2025

• Resell, Mathilde Victoria; Qvigstad, Gunnar; Wang, Timothy Cragin; Quante, Anne S.; González-Fernández, África; Gonzalez-Fernandez, Africa. (2025) Translational studies on pancreatic cancer and gastric cancer: A methodology in PhD thesis. Frontiers in Pharmacology
  Article in business/trade/industry journal
• Waldum, Helge. (2025) The need for a better classification system for gastric neoplasms. Nature Reviews Disease Primers
  Reader opinion piece
• Waldum, Helge; Modlin, Irvin. (2025) The central role of gastrin in Helicobacter pylori gastric carcinogenesis. Scandinavian Journal of Gastroenterology
  Academic literature review

2024

• Waldum, Helge. (2024) The Role of Gastric Juice in the Defence Against Common and Serious Diseases. Japanese Journal of Gastroenterology and Hepatology
  Academic literature review
• Waldum, Helge; Fossmark, Reidar. (2024) Eradication of Helicobacter pylori by a potassium-competitive acid blocker alone?.
  Feature article
• Waldum, Helge; Slupphaug, Geir. (2024) Correctly identifying the cells of origin is essential for tailoring treatment and understanding the emergence of cancer stem cells and late metastases. Frontiers in Oncology
  Academic literature review
• Waldum, Helge. (2024) Gastric Malignancies in United States in the Period From 2000 to 2018. Clinical Gastroenterology and Hepatology
  Reader opinion piece

2023

• Waldum, Helge. (2023) Taper nok mer på Helseplattformen enn på "Helge Ingstad". Dagens næringsliv
  Reader opinion piece
• Waldum, Helge. (2023) Conclusion that autoimmune gastritis does not predispose to gastric cancer is unproven. Gut
  Academic literature review
• Waldum, Helge. (2023) Conclusion that autoimmune gastritis does not predispose to gastric cancer is unproven. Gut
  Academic article
• Waldum, Helge; Martinsen, Tom Christian. (2023) Uforstand å tro at biologiske funksjoner kan fjernes uten konsekvenser. Dagens medisin
  Reader opinion piece
• Waldum, Helge. (2023) Helicobacter pylori: A Bacterium Influencing and Causing Most of the Diseases in the Upper Gastrointestinal Tract. An Overview with Respect to Pathogenesis and Treatment Based on Basic Physiology.
  Academic chapter/article/Conference paper
• Waldum, Helge; Mjønes, Patricia Gjertrud. (2023) Clear Cell Renal Cancer, a Tumour with Neuroendocrine Features Originating from the Erythropoietin-Producing Cell.
  Academic chapter/article/Conference paper
• Waldum, Helge; Fossmark, Reidar. (2023) Inflammation and Digestive Cancer. International Journal of Molecular Sciences
  Academic literature review
• Waldum, Helge; Mjønes, Patricia Gjertrud. (2023) The central role of gastrin in gastric cancer. Frontiers in Oncology
  Academic literature review
• Waldum, Helge. (2023) Dysfunction of von-Hippel Lindau factor causes reduced degradation of HIF leading to renal cancer. Hypoxia-inducible factor-prolyl hydroxylase enzyme inhibitors also lessen HIF destruction and could therefore increase renal cancer. Frontiers in Pharmacology
  Reader opinion piece

2022

• Waldum, Helge; Fossmark, Reidar. (2022) Proton pump inhibitors and mortality. Gastroenterology
  Reader opinion piece
• 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
• Waldum, Helge; Wiseth, Rune; Wahba, Alexander. (2022) Serotonin and valvular heart disease. Expert opinion on therapeutic targets
  Editorial
• Waldum, Helge. (2022) Risk of gastric and oesophageal adenocarcinomas following discontinuation of long-term proton-pump inhibitor therapy. Journal of gastroenterology
  Reader opinion piece
• Waldum, Helge; Wahba, Alexander. (2022) Serotonin—A Driver of Progressive Heart Valve Disease. Frontiers in Cardiovascular Medicine
  Academic literature review

2021

• Waldum, Helge. (2021) Tumor classification should be based on biology and not consensus: Re-defining tumors based on biology may accelerate progress, an experience of gastric cancer. Cancers
  Academic literature review
• 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
• 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
• Waldum, Helge; Fossmark, Reidar. (2021) Gastritis, Gastric Polyps and Gastric Cancer. International Journal of Molecular Sciences
  Academic literature review
• Waldum, Helge; Mjønes, Patricia. (2021) Time to classify tumours of the stomach and the kidneys according to cell of origin. International Journal of Molecular Sciences
  Academic literature review

2020

• Waldum, Helge; Mjønes, Patricia. (2020) Towards understanding of gastric cancer based upon physiological role of gastrin and ECL cells. Cancers
  Academic literature review
• 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
• Helgadottir, Holmfridur; Lund, Sigrun H; Gizurarson, Sveinbjörn; Waldum, Helge; Björnsson, Einar B. (2020) Pharmacokinetics of single and repeated oral doses of esomeprazole and gastrin elevation in healthy males and females. Scandinavian Journal of Gastroenterology
  Academic article
• Waldum, Helge. (2020) Reflections after 10 years as Editor, including 8 years as Editor-in-Chief in Scandinavian Journal of Gastroenterology. Scandinavian Journal of Gastroenterology
  Editorial
• Kjellman, Magnus; Knigge, Ulrich; Welin, Staffan; Thiis-Evensen, Espen; Grønbæk, H; Schalin-Jäntti, Camilla. (2020) A plasma protein biomarker strategy for detection of small intestinal neuroendocrine tumors. Neuroendocrinology
  Academic article
• Waldum, Helge. (2020) The Influence of the Pharmaceutical Industry on Medicine, as Exemplified by Proton Pump Inhibitors. Cambridge Scholars Publishing Cambridge Scholars Publishing
  Academic monograph
• Waldum, Helge. (2020) The increase in early-onset gastric carcinomas from 1995 is probably due to the introduction of proton pump inhibitors. Surgery
  Reader opinion piece
• Waldum, Helge. (2020) Gastrin drives gastric cancer due to oxyntic atrophy also after Helicobacter pylori eradication. Therap Adv Gastroenterol
  Reader opinion piece
• Waldum, Helge; Mjønes, Patricia. (2020) Correct Identification of Cell of Origin may Explain Many Aspects of Cancer: The role of Neuroendocrine Cells as Exemplified from the Stomach. International Journal of Molecular Sciences
  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

2019

• 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
• Waldum, Helge. (2019) Stomach Hormones.
  Chapter
• 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
• Waldum, Helge; Sørdal, Øystein Finset; Mjønes, Patricia. (2019) The enterochromaffin-like [ECL] cell-central in gastric physiology and pathology. International Journal of Molecular Sciences
  Academic literature review
• Waldum, Helge. (2019) Hypergastrinemia is the Pathogenetic Factor in Helicobacter Pylori Carcinogenesis. Clinical Consequences, Particularly for Treatment with Inhibitors of Gastric Acid Secretion. Japan Journal of Medicine
  Academic article
• Waldum, Helge; Rehfeld, Jens F.. (2019) Gastric cancer and gastrin: on the interaction of Helicobacter pylori gastritis and acid inhibitory induced hypergastrinemia. 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

• 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. (2018) Editorial: proton pump inhibitors (PPIs) and primary liver cancer. Alimentary Pharmacology and Therapeutics
  Editorial
• Valeur, Jørgen; Waldum, Helge. (2018) Surmaget. NGF-nytt
  Article in business/trade/industry journal
• 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. (2018) Evidensbasert medisin- er alene et for spinkelt grunnlag for klinisk praksis.
  Feature article
• 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

