2025

• Dubois, Leonard; Seksik, Philippe; Nancey, Stephane; Nachury, Maria; Treton, Xavier; Buisson, Anthony. (2025) UNCOVERING THE DYNAMICS OF MUCOSA-ASSOCIATED MICROBIOTAIN POST-OPERATIVE RECURRENCE OF CROHN’S DISEASE. United European Gastroenterology Journal (UEG Journal)
  Abstract

2024

• Fossmark, Reidar; Olaisen, Maya. (2024) Changes in the Gastrointestinal Microbiota Induced by Proton Pump Inhibitors—A Review of Findings from Experimental Trials. Microorganisms
  Academic literature review
• Waldum, Helge; Fossmark, Reidar. (2024) Eradication of Helicobacter pylori by a potassium-competitive acid blocker alone?.
  Feature article
• Straum, Synne; Bringaker, Karoline Wollan; Rekstad, Lars Cato; Fossmark, Reidar. (2024) Esophageal cancers missed at upper endoscopy in Central Norway 2004 to 2021 – A population-based study. BMC Gastroenterology
  Academic article
• Kvamme, Camilla Jørdre; Stillingen, Thomas Lindmo; Sandø-Klemmetvoll, Alina Desiree; Mjønes, Patricia Gjertrud; Bringeland, Erling Audun; Fossmark, Reidar. (2024) Early Gastric Cancers in Central Norway 2001 to 2016—A Population-Based Study. Cancers
  Academic article
• Bringeland, Erling Audun; Våge, Christina; Ubøe, Ann Amelia Savage; Sandø, Alina Desiree; Mjønes, Patricia Gjertrud; Fossmark, Reidar. (2024) Epstein–Barr Virus and Clinico-Endoscopic Characteristics of Gastric Remnant Cancers Compared to Proximal Non-Remnant Cancers: A Population-Based Study. Cancers
  Academic article
• Berg, Sigrid; Amini, Naseh; Solberg, Stian; Ødegård, Rønnaug Astri; Kulseng, Bård Eirik; Fossmark, Reidar. (2024) Ex Vivo Demonstration of a Novel Dual-Frequency Ultrasound Method for Quantitative Measurements of Liver Fat Content. Ultrasound in Medicine and Biology
  Academic article

2023

• Fossmark, Reidar. (2023) Helseplattformen må lukkes. Adresseavisen
  Reader opinion piece
• Fossmark, Reidar; Lirhus, Sandre Svatun; Høivik, Marte Lie. (2023) The impact of proton pump inhibitors on the course of ulcerative colitis: a cohort study of over 10,000 newly diagnosed patients in Norway. Scandinavian Journal of Gastroenterology
  Academic article
• Waldum, Helge; Fossmark, Reidar. (2023) Inflammation and Digestive Cancer. International Journal of Molecular Sciences
  Academic literature review
• Fossmark, Reidar; Ness-Jensen, Eivind; Sørdal, Øystein Finset. (2023) Is empiric proton pump inhibition in patients with symptoms of extraesophageal gastroesophageal reflux justified?. BMC Gastroenterology
  Academic literature review
• Fossmark, Reidar; Fasting, Magnus Hølmo. (2023) Dysplasi og tidlig kreft i øsofagus. NGF-nytt
  Article in business/trade/industry journal
• Fossmark, Reidar; Dalsbø, Peter Lefstad; Rokseth, Kjell Morten; Hauso, Øyvind. (2023) Laser lithotripsy for the treatment of a giant fecalith obstructing a colorectal anastomosis. Endoscopy
  Academic article
• Folkestad, Oddry H; Hauso, Øyvind; Mjønes, Patricia Gjertrud; Fougner, Reidun; Wasmuth, Hans; Fossmark, Reidar. (2023) Survival Trends in Patients with Small Intestinal Neuroendocrine Tumours—A Cohort Study in Central Norway. Cancers
  Academic article
• Ubøe, Ann Amelia Savage; Våge, Christina; Mjønes, Patricia Gjertrud; Bringeland, Erling Audun; Fossmark, Reidar. (2023) Gastric remnant cancer and long-term survival in Central Norway 2001 to 2016 – A population-based study. Surgial oncology
  Academic article
• Fossmark, Reidar; Hauge, Tobias. (2023) Surveillance ved Barretts øsofagus. NGF-nytt
  Academic literature review

