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Publications by Jørgen Jahnsen

170 publications found

Original articles

Ørbo HS, Bjørlykke KH, Sexton J, Jyssum I, Tveter AT, Christensen IE, Mjaaland S, Kvien TK, Grødeland G, Kro GB, Jahnsen J, Haavardsholm EA, Munthe LA, Provan SA, Vaage JT, Goll GL, Jørgensen KK, Syversen SW (2024)
Incidence and outcome of COVID-19 following vaccine and hybrid immunity in patients on immunosuppressive therapy: identification of protective post-immunisation anti-RBD antibody levels in a prospective cohort study
RMD Open, 10 (2)
DOI 10.1136/rmdopen-2023-003545, PubMed 38599653

Lindeman I, Høydahl LS, Christophersen A, Risnes LF, Jahnsen J, Lundin KEA, Sollid LM, Iversen R (2024)
Generation of circulating autoreactive pre-plasma cells fueled by naive B cells in celiac disease
Cell Rep, 43 (4), 114045 (in press)
DOI 10.1016/j.celrep.2024.114045, PubMed 38578826

Peyrin-Biroulet L, Arkkila P, Armuzzi A, Danese S, Ferrante M, Jordi Guardiola, Jahnsen J, Louis E, Lukáš M, Reinisch W, Roblin X, Smith PJ, Kwon T, Kim J, Yoon S, Kim DH, Atreya R (2024)
Comparative efficacy and safety of subcutaneous infliximab and vedolizumab in patients with Crohn's disease and ulcerative colitis included in randomised controlled trials
BMC Gastroenterol, 24 (1), 121
DOI 10.1186/s12876-024-03163-5, PubMed 38539103

Brun MK, Gehin JE, Bjørlykke KH, Warren DJ, Klaasen RA, Sexton J, Sandanger Ø, Kvien TK, Mørk C, Jahnsen J, Bolstad N, Jørgensen KK, Haavardsholm EA, Goll GL, Syversen SW (2024)
Clinical consequences of infliximab immunogenicity and the effect of proactive therapeutic drug monitoring: exploratory analyses of the randomised, controlled NOR-DRUM trials
Lancet Rheumatol, 6 (4), e226-e236
DOI 10.1016/S2665-9913(23)00341-7, PubMed 38402891

Das S, Stamnaes J, Kemppainen E, Hervonen K, Lundin KEA, Parmar N, Jahnsen FL, Jahnsen J, Lindfors K, Salmi T, Iversen R, Sollid LM (2023)
Separate Gut Plasma Cell Populations Produce Auto-Antibodies against Transglutaminase 2 and Transglutaminase 3 in Dermatitis Herpetiformis
Adv Sci (Weinh), 10 (25), e2300401
DOI 10.1002/advs.202300401, PubMed 37424036

Kalla R, Adams AT, Nowak JK, Bergemalm D, Vatn S, Ventham NT, Kennedy NA, Ricanek P, Lindstrom J, , Söderholm J, Pierik M, D'Amato M, Gomollón F, Olbjørn C, Richmond R, Relton C, Jahnsen J, Vatn MH, Halfvarson J, Satsangi J (2023)
Analysis of Systemic Epigenetic Alterations in Inflammatory Bowel Disease: Defining Geographical, Genetic and Immune-Inflammatory influences on the Circulating Methylome
J Crohns Colitis, 17 (2), 170-184
DOI 10.1093/ecco-jcc/jjac127, PubMed 36029471

Chauhan SK, Bartolomé Casado R, Landsverk OJB, Johannessen H, Phung D, Nilsen HR, Sætre F, Jahnsen J, Horneland R, Yaqub S, Aandahl EM, Lundin KEA, Bækkevold ES, Jahnsen FL (2023)
Human small intestine contains 2 functionally distinct regulatory T-cell subsets
J Allergy Clin Immunol, 152 (1), 278-289.e6
DOI 10.1016/j.jaci.2023.02.030, PubMed 36893861

Brun MK, Bjørlykke KH, Viken MK, Stenvik GE, Klaasen RA, Gehin JE, Warren DJ, Sexton J, Sandanger Ø, Kvien TK, Mørk C, Haavardsholm EA, Jahnsen J, Goll GL, Lie BA, Bolstad N, Jørgensen KK, Syversen SW (2023)
HLA-DQ2 is associated with anti-drug antibody formation to infliximab in patients with immune-mediated inflammatory diseases
J Intern Med, 293 (5), 648-655
DOI 10.1111/joim.13616, PubMed 36843323

Espeland K, Kleinauskas A, Juzenas P, Darvekar S, Vasovic V, Warloe T, Christensen E, Jahnsen J, Peng Q (2023)
Photodynamic Effects with 5-Aminolevulinic Acid on Cytokines and Exosomes in Human Peripheral Blood Mononuclear Cells from Patients with Crohn's Disease
Int J Mol Sci, 24 (5)
DOI 10.3390/ijms24054554, PubMed 36901982

Chlubnová M, Christophersen AO, Sandve GKF, Lundin KEA, Jahnsen J, Dahal-Koirala S, Sollid LM (2023)
Identification of gluten T cell epitopes driving celiac disease
Sci Adv, 9 (4), eade5800
DOI 10.1126/sciadv.ade5800, PubMed 36696493

Bjørlykke KH, Ørbo HS, Tveter AT, Jyssum I, Sexton J, Tran TT, Christensen IE, Kro GB, Kvien TK, Jahnsen J, Munthe LA, Chopra A, Warren DJ, Mjaaland S, Haavardsholm EA, Grødeland G, Provan SA, Vaage JT, Syversen SW, Goll GL, Jørgensen KK (2022)
Four SARS-CoV-2 vaccine doses or hybrid immunity in patients on immunosuppressive therapies: a Norwegian cohort study
Lancet Rheumatol, 5 (1), e36-e46
DOI 10.1016/S2665-9913(22)00330-7, PubMed 36415604

Syversen SW, Jyssum I, Tveter AT, Sexton J, Christensen IE, Tran TT, Bjørlykke KH, Mjaaland S, Warren DJ, Kvien TK, Chopra A, Kro GB, Jahnsen J, Munthe LA, Haavardsholm EA, Grødeland G, Vaage JT, Provan SA, Jørgensen KK, Goll GL (2022)
Immunogenicity and safety of a three-dose SARS-CoV-2 vaccination strategy in patients with immune-mediated inflammatory diseases on immunosuppressive therapy
RMD Open, 8 (2)
DOI 10.1136/rmdopen-2022-002417, PubMed 36328399

Zhou C, Østerbye T, Bach E, Dahal-Koirala S, Høydahl LS, Steinsbø Ø, Jahnsen J, Lundin KEA, Buus S, Sollid LM, Iversen R (2022)
Focused B cell response to recurring gluten motif with implications for epitope spreading in celiac disease
Cell Rep, 41 (4), 111541
DOI 10.1016/j.celrep.2022.111541, PubMed 36288703

Christensen IE, Jyssum I, Tveter AT, Sexton J, Tran TT, Mjaaland S, Kro GB, Kvien TK, Warren DJ, Jahnsen J, Munthe LA, Haavardsholm EA, Vaage JT, Grødeland G, Lund-Johansen F, Jørgensen KK, Syversen SW, Goll GL, Provan SA (2022)
The persistence of anti-Spike antibodies following two SARS-CoV-2 vaccine doses in patients on immunosuppressive therapy compared to healthy controls-a prospective cohort study
BMC Med, 20 (1), 378
DOI 10.1186/s12916-022-02587-8, PubMed 36199139

Nowak JK, Adams AT, Kalla R, Lindstrøm JC, Vatn S, Bergemalm D, Keita ÅV, Gomollón F, Jahnsen J, Vatn MH, Ricanek P, Ostrowski J, Walkowiak J, Halfvarson J, Satsangi J, (2022)
Characterisation of the Circulating Transcriptomic Landscape in Inflammatory Bowel Disease Provides Evidence for Dysregulation of Multiple Transcription Factors Including NFE2, SPI1, CEBPB, and IRF2
J Crohns Colitis, 16 (8), 1255-1268
DOI 10.1093/ecco-jcc/jjac033, PubMed 35212366

Bjørlykke KH, Jahnsen J, Brynskov J, Molander P, Eberhardson M, Davidsdottir LG, Sipponen T, Hjortswang H, Goll GL, Syversen SW, Langholz E, Jørgensen KK, Steenholdt C (2022)
Therapeutic drug monitoring in inflammatory bowel disease: implementation, utilization, and barriers in clinical practice in Scandinavia
Scand J Gastroenterol, 58 (1), 25-33
DOI 10.1080/00365521.2022.2108684, PubMed 35996928

Atlasy N, Bujko A, Bækkevold ES, Brazda P, Janssen-Megens E, Lundin KEA, Jahnsen J, Jahnsen FL, Stunnenberg HG (2022)
Single cell transcriptomic analysis of the immune cell compartment in the human small intestine and in Celiac disease
Nat Commun, 13 (1), 4920
DOI 10.1038/s41467-022-32691-5, PubMed 35995787

