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  1. Article ; Online: Altered Tryptophan Levels in Patients With Inflammatory Bowel Disease Owing to Colonic Leakage, Metabolism, or Malabsorption?

    Bosch, Sofie / de Meij, Tim G J / de Boer, Nanne Kh

    Gastroenterology

    2018  Volume 154, Issue 6, Page(s) 1855–1856

    MeSH term(s) Colon ; Humans ; Inflammatory Bowel Diseases ; Malabsorption Syndromes ; Tryptophan
    Chemical Substances Tryptophan (8DUH1N11BX)
    Language English
    Publishing date 2018
    Publishing country United States
    Document type Letter ; Comment
    ZDB-ID 80112-4
    ISSN 1528-0012 ; 0016-5085
    ISSN (online) 1528-0012
    ISSN 0016-5085
    DOI 10.1053/j.gastro.2018.01.071
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Endoscopic and surgical treatment outcomes of colitis-associated advanced colorectal neoplasia: a multicenter cohort study.

    Derks, Monica Ew / Te Groen, Maarten / Peters, Charlotte P / Dijkstra, Gerard / de Vries, Annemarie C / Romkens, Tessa Eh / Horjus, Carmen S / de Boer, Nanne Kh / Bemelman, Willem A / Nagtegaal, Iris D / Derikx, Lauranne Aap / Hoentjen, Frank

    International journal of surgery (London, England)

    2023  Volume 109, Issue 7, Page(s) 1961–1969

    Abstract: Background: Inflammatory bowel disease (IBD) patients are at increased risk of advanced neoplasia (high-grade dysplasia or colorectal cancer). The authors aimed to (1) assess synchronous and metachronous neoplasia following (sub)total or proctocolectomy, ...

    Abstract Background: Inflammatory bowel disease (IBD) patients are at increased risk of advanced neoplasia (high-grade dysplasia or colorectal cancer). The authors aimed to (1) assess synchronous and metachronous neoplasia following (sub)total or proctocolectomy, partial colectomy or endoscopic resection for advanced neoplasia in IBD, and (2) identify factors associated with treatment choice.
    Material and methods: In this retrospective multicenter cohort study, the authors used the Dutch nationwide pathology databank (PALGA) to identify patients diagnosed with IBD and colonic advanced neoplasia (AN) between 1991 and 2020 in seven hospitals in the Netherlands. Logistic and Fine & Gray's subdistribution hazard models were used to assess adjusted subdistribution hazard ratios for metachronous neoplasia and associations with treatment choice.
    Results: The authors included 189 patients (high-grade dysplasia n =81; colorectal cancer n =108). Patients were treated with proctocolectomy ( n =33), (sub)total colectomy ( n =45), partial colectomy ( n =56) and endoscopic resection ( n =38). Partial colectomy was more frequently performed in patients with limited disease and older age, with similar patient characteristics between Crohn's disease and ulcerative colitis. Synchronous neoplasia was found in 43 patients (25.0%; (sub)total or proctocolectomy n =22, partial colectomy n =8, endoscopic resection n =13). The authors found a metachronous neoplasia rate of 6.1, 11.5 and 13.7 per 100 patient-years after (sub)total colectomy, partial colectomy and endoscopic resection, respectively. Endoscopic resection, but not partial colectomy, was associated with an increased metachronous neoplasia risk (adjusted subdistribution hazard ratios 4.16, 95% CI 1.64-10.54, P <0.01) compared with (sub)total colectomy.
    Conclusion: After confounder adjustment, partial colectomy yielded a similar metachronous neoplasia risk compared to (sub)total colectomy. High metachronous neoplasia rates after endoscopic resection underline the importance of strict subsequent endoscopic surveillance.
    MeSH term(s) Humans ; Cohort Studies ; Colonoscopy ; Colorectal Neoplasms/pathology ; Colitis/etiology ; Colitis/pathology ; Colitis/surgery ; Colitis, Ulcerative/surgery ; Inflammatory Bowel Diseases/complications ; Inflammatory Bowel Diseases/pathology ; Inflammatory Bowel Diseases/surgery ; Colonic Neoplasms/surgery ; Colectomy/adverse effects ; Treatment Outcome ; Retrospective Studies
    Language English
    Publishing date 2023-07-01
    Publishing country United States
    Document type Multicenter Study ; Journal Article
    ZDB-ID 2212038-5
    ISSN 1743-9159 ; 1743-9191
    ISSN (online) 1743-9159
    ISSN 1743-9191
    DOI 10.1097/JS9.0000000000000335
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: The potential of fecal microbiota and amino acids to detect and monitor patients with adenoma.