2022

• Olaisen, Maya; Fossmark, Reidar. (2022) Reply to "Too Soon to Dismiss Inflammation-Related Differences in the Mucosa-Associated Microbiota in Crohn's Disease Patients". Inflammatory Bowel Diseases
  Reader opinion piece
• Waldum, Helge; Fossmark, Reidar. (2022) Proton pump inhibitors and mortality. Gastroenterology
  Reader opinion piece
• Olaisen, Maya; Richard, Mathias L.; Beisvag, Vidar; Granlund, Atle van Beelen; Røyset, Elin Synnøve; Rué, Olivier. (2022) The ileal fungal microbiota is altered in Crohn's disease and is associated with the disease course. Frontiers in Medicine
  Academic article
• 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
• Ness-Jensen, Eivind; Bringeland, Erling Audun; Mjønes, Patricia; Lagergren, Jesper; Grønbech, Jon Erik; Waldum, Helge. (2022) Hypergastrinemia and mortality in gastric adenocarcinoma: a population-based cohort study, the HUNT study. Scandinavian Journal of Gastroenterology
  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
  Academic article
• Ausen, Kjersti; Fossmark, Reidar; Spigset, Olav; Pleym, Hilde. (2022) Safety and Efficacy of Local Tranexamic Acid for the Prevention of Surgical Bleeding in Soft-Tissue Surgery: A Review of the Literature and Recommendations for Plastic Surgery. Plastic and Reconstructive Surgery
  Academic article
• Sandvik, Elfrid Christine Smith; Aasarød, Kristin Matre; Johnsen, Gjermund; Hoff, Dag Arne Lihaug; Kulseng, Bård Eirik; Hyldmo, Åsne Ask. (2022) The Effect of Roux-en-Y Gastric Bypass on Non-Alcoholic Fatty Liver Disease Fibrosis Assessed by FIB-4 and NFS Scores—An 11.6-Year Follow-Up Study. Journal of Clinical Medicine
  Academic article

2021

• Aasarød, Kristin Matre; Mosti, Mats Peder; Teie, Malin Isabell; Stunes, Astrid Kamilla; Fossmark, Reidar; Syversen, Unni. (2021) Do patients with gastroesophageal reflux disease exhibit compromised bone quality prior to proton pump inhibitor therapy?. Bone Reports
  Academic article
• Ness-Jensen, Eivind; Bringeland, Erling Audun; Mjønes, Patricia; Lagergren, Jesper; Grønbech, Jon Erik; Waldum, Helge. (2021) HYPERGASTRINEMIA IS NOT ASSOCIATED WITH INCREASED MORTALITY IN GASTRIC ADENOCARCINOMA. United European Gastroenterology Journal (UEG Journal)
  Abstract
• Folkestad, Oddry; Wasmuth, Hans; Mjønes, Patricia; Fougner, Reidun; Hauso, Øyvind; Fossmark, Reidar. (2021) Survival and disease recurrence in patients with duodenal neuroendocrine tumours—a single centre cohort. Cancers
  Academic article
• Waldum, Helge; Fossmark, Reidar. (2021) Gastritis, Gastric Polyps and Gastric Cancer. International Journal of Molecular Sciences
  Academic literature review
• 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
• Fossmark, Reidar; Olaisen, Maya; Martinsen, Tom Christian; Melberg, Hans Olav. (2021) Factors associated with the persistence of oral 5-aminosalicylic acid monotherapy in ulcerative colitis: a nationwide Norwegian cohort study. Therapeutic Advances in Gastroenterology
  Academic article

