2024

• Resell, Mathilde Victoria; Stranden, Morten; Qvigstad, Gunnar; Chen, Duan; Zhao, Chun Mei. (2024) Gaps between needs of patient and public involvement and interests of researchers on pancreatic cancer. Patient Education and Counseling
  Academic article

2022

• Beck, Marianne; Bringeland, Erling Audun; Qvigstad, Gunnar; Fossmark, Reidar. (2022) Ventrikkelcancer oversett ved gastroskopi i Midt-Norge 2007-2016 – En populasjonsbasert studie. NGF-nytt
  Article in business/trade/industry journal
• Melis, Claudia; Pertoldi, Cino; Ludington, William Basil; Beuchat, Carol; Qvigstad, Gunnar; Stronen, Astrid Vik. (2022) Genetic Rescue of the Highly Inbred Norwegian Lundehund. Genes
  Academic article
• Fossmark, Reidar; Johannessen, Rune; Qvigstad, Gunnar; Mjønes, Patricia. (2022) Do Gastric Signet Ring Cell Carcinomas and ECL-Cell Neuroendocrine Tumours Have a Common Origin?. Medicina
  Short communication

2021

• Kylänpää, Leena; Koskensalo, Vilja; Saarela, Arto; Ejstrud, Per; Udd, Marianne; Lindström, Outi. (2021) Transpancreatic biliary sphincterotomy versus double guidewire in difficult biliary cannulation: A randomized controlled trial. Endoscopy
  Academic article
• Beck, Marianne; Bringeland, Erling A.; Qvigstad, Gunnar; Fossmark, Reidar. (2021) Gastric cancers missed at upper endoscopy in central norway 2007 to 2016—a population-based study. Cancers
  Academic article

2019

• Haraldsson, Erik; Kylanpää, Leena; Grönroos, Juha; Saarela, Arto; Toth, Ervin; Qvigstad, Gunnar. (2019) Macroscopic appearance of the major duodenal papilla influences bile duct cannulation: a prospective multicenter study by the Scandinavian Association for Digestive Endoscopy Study Group for ERCP. Gastrointestinal Endoscopy
  Academic article

2017

• Mjønes, Patricia; Nordrum, Ivar Skjåk; Qvigstad, Gunnar; Sørdal, Øystein Finset; Rian, Liselotte Linnea Mårtensson; Waldum, Helge. (2017) Expression of erythropoietin and neuroendocrine markers in clear cell renal cell carcinoma. APMIS : Acta pathologica, microbiologica et immunologica Scandinavica. Supplementum
  Academic article
• Vange, Pål; Bruland, Torunn; Doseth, Berit; Fossmark, Reidar; Sousa, Mirta; Beisvag, Vidar. (2017) The cytoprotective protein clusterin is overexpressed in hypergastrinemic rodent models of oxyntic preneoplasia and promotes gastric cancer cell survival. PLOS ONE
  Academic article

2016

• Sagatun, Liv; Fossmark, Reidar; Jianu, Constantin-Sergiu; Qvigstad, Gunnar; Nordrum, Ivar Skjåk; Mjønes, Patricia. (2016) Follow-up of patients with ECL cell-derived tumours. Scandinavian Journal of Gastroenterology
  Academic article
• Waldum, Helge; Hauso, Øyvind; Brenna, Eiliv; Qvigstad, Gunnar; Fossmark, Reidar. (2016) Does long-term profound inhibition of gastric acid secretion increase the risk of ECL cell-derived tumors in man?. Scandinavian Journal of Gastroenterology
  Academic literature review

2015

• Olsen, Paul Anders S.; Fossmark, Reidar; Qvigstad, Gunnar. (2015) Fecal calprotectin in patients with suspected small bowel disease – a selection tool for small bowel capsule endoscopy?. Scandinavian Journal of Gastroenterology
  Academic article

