Cellphones don’t link to cancer?

A recent study examining 358,403 mobile-phone users in Denmark over an 18-year period has found no correlation between long-term cellphone use and brain cancer.

The study—conducted by researchers from the Danish Cancer Society and the International Agency for Research on Cancer—contradicts a recent World Health Organization determination that cellphones are possibly carcinogenic. Researchers examined data representing the entire Danish population older than 30; people who used cellphones the longest—13 years or more—showed similar cancer rates to those who did not use cellphones.

The researchers maintain the most active cellphone users may still be at higher risk of developing tumors of the brain or central-nervous system as a result of cellphone use, and more study is needed.

As of 2010, there were more than 5 billion cellphone subscribers worldwide.