Syversen SW, Jyssum I, Tveter AT, Tran TT, Sexton J, Provan SA, Mjaaland S, Warren DJ, Kvien TK, Grødeland G, Nissen-Meyer LSH, Ricanek P, Chopra A, Andersson AM, Kro GB, Jahnsen J, Munthe LA, Haavardsholm EA, Vaage JT, Lund-Johansen F, Jørgensen KK, Goll GL (2022)
Immunogenicity and Safety of Standard and Third-Dose SARS-CoV-2 Vaccination in Patients Receiving Immunosuppressive Therapy
Arthritis Rheumatol, 74 (8), 1321-1332
DOI 10.1002/art.42153, PubMed 35507355

Buhl S, Steenholdt C, Brynskov J, Christensen KR, Dorn-Rasmussen M, Thomsen OØ, Bendtzen K, Klausen TW, Dahlerup JF, Thorsgaard N, Jahnsen J, Molazahi A, Pedersen N, Kjeldsen J, Almer S, Dahl EE, Vind I, Cannon AG, Marsal J, Sipponen T, Agnholt JS, Kievit HAL, Aure SL, Martinsen L, Meisner S et al. (2022)
Discontinuation of Infliximab Therapy in Patients with Crohn's Disease
NEJM Evid, 1 (8), EVIDoa2200061
DOI 10.1056/EVIDoa2200061, PubMed 38319804

Peyrin-Biroulet L, Arkkila P, Armuzzi A, Danese S, Guardiola J, Jahnsen J, Lees C, Louis E, Lukáš M, Reinisch W, Roblin X, Jang M, Byun HG, Kim DH, Lee SJ, Atreya R (2022)
Comparative efficacy and safety of infliximab and vedolizumab therapy in patients with inflammatory bowel disease: a systematic review and meta-analysis
BMC Gastroenterol, 22 (1), 291
DOI 10.1186/s12876-022-02347-1, PubMed 35676620

Brun MK, Goll GL, Jørgensen KK, Sexton J, Gehin JE, Sandanger Ø, Olsen IC, Klaasen RA, Warren DJ, Mørk C, Kvien TK, Jahnsen J, Bolstad N, Haavardsholm EA, Syversen SW (2022)
Risk factors for anti-drug antibody formation to infliximab: Secondary analyses of a randomised controlled trial
J Intern Med, 292 (3), 477-491
DOI 10.1111/joim.13495, PubMed 35411981

Vatn SS, Lindstrøm JC, Moen AEF, Brackmann S, Tannæs TM, Olbjørn C, Bergemalm D, Keita ÅV, Gomollon F, Detlie TE, Lüders T, Kalla R, Adams A, Satsangi J, Jahnsen J, Vatn MH, Halfvarson J, Ricanek P, Nilsen H, IBD-CHARACTER consortium (2022)
Mucosal Gene Transcript Signatures in Treatment Naïve Inflammatory Bowel Disease: A Comparative Analysis of Disease to Symptomatic and Healthy Controls in the European IBD-Character Cohort
Clin Exp Gastroenterol, 15, 5-25
DOI 10.2147/CEG.S343468, PubMed 35185343

Christophersen A, Dahal-Koirala S, Chlubnová M, Jahnsen J, Lundin KEA, Sollid LM (2022)
Phenotype-Based Isolation of Antigen-Specific CD4⁺ T Cells in Autoimmunity: A Study of Celiac Disease
Adv Sci (Weinh), 9 (10), e2104766
DOI 10.1002/advs.202104766, PubMed 35119226

Jelsness-Jørgensen LP, Moum B, Grimstad T, Jahnsen J, Hovde Ø, Frigstad SO, Bernklev T (2022)
The multidimensional fatigue inventory (MFI-20): psychometrical testing in a Norwegian sample of inflammatory bowel disease (IBD) patients
Scand J Gastroenterol, 1-7 (in press)
DOI 10.1080/00365521.2022.2029939, PubMed 35076321

Espeland K, Kleinauskas A, Juzenas P, Brech A, Darvekar S, Vasovic V, Warloe T, Christensen E, Jahnsen J, Peng Q (2022)
Photodynamic Effects with 5-Aminolevulinic Acid on Cytokines and Exosomes in Human Peripheral Blood Mononuclear Cells
Biomedicines, 10 (2)
DOI 10.3390/biomedicines10020232, PubMed 35203441

Jyssum I, Kared H, Tran TT, Tveter AT, Provan SA, Sexton J, Jørgensen KK, Jahnsen J, Kro GB, Warren DJ, Vaage EB, Kvien TK, Nissen-Meyer LH, Anderson AM, Grødeland G, Haavardsholm EA, Vaage JT, Mjaaland S, Syversen SW, Lund-Johansen F, Munthe LA, Goll GL (2021)
Humoral and cellular immune responses to two and three doses of SARS-CoV-2 vaccines in rituximab-treated patients with rheumatoid arthritis: a prospective, cohort study
Lancet Rheumatol, 4 (3), e177-e187
DOI 10.1016/S2665-9913(21)00394-5, PubMed 34977602

Syversen SW, Jørgensen KK, Goll GL, Brun MK, Sandanger Ø, Bjørlykke KH, Sexton J, Olsen IC, Gehin JE, Warren DJ, Klaasen RA, Noraberg G, Bruun TJ, Dotterud CK, Ljoså MKA, Haugen AJ, Njålla RJ, Zettel C, Ystrøm CM, Bragnes YH, Skorpe S, Thune T, Seeberg KA, Michelsen B, Blomgren IM et al. (2021)
Effect of Therapeutic Drug Monitoring vs Standard Therapy During Maintenance Infliximab Therapy on Disease Control in Patients With Immune-Mediated Inflammatory Diseases: A Randomized Clinical Trial
JAMA, 326 (23), 2375-2384
DOI 10.1001/jama.2021.21316, PubMed 34932077

Romstad KK, Detlie TE, Søberg T, Thomas O, Ricanek P, Jahnsen ME, Lerang F, Jahnsen J (2021)
Treatment and outcome of gastrointestinal bleeding due to peptic ulcers and erosions - (BLUE study)
Scand J Gastroenterol, 57 (1), 8-15
DOI 10.1080/00365521.2021.1988701, PubMed 34663154

Christophersen A, Zühlke S, Lund EG, Snir O, Dahal-Koirala S, Risnes LF, Jahnsen J, Lundin KEA, Sollid LM (2021)
Pathogenic T Cells in Celiac Disease Change Phenotype on Gluten Challenge: Implications for T-Cell-Directed Therapies
Adv Sci (Weinh), 8 (21), e2102778
DOI 10.1002/advs.202102778, PubMed 34495570

Frick R, Høydahl LS, Petersen J, du Pré MF, Kumari S, Berntsen G, Dewan AE, Jeliazkov JR, Gunnarsen KS, Frigstad T, Vik ES, Llerena C, Lundin KEA, Yaqub S, Jahnsen J, Gray JJ, Rossjohn J, Sollid LM, Sandlie I, Løset GÅ (2021)
A high-affinity human TCR-like antibody detects celiac disease gluten peptide-MHC complexes and inhibits T cell activation
Sci Immunol, 6 (62)
DOI 10.1126/sciimmunol.abg4925, PubMed 34417258

Bergemalm D, Andersson E, Hultdin J, Eriksson C, Rush ST, Kalla R, Adams AT, Keita ÅV, D'Amato M, Gomollon F, Jahnsen J, IBD Character Consortium, Ricanek P, Satsangi J, Repsilber D, Karling P, Halfvarson J (2021)
Systemic Inflammation in Preclinical Ulcerative Colitis
Gastroenterology, 161 (5), 1526-1539.e9
DOI 10.1053/j.gastro.2021.07.026, PubMed 34298022

Schuppan D, Mäki M, Lundin KEA, Isola J, Friesing-Sosnik T, Taavela J, Popp A, Koskenpato J, Langhorst J, Hovde Ø, Lähdeaho ML, Fusco S, Schumann M, Török HP, Kupcinskas J, Zopf Y, Lohse AW, Scheinin M, Kull K, Biedermann L, Byrnes V, Stallmach A, Jahnsen J, Zeitz J, Mohrbacher R et al. (2021)
A Randomized Trial of a Transglutaminase 2 Inhibitor for Celiac Disease
N Engl J Med, 385 (1), 35-45
DOI 10.1056/NEJMoa2032441, PubMed 34192430

Monstad IL, Solberg IC, Cvancarova M, Hovde O, Henriksen M, Huppertz-Hauss G, Gunther E, Moum BA, Stray N, Vatn M, Hoie O, Jahnsen J (2021)
Outcome of Ulcerative Colitis 20 Years after Diagnosis in a Prospective Population-based Inception Cohort from South-Eastern Norway, the IBSEN Study
J Crohns Colitis, 15 (6), 969-979
DOI 10.1093/ecco-jcc/jjaa232, PubMed 33367569