2014

• Sørdal, Øystein Finset; Qvigstad, Gunnar; Nordrum, Ivar Skjåk; Sandvik, Arne Kristian; Gustafsson, Björn; Waldum, Helge. (2014) The PAS positive material in gastric cancer cells of signet ring type is not mucin. Experimental and molecular pathology (Print)
  Academic article
• Olsen, Paul A S; Fossmark, Reidar; Qvigstad, Gunnar. (2014) Fecal calprotectin in patients with suspected small bowel disease - A selection tool for small bowel capsule endoscopy?. Scandinavian Journal of Gastroenterology
  Academic article

2013

• Sørdal, Øystein Finset; Waldum, Helge; Nordrum, Ivar Skjåk; Boyce, Malcolm; Bergh, Kåre; Munkvold, Bjørn. (2013) The Gastrin Receptor Antagonist Netazepide (YF476) Prevents Oxyntic Mucosal Inflammation Induced by Helicobacter Pylori Infection in Mongolian Gerbils. Helicobacter
  Academic article
• Sørdal, Øystein; Qvigstad, Gunnar; Nordrum, Ivar Skjåk; Gustafsson, Björn; Waldum, Helge. (2013) In situ hybridization in human and rodent tissue by the use of a new and simplified method. Applied immunohistochemistry & molecular morphology (Print)
  Academic article

2012

• Erlandsen, Sten Even; Qvigstad, Gunnar; Fossmark, Reidar; Bakke, Ingunn; Chen, Duan; Sandvik, Arne Kristian. (2012) Regulated endocrine-specific protein 18 (RESP18) is localized to and regulated in A-like cells and G-cells in rat stomach. Regulatory Peptides
  Academic article
• Jianu, Constantin-Sergiu; Fossmark, Reidar; Viset, Trond; Qvigstad, Gunnar; Sørdal, Øystein Finset; Mårvik, Ronald. (2012) Gastric carcinoids after long-term use of a proton pump inhibitor. Alimentary Pharmacology and Therapeutics
  Academic article
• Jianu, Constantin-Sergiu; Lange, Ove Juel; Viset, Trond; Qvigstad, Gunnar; Martinsen, Tom Christian; Fougner, Reidun Lyngvi. (2012) Gastric neuroendocrine carcinoma after long-term use of proton pump inhibitor. Scandinavian Journal of Gastroenterology
  Academic article
• Fossmark, Reidar; Sørdal, O.J.; Jianu, Constantin-Sergiu; Qvigstad, Gunnar; Boyce, M; Waldum, Helge. (2012) YF476, a Gastrin Receptor Antagonist, Causes Regression of Tumors and Normalizes Serum Chromogranin A in Patients with Type 1 Gastric Carcinoids. Neuroendocrinology
  Abstract
• Waldum, Helge; Sandvik, Arne Kristian; Hauso, Øyvind; Qvigstad, Gunnar; Fossmark, Reidar. (2012) Withdrawing PPI Therapy: Response to Metz et al. American Journal of Gastroenterology
  Reader opinion piece
• Fossmark, Reidar; Sørdal, Øystein Finset; Jianu, Constantin-Sergiu; Qvigstad, Gunnar; Nordrum, Ivar Skjåk; Boyce, M. (2012) Treatment of gastric carcinoids type 1 with the gastrin receptor antagonist netazepide (YF476) results in regression of tumours and normalisation of serum chromogranin A. Alimentary Pharmacology and Therapeutics
  Academic article
• Sørdal, Øystein Finset; Waldum, Helge; Nordrum, Ivar Skjåk; Boyce, M; Bergh, Kåre; Qvigstad, Gunnar. (2012) The gastrin receptor antagonist YF476 prevents oxyntic mucosal inflammation due to Helicobacter pylori infection in Mongolian gerbils. Regulatory Peptides
  Abstract

2011

• Qvigstad, Gunnar; Viset, Trond; Fougner, Reidun Lyngvi. (2011) Eosinofil gastroenteritt. Tidsskrift for Den norske legeforening
  Academic literature review
• Fossmark, Reidar; Qvigstad, Gunnar; Martinsen, Tom Christian; Hauso, Øyvind; Waldum, Helge. (2011) Animal models to study the role of long-term hypergastrinemia in gastric carcinogenesis. Journal of Biomedicine and Biotechnology
  Academic literature review

