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Oncology

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Profiles in Oncology

Prof. Dr. med. Boris Pfaffenbach

Prof. Dr. Boris Pfaffenbach, born in 1962, has been chief physician of the Department of Gastroenterology (Medical Clinic I) at Städtisches Klinikum Solingen since April 2008. He obtained his medical license in 1990 and his doctorate in 1991 from the University of Bonn, became a board-certified internist in 1996 and a gastroenterology specialist in 1997, and earned an additional qualification as a medical quality manager in 2000. His training took him to Essen University Hospital (pathology, 1990-1992), St. Josef Hospital at Ruhr University Bochum (1992-1997), and a senior physician post at Städtisches Klinikum Solingen (1998-2001); from 2002 to 2008 he was chief physician of internal medicine at Bethlehem Hospital Stolberg. He completed his habilitation at Ruhr University Bochum in 1998 and has served as an adjunct professor there since 2003.

Prof. Dr. med. Frank Kolligs

Prof. Dr. Frank Kolligs has been chief physician of the Department of Internal Medicine – Gastroenterology, Hepatology and Diabetology at Helios Klinikum Berlin-Buch since 2015, where he also directs the Interdisciplinary Endoscopy Center and serves as deputy head of the colorectal cancer center. He studied at Philipps University Marburg and completed his specialist training at university hospitals in Marburg, Ann Arbor (Michigan, USA), and Munich; from 2005 to 2009 he was a senior physician, and from 2009 to 2014 lead senior physician, at Medical Clinic II of Munich University Hospital. His research focuses on gastrointestinal tumors and their molecular mechanisms, prevention and early detection strategies, and liver cancer research; clinically he specializes in advanced endoscopic procedures including colonoscopy, gastroscopy, endosonography, and endoscopic resection.

Dr. med. Barbara Strey

Dr. Barbara Strey is chief physician of the Department of Gastroenterology, Hepatology and Endoscopy at Helios St. Johannes Klinik Duisburg, treating disorders of the gastrointestinal tract, liver, and bile ducts using modern endoscopic and interventional techniques. She holds DGVS additional certifications in hepatology and oncological gastroenterology, and is also DGVS-certified in inflammatory bowel disease. In addition to gastroenterology, she oversees the hospital's colorectal cancer center.

Prof. Dr. med. Christian Gerges

Prof. Dr. Christian Gerges is chief physician of Medical Clinic II (Gastroenterology, Gastrointestinal Oncology, Hepatology, Neurogastroenterology and Infectious Diseases) at Helios Klinikum Krefeld, having taken over in 2025 from Prof. Dr. Thomas Frieling, who led the department for nearly 25 years and made it nationally recognized for neurogastroenterology. Born in Mülheim, Gerges studied medicine at Heinrich Heine University Düsseldorf, became a board-certified internist in 2015 and a gastroenterology specialist in 2018, and completed his habilitation at the University of Duisburg-Essen in 2023. A significant part of his clinical training took place at the Evangelical Hospital Düsseldorf, and he most recently headed endoscopy at the Department of Gastroenterology, Hepatology and Transplant Medicine at Essen University Hospital. His focus is on interventional endoscopy, particularly complex procedures for liver and pancreatic disease, endoscopic removal of early gastrointestinal tumors, and treatment of functional swallowing and gastric emptying disorders.

Prof. Dr. med. Patrick Michl

Prof. Dr. Patrick Michl is W3 professor and medical director of the Department of Gastroenterology, Hepatology, Infectious Diseases and Intoxications (Internal Medicine IV) at Heidelberg University Hospital. He studied medicine at Ludwig Maximilian University Munich (1991-1999) with clinical rotations at UCLA and Harvard Medical School, completed his specialist training in internal medicine and gastroenterology at the University of Ulm (2000-2006), and gained further qualifications in infectious diseases and oncological pharmacotherapy in Marburg (2006-2010), where he served as senior consultant until 2015. From 2015 to 2022 he headed internal medicine as W3 professor at Martin Luther University Halle-Wittenberg, and gastroenterology in Heidelberg since 2022. His research focuses on pancreatic diseases, particularly surveillance programs for familial pancreatic cancer; he received the United European Gastroenterology "Rising Star" award (2009) and the Ludwig Heilmeyer Prize (2008), and serves on the board of the European Pancreas Club.

