2023

• 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. volum 55 (01).
  Vitenskapelig artikkel
• Fossmark, Reidar; Fasting, Magnus Hølmo. (2023) Dysplasi og tidlig kreft i øsofagus. NGF-nytt.
  Faglig artikkel

2022

• 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. volum 149 (3).
  Vitenskapelig artikkel
• Beck, Marianne; Bringeland, Erling Audun; Qvigstad, Gunnar; Fossmark, Reidar. (2022) Ventrikkelcancer oversett ved gastroskopi i Midt-Norge 2007-2016 – En populasjonsbasert studie. NGF-nytt. volum 29 (1).
  Faglig artikkel
• 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. volum 58 (4).
  Short communication
• Ness-Jensen, Eivind; Bringeland, Erling Audun; Mjønes, Patricia; Lagergren, Jesper; Grønbech, Jon Erik; Waldum, Helge; Fossmark, Reidar. (2022) Hypergastrinemia and mortality in gastric adenocarcinoma: a population-based cohort study, the HUNT study. Scandinavian Journal of Gastroenterology. volum 57 (5).
  Vitenskapelig artikkel
• 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. volum 28 (8).
  Brev til redaktøren
• Olaisen, Maya; Richard, Mathias L.; Beisvag, Vidar; Granlund, Atle van Beelen; Røyset, Elin Synnøve; Rué, Olivier; Martinsen, Tom Christian; Sandvik, Arne Kristian; Sokol, Harry; Fossmark, Reidar. (2022) The ileal fungal microbiota is altered in Crohn's disease and is associated with the disease course. Frontiers in medicine. volum 9.
  Vitenskapelig artikkel
• Sandvik, Elfrid Christine Smith; Aasarød, Kristin Matre; Johnsen, Gjermund; Hoff, Dag Arne Lihaug; Kulseng, Bård Eirik; Hyldmo, Åsne Ask; Græslie, Hallvard; Nymo, Siren; Sandvik, Jorunn; Fossmark, Reidar. (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. volum 11 (16).
  Vitenskapelig artikkel
• Waldum, Helge; Fossmark, Reidar. (2022) Proton pump inhibitors and mortality. Gastroenterology. volum 164 (6).
  Brev til redaktøren

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. volum 14:101095.
  Vitenskapelig artikkel
• 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. volum 13 (22).
  Vitenskapelig artikkel
• 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. volum 13 (16).
  Vitenskapelig artikkel
• 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. volum 14.
  Vitenskapelig artikkel
• Ness-Jensen, Eivind; Bringeland, Erling Audun; Mjønes, Patricia; Lagergren, Jesper; Grønbech, Jon Erik; Waldum, Helge; Fossmark, Reidar. (2021) HYPERGASTRINEMIA IS NOT ASSOCIATED WITH INCREASED MORTALITY IN GASTRIC ADENOCARCINOMA. United European Gastroenterology journal. volum 9.
  Sammendrag/abstract
• Waldum, Helge; Fossmark, Reidar. (2021) Gastritis, Gastric Polyps and Gastric Cancer. International Journal of Molecular Sciences. volum 22 (12).
  Vitenskapelig oversiktsartikkel/review