2020

• Olaisen, Maya; Flatberg, Arnar; Granlund, Atle van Beelen; Røyset, Elin Synnøve; Martinsen, Tom Christian; Sandvik, Arne Kristian. (2020) Bacterial Mucosa-associated Microbiome in Inflamed and Proximal Noninflamed Ileum of Patients With Crohn's Disease. Inflammatory Bowel Diseases
  Academic article
• Folkestad, Oddry H; Wasmuth, Hans; Mjønes, Patricia; Fougner, Reidun; Hauso, Øyvind; Fossmark, Reidar. (2020) Survival and disease recurrence in patients operated for small intestinal neuroendocrine tumors at a referral hospital. Surgial oncology
  Academic article
• Ness-Jensen, Eivind; Bringeland, Erling Audun; Mattsson, Fredrik; Mjønes, Patricia; Lagergren, Jesper; Grønbech, Jon Erik. (2020) Hypergastrinemia is associated with an increased risk of gastric adenocarcinoma with proximal location: A prospective population-based nested case-control study. International Journal of Cancer
  Academic article
• Ness-Jensen, Eivind; Bringeland, Erling Audun; Mattsson, Fredrik; Lagergren, Jesper; Grønbech, Jon Erik; Waldum, Helge. (2020) Hypergastrinemia is associated with proximal and intestinal type gastric adenocarcinoma. Gastroenterology
  Abstract
• Aasarød, Kristin Matre; Waldum, Helge; Stunes, Astrid Kamilla; Sandvik, Arne Kristian; Flatberg, Arnar; Mjønes, Patricia. (2020) Gastric Corpus Mucosal Hyperplasia and Neuroendocrine Cell Hyperplasia, but not Spasmolytic Polypeptide-Expressing Metaplasia, Is Prevented by a Gastrin Receptor Antagonist in H+/K+ATPase Beta Subunit Knockout Mice. International Journal of Molecular Sciences
  Academic article
• Olaisen, Maya; Flatberg, Arnar; Granlund, Atle van Beelen; Røyset, Elin Synnøve; Martinsen, Tom Christian; Sandvik, Arne Kristian. (2020) P833 Bacterial mucosa-associated microbiome in inflamed and proximal non-inflamed ileum of patients with Crohn’s disease. Journal of Crohn's and Colitis
  Abstract
• Fossmark, Reidar; Olaisen, Maya; Martinsen, Tom Christian; Melberg, Hans Olav. (2020) P760 Differences in persistence of oral mesalazine preparations as monotherapy in patients with ulcerative colitis. Journal of Crohn's and Colitis
  Abstract

2019

• Olaisen, Maya; Spigset, Olav; Flatberg, Arnar; Granlund, Atle van Beelen; Brede, wenche Rødseth; Albrektsen, Grethe. (2019) Mucosal 5-aminosalicylic acid concentration, drug formulation and mucosal microbiome in patients with quiescent ulcerative colitis. Alimentary Pharmacology and Therapeutics
  Academic article
• Martinsen, Tom Christian; Fossmark, Reidar; Waldum, Helge. (2019) The phylogeny and biological function of gastric juice-microbiological consequences of removing gastric acid. International Journal of Molecular Sciences
  Academic literature review
• Olaisen, Maya; Fossmark, Reidar. (2019) Editorial: mesalamine and mucosal microbiome in quiescent ulcerative colitis – what can we learn? Authors reply. Alimentary Pharmacology and Therapeutics
  Academic article
• Waldum, Helge; Fossmark, Reidar. (2019) Role of Autoimmune Gastritis in Gastric Cancer. Clinical and Translational Gastroenterology
  Academic article
• Fossmark, Reidar; Balto, Tine Marie; Martinsen, Tom Christian; Grønbech, Jon Erik; Munkvold, Bjørn; Mjønes, Patricia. (2019) Hepatic micrometastases outside macrometastases are present in all patients with ileal neuroendocrine primary tumour at the time of liver resection. Scandinavian Journal of Gastroenterology
  Academic article
• Waldum, Helge; Fossmark, Reidar. (2019) Enterochromaffin-like (ECL) Cells.
  Chapter
• Fossmark, Reidar; Martinsen, Tom Christian; Waldum, Helge. (2019) Adverse effects of proton pump inhibitors – evidence and plausibility. International Journal of Molecular Sciences
  Academic literature review