    Bosch, Sofie / Acharjee, Animesh / Quraishi, Mohammed N / Rojas, Patricia / Bakkali, Abdellatif / Jansen, Erwin Ew / Brizzio Brentar, Marina / Kuijvenhoven, Johan / Stokkers, Pieter / Struys, Eduard / Beggs, Andrew D / Gkoutos, Georgios V / de Meij, Tim Gj / de Boer, Nanne Kh

    Gut microbes

    2022  Volume 14, Issue 1, Page(s) 2038863

    Abstract: The risk of recurrent dysplastic colonic lesions is increased following polypectomy. Yield of endoscopic surveillance after adenoma removal is low, while interval colorectal cancers occur. To longitudinally assess the dynamics of fecal microbiota and ... ...

    Abstract The risk of recurrent dysplastic colonic lesions is increased following polypectomy. Yield of endoscopic surveillance after adenoma removal is low, while interval colorectal cancers occur. To longitudinally assess the dynamics of fecal microbiota and amino acids in the presence of adenomatous lesions and after their endoscopic removal. In this longitudinal case-control study, patients collected fecal samples prior to bowel preparation before scheduled colonoscopy and 3 months after this intervention. Based on colonoscopy outcomes, patients with advanced adenomas and nonadvanced adenomas (0.5-1.0 cm) who underwent polypectomy during endoscopy (
    MeSH term(s) Adenoma/diagnosis ; Adenoma/pathology ; Amino Acids ; Case-Control Studies ; Colorectal Neoplasms/pathology ; Gastrointestinal Microbiome ; Humans ; Risk Factors
    Chemical Substances Amino Acids
    Language English
    Publishing date 2022-02-18
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ISSN 1949-0984
    ISSN (online) 1949-0984
    DOI 10.1080/19490976.2022.2038863
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Integration of stool microbiota, proteome and amino acid profiles to discriminate patients with adenomas and colorectal cancer.

    Bosch, Sofie / Acharjee, Animesh / Quraishi, Mohammed Nabil / Bijnsdorp, Irene V / Rojas, Patricia / Bakkali, Abdellatif / Jansen, Erwin Ew / Stokkers, Pieter / Kuijvenhoven, Johan / Pham, Thang V / Beggs, Andrew D / Jimenez, Connie R / Struys, Eduard A / Gkoutos, Georgios V / de Meij, Tim Gj / de Boer, Nanne Kh

    Gut microbes

    2022  Volume 14, Issue 1, Page(s) 2139979

    Abstract: Background: Screening for colorectal cancer (CRC) reduces its mortality but has limited sensitivity and specificity. Aims We aimed to explore potential biomarker panels for CRC and adenoma detection and to gain insight into the interaction between gut ... ...

    Abstract Background: Screening for colorectal cancer (CRC) reduces its mortality but has limited sensitivity and specificity. Aims We aimed to explore potential biomarker panels for CRC and adenoma detection and to gain insight into the interaction between gut microbiota and human metabolism in the presence of these lesions.
    Methods: This multicenter case-control cohort was performed between February 2016 and November 2019. Consecutive patients ≥18 years with a scheduled colonoscopy were asked to participate and divided into three age, gender, body-mass index and smoking status-matched subgroups: CRC (n = 12), adenomas (n = 21) and controls (n = 20). Participants collected fecal samples prior to bowel preparation on which proteome (LC-MS/MS), microbiota (16S rRNA profiling) and amino acid (HPLC) composition were assessed. Best predictive markers were combined to create diagnostic biomarker panels. Pearson correlation-based analysis on selected markers was performed to create networks of all platforms.
    Results: Combining omics platforms provided new panels which outperformed hemoglobin in this cohort, currently used for screening (AUC 0.98, 0.95 and 0.87 for CRC vs controls, adenoma vs controls and CRC vs adenoma, respectively). Integration of data sets revealed markers associated with increased blood excretion, stress- and inflammatory responses and pointed toward downregulation of epithelial integrity.
    Conclusions: Integrating fecal microbiota, proteome and amino acids platforms provides for new biomarker panels that may improve noninvasive screening for adenomas and CRC, and may subsequently lead to lower incidence and mortality of colon cancer.
    MeSH term(s) Humans ; Proteome/analysis ; Colorectal Neoplasms/diagnosis ; Colorectal Neoplasms/genetics ; Chromatography, Liquid ; RNA, Ribosomal, 16S ; Amino Acids ; Gastrointestinal Microbiome ; Tandem Mass Spectrometry ; Adenoma/diagnosis ; Feces/chemistry
    Chemical Substances Proteome ; RNA, Ribosomal, 16S ; Amino Acids
    Language English
    Publishing date 2022-11-11
    Publishing country United States
    Document type Multicenter Study ; Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2575755-6
    ISSN 1949-0984 ; 1949-0984
    ISSN (online) 1949-0984
    ISSN 1949-0984
    DOI 10.1080/19490976.2022.2139979
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article: Golimumab for the treatment of ulcerative colitis.

