Ratna B. Ray, Saint Louis University (IMAGE) American Association for Cancer Research Caption Ratna B. Ray, Ph.D., is a professor in the Department of Pathology at Saint Louis University. Credit Ratna B. Ray, Ph.D. 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.