, 1999, Washington, D.C.; and personal communication, unpub- lished results.

3Preece, AW, Iwi, G, Davies-Smith, A, Wesnes, K, Butler, S, Lim, E, and Varey, A. Effect of a 915-MHz simulated mobile phone signal on cognitive function in man. Int. J. Radiat. Biol., April 8, 1999.

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