2018

• Waldum, Helge; Sørdal, Øystein Finset; Fossmark, Reidar. (2018) Proton pump inhibitors (PPIs) may cause gastric cancer – clinical consequences. Scandinavian Journal of Gastroenterology
  Academic literature review
• Waldum, Helge; Fossmark, Reidar. (2018) Types of gastric carcinomas. International Journal of Molecular Sciences
  Academic literature review
• Waldum, Helge; Öberg, Kjell; Sørdal, Øystein Finset; Sandvik, Arne Kristian; Gustafsson, Björn; Mjønes, Patricia. (2018) Not only stem cells, but also mature cells, particularly neuroendocrine cells, may develop into tumours: time for a paradigm shift. Therapeutic Advances in Gastroenterology
  Academic literature review
• Waldum, Helge; Fossmark, Reidar. (2018) Proton pump inhibitors and gastric cancer: a long expected side effect finally reported also in man. Gut
  Academic article

2017

• 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
• Mjønes, Patricia; Nordrum, Ivar Skjåk; Sørdal, Øystein Finset; Sagatun, Liv; Fossmark, Reidar; Sandvik, Arne Kristian. (2017) Expression of the cholecystokinin-B receptor in neoplastic gastric cells. Hormones and Cancer
  Academic article
• Fossmark, Reidar; Waldum, Helge. (2017) Sykdommer i ventrikkel og duodenum.
  Chapter

2016

• 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
• Boyce, Malcolm; Moore, Andrew; Sagatun, Liv; Parsons, Bryony; Varro, Andrea; Campbell, Fiona. (2016) Netazepide, a gastrin/cholecystokinin-2 receptor antagonist, can eradicate gastric neuroendocrine tumours in patients with autoimmune chronic atrophic gastritis. British Journal of Clinical Pharmacology
  Academic article
• Sagatun, Liv; Mjønes, Patricia Gjertrud; Jianu, Constantin-Sergiu; Boyce, Malcolm; Waldum, Helge Lyder; Fossmark, Reidar. (2016) The gastrin receptor antagonist netazepide (YF476) in patients with type 1 gastric enterochromaffin-like cell neuroendocrine tumours: Review of long-term treatment. European Journal of Gastroenterology and Hepathology
  Academic article
• 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
• Ness-Jensen, Eivind; Fossmark, Reidar. (2016) Adverse Effects of Proton Pump Inhibitors in Chronic Kidney Disease. JAMA Internal Medicine
  Reader opinion piece
• Ness-Jensen, Eivind; Fossmark, Reidar. (2016) To the editor. JAMA Internal Medicine
  Reader opinion piece
• Aasarød, Kristin Matre; Ramezanzadehkoldeh, Masoud; Shabestari, Maziar; Mosti, Mats Peder; Stunes, Astrid Kamilla; Reseland, Janne Elin. (2016) Skeletal effects of a gastrin receptor antagonist in H+/K+ATPase beta subunit KO mice. Journal of Endocrinology
  Academic article
• Fossmark, Reidar; Rao, Shalini; Mjønes, Patricia; Munkvold, Bjørn; Flatberg, Arnar; Varro, Andrea. (2016) PAI-1 deficiency increases the trophic effects of hypergastrinemia in the gastric corpus mucosa. Peptides
  Academic article
• Fossmark, Reidar; Calvete, Oriol; Mjønes, Patricia; Benitez, Javier; Waldum, Helge. (2016) ECL-cell carcinoids and carcinoma in patients homozygous for an inactivating mutation in the gastric H<sup>+</sup>K<sup>+</sup>ATPase alpha subunit. APMIS - Journal of Pathologiy, Microbiology and Immunology
  Academic article
• Aasarød, Kristin Matre; Mosti, Mats Peder; Stunes, Astrid Kamilla; Reseland, Janne Elin; Basso, Trude; Syversen, Unni. (2016) Impaired skeletal health in patients with chronic atrophic gastritis. Scandinavian Journal of Gastroenterology
  Academic article
• Aasarød, Kristin Matre; Stunes, Astrid Kamilla; Mosti, Mats Peder; Ramezanzadehkoldeh, Masoud; Viggaklev, Bjørn Ivar; Reseland, Janne Elin. (2016) Effects of the histamine 1 receptor antagonist cetirizine on the osteoporotic phenotype in H+ /K+ ATPase beta subunit KO mice. Journal of Cellular Biochemistry
  Academic article