Detlie TE, Lindstrøm JC, Jahnsen ME, Finnes E, Zoller H, Moum B, Jahnsen J (2021)
Hypophosphatemia after high-dose intravenous iron treatment in patients with inflammatory bowel disease: Mechanisms and possible clinical impact
World J Gastroenterol, 27 (17), 2039-2053
DOI 10.3748/wjg.v27.i17.2039, PubMed 34007138

Kalla R, Adams AT, Bergemalm D, Vatn S, Kennedy NA, Ricanek P, Lindstrom J, Ocklind A, Hjelm F, Ventham NT, Ho GT, Petren C, Repsilber D, Söderholm J, Pierik M, D'Amato M, Gomollón F, Olbjorn C, Jahnsen J, Vatn MH, Halfvarson J, Satsangi J (2021)
Serum proteomic profiling at diagnosis predicts clinical course, and need for intensification of treatment in inflammatory bowel disease
J Crohns Colitis, 15 (5), 699-708
DOI 10.1093/ecco-jcc/jjaa230, PubMed 33201212

Syversen SW, Goll GL, Jørgensen KK, Sandanger Ø, Sexton J, Olsen IC, Gehin JE, Warren DJ, Brun MK, Klaasen RA, Karlsen LN, Noraberg G, Zettel C, Ljoså MKA, Haugen AJ, Njålla RJ, Bruun TJ, Seeberg KA, Michelsen B, Strand EK, Skorpe S, Blomgren IM, Bragnes YH, Dotterud CK, Thune T et al. (2021)
Effect of Therapeutic Drug Monitoring vs Standard Therapy During Infliximab Induction on Disease Remission in Patients With Chronic Immune-Mediated Inflammatory Diseases: A Randomized Clinical Trial
JAMA, 325 (17), 1744-1754
DOI 10.1001/jama.2021.4172, PubMed 33944876

Lindeman I, Zhou C, Eggesbø LM, Miao Z, Polak J, Lundin KEA, Jahnsen J, Qiao SW, Iversen R, Sollid LM (2021)
Longevity, clonal relationship, and transcriptional program of celiac disease-specific plasma cells
J Exp Med, 218 (2)
DOI 10.1084/jem.20200852, PubMed 33095260

Kalla R, Adams AT, Ventham NT, Kennedy NA, White R, Clarke C, Ivens A, Bergemalm D, Vatn S, Lopez-Jimena B, IBD Character Consortium, Ricanek P, Vatn MH, Söderholm JD, Gomollón F, Nowak JK, Jahnsen J, Halfvarson J, McTaggart S, Ho GT, Buck A, Satsangi J (2020)
Whole Blood Profiling of T-cell-Derived microRNA Allows the Development of Prognostic models in Inflammatory Bowel Disease
J Crohns Colitis, 14 (12), 1724-1733
DOI 10.1093/ecco-jcc/jjaa134, PubMed 32598439

Jørgensen KK, Goll GL, Sexton J, Bolstad N, Olsen IC, Asak Ø, Berset IP, Blomgren IM, Dvergsnes K, Florholmen J, Frigstad SO, Henriksen M, Hagfors J, Huppertz-Hauss G, Haavardsholm EA, Klaasen RA, Moum B, Noraberg G, Prestegård U, Rydning JH, Sagatun L, Seeberg KA, Torp R, Vold C, Warren DJ et al. (2020)
Efficacy and Safety of CT-P13 in Inflammatory Bowel Disease after Switching from Originator Infliximab: Exploratory Analyses from the NOR-SWITCH Main and Extension Trials
BioDrugs, 34 (5), 681-694
DOI 10.1007/s40259-020-00438-7, PubMed 32965617

Hewitt S, Kristinsson J, Aasheim ET, Blom-Høgestøl IK, Aaseth E, Jahnsen J, Eriksen EF, Mala T (2020)
Relationships Between Vitamin D Status and PTH over 5 Years After Roux-en-Y Gastric Bypass: a Longitudinal Cohort Study
Obes Surg, 30 (9), 3426-3434
DOI 10.1007/s11695-020-04582-5, PubMed 32306297

Vatn S, Carstens A, Kristoffersen AB, Bergemalm D, Casén C, Moen AEF, Tannaes TM, Lindstrøm J, Detlie TE, Olbjørn C, Lindquist CM, Söderholm JD, Gomollón F, Kalla R, Satsangi J, Vatn MH, Jahnsen J, Halfvarson J, Ricanek P, IBD-Character Consortium (2020)
Faecal microbiota signatures of IBD and their relation to diagnosis, disease phenotype, inflammation, treatment escalation and anti-TNF response in a European Multicentre Study (IBD-Character)
Scand J Gastroenterol, 55 (10), 1146-1156
DOI 10.1080/00365521.2020.1803396, PubMed 32780604

Klepp P, Brackmann S, Cvancarova M, Hoivik ML, Hovde Ø, Henriksen M, Huppertz-Hauss G, Bernklev T, Hoie O, Kempski-Monstad I, Solberg IC, Stray N, Jahnsen J, Vatn MH, Moum B (2020)
Risk of colorectal cancer in a population-based study 20 years after diagnosis of ulcerative colitis: results from the IBSEN study
BMJ Open Gastroenterol, 7 (1), e000361
DOI 10.1136/bmjgast-2019-000361, PubMed 32337058

Bjørlykke KH, Eftang LL, Grzyb K, Line PD, Lassen K, Jahnsen J (2020)
[Correction: A man in his fifties with abdominal pain, itching and weight loss]
Tidsskr Nor Laegeforen, 140 (4)
DOI 10.4045/tidsskr.20.0137, PubMed 32192268

Opheim R, Moum B, Grimstad BT, Jahnsen J, Prytz Berset I, Hovde Ø, Huppertz-Hauss G, Bernklev T, Jelsness-Jørgensen LP (2020)
Self-esteem in patients with inflammatory bowel disease
Qual Life Res, 29 (7), 1839-1846
DOI 10.1007/s11136-020-02467-9, PubMed 32144613

Bjorlykke KH, Eftang LL, Grzyb K, Line PD, Lassen K, Jahnsen J (2020)
A man in his 50s with abdominal pain, itching and weight loss
Tidsskr. Nor. Laegeforen., 140 (3), 268-272

Bjørlykke KH, Eftang LL, Grzyb K, Line PD, Lassen K, Jahnsen J (2020)
A man in his fifties with abdominal pain, itching and weight loss
Tidsskr Nor Laegeforen, 140 (3)
DOI 10.4045/tidsskr.19.0390, PubMed 32105028

Kim H, Alten R, Avedano L, Dignass A, Gomollón F, Greveson K, Halfvarson J, Irving PM, Jahnsen J, Lakatos PL, Lee J, Makri S, Parker B, Peyrin-Biroulet L, Schreiber S, Simoens S, Westhovens R, Danese S, Jeong JH (2020)
The Future of Biosimilars: Maximizing Benefits Across Immune-Mediated Inflammatory Diseases
Drugs, 80 (2), 99-113
DOI 10.1007/s40265-020-01256-5, PubMed 32002851

Syversen SW, Goll GL, Jørgensen KK, Olsen IC, Sandanger Ø, Gehin JE, Warren DJ, Sexton J, Mørk C, Jahnsen J, Kvien TK, Bolstad N, Haavardsholm EA (2020)
Therapeutic drug monitoring of infliximab compared to standard clinical treatment with infliximab: study protocol for a randomised, controlled, open, parallel-group, phase IV study (the NOR-DRUM study)
Trials, 21 (1), 13
DOI 10.1186/s13063-019-3734-4, PubMed 31907007

Ossum AM, Palm Ø, Cvancarova M, Bernklev T, Jahnsen J, Moum B, Høivik ML, IBSEN Study Group (2020)
The Impact of Spondyloarthritis and Joint Symptoms on Health-Related Quality of Life and Fatigue in IBD Patients. Results From a Population-Based Inception Cohort (20-Year Follow-up in the Ibsen Study)
Inflamm Bowel Dis, 26 (1), 114-124
DOI 10.1093/ibd/izz105, PubMed 31127829

Frigstad SO, Høivik ML, Jahnsen J, Cvancarova M, Grimstad T, Berset IP, Huppertz-Hauss G, Hovde Ø, Bernklev T, Moum B, Jelsness-Jørgensen LP (2019)
Pain Severity and Vitamin D Deficiency in IBD Patients
Nutrients, 12 (1)
DOI 10.3390/nu12010026, PubMed 31877637

Dahal-Koirala S, Neumann RS, Jahnsen J, Lundin KEA, Sollid LM (2019)
On the immune response to barley in celiac disease: Biased and public T-cell receptor usage to a barley unique and immunodominant gluten epitope
Eur J Immunol, 50 (2), 256-269
DOI 10.1002/eji.201948253, PubMed 31628754