• Mjønes, Patricia; Sagatun, Liv; Nordrum, Ivar Skjåk; Waldum, Helge. (2017) Neuron-Specific Enolase as an Immunohistochemical Marker Is Better Than Its Reputation. Journal of Histochemistry and Cytochemistry
  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
• 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
• Waldum, Helge; Björnsson, Einar S.; Brenna, Eiliv. (2017) Chronic cholestatic liver diseases. Scandinavian Journal of Gastroenterology
  Reader opinion piece
• Waldum, Helge; Sagatun, Liv; Mjønes, Patricia. (2017) Gastrin and gastric cancer. Frontiers in Endocrinology
  Academic article
• Fossmark, Reidar; Waldum, Helge. (2017) Sykdommer i ventrikkel og duodenum.
  Chapter
• 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

2016

• Waldum, Helge; Martinsen, Tom Christian. (2016) To the editor. JAMA Neurology
  Reader opinion piece
• Zeinali, Fatemeh; Bakkelund, Karin Elvenes; Hauso, Øyvind; Loennechen, Jan Pål; Waldum, Helge. (2016) Assessment of radiofrequency ablation technique in development of aortic valve stenosis in rabbits. Scandinavian Journal of Laboratory Animal Science
  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
• Waldum, Helge. (2016) Proton pump inhibitors and gastric cancer. Tidsskrift for Den norske legeforening (Tidsskriftet)
  Reader opinion piece
• Waldum, Helge; Martinsen, Tom Christian. (2016) Proton Pump Inhibitors and Dementia Incidence. JAMA Neurology
  Reader opinion piece
• 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
• Waldum, Helge Lyder; Kleveland, Per Martin; Sørdal, Øystein Finset. (2016) Helicobacter pylori and gastric acid: An intimate and reciprocal relationship. Therapeutic Advances in Gastroenterology
  Academic literature review
• 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
• Waldum, Helge; Sørdal, Øystein Finset. (2016) Classification of epithelial malignant tumors - The differentiation between adenocarcinomas and neuroendocrine carcinomas. Applied immunohistochemistry & molecular morphology (Print)
  Academic literature review
• 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

2015

• Waldum, Helge. (2015) Re: E-sigaretter - til skade eller nytte?. Tidsskrift for Den norske legeforening (Tidsskriftet)
  Reader opinion piece
• Waldum, Helge. (2015) Re: E-sigaretter – til skade eller nytte? :. Tidsskrift for Den norske legeforening (Tidsskriftet)
  Reader opinion piece
• Grong, Eivind; Græslie, Hallvard; Munkvold, Bjørn; Arbo, Ingerid Brænne; Kulseng, Bård Eirik; Waldum, Helge. (2015) Gastrin secretion after bariatric surgery - response to a protein-rich mixed meal following roux-en-y gastric bypass and sleeve gastrectomy: a pilot study in normoglycemic women. Obesity 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
• Hauso, Øyvind; Martinsen, Tom Christian; Waldum, Helge. (2015) 5-Aminosalicylic acid, a specific drug for ulcerative colitis. Scandinavian Journal of Gastroenterology
  Academic literature review
• 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
• 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
• 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
• Waldum, Helge; Ringnes, Eva; Nordbø, Helene; Sørdal, Øystein Finset; Nordrum, Ivar Skjåk; Hauso, Øyvind. (2014) The normal neuroendocrine cells of the upper gastrointestinal tract lack E-cadherin. 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
• Østvik, Ann Elisabet; Sandvik, Arne Kristian; Damås, Jan Kristian; Waldum, Helge. (2014) Innate Immune Responses in Colonic Mucosa During Inflammatory Bowel Disease - Effects of TLR3 Signaling. Norges teknisk-naturvitenskapelige universitet Doktoravhandlinger ved NTNU, 1503-8181 (2014:118)
  Doctoral dissertation
• Zeinali, Fatemeh; Hauso, Øyvind; Wiseth, Rune; Moufack, Marcel; Waldum, Helge. (2014) Venous plasma serotonin is not a proper biomarker for pulmonary arterial hypertension. Scandinavian Cardiovascular Journal
  Academic article
• Yang, Hang; Qi, Haili; Ren, Jingli; Cui, Jing; Li, Zhenfeng; Waldum, Helge. (2014) Involvement of NF-κB/IL-6 Pathway in the Processing of Colorectal Carcinogenesis in Colitis Mice. International Journal of Inflammation
  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
• Waldum, Helge; Hauso, Øyvind. (2013) Gastric acid inhibitors may prevent/heal oxyntic lesions by reducing blood demand. Gut
  Reader opinion piece
• Østvik, Ann Elisabet; Granlund, Atle; Bugge, Marit; Nilsen, Nadra; Torp, Sverre Helge; Waldum, Helge. (2013) Enhanced expression of CXCL10 in inflammatory bowel disease: Potential role of mucosal toll-like 3 receptor stimulation. Inflammatory Bowel Diseases
  Academic article
• 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
• 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
• Fossmark, Reidar; Waldum, Helge. (2013) The Distressing Overuse of Gastric Acid Inhibitors. Digestive Diseases and Sciences
  Editorial
• 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
• Østvik, Ann Elisabet; Granlund, Atle Van Beelen; Torp, Sverre Helge; Flatberg, Arnar; Beisvag, Vidar; Waldum, Helge. (2013) Expression of Toll-like receptor-3 is enhanced in active inflammatory bowel disease and mediates the excessive release of lipocalin 2. Clinical and Experimental Immunology
  Academic article

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
• 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
• Bakkelund, Karin Elvenes; Nordrum, Ivar Skjåk; Fossmark, Reidar; Waldum, Helge. (2012) Gastric Carcinomas Localized to the Cardia. Gastroenterology Research and Practice
  Academic article
• Østvik, Ann Elisabet; Granlund, Atle Van Beelen; Torp, Sverre Helge; Flatberg, Arnar; Waldum, Helge; Espevik, Terje. (2012) Induction of Lipocalin-2 in Colonic Epithelial Cells in Inflammatory Bowel Disease. Inflammatory Bowel Diseases
  Abstract
• Østvik, Ann Elisabet; Nilsen, Nadra; Granlund, Atle; Torp, Sverre Helge; Flatberg, Arnar; Waldum, Helge. (2012) Enhanced expression of CXCL10 in inflammatory bowel disease-role of mucosal TLR3 stimulation. Journal of Crohn’s and Coltis Supplements
  Abstract
• Sørdal, Øystein; Qvigstad, Gunnar; Nordrum, Ivar Skjåk; Gustafsson, Björn; Waldum, Helge. (2012) In situ hybridization in human and rodent tissue by the use of a new and simplified method. Applied immunohistochemistry & molecular morphology (Print)
  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
• Granlund, Atle; Flatberg, Arnar; Østvik, Ann Elisabet; Drozdov, I; Gustafsson, Björn; Kidd, M. (2012) Dissecting the IBD Transcriptome. Inflammatory Bowel Diseases
  Abstract
• 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

