LONDON (AP) -- An international panel of experts says cellphones are possibly carcinogenic to humans after reviewing details from dozens of published studies.
The statement was issued in Lyon, France, on Tuesday by the International Agency for Research on Cancer after a weeklong meeting of experts. They reviewed possible links between cancer and the type of electromagnetic radiation found in cellphones, microwaves and radar.
The agency is the cancer arm of the World Health Organization and the assessment now goes to WHO and national health agencies for possible guidance on cellphone use.
The group classified cellphones in category 2B, meaning they are possibly carcinogenic to humans. Other substances in that category include the pesticide DDT and gasoline engine exhaust.
Last year, results of a large study found no clear link between cellphones and cancer. But some advocacy groups contend the study raised serious concerns because it showed a hint of a possible connection between very heavy phone use and glioma, a rare but often deadly form of brain tumor. However, the numbers in that subgroup weren't sufficient to make the case.
The study was controversial because it began with people who already had cancer and asked them to recall how often they used their cellphones more than a decade ago.
In about 30 other studies done in Europe, New Zealand and the U.S., patients with brain tumors have not reported using their cellphones more often than unaffected people.
Because cellphones are so popular, it may be impossible for experts to compare cellphone users who develop brain tumors with people who don't use the devices.