2023

• Waldum, Helge; Martinsen, Tom Christian. (2023) Uforstand å tro at biologiske funksjoner kan fjernes uten konsekvenser. Dagens medisin
  Reader opinion piece

2022

• 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

2021

• Waldum, Helge; Martinsen, Tom Christian. (2021) Chronic diseases: what about infections of virus and prions via the gut?. Therapeutic Advances in Gastroenterology
  Academic literature review
• 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

• 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
• 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
• 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
• Basso, Trude; Nordbø, Svein Arne; Sundqvist, Erik; Martinsen, Tom Christian; Witsø, Eivind; Wik, Tina Strømdal. (2020) Transmission of infection from non-isolated patients with COVID-19 to healthcare workers. Journal of Hospital Infection
  Academic article

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
• 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
• 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

• Pedersen, Eirik Sylthe; Stornes, Tore; Rekstad, Lars Cato; Martinsen, Tom Christian. (2018) Is there a role for routine colonoscopy in the follow-up after acute appendicitis?. Scandinavian Journal of Gastroenterology
  Academic article

2016

• Waldum, Helge; Martinsen, Tom Christian. (2016) To the editor. JAMA Neurology
  Letter to the editor
• Waldum, Helge; Martinsen, Tom Christian. (2016) Proton Pump Inhibitors and Dementia Incidence. JAMA Neurology
  Reader opinion piece

2015

• Hauso, Øyvind; Martinsen, Tom Christian; Waldum, Helge. (2015) 5-Aminosalicylic acid, a specific drug for ulcerative colitis. Scandinavian Journal of Gastroenterology
  Academic literature review

2014

• 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

• Granlund, Atle Van Beelen; Flatberg, Arnar; Østvik, Ann Elisabet; Drozdov, Ignat; Gustafsson, Björn; Kidd, Mark. (2013) Whole Genome Gene Expression Meta-Analysis of Inflammatory Bowel Disease Colon Mucosa Demonstrates Lack of Major Differences between Crohn's Disease and Ulcerative Colitis. PLOS ONE
  Academic article

2012

• 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
• Granlund, Atle; Flatberg, Arnar; Østvik, Ann Elisabet; Drozdov, I; Gustafsson, Björn; Kidd, M. (2012) Dissecting the IBD Transcriptome. Inflammatory Bowel Diseases
  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

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
  Academic literature review
• Martinsen, Tom Christian; Benestad, Sylvie Lafond; Moldal, Torfinn; Waldum, Helge. (2011) Inhibitors of gastric acid secretion increase the risk of prion infection in mice. Scandinavian Journal of Gastroenterology
  Academic article

2010

• 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
• Martinsen, Tom Christian; Herter, Ralph; Dybdahl, Jan H.; Waldum, Helge. (2010) Bruk av TNF-ɑ-antistoff ved inflammatorisk tarmsykdom. Tidsskrift for Den norske legeforening (Tidsskriftet)
  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
• Martinsen, Tom Christian; Benestad, Sylvie Lafond; Moldal, Torfinn; Waldum, Helge. (2010) Inhibitors of Gastric Acid Secretion Increase the Risk of Prion Infection in Mice. Prion
  Abstract

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

• 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
• 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

2007

• 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; 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
• Sørhaug, Sveinung; Steinshamn, Sigurd Loe; Haaverstad, Rune; Nordrum, Ivar Skjåk; Martinsen, Tom Christian; Waldum, Helge. (2007) Expression of neuroendocrine markers in non-small cell lung cancer. APMIS - Journal of Pathologiy, Microbiology and Immunology
  Academic article
• 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

2006

• Martinsen, Tom Christian; Waldum, Helge. (2006) Gastric juice - a natural-born killer. Alimentary Pharmacology and Therapeutics
  Reader opinion piece
• Waldum, Helge; Martinsen, Tom Christian. (2006) Tobacco and cancer in the digestive tract. S. Karger
  Academic chapter/article/Conference paper