• 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
• Stunes, Astrid Kamilla; Reseland, Janne Elin; Hauso, Øyvind; Kidd, Mark; Tømmerås, Karin; Waldum, Helge. (2011) Adipocytes express a functional system for serotonin synthesis, reuptake and receptor activation. Diabetes, obesity and metabolism
  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
• Granlund, Atle Van Beelen; Beisvag, Vidar; Torp, Sverre Helge; Flatberg, Arnar; Kleveland, Per Martin; Østvik, Ann Elisabet. (2011) Activation of REG family proteins in colitis. Scandinavian Journal of Gastroenterology
  Academic article
• 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
• 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
• Waldum, Helge. (2010) Protonpumpehemmere bør ikke selges reseptfritt. Tidsskrift for Den norske legeforening (Tidsskriftet)
  Reader opinion piece
• Waldum, Helge; Hauso, Øyvind. (2010) PPI-induced hypergastrinaemia and Barrett's mucosa: the fog thickens. Gut
  Reader opinion piece
• 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
• 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
• 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
• Waldum, Helge L.; Hauso, Øyvind; Sandvik, AK. (2010) PPI-induced hypergastrinemia and Barrett's mucosa: the fog thickens. Gut
  Reader opinion piece

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
• Haram, Per Magnus; Kemi, Ole Johan; Lee, SJ; Bendheim, MO; Al-Share, QY; Waldum, HL. (2009) Aerobic interval training vs. continuous moderate exercise in the metabolic syndrome of rats artificially selected for low aerobic capacity. Cardiovascular Research (CVR)
  Academic article
• Waldum, Helge. (2009) Proton pump inhibitors should not be sold without prescription. Tidsskrift for Den norske legeforening (Tidsskriftet)
  Reader opinion piece
• Waldum, Helge. (2009) This month in the Scandinavian Journal of Gastroenterology. Scandinavian Journal of Gastroenterology
  Editorial
• Tsolakis, Apostolos V; Grimelius, Lars; Stridsberg, Mats; Falkmer, Sture Emil; Waldum, Helge; Saras, Jan. (2009) Obestatin/ghrelin cells in normal mucosa and endocrine tumours of the stomach. European Journal of Endocrinology (EJE)
  Academic article
• 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

• Sørhaug, Sveinung; Steinshamn, Sigurd Loe; Munkvold, Bjørn; Waldum, Helge. (2008) Release of neuroendocrine products in the pulmonary circulation during intermittent hypoxia in isolated rat lung. Respiratory Physiology & Neurobiology (RESPNB)
  Academic article
• Sørhaug, Sveinung; Steinshamn, Sigurd Loe; Munkvold, Bjørn; Waldum, Helge. (2008) Release of neuroendocrine products in the pulmonary circulation during intermittent hypoxia in iisoltaed rat lung. Respiratory Physiology & Neurobiology (RESPNB)
  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
• 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
• 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
• Bye, Anja; Sørhaug, Sveinung; Ceci, Marcello; Høydal, Morten; Stølen, Tomas; Heinrich, Garrett. (2008) Carbon monoxide levels experienced by heavy smokers impair aerobic capacity and cardiac contractility and induce pathological hypertrophy. Inhalation Toxicology
  Academic article
• Hauso, Øyvind; Gustafsson, Bjorn; Kidd, Mark; Waldum, Helge; Drozdov, Ignat; Chan, Anthony. (2008) Neuroendocrine tumor epidemiology: contrasting Norway and North America. Cancer
  Academic article
• 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
• Hauso, Øyvind; Gustafsson, Bjørn; Nordrum, Ivar Skjåk; Waldum, Helge. (2008) The Effect of Terguride in Carbon Tetrachloride (CCL4)-Induced Liver Fibrosis in Rat. Experimental biology and medicine
  Academic article
• Waldum, Helge. (2008) Editorial August issue of Scandinavian Journal of Gastroenterology. Scandinavian Journal of Gastroenterology
  Editorial

2007

• Cui, Guanglin; Waldum, HL. (2007) Physiological and clinical significance of enterochromaffin-like cell activation in the regulation of gastric acid secretion. World Journal of Gastroenterology (WJG)
  Academic literature review
• Waldum, Helge; Qvigstad, Gunnar. (2007) Proton pump inhibitors and gastric neoplasia. Gut
  Reader opinion piece
• 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
• Hauso, Øyvind; Gustafsson, Bjørn; Waldum, Helge. (2007) Long slender cytoplasmic extensions: A common feature of neuroendocrine cells?. Journal of Neuroendocrinology (JNE)
  Academic article
• Westbroek, I; Waarsing, JH; Leeuwen, JPTM van; Waldum, Helge; Reseland, JE; Weinans, H. (2007) Long-term fluoxetine administration does not result in major changes in bone architecture and strength in growing rats. Journal of Cellular Biochemistry
  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
• Hauso, Øyvind; Gustafsson, Bjørn; Loennechen, Jan Pål; Stunes, Astrid Kamilla; Nordrum, Ivar Skjåk; Waldum, Helge. (2007) Long-term serotonin effects in the rat are prevented by terguride. Regulatory Peptides
  Academic article
• Nørsett, Kristin; Syversen, Unni; Waldum, Helge; Sandvik, Arne Kristian. (2007) Kromograninenes rolle i sekresjon fra neuroendokrine celler og som markør for neuroendokrin neoplasi. NBS-nytt
  Academic article
• Waldum, Helge; Qvigstad, Gunnar. (2007) Gastric neuroendocrine carcinomas associated with atrophic gastritis in the Norwegian lundehund (puffin dog). Carcinogenesis
  Academic article
• Erlandsen, Sten Even; Fykse, Vidar; Waldum, Helge; Sandvik, Arne Kristian. (2007) Octreotide induces apoptosis in the oxyntic mucosa. Molecular and Cellular Endocrinology
  Academic article