Prof. Dr. med. Thomas Seufferlein

Prof. Dr. Thomas Seufferlein is medical director of the Department of Internal Medicine I (Gastroenterology, Endocrinology, Nephrology, Metabolism/Nutritional Science) at Ulm University Hospital. Following research posts in Berlin and London (1990-1996), he became a board-certified internist in 2000 and a gastroenterology specialist in 2003; from 2008 to 2012 he headed Internal Medicine I at Martin Luther University Halle-Wittenberg, and since May 2012 the Department of Internal Medicine I in Ulm. His research focuses on gastrointestinal oncology and the growth regulation of tumor cells; he leads a laboratory for gastrointestinal growth regulation, chairs the certification committee for colorectal cancer centers, serves as editor-in-chief of the Zeitschrift für Gastroenterologie, and is a past president of the German Cancer Society.

Prof. Dr. med. Jürgen Pohl

Prof. Dr. Jürgen Pohl, born in 1970 in Düsseldorf, is chief physician of the Department of Gastroenterology (GastroClinic) at Asklepios Klinik Altona in Hamburg. He studied medicine at the University of Düsseldorf (1991-1998) and earned his doctorate there in 1998, including a research fellowship at Albert Einstein College of Medicine in New York (1996-1997). After his habilitation at the University of Heidelberg (1997) and an adjunct professorship (2009), he worked in gastroenterology/hepatology at Heidelberg University from 1998 to 2005, as senior physician at Dr. Horst Schmidt Hospital Wiesbaden from 2007 to 2013, and as chief physician at Friedrichshain Hospital Berlin from 2013 to 2015, before taking over gastroenterology at Asklepios Klinik Altona in 2015. His research focuses on diagnostic and interventional endoscopy, particularly endoscopic submucosal dissection for early cancer removal and cholangioscopy. Since 2012 he has served as editor-in-chief of the Video Journal of Gastrointestinal Endoscopy and has made significant contributions to European Society of Gastrointestinal Endoscopy guidelines.

PD Dr. med. Jan-Michel Otte

PD Dr. Jan-Michel Otte is chief physician of the Department of Internal Medicine I (Gastroenterology, Oncology, Infectious Diseases, Diabetology and Metabolic Diseases) at Klinikum Links der Weser (Gesundheit Nord, Bremen). Since October 2023 he has also led Internal Medicine at Klinikum Bremen-Nord in a dual role, being personally on site on set days; as part of a reorganization planned for 2028 he is set to become the long-term chief physician at the Bremen-Nord site.

Prof. Dr. med. Jonas Rosendahl

Prof. Dr. Jonas Rosendahl is a W3 professor of internal medicine with a focus on gastroenterology and heads the University Clinic and Polyclinic for Internal Medicine I (Gastroenterology, Hepatology, Gastroenterological Oncology, Pneumology) at Halle University Hospital. His department is part of the "Liver Transplantation Central Germany" network together with the university hospitals of Magdeburg and Brandenburg and Klinikum Dessau. His research focuses on the early mechanisms underlying the development of gastrointestinal tumors.

Prof. Dr. med. Alexander Meining

Prof. Dr. Alexander Meining is a specialist in internal medicine and gastroenterology and heads the gastroenterology section as deputy clinic director at the Medical Clinic and Polyclinic II of the University Hospital Würzburg. He is a board member of the German Society for Gastroenterology, Digestive and Metabolic Diseases (DGVS). His research focuses on emerging techniques in endoscopic tumor therapy, optimization of diagnostic endoscopy, and interventional endoscopic procedures; he has been regularly listed among Germany's top physicians by Focus magazine since 2016.

