Tracer Can Target Tumors (IMAGE) Washington University School of Medicine Caption Hawkins and colleagues have linked anticancer agents to a PET tracer substance to deliver the treatment directly to tumors in mice (red and yellow color shows highest amounts of tracer). Credit none 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.