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
• Ausen, Kjersti; Fossmark, Reidar; Spigset, Olav; Pleym, Hilde. (2015) Randomized clinical trial of topical tranexamic acid after reduction mammoplasty. British Journal of Surgery
  Academic article
• Fossmark, Reidar; Sagatun, Liv; Nordrum, Ivar Skjåk; Sandvik, Arne Kristian; Waldum, Helge. (2015) Hypergastrinemia is associated with adenocarcinomas in the gastric corpus and shorter patient survival. APMIS - Journal of Pathologiy, Microbiology and Immunology
  Academic article
• Waldum, Helge; Hauso, Øyvind; Fossmark, Reidar. (2015) Letter: Proton pump inhibitors, hypergastrinaemia and the risk of gastric neoplasia. Alimentary Pharmacology and Therapeutics
  Reader opinion piece
• Waldum, Helge; Kleveland, Per Martin; Fossmark, Reidar. (2015) Upper gastrointestinal physiology and diseases. Scandinavian Journal of Gastroenterology
  Academic article

2014

• Fossmark, Reidar; Sagatun, Liv; Sandvik, Arne Kristian; Waldum, Helge. (2014) Serum gastrin in relation to localization and histological sub-classification of non-cardia adenocarcinomas in the stomach. Gastroenterology
  Abstract
• Sagatun, Liv; Jianu, Constantin-Sergiu; Fossmark, Reidar; Mårvik, Ronald; Nordrum, Ivar Skjåk; Waldum, Helge. (2014) The gastric mucosa 25 years after proxiaml gastric vagotomy. Scandinavian Journal of Gastroenterology
  Academic article
• Waldum, Helge; Hauso, Øyvind; Sørdal, Øystein Finset; Fossmark, Reidar. (2014) Gastrin May Mediate the Carcinogenic Effect of Helicobacter pylori Infection of the Stomach. Digestive Diseases and Sciences
  Academic article
• Walenkamp, A; Crespo, G; Maya, F Fierro; Fossmark, Reidar; Igaz, P; Rinke, A. (2014) Hallmarks of gastrointestinal neuroendocrine tumours: Implications for treatment. Endocrine-Related Cancer
  Academic literature review
• 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
• Waldum, Helge; Hauso, Øyvind; Fossmark, Reidar. (2014) The regulation of gastric acid secretion - clinical perspectives. Acta Physiologica
  Academic literature review
• Olaisen, Maya; Rydning, Astrid; Martinsen, Tom Christian; Nordrum, Ivar Skjåk; Mjønes, Patricia Gjertrud; Fossmark, Reidar. (2014) Cytomegalovirus infection and postoperative complications in patients with ulcerative colitis undergoing colectomy. Scandinavian Journal of Gastroenterology
  Academic article