2006

• Sørhaug, Sveinung; Langhammer, Arnulf; Hveem, Kristian; Waldum, Helge; Steinshamn, Sigurd Loe. (2006) Increased serum levels of chromogranin A in male smokers with airway obstruction. European Respiratory Journal
  Academic article
• Fossmark, Reidar; Brenna, Eiliv; Waldum, Helge. (2006) pH 4.0. Scandinavian Journal of Gastroenterology
  Reader opinion piece
• Jianu, Constantin; Qvigstad, Gunnar; Waldum, Helge. (2006) Synergistic adenocarcinoma and carcinoid. Journal of Gastrointestinal and Liver Diseases
  Reader opinion piece
• Gustafsson, Bjørn; Bakke, Ingunn; Tømmerås, Karin; Waldum, Helge. (2006) A new method for visualization of gut mucosal cells, describing the enterochromaffin cell in the rat gastrointestinal tract. Scandinavian Journal of Gastroenterology
  Academic article
• Waldum, Helge. (2006) Juks i medisinsk forskning. Tidsskrift for Den norske legeforening (Tidsskriftet)
  Reader opinion piece
• 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
• 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
• Sørhaug, Sveinung; Steinshamn, Sigurd Loe; Nilsen, Odd Georg; Waldum, Helge. (2006) Chronic inhalation of carbon monoxide: Effects on the respiratory and cardiovascular system at doses corresponding to tobacco smoking. Toxicology
  Academic article
• Gustafsson, Bjørn; Thommesen, Liv; Tømmeras, K; Stunes, Astrid Kamilla; Tømmerås, Karin; Westbroek, Irene. (2006) Serotonin and fluoxetine modulate bone cell function in vitro. Journal of Cellular Biochemistry
  Academic article
• Waldum, Helge. (2006) Assessment of the risk of iatrogenic hypergastrinaemia from patients with gastrinoma. Basic & Clinical Pharmacology & Toxicology
  Reader opinion piece
• Waldum, Helge; Martinsen, Tom Christian. (2006) Tobacco and cancer in the digestive tract.
  Academic chapter/article/Conference paper
• Waldum, Helge; Kleveland, Per Martin; Sandvik, Arne Kristian; Brenna, Eiliv; Bakke, Ingunn. (2006) Gastrin and cell proliferation.
  Academic chapter/article/Conference paper
• Martinsen, Tom Christian; Waldum, Helge. (2006) Gastric juice - a natural-born killer. Alimentary Pharmacology and Therapeutics
  Reader opinion piece
• Gustafsson, Bjørn; Westbroek, I; Waarsing, JH; Waldum, Helge; Solligård, Erik; Brunsvik, Anders. (2006) Long-term serotonin administration leads to higher bone mineral density, affects bone architecture, and leads to higher femoral bone stiffness in rats. Journal of Cellular Biochemistry
  Academic article
• Bye, Anja; Sørhaug, Sveinung; Stølen, Tomas; Tjønna, Arnt Erik; Høydal, Morten Andre; Ellingsen, Øyvind. (2006) The effects of long-term carbon monoxide exposure on the cardiovascular system in rats. Atherosclerosis Supplements
  Abstract
• Bye, Anja; Sørhaug, Sveinung; Stølen, Tomas; Tjønna, Arnt Erik; Høydal, Morten Andre; Ellingsen, Øyvind. (2006) The effect of long-term carbon monoxide exposure on cardiovascular function in rats. European Journal of Cardiovascular Prevention & Rehabilitation
  Abstract
• Sandvik, Arne Kristian; Alsberg, Bjørn Kåre; Nørsett, Kristin; Yadetie, Fekadu; Waldum, Helge; Lægreid, Astrid. (2006) Gene expression analysis and clinical diagnosis. Clinica Chimica Acta
  Academic literature review
• Fykse, Vidar; Solligård, Erik; Bendheim, Marianne Østensen; Chen, Duan; Grønbech, Jon Erik; Sandvik, Arne Kristian. (2006) ECL cell histamine mobilization and parietal cell stimulation in the rat stomach studied by microdialysis and electron microscopy. Acta Physiologica
  Academic article
• 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. (2005) Korrupt forskning kan skade folkehelsen. Tidsskrift for Den norske legeforening (Tidsskriftet)
  Reader opinion piece
• Waldum, Helge. (2005) Norsk lærebok i gastrointestinal ultralydundersøkelse. Tidsskrift for Den norske legeforening (Tidsskriftet)
  Book 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; 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. (2005) Nobelpris for Helicobacter pylori. Tidsskrift for Den norske legeforening (Tidsskriftet)
  Editorial
• Westbroek, I; Gustafsson, Bjørn; Waarsing, E; Waldum, Helge; Weinans, H; Leeuwen, JPT van. (2005) Neurotransmitter, serotonin, affects cortical bone architecture in rat femur. Bone
  Abstract
• Waldum, Helge; Fossmark, Reidar. (2005) Idiopathic gastric acid hypersecretion. European Journal of Gastroenterology and Hepathology
  Reader opinion piece
• Waldum, Helge. (2005) Hypergastrinaemia in patients infected with Helicobacter pylori treated with proton pump inhibitors. Gut
  Reader opinion piece
• Waldum, Helge; Martinsen, Tom Christian; Brenna, Eiliv. (2005) Nonulcer dyspepsia and proton pump inhibitors. Gastroenterology
  Reader opinion piece
• Waldum, Helge; Gustafsson, Bjørn; Fossmark, Reidar; Qvigstad, Gunnar. (2005) Antiulcer drugs and gastric cancer. Digestive Diseases and Sciences
  Academic literature review
• Martinsen, Tom Christian; Bergh, Kåre; Waldum, Helge. (2005) Gastric juice: A barrier against infectious diseases. Basic & Clinical Pharmacology & Toxicology
  Academic literature review
• Petersen, H; Schumacher, KP; Waldum, HL; Berstad, A; Florholmen, Jon; Selbekk, B. (2005) Gjensidig evaluering som kvalitetssikringsmetode for sykehusenheter. Tidsskrift for Den norske legeforening (Tidsskriftet)
  Academic article
• Sandvik, Arne Kristian; Alsberg, Bjørn Kåre; Nørsett, Kristin; Yadetie, Fekadu; Waldum, Helge; Lægreid, Astrid. (2005) Gene expression analysis and clinical diagnosis. Clinica Chimica Acta
  Academic literature review
• 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
• Gustafsson, Bjørn; Warsing, E; Leeuwen, H Van; Stunes, Astrid Kamilla; Thommesen, Liv; Waldum, Helge. (2005) Anti-depressants, depressing effects on bone?. Journal of Bone and Mineral Research
  Abstract
• Fykse, Vidar; Coy, JH; Waldum, Helge; Sandvik, Arne Kristian. (2005) The effect of the somatostatin-receptor 2 (SSTR2) on exocrine and endocrine secretion of the rat stomach. British Journal of Pharmacology
  Academic article
• Fykse, Vidar; Sandvik, Arne Kristian; Waldum, Helge. (2005) A one-year follow-up study of patients with ECL cell carcinoids after treatment with octreotide LAR. Scandinavian Journal of Gastroenterology
  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
• Gustafsson, Bjørn; Westbroek, I; Waarsing, E; Thommesen, Liv; Stunes, Astrid Kamilla; Waldum, Helge. (2005) Long-term serotonin administration affects cortical bone architecture and increases bone mineral density in rats. Journal of Bone and Mineral Research
  Abstract

2004

• Viste, Asgaut; Øvrebø, Kjell; Maartmann-Moe, Helga; Waldum, Helge. (2004) Lanzoprazole promotes gastric carcinogenesis in rats with duodenogastric reflux. Gastric Cancer
  Academic article
• Qvigstad, Gunnar; Fløttum, O; Waldum, Helge. (2004) Kapselendoskopi-en ny metode for diagnostikk av sykdom i tynntarm. Tidsskrift for Den norske legeforening (Tidsskriftet)
  Academic article
• Martinsen, Tom Christian; Bergh, Kåre; Waldum, Helge. (2004) Gastric juice: A barrier against infectious disease. Basic & Clinical Pharmacology
  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
• Viste, Asgaut; Øvrebø, Kjell; Maartman-Moe, Helga; Waldum, Helge. (2004) Lanzoprazole promotes gastric carcinogenesis in rats with duodenogastric reflux. Gastric Cancer
  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
• Qvigstad, Gunnar; Waldum, Helge. (2004) Rebound hypersecretion after inhibition of gastric acid secretion. Basic & Clinical Pharmacology
  Academic article
• Nørsett, Kristin; Lægreid, Astrid; Midelfart, Herman; Erlandsen, Sten Even; Falkmer, Sture Emil; Grønbech, Jon Erik. (2004) Gene expression based classification of gastric carcinoma. Cancer Letters
  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
• 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
• Brenna, Ø; Qvigstad, G.; Brenna, Eiliv; Waldum, Helge. (2004) Cytotoxicity of streptozotocin on neuroendocrine cells of the pancreas an the gut. Digestive Diseases and Sciences
  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

