Researchers remain uncertain about safety of mobile devices
A new international study of cellular phone use and brain tumors poses an enigma for epidemiologists. Though researchers found elevated risk for users who talked on average more than 30 minutes a day and had used the devices for more than a decade, moderate cell phone users actually had decreased risk compared with landline callers.
“This study did not confirm or dismiss the possible association between cell phones and brain tumors. That’s the bottom line,” says Siegal Sadetzki of Tel Aviv University’s Sackler School of Medicine.
Sadetzki and colleagues recruited 21,770 participants from 13 countries (not including the United States) as part of the Interphone study. Researchers analyzed risk for two types of brain tumors, meningiomas and gliomas, and found that only gliomas could be linked to cell phone use, and only to heavy use. Even this association was not ironclad, the researchers report online May 17 in the International Journal