2013

• Fossmark, Reidar; Sørdal, Øystein Finset; Bakkelund, Karin Elvenes; Nordrum, Ivar Skjåk; Waldum, Helge. (2013) The effects of unilateral truncal vagotomy on gastric carcinogenesis in hypergastrinemic Japanese female cotton rats. Regulatory Peptides
  Academic article
• Zeinali, Fatemeh; Fossmark, Reidar; Hauso, Øyvind; Wiseth, Rune; Hjertner, Øyvind; Waldum, Helge. (2013) Serotonin in blood: Assessment of its origin by concomitant determination of beta-thromboglobulin (platelets) and chromogranin A (enterochromaffin cells). Scandinavian Journal of Clinical and Laboratory Investigation
  Academic article
• Fossmark, Reidar; Skarsvåg, Espen Christoffer; Aarset, Harald; Hjort-Hansen, Henrik; Waldum, Helge. (2013) Symptomatic primary (Al) amyloidosis of the stomach and duodenum. Case Reports in Gastrointestinal Medicine
  Academic article
• Zwiggelaar, Rosalie Theda Margien; Fossmark, Reidar; Kidd, Mark; Furnes, Marianne Waldum; Sandvik, Arne Kristian; Waldum, Helge. (2013) Tu1089 Somatostatin and the Slow-Growing Nature of Small Intestinal Neuroendocrine Tumors. Gastroenterology
  Abstract
• Vigen, Alexander; Kodama, Yosuke; Viset, Trond; Fossmark, Reidar; Waldum, Helge; Kidd, Mark. (2013) Immunohistochemical evidence for an impairment of autophagy in tumorigenesis of gastric carcinoids and adenocarcinomas in rodent models and patients. Histology and Histopathology
  Academic article
• Fossmark, Reidar; Bretthauer, Michael; Gustafsson, Björn. (2013) Who should perform endoscopies? (Hvem bør utføre endoskopier?). Tidsskrift for Den norske legeforening (Tidsskriftet)
  Academic article
• Fossmark, Reidar; Suren, Pål; Waldum, Helge. (2013) Karakterer på medisinstudiet bør gjeninnføres. Dagens medisin
  Reader opinion piece
• Fossmark, Reidar; Waldum, Helge. (2013) Development of diffuse carcinomas in the gastric corpus in patients with rugal hyperplastic gastritis. International Journal of Cancer
  Reader opinion piece
• Skarsvåg, Espen Christoffer; Hjort-Hansen, Henrik; Fossmark, Reidar. (2013) Symptomatic primary (AL) amyloidosis in the stomach and duodenum. BestPractice Gastroenterologi
  Article in business/trade/industry journal
• Fossmark, Reidar; Waldum, Helge. (2013) The Distressing Overuse of Gastric Acid Inhibitors. Digestive Diseases and Sciences
  Editorial

2012

• Jianu, Constantin-Sergiu; Fossmark, Reidar; Waldum, Helge. (2012) Long-term use of proton pump inhibitors – consequences for the gastric mucosa. Best Practice Onkologi/Hematologi
  Article in business/trade/industry journal
• Bakkelund, Karin Elvenes; Nordrum, Ivar Skjåk; Fossmark, Reidar; Waldum, Helge. (2012) Gastric Carcinomas Localized to the Cardia. Gastroenterology Research and Practice
  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, 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
• 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
• Riis, Åse Garløv; Martinsen, Tom Christian; Waldum, Helge; Fossmark, Reidar. (2012) Clinical experience with infliximab and adalimumab in a single-center cohort of patients with Crohn's disease. Scandinavian Journal of Gastroenterology
  Academic article
• 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
• Vigen, Alexander; Kodama, Yosuke; Viset, Trond; Fossmark, Reidar; Waldum, Helge; Kidd, Mark. (2012) Impaired Autophagy in Gastric Carcinoids and Adenocarcinoma of Both Rodent Models and Patients. Gastroenterology
  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; Stunes, Astrid Kamilla; Petzold, Christiane; Waldum, Helge; Rubert, Marina; Lian, Aina-Mari. (2012) Decreased bone mineral density and reduced bone quality in H+/K+ ATPase beta-subunit deficient mice. Journal of Cellular Biochemistry
  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