• Yadetie, Fekadu; Lægreid, Astrid; Bakke, Ingunn; Kusnierczyk, Waclaw; Komorowski, Jan; Waldum, Helge. (2003) Liver gene expression in rats in response to the peroxisome proliferator-activated receptor-alpha agonist ciprofibrate. Physiological Genomics
  Academic article
• Waldum, Helge; Qvigstad, G; Sandvik, Arne Kristian. (2003) Reg protein in gastric cancer tumour cells.
  Feature article
• Grav, Hans J; Tronstad, Karl J.; Gudbrandsen, Oddrun A.; Berge, Kjetil; Fladmark, Kari E.; Martinsen, Tom C.. (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. Journal of Biological Chemistry
  Academic article
• Yadetie, Fekadu; Lægreid, Astrid; Bakke, I; Kusnierczyk, W; Komorowski, Jan; Waldum, Helge. (2003) Liver gene expression in rats in response to the peroxisome proliferator-activated receptor alpha agonist ciprofibrate. Physiological Genomics
  Academic article
• Gustafsson, Bjørn; Thommesen, Liv; Waldum, Helge; Syversen, Unni. (2003) Serotonin affects bone metabolism in vitro and leads to increased bone mineral density (BMD) in female rats. Journal of Bone and Mineral Research
  Abstract
• 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
• Loenneche, Jan P.; Nilsen, Odd Georg; Arbo, Ingerid; Aadahl, Petter; Nilsen, Turid; Waldum, Helge. (2003) Chronic Exposure to Carbon Monoxide and Nicotine: Endothelin ETA Receptor Antagonism Attenuates Carbon Monoxide-Induced Myocardial Hypertrophy in Rat. Toxicology and Applied Pharmacology
  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
• Zhao, Chun-Mei; Wang, X; Friis-Hansen, L; Waldum, Helge; Halgunset, Jostein; Wadstrøm, T. (2003) Chronic Helicobacter pylori infection results in gastric hypoacidity and hypergastrinemia in wild-type mice but vagally induced hypersecretion in gastrin-deficient mice. Regulatory Peptides
  Academic article
• Waldum, Camilla; Zhao, Chun-Mei; Waldum, Helge; Halgunset, Jostein; Chen, Duan. (2003) Cheese-induced body weight gain is not accompanied by an increase of gastric cells producing leptin, gastrin, or pancreastatin in mice. Scandinavian Journal of Laboratory Animal Science
  Academic article
• Yadetie, Fekadu; Lægreid, Astrid; Bakke, Ingunn; Kusnierczyk, Waclaw; Komorowski, Jan; Waldum, Helge. (2003) Liver gene expression in rats in response to the peroxisome proliferator-activated receptor-{alpha} agonist ciprofibrate. Physiological Genomics
  Academic article
• Waldum, C.; Zhao, C.M.; Waldum, Helge; Halgunset, Jostein; Chen, Duan. (2003) Cheese-induced body weight is not accompained by an increase of gastric cells producing leptin, ghrelin, gastrin, or pancreastatin in mice. Scandinavian Journal of Laboratory Animal Science
  Academic article
• Nørsett, Kristin; Lægreid, Astrid; Midelfart, H; Yadetie, Fekadu; Erlandsen, S.E.; Falkmer, Sture Emil. (2003) Gene expression based classification of gastric carcinoma. Cancer Letters
  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
• 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
• Zhao, C-M; Wang, X.; Friis-Hansen, L; Waldum, Helge; Halgunset, Jostein; Wadstrøm, T. (2003) Chronic Helicobacter pylori infection results in gastric hypoacidity and hypergastrinemia in wild-type mice but vagally induced hypersecretion in gastroindeficient mice. Regulatory Peptides
  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
• Bakke, Ingunn; Yadetie, Fekadu; Sandvik, Arne Kristian; Kusnierczyk, W; Waldum, Helge; Lægreid, Astrid. (2003) DNA microarray analysis of liver gene expression in rats after longterm treatment with ciprofibrate. Physiological Genomics
  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; 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
• Waldum, Helge. (2003) Protonpumpehemmere og kronisk behov.
  Feature article
• Waldum, Helge. (2003) Autoritært styre uten autoritet og legimitet.
  Feature article
• Waldum, Helge; Brenna, E. (2003) Discussion on the effect of chronic hypergastrinemia on human enterochromaffin-like cells: insights from patients with sporadic gastrinomas.
  Feature article
• Waldum, Helge. (2003) Acute cholestatic hepatitis associated with celocoxib.
  Feature article
• Hoff, J.M.; Waldum, Helge. (2003) Klinisk ledelse og akademisk kompetanse.
  Feature article

2002

• Waldum, Helge; Martinsen, Tom Christian. (2002) Magesyre beskytter mot kugalskap. Gemini
  Popular scientific 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
• Cui, Guanglin; Sandvik, Arne Kristian; Munkvold, Bjørn; Waldum, Helge. (2002) Glycine-extended gastrin-17 stimulates acid secretion only via CCK-2 receptor-induced histamine release in the totally isolated vascularly perfused rat stomach. Acta Physiologica Scandinavica
  Academic article
• Waldum, Helge. (2002) Legemiddelbehandling av irritabel tarmsyndrom. Tidsskrift for Den norske legeforening (Tidsskriftet)
  Academic article
• Waldum, Helge; Brenna, Eiliv. (2002) Gastro-oesophageal reflux disease in general practice. Last year's guidelines are probably biased.
  Feature article
• Waldum, Helge; Brenna, Eiliv; Sandvik, Arne Kristian. (2002) Long-term safety of proton pump inhibitors: risks of gastric neoplasia and infections. Expert Opinion on Drug Safety
  Academic article
• Bergeijk, Jeroen D van; Wilson, Paul JH; Nielsen, Ole Haage; Tirpitz, Christian von; Karvonen, Anna-Lusa; Lygren, Idar. (2002) Octreotide in patients with active ulcerative colitis treated with high dose corticosteroids (OPUS 1). European Journal of Gastroenterology and Hepathology
  Academic article
• Bakke, Ingunn; Hammer, Tommy Arild; Sandvik, Arne Kristian; Waldum, Helge. (2002) PPAR alpha stimulates the rat gastrin-producing cell. Molecular and Cellular Endocrinology
  Academic article
• 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
• Waldum, Helge; Kleveland, Per Martin; Sandvik, Arne Kristian; Brenna, Eiliv; Syversen, Unni; Bakke, Ingunn. (2002) The cellular localization of the cholecystokinin 2 (gastrin) receptor in the stomach. Pharmacology and Toxicology
  Academic article
• Waldum, Helge. (2002) Irritabel tarm - oppspinn eller gravalvor?.
  Feature article
• Waldum, Helge; Sandvik, Arne Kristian. (2002) GRP and stimulation of acid secretion.
  Feature article
• Tømmerås, Karin; Bakke, Ingunn; Sandvik, Arne Kristian; Larsson, Erik; Waldum, Helge. (2002) Rat parietal cell express CCK-2 receptor mRNA: gene expression analysis of single cells isolated by laser-assisted microdissection. Biochemical and Biophysical Research Communications - BBRC
  Academic article
• Cui, Guanglin; Sandvik, Arne Kristian; Munkvold, Bjørn; Waldum, Helge. (2002) Effects of anaesthetic agents on gastrin-stimulated and histamine-stimulated gastric acid secretion in the totally isolated vascularly perfused rat stomach. Scandinavian Journal of Gastroenterology
  Academic article
• 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. (2002) Funksjonelle mage- og tarmlidelser. Tidsskrift for Den norske legeforening (Tidsskriftet)
  Academic article