2020

• Aasarød, Kristin Matre; Waldum, Helge; Stunes, Astrid Kamilla; Sandvik, Arne Kristian; Flatberg, Arnar; Mjønes, Patricia; Syversen, Unni; Bakke, Ingunn; Fossmark, Reidar. (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. volum 21 (3).
  Vitenskapelig artikkel
• 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. volum 35.
  Vitenskapelig artikkel
• 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. volum 14 (January).
  Sammendrag/abstract
• Ness-Jensen, Eivind; Bringeland, Erling Audun; Mattsson, Fredrik; Lagergren, Jesper; Grønbech, Jon Erik; Waldum, Helge; Fossmark, Reidar. (2020) Hypergastrinemia is associated with proximal and intestinal type gastric adenocarcinoma. Gastroenterology. volum 158 (6).
  Sammendrag/abstract
• Ness-Jensen, Eivind; Bringeland, Erling Audun; Mattsson, Fredrik; Mjønes, Patricia; Lagergren, Jesper; Grønbech, Jon Erik; Waldum, Helge; Fossmark, Reidar. (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. volum 148.
  Vitenskapelig artikkel
• Olaisen, Maya; Flatberg, Arnar; Granlund, Atle van Beelen; Røyset, Elin Synnøve; Martinsen, Tom Christian; Sandvik, Arne Kristian; Fossmark, Reidar. (2020) Bacterial Mucosa-associated Microbiome in Inflamed and Proximal Noninflamed Ileum of Patients With Crohn's Disease. Inflammatory Bowel Diseases.
  Vitenskapelig artikkel
• Olaisen, Maya; Flatberg, Arnar; Granlund, Atle van Beelen; Røyset, Elin Synnøve; Martinsen, Tom Christian; Sandvik, Arne Kristian; Fossmark, Reidar. (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. volum 14 (January).
  Sammendrag/abstract
• Olaisen, Maya; Fossmark, Reidar. (2020) Nytt om 5-ASA ved ulcerøs colitt.
  Nettsider (opplysningsmateriale)

2019

• Fossmark, Reidar; Balto, Tine Marie; Martinsen, Tom Christian; Grønbech, Jon Erik; Munkvold, Bjørn; Mjønes, Patricia; Waldum, Helge. (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. volum 54 (8).
  Vitenskapelig artikkel
• Fossmark, Reidar; Martinsen, Tom Christian; Waldum, Helge. (2019) Adverse effects of proton pump inhibitors – evidence and plausibility. International Journal of Molecular Sciences. volum 20:5203 (20).
  Vitenskapelig oversiktsartikkel/review
• 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. volum 20:6031 (23).
  Vitenskapelig oversiktsartikkel/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. volum 49 (12).
  Short communication
• Olaisen, Maya; Spigset, Olav; Flatberg, Arnar; Granlund, Atle van Beelen; Brede, wenche Rødseth; Albrektsen, Grethe; Røyset, Elin Synnøve; Gilde, Bodil; Sandvik, Arne Kristian; Martinsen, Tom Christian; Fossmark, Reidar. (2019) Mucosal 5-aminosalicylic acid concentration, drug formulation and mucosal microbiome in patients with quiescent ulcerative colitis. Alimentary Pharmacology and Therapeutics. volum 49 (10).
  Vitenskapelig artikkel
• Waldum, Helge; Fossmark, Reidar. (2019) Enterochromaffin-like (ECL) Cells. Encyclopedia of Gastroenterology 2nd Edition.
  Faglig kapittel
• Waldum, Helge; Fossmark, Reidar. (2019) Role of Autoimmune Gastritis in Gastric Cancer. Clinical and Translational Gastroenterology. volum 10 (9).
  Vitenskapelig artikkel

2018

• Waldum, Helge; Fossmark, Reidar. (2018) Proton pump inhibitors and gastric cancer: a long expected side effect finally reported also in man. Gut. volum 67 (1).
  Short communication
• Waldum, Helge; Fossmark, Reidar. (2018) Types of gastric carcinomas. International Journal of Molecular Sciences. volum 19.
  Vitenskapelig oversiktsartikkel/review
• Waldum, Helge; Öberg, Kjell; Sørdal, Øystein Finset; Sandvik, Arne Kristian; Gustafsson, Björn; Mjønes, Patricia; Fossmark, Reidar. (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. volum 11.
  Vitenskapelig oversiktsartikkel/review
• Waldum, Helge; Sørdal, Øystein Finset; Fossmark, Reidar. (2018) Proton pump inhibitors (PPIs) may cause gastric cancer – clinical consequences. Scandinavian Journal of Gastroenterology. volum 53 (6).
  Vitenskapelig oversiktsartikkel/review