2011

• Stunes, Astrid Kamilla; Westbroek, Irene; Fossmark, Reidar; Berge, Rolf Kristian; Reseland, Janne Elin; Syversen, Unni. (2011) Skeletal effects of the saturated 3-thia fatty acid tetradecylthioacetic acid in rats. PPAR Research
  Academic article
• Stunes, Astrid Kamilla; Westbroek, Irene; Gustafsson, Björn; Fossmark, Reidar; Waarsing, Jan H; Eriksen, Erik Fink. (2011) The peroxisome proliferator-activated receptor (PPAR) alpha agonist fenofibrate maintains bone mass, while the PPAR gamma agonist pioglitazone exaggerates bone loss, in ovariectomized rats. BMC Endocrine Disorders
  Academic article
• Jianu, Constantin-Sergiu; Fossmark, Reidar; Syversen, Unni; Hauso, Øyvind; Fykse, Vidar; Waldum, Helge. (2011) Five-year follow-up of patients treated for 1 year with octreotide long-acting release for enterochromaffin-like cell carcinoids. Scandinavian Journal of Gastroenterology
  Academic article
• 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
• Gustafsson, Björn; Bakke, Ingunn; Hauso, Øyvind; Kidd, Mark; Modlin, Irvin M; Fossmark, Reidar. (2011) Parietal cell activation by arborization of ECL cell cytoplasmic projections is likely the mechanism for histamine induced secretion of hydrochloric acid. Scandinavian Journal of Gastroenterology
  Academic article

2010

• Bakkelund, Karin Elvenes; Waldum, Helge; Nordrum, Ivar Skjåk; Hauso, Øyvind; Fossmark, Reidar. (2010) Long-term gastric changes in achlorhydric H+/K+-ATPase beta subunit deficient mice. Scandinavian Journal of Gastroenterology
  Academic article
• Jianu, Constantin-Sergiu; Fossmark, Reidar; Syversen, Unni; Hauso, Øyvind; Waldum, Helge. (2010) A meal test improves the specificity of chromogranin A as a marker of neuroendocrine neoplasia. Tumour Biology
  Academic article
• 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
• Martinsen, Tom Christian; Skogaker, Nan E Tostrup; Fossmark, Reidar; Nordrum, Ivar Skjåk; Sandvik, Arne Kristian; Bendheim, Marianne Østensen. (2010) Neuroendocrine Cells in Diffuse Gastric Carcinomas: An Ultrastructural Study With Immunogold Labeling of Chromogranin A. Applied immunohistochemistry & molecular morphology (Print)
  Academic article

2009

• Jianu, Constantin-Sergiu; Fossmark, R; Syversen, U; Hauso, O; Waldum, H. (2009) A Meal-Test Improves the Specificity of Chromogranin A as a Marker of Neuroendocrine Neoplasia. Neuroendocrinology
  Abstract
• Bakkelund, Karin Elvenes; Fossmark, Reidar; Nordrum, Ivar Skjåk; Waldum, Helge. (2009) Effect of antrectomy in hypergastrinaemic female Japanese cotton rats. Scandinavian Journal of Gastroenterology
  Academic article
• 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
• Nørsett, Kristin; Lægreid, Astrid; Kusnierczyk, Waclaw; Langaas, Mette; Ylving, S; Fossmark, Reidar. (2008) Changes in gene expression of gastric mucosa during therapeutic acid inhibition. European Journal of Gastroenterology and Hepathology
  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
• 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
• 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
• 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
• Martinsen, T; Skogaker, Nan Elisabeth Tostrup; Fossmark, R; Nordrum, Ivar Skjåk; Sandvik, A; Walcum, H. (2008) The presence of malignant ecl cells in diffuse gastric carcinomas; An ultrastructural study with immunogold labelling of chromogranin A. Annals of Oncology
  Abstract
• 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

2007

• Bendheim, Marianne Østensen; Fossmark, Reidar; Waldum, Helge; Martinsen, Tom Christian. (2007) Morphology of g cells in hypergastrinemic cotton rats. Scandinavian Journal of Laboratory Animal Science
  Academic article
• Fossmark, Reidar; Waldum, Helge. (2007) Rebound acid hypersecretion. Alimentary Pharmacology and Therapeutics
  Reader opinion piece
• 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
• Fossmark, Reidar; Brenna, E; Waldum, HL. (2007) pH 4.0. Scandinavian Journal of Gastroenterology
  Editorial
• 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