Detlie TE, Lindstrøm JC, Jahnsen ME, Finnes E, Zoller H, Moum B, Jahnsen J (2019)
Incidence of hypophosphatemia in patients with inflammatory bowel disease treated with ferric carboxymaltose or iron isomaltoside
Aliment Pharmacol Ther, 50 (4), 397-406
DOI 10.1111/apt.15386, PubMed 31264261

Kristensen VA, Valeur J, Brackmann S, Jahnsen J, Brunborg C, Tveito K (2019)
Attention deficit and hyperactivity disorder symptoms respond to gluten-free diet in patients with coeliac disease
Scand J Gastroenterol, 54 (5), 571-576
DOI 10.1080/00365521.2019.1608467, PubMed 31050907

Lunder AK, Bakstad LT, Jahnsen J, Borthne A, Hov JR, Vatn M, Negård A (2019)
Assessment of Bowel Inflammation and Strictures by Magnetic Resonance Enterography in Long-term Crohn's Disease
J Crohns Colitis, 13 (5), 607-614
DOI 10.1093/ecco-jcc/jjy208, PubMed 30541145

Goll GL, Jørgensen KK, Sexton J, Olsen IC, Bolstad N, Haavardsholm EA, Lundin KEA, Tveit KS, Lorentzen M, Berset IP, Fevang BTS, Kalstad S, Ryggen K, Warren DJ, Klaasen RA, Asak Ø, Baigh S, Blomgren IM, Brenna Ø, Bruun TJ, Dvergsnes K, Frigstad SO, Hansen IM, Hatten ISH, Huppertz-Hauss G et al. (2019)
Long-term efficacy and safety of biosimilar infliximab (CT-P13) after switching from originator infliximab: open-label extension of the NOR-SWITCH trial
J Intern Med, 285 (6), 653-669
DOI 10.1111/joim.12880, PubMed 30762274

Olbjørn C, Cvancarova Småstuen M, Thiis-Evensen E, Nakstad B, Vatn MH, Jahnsen J, Ricanek P, Vatn S, Moen AEF, Tannæs TM, Lindstrøm JC, Söderholm JD, Halfvarson J, Gomollón F, Casén C, Karlsson MK, Kalla R, Adams AT, Satsangi J, Perminow G (2019)
Fecal microbiota profiles in treatment-naïve pediatric inflammatory bowel disease - associations with disease phenotype, treatment, and outcome
Clin Exp Gastroenterol, 12, 37-49
DOI 10.2147/CEG.S186235, PubMed 30774408

Høydahl LS, Richter L, Frick R, Snir O, Gunnarsen KS, Landsverk OJB, Iversen R, Jeliazkov JR, Gray JJ, Bergseng E, Foss S, Qiao SW, Lundin KEA, Jahnsen J, Jahnsen FL, Sandlie I, Sollid LM, Løset GÅ (2018)
Plasma Cells Are the Most Abundant Gluten Peptide MHC-expressing Cells in Inflamed Intestinal Tissues From Patients With Celiac Disease
Gastroenterology, 156 (5), 1428-1439.e10
DOI 10.1053/j.gastro.2018.12.013, PubMed 30593798

Chauhan A, Lalor T, Watson S, Adams D, Farrah TE, Anand A, Kimmitt R, Mills NL, Webb DJ, Dhaun N, Kalla R, Adams A, Vatn S, Bonfliglio F, Nimmo E, Kennedy N, Ventham N, Vatn M, Ricanek P, Halfvarson J, Soderhollm J, Pierik M, Torkvist L, Gomollon F, Gut I et al. (2018)
Scientific Business Abstracts of the 112th Annual Meeting of the Association of Physicians of Great Britain and Ireland
QJM, 111 (12), 920-924
DOI 10.1093/qjmed/hcy193, PubMed 31222346

Moen AEF, Lindstrøm JC, Tannæs TM, Vatn S, Ricanek P, Vatn MH, Jahnsen J, IBD-Character Consortium (2018)
The prevalence and transcriptional activity of the mucosal microbiota of ulcerative colitis patients
Sci Rep, 8 (1), 17278
DOI 10.1038/s41598-018-35243-4, PubMed 30467421

Kalla R, Boyapati R, Vatn S, Hijos G, Crooks B, Moore GT, Hall V, Lipscomb G, Gomollón F, Jahnsen J, Singh S (2018)
Patients' perceptions of faecal calprotectin testing in inflammatory bowel disease: results from a prospective multicentre patient-based survey
Scand J Gastroenterol, 53 (12), 1437-1442
DOI 10.1080/00365521.2018.1527394, PubMed 30451040

Frigstad SO, Høivik ML, Jahnsen J, Cvancarova M, Grimstad T, Berset IP, Huppertz-Hauss G, Hovde Ø, Bernklev T, Moum B, Jelsness-Jørgensen LP (2018)
Fatigue is not associated with vitamin D deficiency in inflammatory bowel disease patients
World J Gastroenterol, 24 (29), 3293-3301
DOI 10.3748/wjg.v24.i29.3293, PubMed 30090009

Hewitt S, Aasheim ET, Søvik TT, Jahnsen J, Kristinsson J, Eriksen EF, Mala T (2018)
Relationships of serum 25-hydroxyvitamin D, ionized calcium and parathyroid hormone after obesity surgery
Clin Endocrinol (Oxf), 88 (3), 372-379
DOI 10.1111/cen.13531, PubMed 29235126

Sunde ML, Ricanek P, Øresland T, Jahnsen J, Naimy N, Færden AE (2017)
Determinants of optimal bowel function in ileal pouch-anal anastomosis - physiological differences contributing to pouch function
Scand J Gastroenterol, 53 (1), 8-14
DOI 10.1080/00365521.2017.1390601, PubMed 29043868

Lunder AK, Jahnsen J, Bakstad LT, Borthne A, Hov JR, Vatn M, Negård A, IBSEN Study Group (2017)
Bowel Damage in Patients With Long-term Crohn's Disease, Assessed by Magnetic Resonance Enterography and the Lémann Index
Clin Gastroenterol Hepatol, 16 (1), 75-82.e5
DOI 10.1016/j.cgh.2017.06.053, PubMed 28694130

Reinisch W, Jahnsen J, Schreiber S, Danese S, Panés J, Balsa A, Park W, Kim J, Lee JU, Yoo DH (2017)
Evaluation of the Cross-reactivity of Antidrug Antibodies to CT-P13 and Infliximab Reference Product (Remicade): An Analysis Using Immunoassays Tagged with Both Agents
BioDrugs, 31 (3), 223-237
DOI 10.1007/s40259-017-0219-4, PubMed 28497221

Ráki M, Dahal-Koirala S, Yu H, Korponay-Szabó IR, Gyimesi J, Castillejo G, Jahnsen J, Qiao SW, Sollid LM (2017)
Similar Responses of Intestinal T Cells From Untreated Children and Adults With Celiac Disease to Deamidated Gluten Epitopes
Gastroenterology, 153 (3), 787-798.e4
DOI 10.1053/j.gastro.2017.05.016, PubMed 28535873

Jørgensen KK, Olsen IC, Goll GL, Lorentzen M, Bolstad N, Haavardsholm EA, Lundin KEA, Mørk C, Jahnsen J, Kvien TK, NOR-SWITCH study group (2017)
Switching from originator infliximab to biosimilar CT-P13 compared with maintained treatment with originator infliximab (NOR-SWITCH): a 52-week, randomised, double-blind, non-inferiority trial
Lancet, 389 (10086), 2304-2316
DOI 10.1016/S0140-6736(17)30068-5, PubMed 28502609

Jahnsen J, Kaasen Jørgensen K (2017)
Experience with Biosimilar Infliximab (Remsima®) in Norway
Dig Dis, 35 (1-2), 83-90
DOI 10.1159/000449088, PubMed 28147374

Huppertz-Hauss G, Høivik ML, Jelsness-Jørgensen LP, Opheim R, Henriksen M, Høie O, Hovde Ø, Kempski-Monstad I, Solberg IC, Jahnsen J, Hoff G, Moum B, Bernklev T (2016)
Fatigue in a population-based cohort of patients with inflammatory bowel disease 20 years after diagnosis: The IBSEN study
Scand J Gastroenterol, 52 (3), 351-358
DOI 10.1080/00365521.2016.1256425, PubMed 27852169

Jelsness-Jørgensen LP, Frigstad SO, Moum B, Grimstad T, Opheim R, Jahnsen J, Bernklev T (2016)
Pain may be an important factor to consider in inflammatory bowel disease patients troubled by fatigue
United European Gastroenterol J, 5 (5), 687-693
DOI 10.1177/2050640616674654, PubMed 28815032

