Baldassarre Stea, University of Arizona Health Sciences (IMAGE) University of Arizona Health Sciences Caption Baldassarre Stea, MD, PhD, (center), treats brain tumors with DNA-damaging radiation. Credit Anna C. Christensen Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.