2010

• Waldum, Helge; Qvigstad, Gunnar; Fossmark, Reidar; Kleveland, Per Martin; Sandvik, Arne Kristian. (2010) Rebound acid hypersecretion from a physiological, pathophysiological and clinical viewpoint. Scandinavian Journal of Gastroenterology
  Academic literature review
• Waldum, Helge; Martinsen, Tom Christian; Hauso, Øyvind; Qvigstad, Gunnar. (2010) Oral proton-pump inhibitors and step-down therapy for nonulcer dyspepsia: is this the right approach?. Therapeutic Advances in Gastroenterology
  Academic article

2009

• Waldum, Helge; Kleveland, Per Martin; Brenna, Eiliv; Bakke, Ingunn; Qvigstad, Gunnar; Martinsen, Tom Christian. (2009) Interactions between gastric acid secretagogues and the localization of the gastrin receptor. Scandinavian Journal of Gastroenterology
  Academic literature review

2008

• Fossmark, Reidar; Jianu, Constantin; Martinsen, Tom Christian; Qvigstad, Gunnar; Syversen, Unni. (2008) Fundic gland polyps induced by proton pump inhibition are not relates to hypergastrinemia and serum chromogranin. Scandinavian Journal of Gastroenterology
  Academic article
• Fossmark, Reidar; Jianu, CS; Martinsen, Tom Christian; Qvigstad, Gunnar; Syversen, Unni; Waldum, Helge. (2008) Serum gastrin and chromogranin A levels in patients with fundic gland polyps caused by long-term proton-pump inhibition. Scandinavian Journal of Gastroenterology
  Academic article
• Fossmark, Reidar; Qvigstad, Gunnar; Waldum, Helge. (2008) Gastric cancer: Animal studies on the risk of hypoacidity and hypergastrinemia. World Journal of Gastroenterology (WJG)
  Academic literature review
• Waldum, Helge; Qvigstad, G; Martinsen, TC; Fossmark, R. (2008) Controversies in the management of gastro-oesophageal diseases. Are all the gastric polyps 'bad'?. Scandinavian Journal of Gastroenterology
  Abstract
• Waldum, Helge; Sandvik, Arne Kristian; Brenna, Eiliv; Fossmark, Reidar; Qvigstad, Gunnar; soga, j. (2008) Classification of tumours. Journal of Experimental and Clinical Cancer Research
  Academic literature review
• Waldum, Helge; Kleveland, Per Martin; Brenna, Eiliv; Bakke, Ingunn; Qvigstad, Gunnar; Martinsen, Tom Christian. (2008) Interactions between gastric acid secretagogues and the localization of the gastrin receptor. Scandinavian Journal of Gastroenterology
  Academic literature review
• Qvigstad, Gunnar; Kolbjørnsen, Øyvor; Skancke, Ellen Margrete; Waldum, Helge. (2008) Gastric Neuroendocrine Carcinoma Associated with Atrophic Gastritis in the Norwegian Lundehund. Journal of Comparative Pathology
  Academic article

2007

• Waldum, Helge; Qvigstad, Gunnar. (2007) Gastric neuroendocrine carcinomas associated with atrophic gastritis in the Norwegian lundehund (puffin dog). Carcinogenesis
  Academic article
• Fossmark, Reidar; Jianu, Constantin; Martinsen, Tom Christian; Qvigstad, Gunnar; Syversen, Unni; Waldum, Helge. (2007) Serum gastrin and chromogranin A levels in patients with fundic gland polyps caused by long-term proton pump inhibition. Scandinavian Journal of Gastroenterology
  Academic article
• Fossmark, Reidar; Jianu, Constantin; Martinsen, Tom Christian; Qvigstad, Gunnar; Syversen, Unni; Waldum, Helge. (2007) Fundic gland polyps induced by proton pump inhibition are not realted to the level of hypergastrinemia and serum chromogranin A is affected by meals. Gastroenterology
  Abstract
• Waldum, Helge; Qvigstad, Gunnar. (2007) Proton pump inhibitors and gastric neoplasia. Gut
  Letter to the editor

