Dr. Stephan Grupp (IMAGE) Children's Hospital of Philadelphia Caption Stephan Grupp, MD, PhD, is director of the Cancer Immunotherapy Program at Children's Hospital of Philadelphia Credit Children's Hospital of Philadelphia 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.