Frigstad SO, Høivik M, Jahnsen J, Dahl SR, Cvancarova M, Grimstad T, Berset IP, Huppertz-Hauss G, Hovde Ø, Torp R, Bernklev T, Moum B, Jelsness-Jørgensen LP (2016)
Vitamin D deficiency in inflammatory bowel disease: prevalence and predictors in a Norwegian outpatient population
Scand J Gastroenterol, 52 (1), 100-106
DOI 10.1080/00365521.2016.1233577, PubMed 27603182

Huppertz-Hauss G, Lie Høivik M, Jelsness-Jørgensen LP, Henriksen M, Høie O, Jahnsen J, Hoff G, Moum B, Bernklev T (2016)
Health-related Quality of Life in Patients with Inflammatory Bowel Disease 20 Years After Diagnosis: Results from the IBSEN Study
Inflamm Bowel Dis, 22 (7), 1679-87
DOI 10.1097/MIB.0000000000000806, PubMed 27206016

Moen AE, Tannæs TM, Vatn S, Ricanek P, Vatn MH, Jahnsen J, IBD-Character Consortium (2016)
Simultaneous purification of DNA and RNA from microbiota in a single colonic mucosal biopsy
BMC Res Notes, 9, 328
DOI 10.1186/s13104-016-2110-7, PubMed 27352784

Lunder AK, Hov JR, Borthne A, Gleditsch J, Johannesen G, Tveit K, Viktil E, Henriksen M, Hovde Ø, Huppertz-Hauss G, Høie O, Høivik ML, Monstad I, Solberg IC, Jahnsen J, Karlsen TH, Moum B, Vatn M, Negård A (2016)
Prevalence of Sclerosing Cholangitis Detected by Magnetic Resonance Cholangiography in Patients With Long-term Inflammatory Bowel Disease
Gastroenterology, 151 (4), 660-669.e4
DOI 10.1053/j.gastro.2016.06.021, PubMed 27342213

Jelsness-Jørgensen LP, Moum B, Grimstad T, Jahnsen J, Opheim R, Prytz Berset I, Hovde Ø, Torp R, Frigstad SO, Huppertz-Hauss G, Bernklev T (2016)
Validity, Reliability, and Responsiveness of the Brief Pain Inventory in Inflammatory Bowel Disease
Can J Gastroenterol Hepatol, 2016, 5624261
DOI 10.1155/2016/5624261, PubMed 27446848

Hovde Ø, Småstuen MC, Høivik ML, Bernklev T, Huppertz-Hauss G, Høie O, Jahnsen J, Stray N, Henriksen M, Solberg IC, Moum BA (2016)
Mortality and Causes of Death in Ulcerative Colitis: Results from 20 Years of Follow-up in the IBSEN Study
Inflamm Bowel Dis, 22 (1), 141-5
DOI 10.1097/MIB.0000000000000582, PubMed 26355464

Jahnsen J, Detlie TE, Vatn S, Ricanek P (2015)
Biosimilar infliximab (CT-P13) in the treatment of inflammatory bowel disease: A Norwegian observational study
Expert Rev Gastroenterol Hepatol, 9 Suppl 1, 45-52
DOI 10.1586/17474124.2015.1091308, PubMed 26395534

Christophersen A, Ráki M, Bergseng E, Lundin KE, Jahnsen J, Sollid LM, Qiao SW (2014)
Tetramer-visualized gluten-specific CD4+ T cells in blood as a potential diagnostic marker for coeliac disease without oral gluten challenge
United European Gastroenterol J, 2 (4), 268-78
DOI 10.1177/2050640614540154, PubMed 25083284

Danilova E, Skrindo I, Gran E, Hales BJ, Smith WA, Jahnsen J, Johansen FE, Jahnsen FL, Baekkevold ES (2014)
A role for CCL28-CCR3 in T-cell homing to the human upper airway mucosa
Mucosal Immunol, 8 (1), 107-14
DOI 10.1038/mi.2014.46, PubMed 24917456

Steinsbø Ø, Henry Dunand CJ, Huang M, Mesin L, Salgado-Ferrer M, Lundin KE, Jahnsen J, Wilson PC, Sollid LM (2014)
Restricted VH/VL usage and limited mutations in gluten-specific IgA of coeliac disease lesion plasma cells
Nat Commun, 5, 4041
DOI 10.1038/ncomms5041, PubMed 24909383

De Vos M, Louis EJ, Jahnsen J, Vandervoort JG, Noman M, Dewit O, Dʼhaens GR, Franchimont D, Baert FJ, Torp RA, Henriksen M, Potvin PM, Van Hootegem PP, Hindryckx PM, Moreels TG, Collard A, Karlsen LN, Kittang E, Lambrecht G, Grimstad T, Koch J, Lygren I, Coche JC, Mana F, Van Gossum A et al. (2013)
Consecutive fecal calprotectin measurements to predict relapse in patients with ulcerative colitis receiving infliximab maintenance therapy
Inflamm Bowel Dis, 19 (10), 2111-7
DOI 10.1097/MIB.0b013e31829b2a37, PubMed 23883959

Bodd M, Ráki M, Bergseng E, Jahnsen J, Lundin KE, Sollid LM (2013)
Direct cloning and tetramer staining to measure the frequency of intestinal gluten-reactive T cells in celiac disease
Eur J Immunol, 43 (10), 2605-12
DOI 10.1002/eji.201343382, PubMed 23775608

Hovde Ø, Kempski-Monstad I, Småstuen MC, Solberg IC, Henriksen M, Jahnsen J, Stray N, Moum BA (2013)
Mortality and causes of death in Crohn's disease: results from 20 years of follow-up in the IBSEN study
Gut, 63 (5), 771-5
DOI 10.1136/gutjnl-2013-304766, PubMed 23744613

Hewitt S, Søvik TT, Aasheim ET, Kristinsson J, Jahnsen J, Birketvedt GS, Bøhmer T, Eriksen EF, Mala T (2013)
Secondary hyperparathyroidism, vitamin D sufficiency, and serum calcium 5 years after gastric bypass and duodenal switch
Obes Surg, 23 (3), 384-90
DOI 10.1007/s11695-012-0772-3, PubMed 23015268

Ráki M, Beitnes AC, Lundin KE, Jahnsen J, Jahnsen FL, Sollid LM (2013)
Plasmacytoid dendritic cells are scarcely represented in the human gut mucosa and are not recruited to the celiac lesion
Mucosal Immunol, 6 (5), 985-92
DOI 10.1038/mi.2012.136, PubMed 23340820

Høivik ML, Bernklev T, Solberg IC, Cvancarova M, Lygren I, Jahnsen J, Moum B, IBSEN Study Group (2011)
Patients with Crohn's disease experience reduced general health and vitality in the chronic stage: ten-year results from the IBSEN study
J Crohns Colitis, 6 (4), 441-53
DOI 10.1016/j.crohns.2011.10.001, PubMed 22398064

Beitnes AC, Ráki M, Lundin KE, Jahnsen J, Sollid LM, Jahnsen FL (2011)
Density of CD163+ CD11c+ dendritic cells increases and CD103+ dendritic cells decreases in the coeliac lesion
Scand J Immunol, 74 (2), 186-94
DOI 10.1111/j.1365-3083.2011.02549.x, PubMed 21392045

Boye B, Lundin KE, Jantschek G, Leganger S, Mokleby K, Tangen T, Jantschek I, Pripp AH, Wojniusz S, Dahlstroem A, Rivenes AC, Benninghoven D, Hausken T, Roseth A, Kunzendorf S, Wilhelmsen I, Sharpe M, Blomhoff S, Malt UF, Jahnsen J (2011)
INSPIRE study: does stress management improve the course of inflammatory bowel disease and disease-specific quality of life in distressed patients with ulcerative colitis or Crohn's disease? A randomized controlled trial
Inflamm Bowel Dis, 17 (9), 1863-73
DOI 10.1002/ibd.21575, PubMed 21287660

Bengtson MB, Solberg IC, Aamodt G, Jahnsen J, Moum B, Vatn MH, IBSEN Study Group (2010)
Relationships between inflammatory bowel disease and perinatal factors: both maternal and paternal disease are related to preterm birth of offspring
Inflamm Bowel Dis, 16 (5), 847-55
DOI 10.1002/ibd.21120, PubMed 19795509

Moum B, Jahnsen J (2010)
[Obesity surgery in inflammatory bowel disease]
Tidsskr Nor Laegeforen, 130 (6), 638-9
DOI 10.4045/tidsskr.09.1281, PubMed 20349013

Bengtson MB, Solberg C, Aamodt G, Jahnsen J, Moum B, Sauar J, Vatn MH, Ibsen Study Group (2009)
Clustering in time of familial IBD separates ulcerative colitis from Crohn's disease
Inflamm Bowel Dis, 15 (12), 1867-74
DOI 10.1002/ibd.20978, PubMed 19434721