2006

• Linder, S; Myrvold, K; Falkmer, Ursula; Qvigstad, Gunnar; Waldum, Helge; Falkmer, Sture Emil. (2006) Neuroendocrine cells in pancreatic duct adenocarcinoma: an immunohistochemical study. Journal of Experimental and Clinical Cancer Research
  Academic article
• Jianu, Constantin; Qvigstad, Gunnar; Waldum, Helge. (2006) Synergistic adenocarcinoma and carcinoid. Journal of Gastrointestinal and Liver Diseases
  Letter to the editor
• Qvigstad, Gunnar; Hatlen-Rebhan, Peter; Brenna, Eiliv; Waldum, Helge. (2006) Capsule endoscopy in clinical routine in patients with suspected disease of the small intestine: a 2-year prospective study. Scandinavian Journal of Gastroenterology
  Academic article

2005

• Waldum, Helge; Fossmark, Reidar; Qvigstad, Gunnar; Bakkelund, Karin Elvenes; Kawase, S. (2005) The Japanese cotton rat develops spontaneously an ECL cell derived gastric carcinoma.
  Academic chapter/article/Conference paper
• Waldum, Helge; Gustafsson, Bjørn; Fossmark, Reidar; Qvigstad, Gunnar. (2005) Antiulcer drugs and gastric cancer. Digestive Diseases and Sciences
  Academic literature review
• Fossmark, Reidar; Martinsen, Tom Christian; Qvigstad, Gunnar; Bendheim, Marianne Østensen; Kopstad, G.; Kashima, K. (2005) Ultrastructure and chromogranin A immunogold labelling of ECL cell carcinoids. APMIS - Journal of Pathologiy, Microbiology and Immunology
  Academic article

2004

• Waldum, Helge; Fossmark, R; Bakke, Ingunn; Martinsen, Tom Christian; Qvigstad, G. (2004) Hypergastrinemia in animals and man: Causes and consequences. Scandinavian Journal of Gastroenterology
  Academic literature review
• Fykse, Vidar; Sandvik, Arne Kristian; Qvigstad, Gunnar; Falkmer, Sture Emil; Syversen, Unni; Waldum, Helge. (2004) Treatment of ECL cell carcinoids with octreotide LAR. Scandinavian Journal of Gastroenterology
  Academic article
• Qvigstad, Gunnar; Fløttum, O; Waldum, Helge. (2004) Kapselendoskopi-en ny metode for diagnostikk av sykdom i tynntarm. Tidsskrift for Den norske legeforening
  Academic article
• Qvigstad, Gunnar; Waldum, Helge. (2004) Rebound hypersecretion after inhibition of gastric acid secretion. Basic & Clinical Pharmacology
  Academic article
• Syversen, Unni; Ramstad, H; Gamme, K; Qvigstad, G; Falkmer, Sture Emil; Waldum, Helge. (2004) Clinical significance of elevated serum chromogranin A levels. Scandinavian Journal of Gastroenterology
  Academic article

2003

• Beisvåg, Vidar; Falck, G.; Loenneche, Jan P.; Qvigstad, G; Jynge, Per; Skomedal, T.. (2003) Identification and regulation of the gastric H+/K+ATPase in the rat heart. Acta Physiologica Scandinavica
  Academic article
• Waldum, Helge; Qvigstad, G; Sandvik, Arne Kristian. (2003) Reg protein in gastric cancer tumour cells. FEBS Letters
  Feature article
• Martinsen, Tom Christian; Kawase, Shiro; Håkanson, R; Torp, Sverre Helge; Fossmark, Reidar; Qvigstad, G. (2003) SpontaneousECL cell carcinomas in cotton rats. Natural course and the effect of a gastrin receptor antagonist. Carcinogenesis
  Academic article
• Martinsen, Tom Christian; Kawase, Shiro; Håkanson, Rolf; Torp, Sverre Helge; Fossmark, Reidar; Qvigstad, G. (2003) Spontaneous ECL cell carcinomas in cotton rats: natural course and prevention by a gastrin receptor antagonist. Carcinogenesis
  Academic article
• Beisvåg, Vidar; Falck, G; Loennechen, Jan P.; Qvigstad, Gunnar; Jynge, Per; Skomedal, Tor. (2003) Identification and regulation of the gastric H+/K+-ATPase in the rat heart. Acta Physiologica Scandinavica
  Academic article