    Löwenberg, Mark / de Boer, Nanne Kh / Hoentjen, Frank

    Clinical and experimental gastroenterology

    2014  Volume 7, Page(s) 53–59

    Abstract: The introduction of therapeutic antibodies against tumor necrosis factor (TNF) had a major impact on the treatment of ulcerative colitis (UC). Infliximab and adalimumab are powerful agents that are used for remission induction and maintenance therapy in ... ...

    Abstract The introduction of therapeutic antibodies against tumor necrosis factor (TNF) had a major impact on the treatment of ulcerative colitis (UC). Infliximab and adalimumab are powerful agents that are used for remission induction and maintenance therapy in UC and have an acceptable safety profile. However, a proportion of UC patients for whom therapy with anti-TNF agents is indicated fail or become intolerant to treatment with infliximab or adalimumab. Hence, there remains an unmet need for novel anti-TNF agents. Golimumab (Simponi®), a human anti-TNF antibody that is administered by monthly subcutaneous injections, is the most recently introduced TNF blocker for the treatment of UC. Here, we will discuss recent literature on clinical efficacy and safety of golimumab induction and maintenance treatment in patients with UC. Furthermore, we will discuss the positioning of golimumab for UC in current treatment algorithms.
    Language English
    Publishing date 2014-03-12
    Publishing country New Zealand
    Document type Journal Article ; Review
    ZDB-ID 2520690-4
    ISSN 1178-7023
    ISSN 1178-7023
    DOI 10.2147/CEG.S48741
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article: Management of Crohn's disease in poor responders to adalimumab.

    de Boer, Nanne Kh / Löwenberg, Mark / Hoentjen, Frank

    Clinical and experimental gastroenterology

    2014  Volume 7, Page(s) 83–92

    Abstract: Anti-tumor necrosis factor therapy with adalimumab is an effective therapy for the induction and maintenance of remission in moderate to severe Crohn's disease. Although a large proportion of patients show a favorable clinical response to adalimumab, ... ...

    Abstract Anti-tumor necrosis factor therapy with adalimumab is an effective therapy for the induction and maintenance of remission in moderate to severe Crohn's disease. Although a large proportion of patients show a favorable clinical response to adalimumab, therapy failure is common. In this review, we provide a practical overview of adalimumab therapy in patients with Crohn's disease, with a specific focus on the clinical management of adalimumab failure. In the case of inadequate efficacy, a thorough assessment is required to confirm inflammatory disease activity and rule out noninflammatory causes. Evaluation may include biomarkers (fecal calprotectin and serum C-reactive protein), colonoscopy, and/or magnetic resonance enterography/enteroclysis. Furthermore, adalimumab trough levels and antibodies to adalimumab are informational after the confirmation of active inflammation. In the case of low or undetectable adalimumab trough levels, dose escalation to 40 mg weekly is recommended, whereas high antibody titers or adverse events frequently require switching to an alternative anti-TNF agent such as infliximab. Active inflammation despite therapeutic adalimumab trough levels requires alternative strategies such as switching to drugs with a different mode of action or surgical intervention.
    Language English
    Publishing date 2014-04-11
    Publishing country New Zealand
    Document type Journal Article ; Review
    ZDB-ID 2520690-4
    ISSN 1178-7023
    ISSN 1178-7023
    DOI 10.2147/CEG.S47627
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article ; Online: Efficacy of thioguanine treatment in inflammatory bowel disease: A systematic review.

    Meijer, Berrie / Mulder, Chris Jj / Peters, Godefridus J / van Bodegraven, Adriaan A / de Boer, Nanne Kh

    World journal of gastroenterology

    2016  Volume 22, Issue 40, Page(s) 9012–9021

    Abstract: Aim: To critically assess the available literature regarding the efficacy of thioguanine treatment in inflammatory bowel disease (IBD) patients, irrespective of the (hepato-) toxicity profile.: Methods: A systematic literature search of the MEDLINE ... ...