Solberg IC, Lygren I, Cvancarova M, Jahnsen J, Stray N, Sauar J, Schreiber S, Moum B, Vatn MH, IBSEN Study Group (2009)
Predictive value of serologic markers in a population-based Norwegian cohort with inflammatory bowel disease
Inflamm Bowel Dis, 15 (3), 406-14
DOI 10.1002/ibd.20781, PubMed 19009607

Solberg IC, Lygren I, Jahnsen J, Aadland E, Høie O, Cvancarova M, Bernklev T, Henriksen M, Sauar J, Vatn MH, Moum B, IBSEN Study Group (2009)
Clinical course during the first 10 years of ulcerative colitis: results from a population-based inception cohort (IBSEN Study)
Scand J Gastroenterol, 44 (4), 431-40
DOI 10.1080/00365520802600961, PubMed 19101844

Bengtson MB, Solberg C, Aamodt G, Sauar J, Jahnsen J, Moum B, Lygren I, Vatn MH, IBSEN study group (2008)
Familial aggregation in Crohn's disease and ulcerative colitis in a Norwegian population-based cohort followed for ten years
J Crohns Colitis, 3 (2), 92-9
DOI 10.1016/j.crohns.2008.11.002, PubMed 21172251

Aamodt G, Bukholm G, Jahnsen J, Moum B, Vatn MH, IBSEN Study Group (2008)
The association between water supply and inflammatory bowel disease based on a 1990-1993 cohort study in southeastern Norway
Am J Epidemiol, 168 (9), 1065-72
DOI 10.1093/aje/kwn218, PubMed 18801890

Aamodt G, Jahnsen J, Bengtson MB, Moum B, Vatn MH, IBSEN Study Group (2008)
Geographic distribution and ecological studies of inflammatory bowel disease in southeastern Norway in 1990-1993
Inflamm Bowel Dis, 14 (7), 984-91
DOI 10.1002/ibd.20417, PubMed 18338775

Henriksen M, Jahnsen J, Lygren I, Stray N, Sauar J, Vatn MH, Moum B, IBSEN Study Group (2008)
C-reactive protein: a predictive factor and marker of inflammation in inflammatory bowel disease. Results from a prospective population-based study
Gut, 57 (11), 1518-23
DOI 10.1136/gut.2007.146357, PubMed 18566104

Boye B, Jahnsen J, Mokleby K, Leganger S, Jantschek G, Jantschek I, Kunzendorf S, Benninghoven D, Wilhelmsen I, Sharpe M, Blomhoff S, Malt UF, Lundin KE (2008)
The INSPIRE study: are different personality traits related to disease-specific quality of life (IBDQ) in distressed patients with ulcerative colitis and Crohn's disease?
Inflamm Bowel Dis, 14 (5), 680-6
DOI 10.1002/ibd.20367, PubMed 18509900

Boye B, Lundin KE, Leganger S, Mokleby K, Jantschek G, Jantschek I, Kunzendorf S, Benninghoven D, Sharpe M, Wilhelmsen I, Blomhoff S, Malt UF, Jahnsen J (2008)
The INSPIRE study: do personality traits predict general quality of life (Short form-36) in distressed patients with ulcerative colitis and Crohn's disease?
Scand J Gastroenterol, 43 (12), 1505-13
DOI 10.1080/00365520802321196, PubMed 18777439

Solberg IC, Vatn MH, Høie O, Stray N, Sauar J, Jahnsen J, Moum B, Lygren I, IBSEN Study Group (2007)
Clinical course in Crohn's disease: results of a Norwegian population-based ten-year follow-up study
Clin Gastroenterol Hepatol, 5 (12), 1430-8
DOI 10.1016/j.cgh.2007.09.002, PubMed 18054751

Henriksen M, Jahnsen J, Lygren I, Vatn MH, Moum B, IBSEN Study Group (2007)
Are there any differences in phenotype or disease course between familial and sporadic cases of inflammatory bowel disease? Results of a population-based follow-up study
Am J Gastroenterol, 102 (9), 1955-63
DOI 10.1111/j.1572-0241.2007.01368.x, PubMed 17573793

Frøslie KF, Jahnsen J, Moum BA, Vatn MH, IBSEN Group (2007)
Mucosal healing in inflammatory bowel disease: results from a Norwegian population-based cohort
Gastroenterology, 133 (2), 412-22
DOI 10.1053/j.gastro.2007.05.051, PubMed 17681162

Henriksen M, Jahnsen J, Lygren I, Aadland E, Schulz T, Vatn MH, Moum B, Ibsen Study Group (2007)
Clinical course in Crohn's disease: results of a five-year population-based follow-up study (the IBSEN study)
Scand J Gastroenterol, 42 (5), 602-10
DOI 10.1080/00365520601076124, PubMed 17454881

Olaussen RW, Karlsson MR, Lundin KE, Jahnsen J, Brandtzaeg P, Farstad IN (2007)
Reduced chemokine receptor 9 on intraepithelial lymphocytes in celiac disease suggests persistent epithelial activation
Gastroenterology, 132 (7), 2371-82
DOI 10.1053/j.gastro.2007.04.023, PubMed 17570212

Henriksen M, Jahnsen J, Lygren I, Sauar J, Schulz T, Stray N, Vatn MH, Moum B, Ibsen Study Group (2006)
Change of diagnosis during the first five years after onset of inflammatory bowel disease: results of a prospective follow-up study (the IBSEN Study)
Scand J Gastroenterol, 41 (9), 1037-43
DOI 10.1080/00365520600554527, PubMed 16938716

Henriksen M, Jahnsen J, Lygren I, Sauar J, Kjellevold Ø, Schulz T, Vatn MH, Moum B, IBSEN Study Group (2006)
Ulcerative colitis and clinical course: results of a 5-year population-based follow-up study (the IBSEN study)
Inflamm Bowel Dis, 12 (7), 543-50
DOI 10.1097/01.MIB.0000225339.91484.fc, PubMed 16804390

Bernklev T, Jahnsen J, Henriksen M, Lygren I, Aadland E, Sauar J, Schulz T, Stray N, Vatn M, Moum B (2006)
Relationship between sick leave, unemployment, disability, and health-related quality of life in patients with inflammatory bowel disease
Inflamm Bowel Dis, 12 (5), 402-12
DOI 10.1097/01.MIB.0000218762.61217.4a, PubMed 16670530

Deressa E, Wammer AC, Falch JA, Jahnsen J (2006)
[Bone metabolism in patients with newly diagnosed caeliac disease]
Tidsskr Nor Laegeforen, 126 (9), 1201-4
PubMed 16670741

Medici V, Mascheretti S, Croucher PJ, Stoll M, Hampe J, Grebe J, Sturniolo GC, Solberg C, Jahnsen J, Moum B, Schreiber S, Vatn MH (2006)
Extreme heterogeneity in CARD15 and DLG5 Crohn disease-associated polymorphisms between German and Norwegian populations
Eur J Hum Genet, 14 (4), 459-68
DOI 10.1038/sj.ejhg.5201576, PubMed 16493449

Bernklev T, Jahnsen J, Lygren I, Henriksen M, Vatn M, Moum B (2005)
Health-related quality of life in patients with inflammatory bowel disease measured with the short form-36: psychometric assessments and a comparison with general population norms
Inflamm Bowel Dis, 11 (10), 909-18
DOI 10.1097/01.mib.0000179467.01748.99, PubMed 16189421

Bernklev T, Jahnsen J, Schulz T, Sauar J, Lygren I, Henriksen M, Stray N, Kjellevold Ø, Aadland E, Vatn M, Moum B (2005)
Course of disease, drug treatment and health-related quality of life in patients with inflammatory bowel disease 5 years after initial diagnosis
Eur J Gastroenterol Hepatol, 17 (10), 1037-45
DOI 10.1097/00042737-200510000-00006, PubMed 16148548

Winter TA, Wright J, Ghosh S, Jahnsen J, Innes A, Round P (2004)
Intravenous CDP870, a PEGylated Fab' fragment of a humanized antitumour necrosis factor antibody, in patients with moderate-to-severe Crohn's disease: an exploratory study
Aliment Pharmacol Ther, 20 (11-12), 1337-46
DOI 10.1111/j.1365-2036.2004.02285.x, PubMed 15606396

Bell H, Jahnsen J, Kittang E, Raknerud N, Sandvik L (2004)
Long-term prognosis of patients with alcoholic liver cirrhosis: a 15-year follow-up study of 100 Norwegian patients admitted to one unit
Scand J Gastroenterol, 39 (9), 858-63
DOI 10.1080/00365520410006350, PubMed 15513384

Bernklev T, Jahnsen J, Aadland E, Sauar J, Schulz T, Lygren I, Henriksen M, Stray N, Kjellevold O, Vatn M, Moum B, IBSEN Study Group (2004)
Health-related quality of life in patients with inflammatory bowel disease five years after the initial diagnosis
Scand J Gastroenterol, 39 (4), 365-73
DOI 10.1080/00365520310008386, PubMed 15125469

