Study: Links between cell phones, cancer unclear

May 16, 2010 The World Health Organization study surveyed 13,000 people and found cell phone use did not increase risk for developing a common type of benign tumor known as meningioma or a deadlier form of cancer called glioma.

The study's authors say data suggests heavy cell phone use, defined as more than 30 minutes per day, might increase the risk of glioma, but other factors cast doubt on the cause of the cancer.

The study will be published in the International Journal of Epidemiology.