Mobile phones don't definitely cause cancer, but the research that leads to that conclusion may be flawed, say researchers who have gone through 23 controlled studies on the issue.
Researchers at South Korea's National Cancer Centre found that the "methodologic quality" and therefore bias of the studies varied widely. Those that found mobiles posed less risk tended to have lower "quality" and therefore more bias. Those with more "quality" tended to suggest there was a link, they said in a study for the US Centers for Disease Control and Prevention published in the Journal of Clinical Oncology yesterday.
There is a 2% greater chance that a mobile phone user will develop a malignant or a benign tumors, compared to a non-phone user, the researchers said.
Based on the low bias, case controlled studies, there was possible evidence linking mobile phone use to an increased risk of tumors, they said.