Cell phone users worried about getting brain cancer aren't off the hook yet.
A major international study into the link between cell phone use and two types of brain cancer has proved inconclusive, according to a report due to be published in a medical journal on 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.
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