Jahnsen J, Falch JA, Mowinckel P, Aadland E (2004)
Bone mineral density in patients with inflammatory bowel disease: a population-based prospective two-year follow-up study
Scand J Gastroenterol, 39 (2), 145-53
DOI 10.1080/00365520310007873, PubMed 15000276

Størdal K, Jahnsen J, Bentsen BS, Moum B (2004)
Pediatric inflammatory bowel disease in southeastern Norway: a five-year follow-up study
Digestion, 70 (4), 226-30
DOI 10.1159/000082893, PubMed 15627770

Jahnsen J, Falch JA, Mowinckel P, Aadland E (2003)
Body composition in patients with inflammatory bowel disease: a population-based study
Am J Gastroenterol, 98 (7), 1556-62
DOI 10.1111/j.1572-0241.2003.07520.x, PubMed 12873577

Olaussen RW, Johansen FE, Lundin KE, Jahnsen J, Brandtzaeg P, Farstad IN (2002)
Interferon-gamma-secreting T cells localize to the epithelium in coeliac disease
Scand J Immunol, 56 (6), 652-64
DOI 10.1046/j.1365-3083.2002.01195.x, PubMed 12472679

Farstad IN, Johansen FE, Vlatkovic L, Jahnsen J, Scott H, Fausa O, Bjørneklett A, Brandtzaeg P, Halstensen TS (2002)
Heterogeneity of intraepithelial lymphocytes in refractory sprue: potential implications of CD30 expression
Gut, 51 (3), 372-8
DOI 10.1136/gut.51.3.372, PubMed 12171959

Hampe J, Grebe J, Nikolaus S, Solberg C, Croucher PJ, Mascheretti S, Jahnsen J, Moum B, Klump B, Krawczak M, Mirza MM, Foelsch UR, Vatn M, Schreiber S (2002)
Association of NOD2 (CARD 15) genotype with clinical course of Crohn's disease: a cohort study
Lancet, 359 (9318), 1661-5
DOI 10.1016/S0140-6736(02)08590-2, PubMed 12020527

Jahnsen J, Falch JA, Mowinckel P, Aadland E (2002)
Vitamin D status, parathyroid hormone and bone mineral density in patients with inflammatory bowel disease
Scand J Gastroenterol, 37 (2), 192-9
DOI 10.1080/003655202753416876, PubMed 11843057

Palm Ø, Moum B, Jahnsen J, Gran JT (2001)
The prevalence and incidence of peripheral arthritis in patients with inflammatory bowel disease, a prospective population-based study (the IBSEN study)
Rheumatology (Oxford), 40 (11), 1256-61
DOI 10.1093/rheumatology/40.11.1256, PubMed 11709609

Palm O, Moum B, Jahnsen J, Gran JT (2001)
Fibromyalgia and chronic widespread pain in patients with inflammatory bowel disease: a cross sectional population survey
J Rheumatol, 28 (3), 590-4
PubMed 11296964

Wurzer H, Bardhan KD, Marcelino M, Jahnsen J, Allmaier M (2001)
Duodenal ulcer healing rates in a one-year follow-up study with ranitidine bismuth citrate and antibiotics
Hepatogastroenterology, 48 (42), 1641-7
PubMed 11813591

Haukeland JW, Jahnsen J, Raknerud N (2000)
[Carbamazepine-induced hepatitis]
Tidsskr Nor Laegeforen, 120 (24), 2875-7
PubMed 11143408

Jahnsen J, Falch JA, Mowinckel P, Aadland E (1999)
Ultrasound measurements of calcaneus for estimation of skeletal status in patients with inflammatory bowel disease
Scand J Gastroenterol, 34 (8), 790-7
DOI 10.1080/003655299750025723, PubMed 10499480

Nilsen EM, Jahnsen FL, Lundin KE, Johansen FE, Fausa O, Sollid LM, Jahnsen J, Scott H, Brandtzaeg P (1998)
Gluten induces an intestinal cytokine response strongly dominated by interferon gamma in patients with celiac disease
Gastroenterology, 115 (3), 551-63
DOI 10.1016/s0016-5085(98)70134-9, PubMed 9721152

Bardhan KD, Wurzer H, Marcelino M, Jahnsen J, Lotay N, Roberts PM (1998)
Ranitidine bismuth citrate with clarithromycin given twice daily effectively eradicates Helicobacter pylori and heals duodenal ulcers
Am J Gastroenterol, 93 (3), 380-5
DOI 10.1111/j.1572-0241.1998.00380.x, PubMed 9517644

Boberg KM, Aadland E, Jahnsen J, Raknerud N, Stiris M, Bell H (1998)
Incidence and prevalence of primary biliary cirrhosis, primary sclerosing cholangitis, and autoimmune hepatitis in a Norwegian population
Scand J Gastroenterol, 33 (1), 99-103
DOI 10.1080/00365529850166284, PubMed 9489916

Jahnsen J, Falch JA, Aadland E, Mowinckel P (1997)
Bone mineral density is reduced in patients with Crohn's disease but not in patients with ulcerative colitis: a population based study
Gut, 40 (3), 313-9
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Røseth AG, Aadland E, Jahnsen J, Raknerud N (1997)
Assessment of disease activity in ulcerative colitis by faecal calprotectin, a novel granulocyte marker protein
Digestion, 58 (2), 176-80
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JAHNSEN J, VATN MH (1991)
2 CASES OF VITAMIN-D DEFICIENCY AND OSTEOMALACIA AFTER ABDOMINAL IRRADIATION
Eur. J. Gastroenterol. Hepatol., 3 (1), 97-98

Jørgensen JJ, Lunde OC, Enge I, Jahnsen J, Lundbom J (1990)
[Chronic intestinal ischemia]
Tidsskr Nor Laegeforen, 110 (11), 1331-4
PubMed 2339376

Jahnsen J, Vatn MH (1989)
[Radiation injury of the intestine]
Tidsskr Nor Laegeforen, 109 (25), 2557-8
PubMed 2814976

Review articles

Reinisch W, Gecse K, Halfvarson J, Irving PM, Jahnsen J, Peyrin-Biroulet L, Rogler G, Schreiber S, Danese S (2021)
Clinical Practice of Adalimumab and Infliximab Biosimilar Treatment in Adult Patients With Crohn's Disease
Inflamm Bowel Dis, 27 (1), 106-122
DOI 10.1093/ibd/izaa078, PubMed 32634212

Romstad KK, Detlie TE, Søberg T, Ricanek P, Jahnsen ME, Lerang F, Jahnsen J (2020)
Gastrointestinal bleeding due to peptic ulcers and erosions - a prospective observational study (BLUE study)
Scand J Gastroenterol, 55 (10), 1139-1145
DOI 10.1080/00365521.2020.1819405, PubMed 32931710

Olbjørn C, Rove JB, Jahnsen J (2020)
Combination of Biological Agents in Moderate to Severe Pediatric Inflammatory Bowel Disease: A Case Series and Review of the Literature
Paediatr Drugs, 22 (4), 409-416
DOI 10.1007/s40272-020-00396-1, PubMed 32378002

Jahnsen J (2016)
Clinical experience with infliximab biosimilar Remsima (CT-P13) in inflammatory bowel disease patients
Therap Adv Gastroenterol, 9 (3), 322-9
DOI 10.1177/1756283X16636764, PubMed 27134662

Jahnsen J, Røseth AG, Aadland E (2009)
[Measurement of calprotectin in faeces]
Tidsskr Nor Laegeforen, 129 (8), 743-5
DOI 10.4045/tidsskr.08.0010, PubMed 19373299

Other articles

Das S, Stamnaes J, Kemppainen E, Hervonen K, Lundin KEA, Parmar N, Jahnsen FL, Jahnsen J, Lindfors K, Salmi T, Iversen R, Sollid LM (2024)
Correction to: Separate Gut Plasma Cell Populations Produce Auto-Antibodies against Transglutaminase 2 and Transglutaminase 3 in Dermatitis Herpetiformis
Adv Sci (Weinh), e2400894 (in press)
DOI 10.1002/advs.202400894, PubMed 38477397

Christophersen A, Zühlke S, Lund EG, Snir O, Dahal-Koirala S, Risnes LF, Jahnsen J, Lundin KEA, Sollid LM (2022)
Pathogenic T Cells in Celiac Disease Change Phenotype on Gluten Challenge: Implications for T-Cell-Directed Therapies
Adv Sci (Weinh), 9 (34), e2205912
DOI 10.1002/advs.202205912, PubMed 36482157

Syversen SW, Jahnsen J, Haavardsholm EA (2022)
Therapeutic Drug Monitoring vs Standard Therapy During Maintenance Infliximab Therapy and Control of Immune-Mediated Inflammatory Diseases-Reply
JAMA, 327 (15), 1506-1507
DOI 10.1001/jama.2022.2938, PubMed 35438729