2005

• Waldum, Helge; Martinsen, Tom Christian; Brenna, Eiliv. (2005) Nonulcer dyspepsia and proton pump inhibitors. Gastroenterology
  Reader opinion piece
• Martinsen, Tom Christian; Bergh, Kåre; Waldum, Helge. (2005) Gastric juice: A barrier against infectious diseases. Basic & Clinical Pharmacology & Toxicology
  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
• 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
• Martinsen, Tom Christian; Bakke, Ingunn; Chen, Duan; Sandvik, Arne Kristian; Zahlsen, Kolbjørn; Aamo, T.. (2005) Ciprofibrate stimulates the gastrin-producing cell by acting luminally on antral PPAR-alfa. American Journal of Physiology - Gastrointestinal and Liver Physiology
  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

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
• Martinsen, Tom Christian; Bergh, Kåre; Waldum, Helge. (2004) Gastric juice: A barrier against infectious disease. Basic & Clinical Pharmacology
  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
• 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, 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

2003

• Martinsen, Tom Christian; Skogaker, Nan Elisabeth Tostrup; Waldum, Helge. (2003) Antral G-cells in rats during dosing with PPARa agonist: a morphometric and immunocytohcemical study. Medical Electron Microscopy
  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
• Grav, H.J.; Tronstad, K.J.; Gudbrandsen, O.A.; Berge, K; Fladmark, K.E.; Martinsen, Tom Christian. (2003) Changed energy state and increased mitochondrial beta-oxidation rate in liver of rats associated with lowered proton electrochemical potential and stimulated uncoupling protein 2 (UCP-2) expression. Evidence for peroxisome proliferator-activated receptor-alfa independent induction of UCP-2 expression. Evidence for peroxisome proliferator-activated receptor-alfa independt of UCP-2 expression. Journal of Biological Chemistry
  Academic article
• Martinsen, Tom Christian; Bakke, I; Chen, Duan; Aamo, T; Zahlsen, Kolbjørn; Waldum, Helge. (2003) Ciprofibrate stimulates the gastrin-producing cell by acting luminally on antral PPARa receptors. Gastroenterology
  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
• 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
• Grav, Hans J; Tronstad, Karl Johan; Gudbrandsen, Oddrun; Berge, Kjetil; Fladmark, Kari Espolin; Martinsen, Tom C. (2003) Changed Energy State and Increased Mitochondrial B-Oxidation Rate in Liver of Rats Associated with Lowered Proton Electrochemical Potential and Stimulated Uncoupling Protein 2 (UCP-2) Expression. Journal of Biological Chemistry
  Academic article

2002

• Martinsen, Tom Christian; Taylor, David M; Johnsen, Roar; Waldum, Helge. (2002) Gastric acidity protects mice against prion infection. Scandinavian Journal of Gastroenterology
  Academic article
• Waldum, Helge; Martinsen, Tom Christian. (2002) Magesyre beskytter mot kugalskap. Gemini
  Popular scientific article

2001

• Martinsen, T.C.; Waldum, Helge. (2001) Menneskegalskap eller kugalskap?. Under dusken : studentavisa i Trondheim
  Feature article

2000

• Waldum, Helge; Martinsen, T.C.; Brenna, Eiliv. (2000) Safety of proton pump inhibitors. Alimentary Pharmacology and Therapeutics
  Feature article

1998

• Waldum, Helge; Kvetnoi, Igor; Sylte, Rønnaug; Schulze, Britt; Martinsen, T.C.; Sandvik, AK. (1998) The effect of the peroxisome proliferator ciprofibrate on the gastric mucosa and particularly the gastrin cell. Journal of Molecular Endocrinology
  Academic article

1996

• Martinsen, T.C.; Nesjan, Nils; Rønning, Kirsten Sagmyr; Sandvik, AK; Waldum, Helge. (1996) The peroxisome-proliferator ciprofibrate induces hypergastrinemia without raising gastric pH. Carcinogenesis
  Academic article

1988

• Waldum, Helge; Kvetnoi, IM; Sylte, Rønnaug; Schulze, Britt; Martinsen, T.C.; Sandvik, AK. (1988) The effect of the peroxisomeproliferator ciprofibrate on the gastric mucosa and particularly the gastrin (G) cell. Journal of Molecular Endocrinology
  Academic article