GENEVA — A major international study into the link between cell phone use and two types of brain cancer has proved inconclusive, according to a report being published in a medical journal Tuesday.
A 10-year survey of almost 13,000 participants found most cell phone use didn’t increase the risk of developing meningioma — a common and frequently benign tumor — or glioma — a rarer but deadlier form of cancer.
There were “suggestions” that using cell phones for more than 30 minutes each day could increase the risk of glioma, according to the study by the World Health Organization’s International Agency for Research on Cancer. But the authors added that “biases and error prevent a causal interpretation” that would directly blame radiation for the tumor.
Longer call times appeared to pose a greater risk than the number of calls made, the study found.
Among the factors that weren’t examined were the effects of using handsfree devices during calls or the risk of having cell phones close by while not making calls — such as in a pocket, or next to the bed at night.
The authors acknowledged possible inaccuracies in the survey from the fact that participants were asked to remember how much and on which ear they used their mobiles over the past decade. Results for some groups showed cell phone use actually appeared to lessen the risk of developing cancers, something the researchers described as “implausible.”
Scientists are also planning to examine whether cell phone use increases the risk of tumors in the ear’s acoustic nerve and the parotid gland, where saliva is produced. A separate study will look into the effects of cell phone use on children, who are believed to be more susceptible to the effects of radiation.
The paper, which will be published in the International Journal of Epidemiology, was compiled by researchers in 13 countries including Britain, Canada, France, Germany and Japan, but not the U.S. Scientists interviewed 12,848 participants, of which 5,150 had either meningioma or glioma tumors.
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