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 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 

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