2002

• Qvigstad, G; Qvigstad, Tor; Westre, Bjørn; Sandvik, Arne Kristian; Brenna, Eiliv; Waldum, Helge. (2002) Neuroendocrine differentiation in gastric adenocarcinomas associated with severe hypergastrinemia and/or pernicious anemia. APMIS - Journal of Pathologiy, Microbiology and Immunology
  Academic article
• Bofin, Anna M.; Waldum, Camilla; Qvigstad, G; Waldum, Helge. (2002) Neuroendocrine differentiation in carcinoma of the breast. APMIS - Journal of Pathologiy, Microbiology and Immunology
  Academic article

2001

• Waldum, Helge; Qvigstad, G; Falkmer, Sture Emil. (2001) Letter to the Editor. Virchows Archiv
  Academic article
• Waldum, Helge; Qvigstad, G; Falkmer, Sture Emil. (2001) Indications for a neuroendocrine tumor-carcinoma sequence. Virchows Archiv
  Academic article
• Reseland, Janne E.; Syversen, Unni; Bakke, Ingunn; Qvigstad, G; Eide, Liv G; Hjertner, ¯yvind. (2001) Leptin is expressed in and secreted from primary cultures of human osteoblasts and promotes bone mineralization. Journal of Bone and Mineral Research
  Academic article
• Waldum, Helge; Bakke, Ingunn; Torp, Sverre Helge; Qvigstad, G; Brenna, Eiliv; Sandvik, Arne Kristian. (2001) Effects of the peroxisome proliferator ciprofibrate and the somatostatin analogue octreotide alone or in combination on the rat liver. Recent Advances and Research Updates
  Academic article
• Torp, SH; Qvigstad, G; Brenna, E; Sandvik, Arne Kristian. (2001) Effects of the peroxisomeproliferator ciprofibrate and the somatostatin analogue octreotide alone or in combination on the rat liver. Recent Advances and Research Updates
  Academic article
• Waldum, Helge; Qvigstad, G; Falkmer, Sture Emil. (2001) Letter to the editor. Virchows Archiv
  Feature article
• Fresvig, Anne; Qvigstad, Gunnar; Halvorsen, Tore Bøhmer; Falkmer, Sture Emil; Waldum, Helge. (2001) Neuroendocrine differentiation in bronchial carcinomas of classical squamous cell-type. An immunohistochemical study of 29 cases, applying the tyramid signal amplification technique. Applied immunohistochemistry & molecular morphology (Print)
  Academic article
• Bakke, Ingunn; Qvigstad, G; Sandvik, Arne Kristian; Waldum, Helge. (2001) The CCK-2 receptor is located on the ECL cell, but not on the parietal cell. Scandinavian Journal of Gastroenterology
  Academic article
• Bakke, Ingunn; Qvigstad, G; Waldum, Helge. (2001) Biologically active CCK-2 receptors are located on the ECL cell, but not on the parietal cell. Scandinavian Journal of Gastroenterology
  Academic article