2001

• Syversen, Unni; Bakke, I; Slørdahl, KW; Waldum, HL. (2001) The PPAR-alpha agonist Wyeth 14643 increases bone mineral density in female rats. Journal of Bone and Mineral Research
  Academic article
• Waldum, Helge. (2001) Medisinstudiet gir for liten biologisk kompetanse.
  Feature 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
• Kleveland, Ola; Syversen, Unni; Slørdahl, Kari; Waldum, Helge. (2001) Enterochromaffin-like (ECL) cell hyperplasia/neoplasia as a source of chromogranin A (CgA) increase in blood. Digestion
  Academic article
• Zhao, Chun-Mei; Bakke, Ingunn; Tostrup-Skogaker, Nan; Waldum, Helge; Håkanson, Rolf; Chen, Duan. (2001) Functionally impaired, hypertrophic ECL cells accumulate vacuoles and lipofuscin bodies. An ultrastructural study of ECL cells isolated from hypergastrinemic rats. Cell and Tissue Research
  Academic article
• Waldum, Helge; Qvigstad, G; Falkmer, Sture Emil. (2001) Indications for a neuroendocrine tumor-carcinoma sequence. Virchows Archiv
  Academic article
• Martinsen, T.C.; Waldum, Helge. (2001) Menneskegalskap eller kugalskap?.
  Feature article
• Sandvik, Arne Kristian; Cui, Guanglin; Bakke, Ingunn; Waldum, Helge. (2001) PACAP stimulates gastric acid secretion in the rat by inducing histamine release. American Journal of Physiology
  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
• Cui, Guanglin; Syversen, Unni; Zhao, Chun-Mei; Chen, Duan; Waldum, Helge. (2001) Long-term omeprazole treatment suppress body weight gain and bone mineralization in young male rats. Scandinavian Journal of Gastroenterology
  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
• 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
• Sandvik, Arne Kristian; Cui, Guanglin; Bakke, Ingunn; Munkvold, Bjørn; Waldum, Helge. (2001) PACAP stimulates gastric acid secretion in the rat, but also in man. Gastroenterology
  Academic article
• Sandvik, Arne Kristian; Cui, Guanglin; Bakke, Ingunn; Munkvold, Bjørn; Waldum, Helge. (2001) PACAP stimulates gastric acid secretion in the rat by histamine release and a direct effect on the parietal cell. Gastroenterology
  Academic article
• Cui, G.-L.; Syversen, Unni; Chao, Chun-Mei; Chen, Duan; Waldum, Helge. (2001) Long-term Omeprazole treatment Suppresses Body Weight Gain and Bone Mineralization in Young Male Rats. Scandinavian Journal of Gastroenterology
  Academic article
• Waldum, Helge; Brenna, Eiliv. (2001) Reply: on gastric polyps, proton pump inhibitors and long-term risks. Alimentary Pharmacology and Therapeutics
  Academic article
• Waldum, Helge. (2001) The safety of proton pump inibitors. Alimentary Pharmacology and Therapeutics
  Academic article
• Chen, Duan; Zhao, Chun-Mei; Falkmer, Sture Emil; Waldum, Helge; Syder, Andrew; Gordon, Jeffrey. (2001) Ablation of Parietal Cells Is Associated with ECL-cell Hyperplasia in Transgenic Mice with a Genetically Engineered Ablation of Their Parietal Cell Lineage. Gastroenterology
  Academic article
• Waldum, Helge. (2001) Serum chromogranin A in the control of patients on long-term treatment with inhibitors of acid secretion.
  Feature article
• Waldum, Helge; Qvigstad, G; Falkmer, Sture Emil. (2001) Letter to the editor.
  Feature article
• Zhao, Chun-Mei; Bakke, Ingunn; Skogaker, Nan Elisabeth Tostrup; Waldum, Helge; Håkanson, Rolf; Chen, Duan. (2001) Functionally impaired, hypertrophic ECL cells accumulate vacuoles and lipofuscin bodies. An ultrastructural study of ECL cells isolated from hypergastrinemic rats. Cell and Tissue Research
  Academic article
• Waldum, Helge; Syversen, Unni. (2001) Serum chromogranin A in the control of patients on long-term treatment with inhibitors of acid secretion. European Journal of Clinical Investigation
  Academic article
• Waldum, Helge; Qvigstad, G; Falkmer, Sture Emil. (2001) Letter to the Editor. Virchows Archiv
  Academic article

2000

• Syversen, Unni; Waldum, HL; Slørdahl, K; Chen, D. (2000) Synergistic effects of the pesticides toxaphene and dieldrin on bone mineral density in female rats. Journal of Bone and Mineral Research
  Academic article
• Waldum, Helge; Martinsen, T.C.; Brenna, Eiliv. (2000) Safety of proton pump inhibitors.
  Feature article
• Waldum, Helge; Sandvik, AK; Brenna, Eiliv. (2000) The mechanism of histamine secretion from gastric enterochromaffin-like cells.
  Feature article
• Waldum, Helge; Brenna, Eiliv; Sandvik, AK. (2000) The mechanism of histamine secretion from gastric enterochromaffin-like cells.
  Feature article
• Waldum, Helge; Mårvik, Ronald; Grønbech, Jon Erik; Sandvik, AK; Aase, Steinar. (2000) Oxyntic lesions may be provoked in the rat both by the process of acid secretion and also by gastric acidity. Alimentary Pharmacology and Therapeutics
  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
• Waldum, Helge. (2000) Karsinoider i ventrikkelen. Norsk Neuroendokrin Tumor Gruppe Norsk Neuroendokrin Tumor Gruppe
  Report
• 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
• Bakke, Ingunn; Sandvik, AK; Waldum, Helge. (2000) Octreotide inhibits the enterochromaffin-like cell, but not peroxisome proliferator-induced hypergastrinemia. Journal of Molecular Endocrinology
  Academic article
• Brenna, Eiliv; Flaaten, Borgar; Waldum, Helge; Myrvold, Helge Elliot. (2000) Behandling av oesophagusvaricer med strikkligatur. Tidsskrift for Den norske legeforening (Tidsskriftet)
  Academic article
• Qvigstad, G; Falkmer, Sture Emil; Waldum, Helge. (2000) Immunhistokjemisk diagnostikk ved bruk av tyramid signalamplifikasjon. Tidsskrift for Den norske legeforening (Tidsskriftet)
  Academic article
• Cui, Guanglin; Falkmer, Sture Emil; Sandvik, AK; Kawase, Shiro; Waldum, Helge. (2000) Spontaneous ECL omas in cotton rats (Sigmodon hispidus): tumours occurring in hypoacidic/hypergastrinemic animals with normal parietal cells. Carcinogenesis
  Academic article
• Waldum, Helge; Brenna, Eiliv. (2000) Rewiev article: is profound inhibition safe. Alimentary Pharmacology and Therapeutics
  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
• 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, Gunnar; Falkmer, Sture Emil; Waldum, Helge. (2000) Immunhistokjemisk diagnostikk ved bruk av tyramid-signalamplifikasjon. Tidsskrift for Den norske legeforening (Tidsskriftet)
  Academic article