2017

• Fossmark, Reidar; Waldum, Helge. (2017) Sykdommer i ventrikkel og duodenum. Indremedisin I & II.
  Faglig kapittel
• Mjønes, Patricia; Nordrum, Ivar Skjåk; Sørdal, Øystein Finset; Sagatun, Liv; Fossmark, Reidar; Sandvik, Arne Kristian; Waldum, Helge. (2017) Expression of the cholecystokinin-B receptor in neoplastic gastric cells. Discover Oncology. volum 9.
  Vitenskapelig artikkel
• Vange, Pål; Bruland, Torunn; Doseth, Berit; Fossmark, Reidar; Sousa, Mirta; Beisvag, Vidar; Sørdal, Øystein Finset; Qvigstad, Gunnar; Waldum, Helge; Sandvik, Arne Kristian; Bakke, Ingunn. (2017) The cytoprotective protein clusterin is overexpressed in hypergastrinemic rodent models of oxyntic preneoplasia and promotes gastric cancer cell survival. PLOS ONE. volum 12 (9).
  Vitenskapelig artikkel

2016

• Aasarød, Kristin Matre; Mosti, Mats Peder; Stunes, Astrid Kamilla; Reseland, Janne Elin; Basso, Trude; Syversen, Unni; Fossmark, Reidar. (2016) Impaired skeletal health in patients with chronic atrophic gastritis. Scandinavian Journal of Gastroenterology. volum 51 (7).
  Vitenskapelig artikkel
• Aasarød, Kristin Matre; Ramezanzadehkoldeh, Masoud; Shabestari, Maziar; Mosti, Mats Peder; Stunes, Astrid Kamilla; Reseland, Janne Elin; Beisvag, Vidar; Eriksen, Erik Fink; Sandvik, Arne Kristian; Erben, Reinhold; Schüler, Christiane; Boyce, Malcolm; Skallerud, Bjørn Helge; Syversen, Unni; Fossmark, Reidar. (2016) Skeletal effects of a gastrin receptor antagonist in H+/K+ATPase beta subunit KO mice. Journal of Endocrinology. volum 230 (2).
  Vitenskapelig artikkel
• Aasarød, Kristin Matre; Stunes, Astrid Kamilla; Mosti, Mats Peder; Ramezanzadehkoldeh, Masoud; Viggaklev, Bjørn Ivar; Reseland, Janne Elin; Skallerud, Bjørn Helge; Fossmark, Reidar; Syversen, Unni. (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. volum 117 (9).
  Vitenskapelig artikkel
• Boyce, Malcolm; Moore, Andrew; Sagatun, Liv; Parsons, Bryony; Varro, Andrea; Campbell, Fiona; Fossmark, Reidar; Waldum, Helge; Pritchard, D. Mark. (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. volum 83 (3).
  Vitenskapelig artikkel
• 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. volum 124 (7).
  Vitenskapelig artikkel
• Fossmark, Reidar; Rao, Shalini; Mjønes, Patricia; Munkvold, Bjørn; Flatberg, Arnar; Varro, Andrea; Thommesen, Liv; Nørsett, Kristin. (2016) PAI-1 deficiency increases the trophic effects of hypergastrinemia in the gastric corpus mucosa. Peptides. volum 79.
  Vitenskapelig artikkel
• Ness-Jensen, Eivind; Fossmark, Reidar. (2016) Adverse Effects of Proton Pump Inhibitors in Chronic Kidney Disease. JAMA Internal Medicine. volum 176 (6).
  Brev til redaktøren
• Ness-Jensen, Eivind; Fossmark, Reidar. (2016) To the editor. JAMA Internal Medicine. volum 176 (6).
  Brev til redaktøren
• Sagatun, Liv; Fossmark, Reidar; Jianu, Constantin-Sergiu; Qvigstad, Gunnar; Nordrum, Ivar Skjåk; Mjønes, Patricia; Waldum, Helge. (2016) Follow-up of patients with ECL cell-derived tumours. Scandinavian Journal of Gastroenterology. volum 51 (11).
  Vitenskapelig artikkel
• 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. volum 28 (11).
  Vitenskapelig artikkel
• 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. volum 51 (7).
  Vitenskapelig oversiktsartikkel/review