Detlie TE, Jahnsen J (2020)
Editorial: improving precision of iron deficiency diagnosis in inflammatory bowel disease
Aliment Pharmacol Ther, 52 (2), 400
DOI 10.1111/apt.15809, PubMed 32592260

Kim H, Alten R, Avedano L, Dignass A, Gomollón F, Greveson K, Halfvarson J, Irving PM, Jahnsen J, Lakatos PL, Lee J, Makri S, Parker B, Peyrin-Biroulet L, Schreiber S, Simoens S, Westhovens R, Danese S, Jeong JH (2020)
Correction to: The Future of Biosimilars: Maximizing Benefits Across Immune-Mediated Inflammatory Diseases
Drugs, 80 (10), 1039-1040
DOI 10.1007/s40265-020-01333-9, PubMed 32488813

Detlie TE, Jahnsen J (2019)
Editorial: awareness and prevention of intravenous iron-induced hypophosphataemia. Authors' reply
Aliment Pharmacol Ther, 50 (5), 610-611
DOI 10.1111/apt.15443, PubMed 31414537

Jørgensen KK, Lundin KE, Olsen IC, Kvien TK, Jahnsen J (2017)
Efficacy of infliximab biosimilars in patients with Crohn's disease - Authors' reply
Lancet, 390 (10111), 2436
DOI 10.1016/S0140-6736(17)32463-7, PubMed 29208304

Moum B, Jahnsen J, Bernklev T (2010)
Fecal calprotectin variability in Crohn's disease
Inflamm Bowel Dis, 16 (7), 1091-2
DOI 10.1002/ibd.21136, PubMed 19834972

Moum B, Konopski Z, Tufteland KF, Jahnsen J (2007)
Occurrence of hepatoxicicty and elevated liver enzymes in a Crohn's disease patient treated with infliximab
Inflamm Bowel Dis, 13 (12), 1584-6
DOI 10.1002/ibd.20230, PubMed 17663423

Jahnsen J, Falch JA, Aadland E (1997)
Bone mineral density in Crohn's disease - Reply
Gut, 41 (4), 579

Book chapters

Jahnsen J, Falch JA, Mowinckel P, Aadland E (2004)
Bone mineral density in patients with inflammatory bowel disease: a population-based prospective two-year follow-up study
In Scandinavian journal of gastroenterology, Taylor & Francis, Basingstoke, 39(2004)2, S. 145-53
BIBSYS 051784025

Størdal K, Jahnsen J, Bentsen BS, Moum B (2004)
Pediatric inflammatory bowel disease in southeastern Norway: a five year follow-up study
In Digestion, Karger, Basel, 70(2004)4, S. 226-30
BIBSYS 051855887

Bell H, Jahnsen J, Kittang E, Raknerud N, Sandvik L (2004)
Long-term prognosis of patients with alcoholic liver cirrhosis: a 15 - year follow-up study of 100 Norwegian patients admitted to one unit
In Scandinavian journal of gastroenterology, Taylor & Francis, Basingstoke, 39(2004)9, s.858-63
BIBSYS 051773260

Winter TA, Wright J, Ghosh S, Jahnsen J, Innes A, Round P (2004)
Intravenous CDP870, a PEGylated Fab' fragment of a humanized antitumour necrosis factor antibody in patients with moderate-to-servere Chron's disease: an exploratory study
In Alimentary pharmacology and therapeutics, Blackwell, Oxford, 20(2004)11/12, S.1337-46
BIBSYS 052022315

Bernklev T, Jahnsen J, Aadland E, Sauar J, Schulz T, Lygren I, Henriksen M, Stray N, Kjellevold O, Vatn MH, Moum B (2004)
Health-related quality of life in patients with inflammatory bowel disease five years after the inital diagnosis
In Scandinavian journal of gastroenterology, Taylor & Francis, Basingstoke, 39(2004)4, s. 365-73
BIBSYS 051773643

Winter T, Wright J, Ghosh S, Jahnsen J, Patel J (2003)
Intravenous CDP870, a humanized anti-TNF antibody fragment, in patients with active Crohn's disease: an exploratory study
In Gastroenterology, Gastroenterology, Baltimore, Md., 124(2003)suppl 1, s.A377 abstract M1579
BIBSYS 041735897

Henriksen M, Jahnsen J, Bernklev T (2003)
Clinical course and prognostic factors in IBD 5 years after diagnosis
In Gut, British Medical Association, London, 52(2003)suppl 6, s.A3
BIBSYS 041733630

Bernklev T, Moum B, Jahnsen J, Vatn MH (2003)
Variables influencing health related quality of life (HRQOL) in patients with inflammatory bowel disease (IBD)
In Gastroenterology, Gastroenterology, Baltimore, Md., 124(2003)suppl 1, s.A218 abstrakt S1439
BIBSYS 041729781

Moum B, Jahnsen J, Vatn MH, Bernklev T (2003)
Familial occurence og IBD in Ulcerative colitis and Crohn's disease patients and the significance of this for disease behaviour
In Gastroenterology, Gastroenterology, Baltimore, Md., 124(2003)suppl 1, s.A210 abstract S1400
BIBSYS 041734653

Bernklev T, Henriksen M, Jahnsen J, Lygren I, Sauar J, Stary N, Kjellevold O, Aadland E, Vatn MH, Moum B (2003)
Health related quality of life five years after diagnosisin a prospective follow up study of patients with inflammatory bowel disease
In Gut, British Medical Association, London, 52(2003)suppl 6, s.A40
BIBSYS 041729900

Jahnsen J, Falch JA, Mowinckel P, Aadland E (2003)
Body composition in patients with inflammatory bowel disease: a population based study
In American journal of gastroenterology, Elsevier, New York, 98(2003)nr 7, s.1556-62
BIBSYS 041718178

Moum B, Henriksen M, Jahnsen J (2003)
Familial occurence of IBD
In Gut, British Medical Association, London, 52(2003)suppl 6, s.A79
BIBSYS 04173467x

Bernklev T, Jahnsen J, Henriksen M, Sauar J, Lygren I, Aadland E (2003)
Is a more severe course of inflammatory bowel disease reflected in the patients' health related quality of life 5 years after diagnosis in a prospective follow up study?
In Gut, British Medical Association, London, 52(2003)suppl 6, s.A207
BIBSYS 041731417

Bernklev T, Moum B, Jahnsen J, Vatn MH (2003)
Variables influencing health related quality of life in patients with inflammatory bowel disease
In Gastroenterology, Gastroenterology, Baltimore, Md., 124(2003)suppl 1, s.A20 abstrakt S1399
BIBSYS 041729730

Bell H, Jahnsen J, Kittang E, Raknerud N, Sandvik L (2002)
Long term prognosis of patients with alcoholic liver cirrhosis: results from a 15 year follow-up study of 100 Norwegian patients
In Journal of hepatology, Munksgaard, København, 36(2002) Suppl 1, s. 22
BIBSYS 03142614x

Hampe J, Grebe J, Nikolaus S, Solberg C, Croucher PJ, Mascheretti S, Jahnsen J, Moum B, Klump M, Krawczak M, Mirza MM, Foelsch UR, Vatn MH, Schreiber S (2002)
Association of NOD2 (CARD 15) genotype with clinical course of Crohn's disease: a cohort study
In Lancet, Lancet Ltd., London, 359(2002)nr 9318, s. 1661-1665
BIBSYS 031255922

Jahnsen J, Falch JA, Mowinckel P, Aadland E (2002)
Vitamin D status, parathyroid hormone and bone mineral density in patients with inflammatory bowel disease
In Scandinavian journal of gastroenterology, Taylor & Francis, Basingstoke, 37(2002)nr 2, s. 192-199
BIBSYS 031256333

Olaussen RW, Johansen FE, Lundin K, Jahnsen J, Brandtzæg P, Farstad IN (2002)
Interferon-gamma-secreting T cells localize to the epithelium in coeliac disease
In Scandinavian journal of immunology, Blackwell Scientific Publications, Oxford, 56(2002)nr 6, s. 652-664
BIBSYS 031256589

Farstad IN, Johansen FE, Vlatkovic L, Jahnsen J, Scott H, Fausa O, Bjørneklett A, Brandtzæg P, Halstensen TS (2002)
Heterogeneity of intraepithelial lymphocytes in refractory sprue: potential implications of CD30 expression
In Gut, British Medical Association, London, 51(2002)nr 3, s. 372-378
BIBSYS 031255752

Haukeland JW, Jahnsen J, Raknerud N (2000)
Karbamazepinindusert hepatitt
In Tidsskrift for Den norske legeforening, Foreningen, Oslo, 120(2000)nr. 24, S. 2875-2877
BIBSYS 010834443

Theses

Jahnsen J (2004)
Bone metabolism and body compostition in patients with inflammatory bowel disease: a population-based study
In Series of dissertations submitted to the Faculty of Medicine, University of Oslo, Unipub, Oslo, no. 153, 1 b. (flere pag.)
BIBSYS 040849120, ISBN 82-8080-067-0