2000

• Hjertner, ¯yvind; Qvigstad, Gunnar; Hjorth-Hansen, Henrik; Seidel, Carina; Woodliff, Jeffery; Epstein, Joshua. (2000) Expression of urokinase plasminogen activator and the urokinase plasminogen activator receptor in myeloma cells. British Journal of Haematology
  Academic article
• Qvigstad, G; Falkmer, Sture Emil; Waldum, Helge. (2000) Immunhistokjemisk diagnostikk ved bruk av tyramid signalamplifikasjon. Tidsskrift for Den norske legeforening
  Academic article
• Bakke, Ingunn; Qvigstad, G; Brenna, Eiliv; Sandvik, AK; Waldum, Helge. (2000) Gastrin has a specific proliferative effect on the rat enterochromaffin-like cell, but not on the parietal cell: a study by elutriation centrifugation. Acta Physiologica Scandinavica
  Academic article
• Guanglin, Cui; Qvigstad, G; Falkmer, Sture Emil; Sandvik, AK; Kawase, Shiro; Waldum, Helge. (2000) Spontaneous ECLomas in cotton rats (Sigmodon hispidus): tumours occurring in hypoacidic/hypergastrinaemic animals with normal parietal cells. Carcinogenesis
  Academic article
• Qvigstad, G; Sandvik, AK; Brenna, Eiliv; Falkmer, Sture Emil; Waldum, Helge. (2000) Detection of chromogranin A in human gastric adenocarcinomas using a sensitive immunohistochemical technique. The Histochemical Journal
  Academic article
• Cui, G; Qvigstad, Gunnar; Falkmer, Sture Emil; Sandvik, Arne Kristian; Kawase, S; Waldum, Helge. (2000) Spontaneous ECLomas in cotton rats (Sigmodon hispidus): Tumours occurring in hypoacidic/hypergastrinaemic animal's with normal parietal cells. Carcinogenesis
  Academic article
• Qvigstad, G; Qvigstad, Tor; Westre, Bjørn; Sandvik, AK; Brenna, Eiliv; Waldum, Helge. (2000) Neuroendocrine differentiation in gastric adenocarcinomas associated with severe hypergastrinemia. Cancer Detection and Prevention
  Academic article
• Qvigstad, Gunnar; Falkmer, Sture Emil; Waldum, Helge. (2000) Immunhistokjemisk diagnostikk ved bruk av tyramid-signalamplifikasjon. Tidsskrift for Den norske legeforening
  Academic article

1999

• Syversen, Unni; Drevon, CA; Bakke, I; Qvigstad, G; Hjertner, Ø; Gordeladze, JO. (1999) Demonstration of leptin mRNA and leptin in human osteoblasts. Journal of Bone and Mineral Research
  Academic article
• Qvigstad, G; Falkmer, Sture Emil; Westre, Bjørn; Waldum, Helge. (1999) Clinical and histopathological tumour progression in ECL cell carcinoids ("ECLomas"). APMIS - Journal of Pathologiy, Microbiology and Immunology
  Academic article
• Waldum, Helge; Qvigstad, G; Sandvik, AK. (1999) Letter to the editor. Authors' reply. Journal of Pathology
  Feature article
• Qvigstad, Gunnar; Falkmer, Sture Emil; Westre, B; Waldum, Helge. (1999) Clinical and histopathological tumour progression in ECL cell carcinoids (ECLomas). APMIS - Journal of Pathologiy, Microbiology and Immunology
  Academic article
• Qvigstad, G; Bjørgaas, Marit; Eide, Inger; Sandvik, AK; Waldum, Helge. (1999) Vagal stimulation augments maximal (penta) gastrin-stimulated acid secretion in humans. Acta Physiologica Scandinavica
  Academic article
• Qvigstad, G; Bjørgaas, Marit; Eide, Inger; Sandvik, AK; Waldum, Helge. (1999) Vagal stimulation augments maximal (penta)gastrin stimulated acid secretion in man. Acta Physiologica Scandinavica
  Academic article

1998

• Qvigstad, G; Arnestad, Jon S.; Brenna, Eiliv; Waldum, Helge. (1998) Treatment with proton pump inhibitors induces tolerance to histamine- 2 receptor antagonists in Helicobacter pylori-negative patients. Scandinavian Journal of Gastroenterology
  Academic article