Affiliation: | 1 Gastrointestinal Malignancy Section, Medical Oncology Branch, National Cancer Institute, Bethesda, USA;2 Department of Gastroenterology, Hepatology and Endocrinology, Hannover Medical School, Hannover, Germany;3 Laboratory of Pathology, National Cancer Institute, NIH, Bethesda, USA;4 Department of Gastroenterology, University of Tübingen, Tübingen, Germany;5 Experimental Transplantation and Immunology Branch, NIH, Bethesda, USA;6 Division of Medical Oncology, Department of Medicine, Stanford University, CA, USA |