Joe Y. Chang, M.D., Ph.D., (IMAGE) University of Texas M. D. Anderson Cancer Center Caption Joe Y. Chang, M.D., Ph.D., is a professor of Radiation Oncology. Credit MD Anderson Cancer Center 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.