    Abstract Aim: To critically assess the available literature regarding the efficacy of thioguanine treatment in inflammatory bowel disease (IBD) patients, irrespective of the (hepato-) toxicity profile.
    Methods: A systematic literature search of the MEDLINE database using PubMed was performed using the keywords "thioguanine", "6-TG", "thioguanine", "inflammatory bowel disease", "IBD", "Crohn's disease", "Ulcerative colitis" and "effectiveness" in order to identify relevant articles published in English starting from 2000. Reference lists of the included articles were cross-checked for missing articles. Reviewed manuscripts concerning the effectiveness of thioguanine treatment in IBD were reviewed by the authors and the data were extracted. Data were subsequently analyzed with descriptive statistics. Due to the lack of standardized outcomes, a formal meta-analysis was not performed.
    Results: A total of 11 applicable studies were found that involved the effectiveness of thioguanine therapy in IBD. Eight studies were conducted in a prospective manner, in the remaining three studies, data was collected retrospectively. In total, 353 IBD-patients (225 patients with Crohn's disease, 119 with ulcerative colitis and nine with unclassified IBD) with prior azathioprine/mercaptopurine resistance and/or intolerance (
    Conclusion: The efficacy of thioguanine therapy in IBD patients intolerant to conventional thiopurine therapy is observed in 65%, with short term adverse events in 20% of patients.
    MeSH term(s) Antimetabolites, Antineoplastic/therapeutic use ; Humans ; Inflammatory Bowel Diseases/drug therapy ; Thioguanine/therapeutic use
    Chemical Substances Antimetabolites, Antineoplastic ; Thioguanine (FTK8U1GZNX)
    Language English
    Publishing date 2016-10-28
    Publishing country United States
    Document type Journal Article ; Review
    ZDB-ID 2185929-2
    ISSN 2219-2840 ; 1007-9327
    ISSN (online) 2219-2840
    ISSN 1007-9327
    DOI 10.3748/wjg.v22.i40.9012
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Article ; Online: The influence of lifestyle factors on fecal volatile organic compound composition as measured by an electronic nose.

    Bosch, Sofie / Lemmen, Jesse Pm / Menezes, Renée / van der Hulst, René / Kuijvenhoven, Johan / Stokkers, Pieter Cf / de Meij, Tim Gj / de Boer, Nanne Kh

    Journal of breath research

    2019  Volume 13, Issue 4, Page(s) 46001

    Abstract: Introduction: Fecal volatile organic compounds (VOCs) are gaseous metabolic products which are increasingly considered potential non-invasive biomarkers for the detection of various (gastrointestinal) diseases. The influence of lifestyle factors on ... ...

    Abstract Introduction: Fecal volatile organic compounds (VOCs) are gaseous metabolic products which are increasingly considered potential non-invasive biomarkers for the detection of various (gastrointestinal) diseases. The influence of lifestyle factors on fecal VOC patterns remains unexplored but is of importance prior to implementation of VOC analysis as a diagnostic tool. The aim of this study was to investigate the effects of age, gender, body mass index, smoking status, dietary preferences, medication use and co-morbidity on fecal VOC patterns.
    Methods: For this study, fecal samples of patients undergoing a colonoscopy were collected prior to endoscopy. All participants completed a questionnaire on lifestyle factors, co-morbidity and medication use. Patients without colonic abnormalities were included in this study. Fecal VOC patterns were analyzed by means of an electronic nose (eNose) device (Cyranose
    Results: From the 1039 participants willing to participate in the initial study, 211 were eligible as controls. All unique lifestyle variables investigated in this study affected the fecal VOC composition. The strongest influences were caused by low BMI, a vegetarian diet and an active smoking status, whereas the least influence was found for the variables gender, age > 55 years and previous smokers.
    Discussion: Age, gender, BMI, smoking habits, dietary preferences, co-morbidity and medication use all have unique effects on fecal VOC composition. Future studies should carefully consider this influence on VOC outcome when defining VOC signatures as biomarker for diagnostic purposes.
    MeSH term(s) Adolescent ; Adult ; Aged ; Aged, 80 and over ; Breath Tests ; Electronic Nose ; Factor Analysis, Statistical ; Feces/chemistry ; Female ; Humans ; Life Style ; Male ; Middle Aged ; Volatile Organic Compounds/analysis ; Young Adult
    Chemical Substances Volatile Organic Compounds
    Language English
    Publishing date 2019-06-25
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2381007-5
    ISSN 1752-7163 ; 1752-7155
    ISSN (online) 1752-7163
    ISSN 1752-7155
    DOI 10.1088/1752-7163/ab2775
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  9. Article ; Online: High inter-individual variability of serum xanthine oxidoreductase activity in IBD patients.

