Motorola MICROTAC DPC 650 Owner's Manual download pdf (Page 74)

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conflicting results. A few animal studies, however, have sug-

gested 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 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 possi-

ble 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 abnormali-

ties, 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 simulat-

ed cell phone radiation, but only after 24 hours of exposure.

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