2015

• Ausen, Kjersti; Fossmark, Reidar; Spigset, Olav; Pleym, Hilde. (2015) Randomized clinical trial of topical tranexamic acid after reduction mammoplasty. British Journal of Surgery. volum 102 (11).
  Vitenskapelig artikkel
• 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. volum 123 (6).
  Vitenskapelig artikkel
• 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. volum 50 (3).
  Vitenskapelig artikkel
• Waldum, Helge; Hauso, Øyvind; Fossmark, Reidar. (2015) Letter: Proton pump inhibitors, hypergastrinaemia and the risk of gastric neoplasia. Alimentary Pharmacology and Therapeutics. volum 42 (3).
  Brev til redaktøren
• Waldum, Helge; Kleveland, Per Martin; Fossmark, Reidar. (2015) Upper gastrointestinal physiology and diseases. Scandinavian Journal of Gastroenterology. volum 50 (6).
  Vitenskapelig artikkel

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.
  Sammendrag/abstract
• 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. volum 49 (7).
  Vitenskapelig artikkel
• 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. volum 50 (3).
  Vitenskapelig artikkel
• 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. volum 49 (10).
  Vitenskapelig artikkel
• Waldum, Helge; Hauso, Øyvind; Fossmark, Reidar. (2014) The regulation of gastric acid secretion - clinical perspectives. Acta Physiologica. volum 210 (2).
  Vitenskapelig oversiktsartikkel/review
• 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. volum 60 (6).
  Vitenskapelig artikkel
• Walenkamp, A; Crespo, G; Fierro Maya, F; Fossmark, Reidar; Igaz, P; Rinke, A; Tamagno, G; Vitale, G; Öberg, Kjell; Meyer, T. (2014) Hallmarks of gastrointestinal neuroendocrine tumours: Implications for treatment. Endocrine-Related Cancer. volum 21 (6).
  Vitenskapelig oversiktsartikkel/review

2013

• Fossmark, Reidar; Bretthauer, Michael; Gustafsson, Björn. (2013) Who should perform endoscopies? (Hvem bør utføre endoskopier?). Tidsskrift for Den norske legeforening. volum 133 (11).
  Short communication
• 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.
  Vitenskapelig artikkel
• Fossmark, Reidar; Suren, Pål; Waldum, Helge. (2013) Karakterer på medisinstudiet bør gjeninnføres. Dagens medisin.
  Brev til redaktøren
• 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. volum 184.
  Vitenskapelig artikkel
• Fossmark, Reidar; Waldum, Helge. (2013) Development of diffuse carcinomas in the gastric corpus in patients with rugal hyperplastic gastritis. International Journal of Cancer. volum 133 (9).
  Leserinnlegg
• Fossmark, Reidar; Waldum, Helge. (2013) The Distressing Overuse of Gastric Acid Inhibitors. Digestive Diseases and Sciences. volum 58 (3).
  Leder
• Skarsvåg, Espen Christoffer; Hjort-Hansen, Henrik; Fossmark, Reidar. (2013) Symptomatic primary (AL) amyloidosis in the stomach and duodenum. BestPractice Gastroenterologi.
  Faglig artikkel
• Vigen, Alexander; Kodama, Yosuke; Viset, Trond; Fossmark, Reidar; Waldum, Helge; Kidd, Mark; Wang, Timothy C.; Modlin, Irvin; Chen, Duan; Zhao, Chun-Mei. (2013) Immunohistochemical evidence for an impairment of autophagy in tumorigenesis of gastric carcinoids and adenocarcinomas in rodent models and patients. Histology and Histopathology. volum 28 (4).
  Vitenskapelig artikkel
• 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. volum 73 (2).
  Vitenskapelig artikkel