    Meijer, Berrie / Seinen, Margien L / Hosman, Tessa / Linskens, Ronald K / Kneppelhout, Jan-Kees / Peters, Godefridus J / Mulder, Chris Jj / van Bodegraven, Adriaan A / de Boer, Nanne Kh

    Nucleosides, nucleotides & nucleic acids

    2018  Volume 37, Issue 6, Page(s) 317–323

    Abstract: Objectives: Thiopurines play an essential role in the management of inflammatory bowel diseases (IBD, i.e. Crohn's disease and ulcerative colitis). Over the past decade, several strategies to optimize treatment with thiopurines have been evaluated, ... ...

    Abstract Objectives: Thiopurines play an essential role in the management of inflammatory bowel diseases (IBD, i.e. Crohn's disease and ulcerative colitis). Over the past decade, several strategies to optimize treatment with thiopurines have been evaluated, including co-administration of allopurinol, a xanthine-oxidoreductase (XO) inhibitor, to low-dose thiopurine therapy. We aimed to assess the inter-individual variability of XO-activity between IBD-patients.
    Methods: We assessed XO activity in serum of IBD-patients of two medical centers in The Netherlands using the Amplex® Red Xanthine/Xanthine Oxidase Assay Kit, which measures the superoxide formation in a coupled reaction to the red-fluorescent oxidation product, resofurine.
    Results: We observed a high inter-individual variability of XO-activity in 119 patients, with a median activity of 16 µU/ml/hour (range 1-85 µU/ml/hour). The XO-activity was influenced by gender (male 19.5 vs. female 14.0 µU/ml/hour, p < 0.01), patient's age (Pearson's correlation r = 0.21, p = 0.02) and duration of IBD (r = 0.23, p = 0.01). The XO activity was not affected by the type of IBD, smoking status, body mass index or (type of) thiopurine use (p > 0.05).
    Conclusions: There is a high inter-individual variability of XO-activity in IBD-patients; XO-activity is positively associated with male gender and patient's age.
    MeSH term(s) Adult ; Age Factors ; Aged ; Aged, 80 and over ; Cross-Sectional Studies ; Female ; Humans ; Inflammatory Bowel Diseases/blood ; Male ; Middle Aged ; Retrospective Studies ; Sex Factors ; Signal Transduction ; Xanthine Dehydrogenase/blood ; Young Adult
    Chemical Substances Xanthine Dehydrogenase (EC 1.17.1.4)
    Language English
    Publishing date 2018-05-03
    Publishing country United States
    Document type Journal Article ; Multicenter Study
    ZDB-ID 2008956-9
    ISSN 1532-2335 ; 1525-7770
    ISSN (online) 1532-2335
    ISSN 1525-7770
    DOI 10.1080/15257770.2018.1460477
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  10. Article: Diarrhoea in a patient with metastatic melanoma: Ipilimumab ileocolitis treated with infliximab.

    Slangen, Rob Me / van den Eertwegh, Alfonsus Jm / van Bodegraven, Adriaan A / de Boer, Nanne Kh

    World journal of gastrointestinal pharmacology and therapeutics

    2013  Volume 4, Issue 3, Page(s) 80–82

    Abstract: Administration of ipilimumab, a cytotoxic T-lymphocyte associated antigen-4-blocking monoclonal antibody, leads to enhancement of the anti-tumor T-cell respons and as a result shows a significant survival benefit in metastatic melanoma patients. ... ...

    Abstract Administration of ipilimumab, a cytotoxic T-lymphocyte associated antigen-4-blocking monoclonal antibody, leads to enhancement of the anti-tumor T-cell respons and as a result shows a significant survival benefit in metastatic melanoma patients. Therefore patients are currently receiving this promising therapy as a second-line strategy. Unfortunately, by activation of the T-cell immune response, ipilimumab therapy may lead to an unwanted induction of different autoimmune phenomena. Diarrhoea and colitis occur in up to one third of patients. Here we present a case of ipilimumab induced ileocolitis which was successfully treated with infliximab, an anti-tumor necrosis factor monoclonal antibody, after corticosteroid therapy failure. Although formal trials are lacking, recently publicated series suggest that infusional therapy of infliximab is effective in ipilimumab induced ileocolitis.
    Language English
    Publishing date 2013-06-14
    Publishing country United States
    Document type Journal Article
    ZDB-ID 2583480-0
    ISSN 2150-5349
    ISSN 2150-5349
    DOI 10.4292/wjgpt.v4.i3.80
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