The head of a cancer research center is urging his faculty and staff to limit their cell phone use.

Dr. Ronald Herberman of the University of Pittsburgh Cancer Institute is worried about the possible risk of brain cancer. He says there's a "growing body of literature" linking long-term cell phone use with adverse health effects, including cancer. He's basing his warning on early, unpublished data.

Herberman is urging his faculty and staff to keep cell phones
away from their heads, and use the speakerphone or a wireless
headset. He says children should use cell phones only for
emergencies.

Other researchers point to numerous studies which have found no
link between cell phone use and brain tumors. The Food and Drug
Administration says if there is a risk it's probably very small.