Dr. Ursula Ehmer

Dr. Ursula Ehmer is a senior physician and research group leader at the Department of Internal Medicine II, Klinikum rechts der Isar, Technical University of Munich, where she has directed the liver transplantation program since 2017. She studied medicine at Hannover Medical School (1997-2004) and earned her doctorate summa cum laude on hepatic glucuronidation variability and UDP-glucuronosyltransferase polymorphisms, as well as a PhD in Molecular Medicine from the Hannover Biomedical Research School on the regulation of genetic variation. Following clinical training in gastroenterology and hepatology, she conducted postdoctoral research at Stanford University from 2009 to 2012 and completed her habilitation in internal medicine in 2018. Her research focuses on hepatocyte genetics, drug-metabolizing enzymes, cell proliferation control via the Hippo signaling pathway, and the genomics of liver cancer, and she has published extensively on UDP-glucuronosyltransferase regulation, mechanisms of liver disease, and translational cancer research. Her honors include the Ernest and Emilia Gallo Fellowship and a postdoctoral fellowship from the Mildred Scheel Foundation.

Prof. Dr. med. Christoph Michalski

Prof. Dr. med. Christoph Michalski has headed the Department of General, Visceral, and Transplant Surgery at Heidelberg University Hospital since April 1, 2023, succeeding Prof. Dr. Markus W. Büchler. Career: Michalski studied medicine in Heidelberg with stays abroad in England, the USA, and Switzerland. He began as a resident at the Technical University of Munich's pancreatic research lab, completed a fellowship in surgical oncology and transplantation in Portland, USA, and took over as deputy head of transplant surgery at Heidelberg University Hospital in 2014. From 2018 to 2020 he was senior attending physician in Halle (Saale), and from 2020 to 2023 he held the chair for general and visceral surgery in Ulm. Clinical focus: His work centers on complex surgical oncology, minimally invasive and robot-assisted surgery, and transplant medicine, as well as surgery of the pancreas, liver, esophagus, stomach, and intestine. Research: Michalski's research interest lies in "surgical data science" — using operative data to improve therapy, including digital guardrails for surgical robots to reduce risk, as well as AI-supported treatment concepts.

Prof. Dr. Robert Thimme

Prof. Dr. Robert Thimme is Medical Director of the Department of Internal Medicine II (Gastroenterology, Hepatology, Endocrinology, and Infectious Diseases) at University Hospital Freiburg. Career: Thimme completed his doctorate summa cum laude in virology at the University of Freiburg in 1994. From 1998 to 2001 he conducted postdoctoral research at the Scripps Research Institute in California. In 2005 he received a junior professorship for hepatitis virus infections, and in 2009 a Heisenberg professorship (W2/W3) in hepatology. He has served as Medical Director of Internal Medicine II since 2013. Research: Thimme's research focuses on immune responses in hepatitis B and hepatitis C virus infections as well as hepatocellular carcinoma. He coordinates the HEP-CAR consortium and co-chairs the collaborative research center SFB/TRR 179. He also directs the Berta Ottenstein Program for advancing clinical scientists.

Prof. Dr. med. Christian Rust

Prof. Dr. med. Christian Rust is Chief Physician of the Department of Internal Medicine I (Gastroenterology, Hepatology, Oncology, and General Internal Medicine) at Krankenhaus Barmherzige Brüder Munich. His clinical focus spans the full spectrum of hepatological conditions, including viral hepatitis, liver cirrhosis, hepatocellular carcinoma, hemangiomas, and hemochromatosis, as well as nutritional medicine. Beyond the available hospital and directory sources, no detailed public information on his career path or current research projects was found.

