A much-anticipated but unreleased report from the World Health Organization on a decade-long investigation called Interphone will show a "significantly increased risk" of some brain tumors "related to use of mobile phones for a period of 10 years or more," the London Daily Telegraph reported in late October. The study will be published before the end of the year, the newspaper said.

Supporting that conclusion, a recent study in the Journal of Clinical Oncology that looked at 23 case-control studies found that the research with the more scientifically rigorous methodologies suggested cell phones and tumors are linked. The eight strongest studies made sure the investigators did not know which participants had tumors when they conducted the interviews about cell phone use, and they did not receive funding from industry groups.