2012

• Bakkelund, Karin Elvenes; Nordrum, Ivar Skjåk; Fossmark, Reidar; Waldum, Helge. (2012) Gastric Carcinomas Localized to the Cardia. Gastroenterology Research and Practice.
  Vitenskapelig artikkel
• 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. volum 177 (1-3).
  Vitenskapelig artikkel
• Fossmark, Reidar; Stunes, Astrid Kamilla; Petzold, Christiane; Waldum, Helge; Rubert, Marina; Lian, Aina-Mari; Reseland, Janne Elin; Syversen, Unni. (2012) Decreased bone mineral density and reduced bone quality in H+/K+ ATPase beta-subunit deficient mice. Journal of Cellular Biochemistry. volum 113 (1).
  Vitenskapelig artikkel
• 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. volum 96.
  Sammendrag/abstract
• Fossmark, Reidar; Sørdal, Øystein Finset; Jianu, Constantin-Sergiu; Qvigstad, Gunnar; Nordrum, Ivar Skjåk; Boyce, M; Waldum, Helge. (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. volum 36 (11-12).
  Vitenskapelig artikkel
• Jianu, Constantin-Sergiu; Fossmark, Reidar; Viset, Trond; Qvigstad, Gunnar; Sørdal, Øystein Finset; Mårvik, Ronald; Waldum, Helge. (2012) Gastric carcinoids after long-term use of a proton pump inhibitor. Alimentary Pharmacology and Therapeutics. volum 36 (7).
  Vitenskapelig artikkel
• Jianu, Constantin-Sergiu; Fossmark, Reidar; Waldum, Helge. (2012) Long-term use of proton pump inhibitors – consequences for the gastric mucosa. Best Practice Onkologi/Hematologi.
  Faglig artikkel
• Jianu, Constantin-Sergiu; Lange, Ove Juel; Viset, Trond; Qvigstad, Gunnar; Martinsen, Tom Christian; Fougner, Reidun Lyngvi; Kleveland, Per Martin; Fossmark, Reidar; Hauso, Øyvind; Waldum, Helge. (2012) Gastric neuroendocrine carcinoma after long-term use of proton pump inhibitor. Scandinavian Journal of Gastroenterology. volum 47 (1).
  Vitenskapelig artikkel
• 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. volum 47 (6).
  Vitenskapelig artikkel
• Vigen, Alexander; Kodama, Yosuke; Viset, Trond; Fossmark, Reidar; Waldum, Helge; Kidd, Mark; Wang, Timothy C.; Modlin, Irvin; Chen, Duan; Zhao, Chun-Mei. (2012) Impaired Autophagy in Gastric Carcinoids and Adenocarcinoma of Both Rodent Models and Patients. Gastroenterology. volum 142 (5).
  Sammendrag/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. volum 107 (2).
  Leserinnlegg

2011

• 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. volum 2011 (ID 975479).
  Vitenskapelig oversiktsartikkel/review
• Gustafsson, Björn; Bakke, Ingunn; Hauso, Øyvind; Kidd, Mark; Modlin, Irvin M; Fossmark, Reidar; Brenna, Eiliv; Waldum, Helge. (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. volum 46 (5).
  Vitenskapelig artikkel
• 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. volum 46 (4).
  Vitenskapelig artikkel
• 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. volum 2011.
  Vitenskapelig artikkel
• Stunes, Astrid Kamilla; Westbroek, Irene; Gustafsson, Björn; Fossmark, Reidar; Waarsing, Jan H; Eriksen, Erik Fink; Petzold, Christiane; Reseland, Janne Elin; Syversen, Unni. (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. volum 11 (11).
  Vitenskapelig artikkel

