Cell Phone Risks Study - Results
A more recent study, published in the British Journal of Medicine ("online first", January 20, 2006) investigates the connection between cell-phone use and glioma - a type of brain cancer. The study compared 966 people aged 18 to 69 diagnosed with glioma over a three-year period, with 1716 randomly selected controls from physicians lists.
The study did not find any correlation - the Relative Risk of glioma for cell phone users is 0.94, with a Margin of Error between 0.78 and 1.13. The lack of correlation was regardless of the duration of use, lifetime years of use, or other variables. The only correlation found was between the side of the cell-phone use and the side of the tumor. There was an increased risk of having a tumor on the same side as the cell-phone use (ipsilateral - 1.24, Margin of Error between 1.02 and 1.52) that the authors of the study assign to a "recall bias". This bias implies that people with tumors tend to "remember" using their cell-phone on the side of the tumor. People tend to use their cell-phone with their dominant hand. When the correlation between people's "handedness" and the tumor side was determined, no correlation was found!
Another, more recent study, published in the Journal of the National Cancer Institute 2009 v101, p1721 tracks the number of brain cancers in the Scandinavian population, as the use of cell phones dramatically increased. This type of study was originally used to show a connection between cigarette smoking and lung cancer. However, here no such correlation was found, after analyzing almost 60,000 cases of brain cancer patients.