Prof. Dr. med. Dr. h. c. Stefan Schreiber

Prof. Dr. med. Dr. h. c. Stefan Schreiber is Director of the Department of Internal Medicine I (Gastroenterology, Hepatology and more) at University Hospital Schleswig-Holstein (UKSH), Kiel Campus, and Director of the Institute of Clinical Molecular Biology. He is spokesperson for the DFG Cluster of Excellence "Precision Medicine in Chronic Inflammation." Career: Born in Berlin in 1962, Schreiber studied at the University of Hamburg, UC San Diego, and Harvard University. After specialty training in Hamburg (1987–1994) he moved to Charité Berlin, where in 1994 he founded a research group on the genetic etiology of inflammatory bowel disease as a senior physician. He completed his habilitation in 1996; since 1998 he has taught at Christian-Albrechts-University Kiel, additionally serving as Dean of the Medical Faculty from 2006 to 2013. Research: Schreiber's research areas include chronic inflammatory barrier diseases, gallstone disease, colorectal cancer, and longevity research. His group made significant discoveries, including disease-causing genes for Crohn's disease and the so-called "aging gene" FOXO3. The clinic he directs operates a certified liver center closely affiliated with liver transplant surgery.

Prof. Dr. med. Tobias Heintges

Prof. Dr. med. Tobias Heintges is Director of the Center for Gastroenterology, Oncology, Pulmonology, Infectious Diseases and General Internal Medicine at Rheinlandklinikum Lukaskrankenhaus Neuss. Since 2012 he has also been an extraordinary member of the Drug Commission of the German Medical Association. Career: Born in Duisburg in 1964, Heintges studied at Heinrich Heine University Düsseldorf from 1984 to 1991 and completed his doctorate on cholecystokinin in 1992. Following his specialty training in internal medicine and gastroenterology, a research fellowship took him to Harvard Medical School from 1996 to 1998. He completed his habilitation in 2001 and was appointed adjunct professor in 2008. Research: Heintges has authored more than 85 scientific publications and served as investigator in around 35 clinical trials on hepatitis, oncology, and infectious disease topics. His clinical focus spans the full range of modern diagnostic and interventional endoscopy as well as oncology of solid tumors.

PD Dr. med. Stefan Heringlake

PD Dr. med. Stefan Heringlake is Chief Physician of Medical Clinic II (Gastroenterology, Oncology, Infectious Diseases and Endoscopy) at Hochtaunus-Kliniken in Bad Homburg. The department covers a broad spectrum of liver diseases (viral hepatitis A–E, liver cirrhosis, liver cancer, autoimmune conditions) as well as gastroenterological oncology and infectious diseases relevant to hepatology. No publicly available information on his detailed career path or current research projects was found; his title of Privatdozent (PD) indicates a completed habilitation, though the topic could not be verified from public sources.

Prof. Dr. med. Hartmut Schmidt

Prof. Dr. med. Hartmut Schmidt is Director of the Department of Gastroenterology and Hepatology at University Hospital Essen and holds the chair of Internal Medicine with a focus on Gastroenterology and Hepatology at the Medical Faculty of the University of Duisburg-Essen. His clinical focus is on gastroenterology, hepatology, and in particular transplant medicine. Career: Schmidt studied medicine in Hannover and conducted research at the National Institutes of Health (NIH) in Bethesda, USA. From 1988 he worked clinically in Hannover, and from 1999 to 2005 as senior physician at Charité Berlin. In 2005 he was appointed professor of Experimental Transplant Hepatology in Münster, where in 2010 he founded his own transplant medicine clinic and held Germany's only chair for transplant medicine, before moving to Essen in 2021. Research: Schmidt has received numerous research awards, including twice from the German Society for Internal Medicine, as well as the Ludolf Brauer Prize and the research award of the German Transplantation Society. He emphasizes the interdisciplinary transplant-medicine focus as forward-looking for hepatology.