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. volum 45 (9).
  Vitenskapelig artikkel
• 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. volum 31 (5).
  Vitenskapelig artikkel
• Martinsen, Tom Christian; Skogaker, Nan E Tostrup; Fossmark, Reidar; Nordrum, Ivar Skjåk; Sandvik, Arne Kristian; Bendheim, Marianne Østensen; Bakkelund, Karin Elvenes; Waldum, Helge. (2010) Neuroendocrine Cells in Diffuse Gastric Carcinomas: An Ultrastructural Study With Immunogold Labeling of Chromogranin A. Applied immunohistochemistry & molecular morphology (Print). volum 18 (1).
  Vitenskapelig artikkel
• 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. volum 45 (4).
  Vitenskapelig oversiktsartikkel/review

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. volum 90 (1).
  Sammendrag/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. volum 44 (1).
  Vitenskapelig artikkel
• Waldum, Helge; Kleveland, Per Martin; Brenna, Eiliv; Bakke, Ingunn; Qvigstad, Gunnar; Martinsen, Tom Christian; Fossmark, Reidar; Gustafsson, Björn; Sandvik, Arne Kristian. (2009) Interactions between gastric acid secretagogues and the localization of the gastrin receptor. Scandinavian Journal of Gastroenterology. volum 44 (4).
  Vitenskapelig oversiktsartikkel/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. volum 43.
  Vitenskapelig artikkel
• 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. volum 43 (1).
  Vitenskapelig artikkel
• Fossmark, Reidar; Qvigstad, Gunnar; Waldum, Helge. (2008) Gastric cancer: Animal studies on the risk of hypoacidity and hypergastrinemia. World Journal of Gastroenterology (WJG). volum 14.
  Vitenskapelig oversiktsartikkel/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. volum 19.
  Sammendrag/abstract
• Nørsett, Kristin; Lægreid, Astrid; Kusnierczyk, Waclaw; Langaas, Mette; Ylving, S; Fossmark, Reidar; Myhre, Simen; Falkmer, Sture Emil; Waldum, Helge; Sandvik, Arne Kristian. (2008) Changes in gene expression of gastric mucosa during therapeutic acid inhibition. European Journal of Gastroenterology and Hepathology. volum 20.
  Vitenskapelig artikkel
• Waldum, Helge; Kleveland, Per Martin; Brenna, Eiliv; Bakke, Ingunn; Qvigstad, Gunnar; Martinsen, Tom Christian; Fossmark, Reidar; Gustafsson, Bjorn; Sandvik, Arne Kristian. (2008) Interactions between gastric acid secretagogues and the localization of the gastrin receptor. Scandinavian Journal of Gastroenterology.
  Vitenskapelig oversiktsartikkel/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. volum 43.
  Sammendrag/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. volum 27 (1).
  Vitenskapelig oversiktsartikkel/review

2007

• Fossmark, Reidar; Brenna, E; Waldum, HL. (2007) pH 4.0. Scandinavian Journal of Gastroenterology. volum 42.
  Leder
• 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. volum 34 (3).
  Vitenskapelig artikkel
• 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. volum 132 (4).
  Sammendrag/abstract
• 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. volum 43 (1).
  Vitenskapelig artikkel
• Fossmark, Reidar; Waldum, Helge. (2007) Rebound acid hypersecretion. Alimentary Pharmacology and Therapeutics. volum 25.
  Leserinnlegg

2006

• 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. volum 54.
  Vitenskapelig artikkel
• Fossmark, Reidar; Brenna, Eiliv; Waldum, Helge. (2006) pH 4.0. Scandinavian Journal of Gastroenterology. volum 41.
  Brev til redaktøren