1999

• Waldum, Helge; Sandvik, Arne Kristian; Angelsen, Anders; Krokan, Hans Einar; Falkmer, Sture Emil. (1999) Letter to the Editor: Re. Editorial entitled "The origin of gut and pancreatic neuroendocrine (APUD) cells - the last word?". Journal of Pathology
  Academic article
• Angelsen, Anders; Falkmer, Sture Emil; Sandvik, Arne Kristian; Waldum, Helge. (1999) Pre- and Postnatal Testosterone Administration Induces Proliferative Epithelial Lesions With Neuroendocrine Differentiation in the Dorsal Lobe of the Rat Prostate. The Prostate
  Academic article
• Syversen, Unni; Waldum, HL. (1999) Alendronate does not affect gastric secretion in female rats. Journal of Bone and Mineral Research
  Academic article
• Waldum, Helge; Rørvik, Hege; Falkmer, Sture Emil; Kawase, Shiro. (1999) Neuroendocrine (ECL Cell) Differentiation of Spontaneous Gastric Carcinomas of Cotton rats (Sigmodon hispidus). Laboratory animal science (Chicago)
  Academic article
• Waldum, Helge. (1999) Hypergastrinaemia with long-term omeprazole treatment.
  Feature article
• Jørgensen, Georg; Waldum, Helge. (1999) Lack f effect of transdermal nicotine on 3 cases of primary sclerosing cholangitis.
  Feature article
• Waldum, Helge; Syversen, Unni. (1999) Comments on "Prospective study of the value of serum chromogranin A or serum gastrin levels in the assessment of the presence, extent or growth of gastrinomas".
  Feature article
• Waldum, Helge; Brenna, Eiliv; Sandvik, AK. (1999) Risiko ved medikamentell syrehemming.
  Feature article
• Waldum, Helge; Qvigstad, G; Sandvik, AK. (1999) Letter to the editor. Authors' reply.
  Feature article
• Waldum, Helge; Sandvik, AK; Angelsen, Anders; Krokan, Hans Einar; Falkmer, Sture Emil. (1999) The origin of gut and pancreatic neuroendocrine (APUD) cells - the last word?.
  Feature article
• Waldum, Helge. (1999) ECL cell tumor and endocrine carcinoma of the stomach.
  Feature article
• Syversen, Unni; Nordsletten, Lars; Falch, Jan Arvid; Madsen, Jan Erik; Nilsen, Odd Georg; Waldum, Helge L.. (1999) Effect of Lifelong Nicotine Inhalation on Bone Mass and Mechanical Properties in Female Rat Femurs. Calcified Tissue International
  Academic article
• Angelsen, Anders; Falkmer, Sture Emil; Sandvik, AK; Waldum, Helge. (1999) Pre- and postnatal testosterone administration induces proliferative epithelial lesions with neuroendocrine differentiation in the dorsal lobe of the rat prostate. The Prostate
  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
• Loenneche, Jan P.; Beisvåg, Vidar; Arbo, Ingerid; Waldum, Helge; Sandvik, AK; Knardahl, Stein. (1999) Chronic carbon monoxide exposure in vivo induces myocardial endothelin-1 expression and hypertrophy in rat. Pharmacology and Toxicology
  Academic article
• Waldum, Helge; Rørvik, Hege; Falkmer, Sture Emil; Kawase, Shiro. (1999) Neuroendocrine (ECL cell) differentiation of spontaneous gastric carcinomas of cotton rats (Sigmodon hispidus). Laboratory animal science (Chicago)
  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
• Syversen, Unni; Norsletten, L.; Falch, J.A.; Madsen, J.E.; Nilsen, Odd Georg; Waldum, Helge. (1999) Effect of lifelong nicotine inhalation on bone mass and mechanical properties in female rat femurs. Calcified Tissue International
  Academic article
• Loennechen, Jan P.; Beisvag, Vidar; Arbo, Ingerid; Waldum, Helge L.; Sandvik, Arne K.; Knardahl, Stein. (1999) Chronic monoxide exposure in vivo induces myocardial endothelin-1 expression and hyperthrophy in rat. Pharmacology and Toxicology
  Academic article
• Syversen, Unni; Nordsletten, Lars; Falch, Jan Arvid; Madsen, Jan Erik; Nilsen, Odd Georg; Waldum, Helge L.. (1999) Effect of lifelong nicotine inhalation on bone mass and mechanical properties in female rat femurs. Calcified Tissue International
  Academic article
• Syversen, Unni; Nordsletten, Lars; Falch, Jan Arvid; Madsen, Jan Erik; Nilsen, Odd Georg; Waldum, Helge L.. (1999) Effect of lifelong nicotine inhalation on bone mass and mechanicaql properties in female rat femurs. Calcified Tissue International
  Academic 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
• Waldum, Helge; Sandvik, AK; Angelsen, Anders; Krokan, Hans Einar; Falkmer, S. (1999) Re. Editorial entitled "The origin of gut and pancreatic neuroendocrine (APUD) cells-the last word?". Journal of Pathology
  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
• Waldum, Helge; Sandvik, AK; Angelsen, Anders; Krokan, Hans Einar. (1999) The origin of gut and pancreatic neuroendocrine cells - the last word?. Journal of Pathology
  Academic article
• Waldum, Helge; Brenna, Eiliv; Sandvik, AK. (1999) Risikoen ved uttalt syrehemming. Tidsskrift for Den norske legeforening (Tidsskriftet)
  Academic article
• Waldum, Helge; Brenna, Eiliv; Sandvik, AK. (1999) Relationship of ECL cells and gastric neoplasia. The Yale Journal of Biology and Medicine
  Academic article
• Solhaug, Jan Helge; Pedersen, Hermod; Waldum, Helge L.; Ødegaard, Svein; Horn, Arild. (1999) Symposium: Forskning og forskningsmetodikk for klinikeren. Genteknikk. Glaxo Wellcome-støttet Faggruppe i Gastroenterologi Glaxo Wellcome-støttet Faggruppe i Gastroenterologi
  Non-fiction book

1998

• Waldum, Helge; Sandvik, AK; Idle, Jeffrey R. (1998) Gastrin is the most important factor in ECL tumorigenesis.
  Feature article
• Waldum, Helge. (1998) Kontingenten til Den norske lægeforening er økt med 32 prosent i løpet av fire år.
  Feature article
• Waldum, Helge. (1998) Svensk doktorgrad meritterer ikke i Norge.
  Feature article
• Waldum, Helge; Sandvik, AK; Idle, JR. (1998) Gastrin is the most important factor in ECL tumorigenesis.
  Feature article
• Kleveland, Per M; Waldum, Helge. (1998) Intragastric pH and Helicobacter pylori treatment with proton pump inhibitors combined with amoxicillin.
  Feature article
• Waldum, Helge. (1998) Fortrinnsrett til underordnede legestillinger ved sykehus.
  Feature article
• Waldum, Helge; Sandvik, AK. (1998) The relevance of luminal release is doubtful.
  Feature article
• Waldum, Helge. (1998) Behandling av antibiotikaindusert diare med homolog fæces.
  Feature article
• Sandvik, AK; Mårvik, Ronald; Dimaline, Rodney; Waldum, Helge. (1998) Carbachol stimulation of gastric acid secretion and its effect on the parietal cell. British Journal of Surgery
  Academic article
• Hammer, Tommy A.; Waldum, Helge. (1998) Peroksisomer og peroksisomproliferatorer. Interessante miljøgifter og terapeutika med effekt på fettstoffskifte og hormonfrigjøring. Tidsskrift for Den norske legeforening (Tidsskriftet)
  Academic article
• 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
• Waldum, Helge; Nordbø, Svein A.; Bevanger, Lars Solbu. (1998) A bismuth salt inhibits Herpes Simplex Virus. Microbial Ecology in Health and Disease
  Academic article
• Hammer, Tommy A.; Sandvik, AK; Waldum, Helge. (1998) Potentiating hypergastrinemic effect by the peroxisome proliferator ciprofibrate and omeprazole in the rat. Scandinavian Journal of Gastroenterology
  Academic article
• Angelsen, Anders; Sandvik, AK; Syversen, Unni; Stridsberg, Mats; Waldum, Helge. (1998) NGF-_b, NE-cells and prostatic cancer cell lines. A study of neuroendocrine expression in the human prostatic cancer cell lines DU-145, PC-3, LNCaP, and TSU-pr1 folowing stimulation of the nerve growth factor-_b. Scandinavian Journal of Urology and Nephrology
  Academic article
• 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
• Waldum, Helge; Brenna, Eiliv; Sandvik, AK; Syversen, Unni. (1998) Hormones and carcinogenesis. Endocrine-Related Cancer
  Academic article
• Waldum, Helge; Brenna, Eiliv; Sandvik, AK. (1998) Maximal gastric acid secretion in man :a concept that needs precision. Scandinavian Journal of Gastroenterology
  Academic article
• Waldum, Helge; Aase, Steinar; Kvetnoi, Igor; Brenna, Eiliv; Sandvik, AK; Syversen, Unni. (1998) Neuroendocrine differentiation in human gastric carcinoma. Cancer
  Academic article
• Waldum, Helge; Brenna, E.; Sandvik, A.K; Syversen, Unni; Falkmer, Sture Emil. (1998) Hormones and carcinogenes. Endocrine-Related Cancer
  Academic article
• Waldum, Helge; Sandvik, AK.; Idle, JR. (1998) Gastrin is the most important factor in ECL tumorigenesis. Gastroenterology
  Academic article

