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Dive into the research topics where Frank Hummel is active.

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Featured researches published by Frank Hummel.


European Journal of Gastroenterology & Hepatology | 2009

Properties of different pancreatin preparations used in pancreatic exocrine insufficiency.

Johannes-Matthias Löhr; Frank Hummel; Konstantinos T. Pirilis; Gregor Steinkamp; Andreas Körner; Friederike Henniges

Background Pancreatic enzyme preparations are a life-saving substitution for a pivotal physiological function of the entire organism that is impaired in chronic pancreatitis, cystic fibrosis and other diseases with exocrine pancreatic insufficiency. Pancreatic enzyme preparations, generically called pancreatin, are not alike. Rather, they present a broad variety of pancreatin composition. Aim The properties of a set of commercially available pancreatin preparations were investigated in light of the physiological tasks such enzymes must fulfill during the normal digestive process. Methods Measurements of size, surface, acid resistance, release of enzymes, pharmacokinetics and batch consistency were undertaken. Results Although all pancreatin preparations contain the declared lipase units and are acid-stable, a wide variation was observed in the particle size (pyloric passage), specific surface area and release kinetics of lipase activity at pH 6 (duodenum). Conclusion At present, available pancreatin preparations vary widely with respect to investigated parameters, which may have consequences for facilitating optimal digestion.


Scandinavian Journal of Gastroenterology | 2010

Comparison of magnetic resonance imaging and video capsule enteroscopy in diagnosing small-bowel pathology: localization-dependent diagnostic yield.

Ulrich Böcker; Dietmar Dinter; Caroline Litterer; Frank Hummel; Phillip Knebel; Andreas Franke; Christel Weiss; Manfred V. Singer; J.-Matthias Löhr

Abstract Objective. New technology has considerably advanced the diagnosis of small-bowel pathology. However, its significance in clinical algorithms has not yet been fully assessed. The aim of the present analysis was to compare the diagnostic utility and yield of video-capsule enteroscopy (VCE) to that of magnetic resonance imaging (MRI) in patients with suspected or established Crohns disease (Group I), obscure gastrointestinal blood loss (Group II), or suspected tumors (Group III). Material and methods. Forty-six out of 182 patients who underwent both modalities were included: 21 in Group I, 20 in Group II, and five in Group III. Pathology was assessed in three predetermined sections of the small bowel (upper, middle, and lower). The McNemar and Wilcoxon tests were used for statistical analysis. Results. In Group I, lesions were found by VCE in nine of the 21 patients and by MRI in six. In five patients, both modalities showed pathology. In Group II, pathological changes were detected in 11 of the 20 patients by VCE and in eight patients by MRI. In five cases, pathology was found with both modalities. In Group III, neither modality showed small-bowel pathology. For the patient groups combined, diagnostic yield was 43% with VCE and 30% with MRI. The diagnostic yield of VCE was superior to that of MRI in the upper small bowel in both Groups I and II. Conclusion. VCE is superior to MRI for the detection of lesions related to Crohns disease or obscure gastrointestinal bleeding in the upper small bowel.


Pancreatology | 2004

Poorly Differentiated Small Cell Carcinoma of the Pancreas

Simone Berkel; Frank Hummel; Jochen Gaa; Walter Back; Ralf Hofheinz; Wolfgang Queisser; Manfred V. Singer; Matthias Löhr

Small cell carcinoma (SCC) of the pancreas is a rare malignancy with an extremely poor prognosis. We present the case of a 74-year-old man with a 2-month history of upper abdominal discomfort who was diagnosed with SCC of the pancreas tail, involvement of peripancreatic and mesenteric lymph nodes and multiple liver metastases (extended disease). A CT scan and a positive somatostatin receptor scintigraphy showed no evidence of a primary lung tumour. The diagnosis of a SCC was confirmed by biopsy. Local tumour control could be achieved by gemcitabine once a week and a long-acting somatostatin analogue once a month, but liver metastasis showed progress. Thus, 5-fluorouracil on a weekly basis was started. The patient died 8 months after diagnosis and had not been hospitalised in the meantime.