2005

• 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. volum 21.
  Vitenskapelig artikkel
• Fossmark, Reidar; Martinsen, Tom Christian; Qvigstad, Gunnar; Bendheim, Marianne Østensen; Kopstad, G.; Kashima, K; Waldum, Helge; quigstad, gunnar. (2005) Ultrastructure and chromogranin A immunogold labelling of ECL cell carcinoids. APMIS - Journal of Pathologiy, Microbiology and Immunology. volum 113.
  Vitenskapelig artikkel
• Mahler, M; Heidtmann, W; Niewiesk, S; Gruber, A; Fossmark, Reidar; Beil, W; Hedrich, H; Wagner, S. (2005) Experimental Helicobacter pylori infection induces antral-predominant, chronic active gastritis in hispid cotton rats (Sigmodon hispidus). Helicobacter. volum 10.
  Vitenskapelig artikkel
• Waldum, Helge; Fossmark, Reidar. (2005) Idiopathic gastric acid hypersecretion. European Journal of Gastroenterology and Hepathology.
  Brev til redaktøren
• Waldum, Helge; Fossmark, Reidar; Qvigstad, Gunnar; Bakkelund, Karin Elvenes; Kawase, S. (2005) The Japanese cotton rat develops spontaneously an ECL cell derived gastric carcinoma. 6th International Gastric Cancer Congress.
  Vitenskapelig Kapittel/Artikkel/Konferanseartikkel
• 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. volum 113.
  Vitenskapelig artikkel
• 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. volum 113.
  Vitenskapelig artikkel
• Gustafsson, Bjørn; Tømmerås, Karin; Nordrum, Ivar Skjåk; Loennechen, Jan Pål; Brunsvik, Anders; Solligård, Erik; Fossmark, Reidar; Bakke, Ingunn; Syversen, Unni; Waldum, Helge. (2005) Long-term serotonin administration induces heart valve disease in rats. Circulation. volum 111 (12).
  Vitenskapelig artikkel
• Nørsett, Kristin; Lægreid, Astrid; Langaas, Mette; Wørlund, Sara Maria; Fossmark, Reidar; Waldum, Helge; Sandvik, Arne Kristian. (2005) Molecular characterization of rat gastric mucosal response to potent acid inhibition. Physiological Genomics. volum 22.
  Vitenskapelig artikkel
• Waldum, Helge; Gustafsson, Bjørn; Fossmark, Reidar; Qvigstad, Gunnar. (2005) Antiulcer drugs and gastric cancer. Digestive Diseases and Sciences. volum 50.
  Vitenskapelig oversiktsartikkel/review

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. volum 39 (10).
  Vitenskapelig artikkel
• 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. volum 64.
  Vitenskapelig artikkel
• Waldum, Helge; Fossmark, R; Bakke, Ingunn; Martinsen, Tom Christian; Qvigstad, G. (2004) Hypergastrinemia in animals and man: Causes and consequences. Scandinavian Journal of Gastroenterology. volum 39.
  Vitenskapelig oversiktsartikkel/review
• 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. volum 11 (1).
  Vitenskapelig artikkel

2003

• 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.
  Vitenskapelig artikkel
• Martinsen, Tom Christian; Kawase, Shiro; Håkanson, R; Torp, Sverre Helge; Fossmark, Reidar; Qvigstad, G; Sandvik, Arne Kristian; Waldum, Helge. (2003) SpontaneousECL cell carcinomas in cotton rats. Natural course and the effect of a gastrin receptor antagonist. Carcinogenesis. volum 24.
  Vitenskapelig artikkel
• Martinsen, Tom Christian; Kawase, Shiro; Håkanson, Rolf; Torp, Sverre Helge; Fossmark, Reidar; Qvigstad, G; Sandvik, Arne Kristian; Waldum, Helge. (2003) Spontaneous ECL cell carcinomas in cotton rats: natural course and prevention by a gastrin receptor antagonist. Carcinogenesis. volum 24 (12).
  Vitenskapelig artikkel