1997

• Angelsen, Anders; Mecsei, Reidun; Sandvik, AK; Waldum, Helge. (1997) Neuroendocrine cells in the prostate of the rat, guinea pig, cat, and dog. The Prostate
  Academic article
• Waldum, Helge. (1997) Budesonid (Entocort) depotkapsler i behandlingen av Crohns sykdom. Therapia medica
  Academic article
• Kvetnoy, I.; Sandvik, AK; Waldum, Helge. (1997) The diffuse neuroendocrine system and extrapineal melatonin. Journal of Molecular Endocrinology
  Academic article
• Kleveland, Per Martin; Waldum, Helge; Brenna, Eiliv; Aase, Steinar; Mæland, Johan A.. (1997) Relationship between the effiacy of amoxicillin and intragastric pH for the treatment of Helicobacter pylori infection. Helicobacter
  Academic article
• Mårvik, Ronald; Sandvik, AK; Waldum, Helge. (1997) Gastrin stimulates histamine release from the isolated pig stomach. Scandinavian Journal of Gastroenterology
  Academic article
• Sandvik, AK; Brenna, Eiliv; Sundan, Anders; Holst, J.J.; Waldum, Helge. (1997) Bombesin inhibits histamine release from the rat oxyntic mucosa by a somatostatin-dependent mechanism. Scandinavian Journal of Gastroenterology
  Academic article
• Angelsen, Anders; Syversen, Unni; Haugen, Olav Anton; Stridsberg, Mats; Mjølnerød, Ove Kristian; Waldum, Helge. (1997) Neuroendocrine differentiation in carcinomas of the prostate : do neuroendocrine serum markers reflect immunohistochemical findings?. The Prostate
  Academic article
• Støa-Birketvedt, G.; Waldum, Helge; Vonen, B.; Florholmen, J.. (1997) Effect of cimetidine on basal and postprandial plasma concentrations of cholecystokinin and gastrin in humans. Acta Physiologica Scandinavica
  Academic article
• Mårvik, Ronald; Sandvik, AK; Waldum, Helge. (1997) Evaluation of biologic gastrin activity of compound CI-988 in the isolated, vascularly perfused rat stomach. Scandinavian Journal of Gastroenterology
  Academic article
• Kvetnoy, Igor M.; Yuzhakov, Vadim V.; Sandvik, AK; Waldum, Helge. (1997) Melatonin in mast cells and tumor radiosensitivity. Journal of Pineal Research
  Academic article
• Angelsen, Anders; Syversen, Unni; Stridsberg, Mats; Haugen, Olav Anton; Mjølnerød, Ove Kristian; Waldum, Helge. (1997) Use of neuroendocrine serum markers in the follow-up of patients with cancer of the prostate. The Prostate
  Academic article
• Sandvik, AK; Brenna, Eiliv; Waldum, Helge. (1997) Review article: The pharmacological inhibition of gastric acid secretion : tolerance and rebound. Alimentary Pharmacology and Therapeutics
  Academic article
• Syversen, Unni; Heide, Liv S.; Waldum, Helge. (1997) Kromogranin A i blod : en nyttig tumormarøkr. Tidsskrift for Den norske legeforening (Tidsskriftet)
  Academic article
• Arnestad, J.S.; Kleveland, Per Martin; Waldum, Helge. (1997) In single doses ranitidine effervescent is more effective than lansoprazole in decreasing gastric acidity. Alimentary Pharmacology and Therapeutics
  Academic article
• Brenna, Eiliv; Kleveland, Per Martin; Waldum, Helge. (1997) En enkel metode for endoskopisk plassering av nasojejunal ernæringssonde. Tidsskrift for Den norske legeforening (Tidsskriftet)
  Academic article
• Valen, Guro; Sellei, Peter; Öwall, Anders; Eriksson, Elsa; Kallner, Anders; Waldum, Helge. (1997) Release of markers of myocardial and endothelial injury following cold cardioplegic arrest in pigs. Scandinavian Cardiovascular Journal
  Academic article

1996

• Syversen, Unni; Nordsletten, L; Falch, JA; Nilsen, OG; Waldum, HL. (1996) Effect of lifelong nicotine inhalation on bone mass and mechanical properties in femora of female rats. Journal of Bone and Mineral Research
  Academic article
• 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
• Waldum, Helge; Syversen, Unni; Sandvik, AK. (1996) Karosinoider. Sandoz informasjon
  Academic article
• Syversen, Unni; Opsjøn, Sissel L.; Stridsberg, Mats; Sandvik, Arne Kristian; Dimaline, Rod; Tingulstad, Solveig. (1996) Chromogranin A and pancreastatin-like immunoreactivity in normal pregnancies. Journal of Clinical Endocrinology and Metabolism (JCEM)
  Academic article
• Waldum, Helge; Arnestad, J.S.; Brenna, Eiliv; Syversen, Unni; Sandvik, AK. (1996) Marked increase in gastric acid secretory capacity after omeprazole treatment. Gut
  Academic article
• Rønning, Kirsten Sagmyr; Sandvik, AK; Waldum, Helge. (1996) The fade of gastrin-stimulated gastric acid secretion in the rat is due to depletion of releasable mucosal histamine. Acta Physiologica Scandinavica
  Academic article
• Waldum, Helge; Nilsen, Odd Georg; Nilsen, Turid; Rørvik, Hege; Syversen, Unni; Sandvik, AK. (1996) Long-term effects of inhaled nicotine. Life Sciences
  Academic article
• Waldum, Helge L.; Bakka, Arne; Horn, A.; Nordgård, K. (1996) Gastrointestinal cancer. GFG Symposium, Oslo. Gastrointestinal cancer Gastrointestinal cancer
  Non-fiction book

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
• Waldum, Helge; Brenna, Eiliv; Sandvik, AK; Syversen, Unni. (1988) Hormones and carcinogenesis. Endocrine-Related Cancer
  Academic article

1986

• Kleveland, Per Martin; Waldum, Helge; Bjerve, Kristian S; Fjøsne, Hans Erikssønn. (1986) Bioassay of gastrin using the totally isolated vascularly perfused rat stomach. A biomodel sensitive to gastrin in physiological concentrations. Scandinavian Journal of Gastroenterology
  Academic article