Rick Spurr (IMAGE) UT Southwestern Medical Center Caption Rick Spurr, former CEO of Zix, volunteered for the study that showed individuals with certain types of bacteria in their gut may be more likely to respond well to cancer immunotherapy. 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.