2006

• Fossmark, Reidar; Brenna, Eiliv; Waldum, Helge. (2006) pH 4.0. Scandinavian Journal of Gastroenterology
  Reader opinion piece
• Bakkelund, Karin Elvenes; Fossmark, Reidar; Nordrum, Ivar Skjåk; Waldum, Helge. (2006) Signet ring cells in gastric carcinomas are derived from neuroendocrine cells. Journal of Histochemistry and Cytochemistry
  Academic article

2005

• 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
• Fossmark, Reidar; Johnsen, Geir; Waldum, Helge; Johannesen, Eli Marie. (2005) Rebound acid hypersecretion after long-term inhibition of gastric acid secretion. Alimentary Pharmacology and Therapeutics
  Academic article
• 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; Fossmark, Reidar. (2005) Idiopathic gastric acid hypersecretion. European Journal of Gastroenterology and Hepathology
  Reader opinion piece
• Waldum, Helge; Gustafsson, Bjørn; Fossmark, Reidar; Qvigstad, Gunnar. (2005) Antiulcer drugs and gastric cancer. Digestive Diseases and Sciences
  Academic literature review
• Mahler, M; Heidtmann, W; Niewiesk, S; Gruber, A; Fossmark, Reidar; Beil, W. (2005) Experimental Helicobacter pylori infection induces antral-predominant, chronic active gastritis in hispid cotton rats (Sigmodon hispidus). Helicobacter
  Academic article
• Nørsett, Kristin; Lægreid, Astrid; Langaas, Mette; Wørlund, Sara Maria; Fossmark, Reidar; Waldum, Helge. (2005) Molecular characterization of rat gastric mucosal response to potent acid inhibition. Physiological Genomics
  Academic article
• Gustafsson, Bjørn; Tømmerås, Karin; Nordrum, Ivar Skjåk; Loennechen, Jan Pål; Brunsvik, Anders; Solligård, Erik. (2005) Long-term serotonin administration induces heart valve disease in rats. Circulation
  Academic article
• Zhao, Chun-Mei; Fossmark, Reidar; Martinsen, Tom Christian; Kawase, Shiro; Chen, Duan; Waldum, Helge. (2005) Dedifferentiation of enterochromaffin-like cells in gastric cancer of hypergastrinemic cotton rats. APMIS - Journal of Pathologiy, Microbiology and Immunology
  Academic article
• Fossmark, Reidar; Zhao, Chun-Mei; Martinsen, Tom Christian; Kawase, Shiro; Chen, Duan; Waldum, Helge. (2005) Dedifferentiation of enterochromaffin-like cells in gastric cancer of cotton rats. APMIS - Journal of Pathologiy, Microbiology and Immunology
  Academic article

2004

• Fossmark, R; Martinsen, Tom Christian; Bakkelund, Karin Elvenes; Kawase, S; Torp, Sverre Helge; Waldum, Helge. (2004) Hypergastrinaemia induced by partial corpectomy results in development of enterochromaffin-like cell carcinoma in male Japanese cotton rats. Scandinavian Journal of Gastroenterology
  Academic article
• Fossmark, Reidar; Martinsen, Tom Christian; Torp, Sverre Helge; Kawase, S; Sandvik, Arne Kristian; Waldum, Helge. (2004) Spontaneous enterochromaffin-like cell carcinomas in cotton rats (Sigmodon hispidus) are prevented by a somatostatin analogue. Endocrine-Related Cancer
  Academic article
• Fossmark, Reidar; Martinsen, Tom Christian; Bakkelund, Karin Elvenes; Kawase, S; Waldum, Helge. (2004) ECL-cell derived gastric cancer in male cotton rats dosed with the H2-blocker loxtidine. Cancer Research
  Academic article
• 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

2003

• 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
• Fossmark, Reidar; Martinsen, Tom Christian; Torp, S; Waldum, Helge. (2003) Spontaneous ECL cell carcinomas in cotton rats are prevented by a somatostatin analouge. Endocrine-Related Cancer
  Academic 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