On May 31, the World Health Organization (WHO) placed cell phones on a list of 266 items that may cause cancer in human beings. Yet a study published this week in the Journal of the National Cancer Institute would seem to reassure parents that kids who use cell phones are at no heightened risk of developing brain cancer. The study concluded, "Regular users of mobile phones were not statistically significantly more likely to have been diagnosed with brain tumors compared to nonusers."
This study surveyed 352 kids with brain tumors between 2004 and 2008, who the researchers concluded were "regular cell phone users." The kids lived in Denmark, Sweden, Norway and Switzerland. The catch? The researchers' definition of a "regular user" was one mobile phone call a week for at least six months. The researchers did not look at exposure time using call duration. Defining a "regular cell phone user" as once a week for at least six months is very low. According to a Pew Research Center study released in 2010, U.S. "teens typically make or receive five calls a day. White teens typically make or receive four calls a day, or around 120 calls a month, while black teens exchange seven calls a day or about 210 calls a month and Hispanic teens typically make and receive five calls a day or about 150 calls a month."
So they didn't find an increase between the "regular user" group and the control group. But based on their definition of a regular user, it's unlikely that they would. Also because, as noted by the National Cancer Institute, "The interval between exposure to a carcinogen and the clinical onset of a tumor may be many years or decades." That means if a 13-year-old starts using a cell phone on a daily basis in 2011, it will be years or decades before any damaging evidence is seen. Very few people believe talking on the phone once a week for six months will cause brain cancer. But for teens who are using their cell phones in a more typical fashion – at least five times per day- the answer is less clear.
(image via: http://www.zomm.com/)