Dennis Kothmann, UT Southwestern (IMAGE) UT Southwestern Medical Center Caption Dennis Kothmann prepares to receive his latest infusion of a medication designed to help his immune system fight brain cancer. The 71-year-old retired math teacher was diagnosed last fall with glioblastoma and opted to help test the experimental treatment rather than undergo chemotherapy. Credit UT Southwestern 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.