The latest study focusing on a possible cell phone-brain tumor connection finds a weak potential link between the two.

A review of existing research on the topic, published online Oct. 13 in the Journal of Clinical Oncology, discerned no overall link. But when the spotlight was turned on only the more methodologically rigorous studies, a potentially harmful association was found.

Combined with similarly murky conclusions from earlier research, this leaves the world’s four billion cell phone users with no clear indication of what risk, if any, they are taking when they converse on the go.

[Read More]