Dr. med. German Horn

Dr. German Horn has served as Chief Physician of Gastroenterology at Helios Hanseklinikum Stralsund since April 2024. His clinical focus is on inflammatory bowel disease (Crohn's disease, ulcerative colitis) and gastroenterological oncology. Career: Horn studied medicine at the University of Buenos Aires (1995–2001, graduating with honors) and completed his doctorate summa cum laude in 2005. He received board certification in internal medicine and gastroenterology in 2013. He first served as deputy chief physician at Hanseklinikum Stralsund (2015–2017) before leading internal medicine at Kreiskrankenhaus Demmin from 2017 to 2024. Previously he worked as a senior physician in gastroenterology and as medical director of the emergency department at University Hospital Marburg. Research: At the Institute of Virology at the University of Marburg, Horn founded an interdisciplinary research group on viral gene therapy. He also holds an additional qualification in infectious diseases and specialized training as an ultrasound diagnostics tutor, and serves on the scientific advisory board of the German Crohn's and Colitis Association (DCCV).

Prof. Dr. med. Thomas M. Gress

Director of the Department of Gastroenterology, Endocrinology, Metabolism and Clinical Infectious Diseases at University Hospital Gießen and Marburg (UKGM), Marburg site, since 2006 (W3 professorship). Research assistant at the University of Marburg from 1988, DFG research fellowships in human genetics and at the Imperial Cancer Research Fund London (1989–1991), specialty training in internal medicine/gastroenterology at Ulm University Hospital under Prof. Adler from 1991, board certified 1996, habilitation (venia legendi) 1997, DFG Heisenberg fellow 1998–2001, C3 professorship at the University of Ulm 2001. No in-house liver transplant program at the Marburg site (UKGM transplant center). Research focus: molecular genetics, gastrointestinal oncology and diabetology.

Dr. med. Martin Fuchs

Head physician of the Department of Gastroenterology, Hepatology and Gastroenterological Oncology at München Klinik Bogenhausen (since 2021), with the München Klinik since 1994, previously a research post in Mannheim. Board-certified in internal medicine with subspecialties in gastroenterology and hematology/oncology, additional qualifications in drug-based tumor therapy, palliative care and proctology. Played a key role in founding the interdisciplinary oncology day clinic (2004) and building the DKG-certified oncology center (2014).

Prof. Dr. Volker Ellenrieder

Director of the Department of Gastroenterology, Gastrointestinal Oncology and Endocrinology at Göttingen University Medicine (since April 2014), W3 professorship in internal medicine. Previously W3 endowed professor of the German Cancer Aid at Philipps University Marburg (2012–2014), senior attending physician in Marburg (2006–2012) and attending physician at Ulm University Hospital (2005). Habilitated in Ulm in 2005 on TGFß-regulated transcription in pancreatic cancer. Research focus: signaling and transcriptional pathways in the tumorigenesis of gastrointestinal malignancies, and molecular diagnostics and targeted therapies (molecular tumor board). Awarded the Max Eder Fellowship of the German Cancer Aid (2003–2008), the Hirshberg Research Prize of the European Pancreatic Club (2009) and the Kussmaul Prize (2004).

Prof. Dr. med. Jens Marquardt

Head of the Department of Internal Medicine I at UKSH Campus Lübeck (since November 2019). Studied medicine in Heidelberg, doctorate at the German Cancer Research Center, clinically active until 2008 in gastroenterology and hepatology at University Hospital Cologne. From 2011–2015 research associate at the National Cancer Institute (Bethesda, USA), studying the genetics of liver tumors, then from 2015 senior physician for hepatology and oncology at Mainz University Medicine. Research focus: molecular hepatocarcinogenesis, gastrointestinal oncology, care of patients with liver cirrhosis, and translational and nutritional-medicine research in chronic liver disease and cancer.

Univ.-Prof. Dr. med. Thomas Berg

Head of the Hepatology Division at the Department of Medicine II, Leipzig University Hospital (since 2020). Specializes in viral hepatitis, autoimmune liver disease, liver cirrhosis, liver transplantation and hepatocellular carcinoma. Research focus: causes and mechanisms underlying liver disease and liver cancer with an emphasis on translational research; within the LiSyM-Cancer consortium he coordinates and leads the SMART-NAFLD study and heads the DEEP-HCC project (patient cohorts, sample collection, preclinical research).