Visceral medicine | 2005

Die Kapselendoskopie in der Diagnostik der intestinalen Blutung

Frank Hummel; J.-Matthias Löhr; Manfred V. Singer

Für die Diagnostik gastrointestinaler Blutungen unklarer Lokalisation nach unauffälliger Gastroskopie und Koloskopie steht seit einigen Jahren die Kapselendoskopie als neue bildgebende Methode zur Verfügung. Sie ist mittlerweile als wichtiges diagnostisches Mittel anerkannt, nachdem mehrere kontrollierte und randomisierte Studien ihre Überlegenheit als Methode der ersten Wahl insbesondere im Vergleich mit der Push-Enteroskopie zeigen konnten. Ihre Vorteile sind die hohe Findungsrate für Blutungsquellen und die für den Patienten schonende Untersuchungstechnik. Als Nachteile sind hohe Kosten und fehlende Interventions- bzw. Biopsiemöglichkeiten zu werten. Zur Optimierung der Untersuchungsvorbereitung liegen erste Studien vor. Die Kapselendoskopie ist aus derzeitiger Sicht die Methode der ersten Wahl zur Lokalisationsdiagnostik bei gastrointestinaler Blutung nach vorausgegangener unauffälliger Ösophagogastroskopie und Koloskopie im Sinne einer Portaluntersuchung zur Festlegung des weiteren Prozedere.


Archive | 2003

Früherkennung bei Tumoren des Verdauungstraktes

Frank Hummel; Matthias Löhr; Jörg Ringel; Anne Rühl

Die Fruherkennung maligner gastrointestinaler Tumoren erfolgt endoskopisch durch den Nachweis intraluminaler Raumforderungen und deren gezielter Biopsie. Hierbei kommt insbesondere den modernen hochauflosenden videoendoskopischen Verfahren, moglicherweise zusammen mit dem intravitalen Nachweis histologischer Veranderungen bei der Chromoendoskopie, wachsende Bedeutung zu; zur Zeit ist die Wertigkeit der Chromoendoskopie bei der Fruherkennung maligner Tumoren des Verdauungstraktes allerdings noch umstritten.


Onkologie | 2001

Gentherapie des Pankreaskarzinoms mit mikroverkapselten, CYP2B1-exprimierenden Zellen

Matthias Löhr; Grit Faulmann; Frank Hummel; Manfred V. Singer

Gene Therapy of Pancreatic Cancer with Microencapsulated CYP2B1-Expressing Cells Als Gentherapie bezeichnet man gewöhnlich den Transfer von neuem genetischen Material in Zielzellen des Organismus (Patienten) mit therapeutischer Intention. In der Praxis wird diese Definition häufig durch die Vereinnahmung der therapeutischen Vakzination und Zelltherapie erweitert. Dabei werden nicht autologe, sondern heterologe Zellen, welche das therapeutische Gen tragen, eingesetzt. Konzeptionell bietet dieses Vorgehen verschiedene Vorteile. Diese bestehen im kontrollierten Einbringen der Produktionsstätte der therapeutischen Moleküle (virale Vektoren, Antikörper, Zytokine) bei gleichzeitiger Minimierung des «spill over» in die systemische Zirkulation des Empfängers [1]. ...


World Journal of Gastroenterology | 2006

Expression of tissue factor in pancreatic adenocarcinoma is associated with activation of coagulation

Stephan L. Haas; Ralf Jesnowski; Michael Steiner; Frank Hummel; Jörg Ringel; Christine Burstein; Horst Nizze; Stefan Liebe; J.-Matthias Löhr


Cancer Chemotherapy and Pharmacology | 2002

Microencapsulated, CYP2b1-transfected cells activating ifosfamide at the site of the tumor: the magic bullets of the 21st century

Matthias Löhr; Frank Hummel; Grit Faulmann; Jörg Ringel; Robert Saller; Johannes Hain; Walter H. Günzburg; Brian Salmons


World Journal of Gastroenterology | 2008

Prospective evaluation of small bowel preparation with bisacodyl and sodium phosphate for capsule endoscopy

Andreas Franke; Frank Hummel; Phillip Knebel; Christoph Antoni; Ulrich Böcker; Manfred V. Singer; Matthias Löhr


Hepato-gastroenterology | 1999

Serum levels of extracellular matrix in acute pancreatitis.

Matthias Löhr; Frank Hummel; Martus P; Cidlinsky K; Jens-Christian Kröger; E. G. Hahn; Oesterling C; Jörg Emmrich; Schuppan D; Stefan Liebe

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J.-Matthias Löhr

Karolinska University Hospital

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Isaac Samuel

Roy J. and Lucille A. Carver College of Medicine

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