References of "Van Steen, Kristel"
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See detailTolerability of shortened infliximab infusion times in patients with inflammatory bowel disease: a single center cohort study
Breynaert, C; Ferrante, F; Fidder, H et al

in Acta Gastro-Enterologica Belgica (2011)

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See detailMucosal gene expression of cell adhesion molecules, chemokines, and chemokine receptors in patients with inflammatory bowel disease before and after infliximab treatment.
Arijs, Ingrid; De Hertogh, Gert; Machiels, Kathleen et al

in Acta Gastro-Enterologica Belgica (2011), 106(4), 748-61

OBJECTIVES: Inflammatory bowel disease (IBD) is characterized by a continuous influx of leukocytes into the gut wall. This migration is regulated by cell adhesion molecules (CAMs), and selective ... [more ▼]

OBJECTIVES: Inflammatory bowel disease (IBD) is characterized by a continuous influx of leukocytes into the gut wall. This migration is regulated by cell adhesion molecules (CAMs), and selective antimigration therapies have been developed. This study investigated the effect of infliximab therapy on the mucosal gene expression of CAMs in IBD. METHODS: Mucosal gene expression of 69 leukocyte/endothelial CAMs and E-cadherin was investigated in 61 IBD patients before and after first infliximab infusion and in 12 normal controls, using Affymetrix gene expression microarrays. Quantitative reverse transcriptase-PCR (qRT-PCR), immunohistochemistry, and western blotting were used to confirm the microarray data. RESULTS: When compared with control colons, the colonic mucosal gene expression of most leukocyte/endothelial adhesion molecules was upregulated and E-cadherin gene expression was downregulated in active colonic IBD (IBDc) before therapy, with no significant colonic gene expression differences between ulcerative colitis and colonic Crohn's disease. Infliximab therapy restored the upregulations of leukocyte CAMs in IBDc responders to infliximab that paralleled the disappearance of the inflammatory cells from the colonic lamina propria. Also, the colonic gene expression of endothelial CAMs and of most chemokines/chemokine receptors returned to normal after therapy in IBDc responders, and only CCL20 and CXCL1-2 expression remained increased after therapy in IBDc responders vs. control colons. When compared with control ileums, the ileal gene expression of MADCAM1, THY1, PECAM1, CCL28, CXCL1, -2, -5, -6, and -11, and IL8 was increased and CD58 expression was decreased in active ileal Crohn's disease (CDi) before therapy, and none of the genes remained dysregulated after therapy in CDi responders vs. control ileums. This microarray study identified a number of interesting targets for antiadhesion therapy including PECAM1, IL8, and CCL20, besides the currently studied alpha4beta7 integrin-MADCAM1 axis. CONCLUSIONS: Our data demonstrate that many leukocyte/endothelial CAMs and chemokines/chemokine receptors are upregulated in inflamed IBD mucosa. Controlling the inflammation with infliximab restores most of these dysregulations in IBD. These results show that at least part of the mechanism of anti-tumor necrosis factor-alpha therapy goes through downregulation of certain adhesion molecules. [less ▲]

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See detailMucosal gene expression of cell adhesion molecules, chemokines, and chemokine receptors in patients with inflammatory bowel disease before and after infliximab treatment.
Arijs, Ingrid; De Hertogh, Gert; Machiels, Kathleen et al

in American Journal of Gastroenterology (2011)

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See detailRisk Of Malignancies In A Single Center Cohort Of IBD-Patients Treated with Immunosuppressives and Anti-TNF-antibodies
Steinborn, A; Beigel, F; Breiteneicher, S et al

in American Journal of Gastroenterology (2011)

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See detailRisk Of Malignancies In A Single Center Cohort Of IBD-Patients Treated with Immunosuppressives and Anti-TNF-antibodies
Steinborn, A; Beigel, F; Breiteneicher, S et al

in Journal of Crohn’s and Colitis (2011)

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See detailRate of Malignancies and Infections in a Large Single Center Cohort of IBD Patients Treated With Thiopurines and Anti-TNF-Antibodies.
Ochsenkühn, T; Steinborn, A; Beigel, F et al

in Journal of Crohn’s and Colitis (2011)

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See detailTravelling the world of gene-gene interactions
Van Steen, Kristel ULg

in Briefings in Bioinformatics (2011), 13(1), 1-19

Over the last few years, main effect genetic association analysis has proven to be a successful tool to unravel genetic risk components to a variety of complex diseases. In the quest for disease ... [more ▼]

Over the last few years, main effect genetic association analysis has proven to be a successful tool to unravel genetic risk components to a variety of complex diseases. In the quest for disease susceptibility factors and the search for the 'missing heritability', supplementary and complementary efforts have been undertaken. These include the inclusion of several genetic inheritance assumptions in model development, the consideration of different sources of information, and the acknowledgement of disease underlying pathways of networks. The search for epistasis or gene-gene interaction effects on traits of interest is marked by an exponential growth, not only in terms of methodological development, but also in terms of practical applications, translation of statistical epistasis to biological epistasis and integration of omics information sources. The current popularity of the field, as well as its attraction to interdisciplinary teams, each making valuable contributions with sometimes rather unique viewpoints, renders it impossible to give an exhaustive review of to-date available approaches for epistasis screening. The purpose of this work is to give a perspective view on a selection of currently active analysis strategies and concerns in the context of epistasis detection, and to provide an eye to the future of gene-gene interaction analysis. [less ▲]

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See detailGenetic variation in the autophagy gene ULK1 and risk of Crohn's disease
Henckaerts, Liesbeth; Cleynen, Isabelle; Brinar, Marko et al

in Inflammatory Bowel Diseases (2011), 17(6), 1392-1397

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See detailModel-Based Multifactor Dimensionality Reduction for detecting epistasis in case-control data in the presence of noise
Cattaert, Tom ULg; Calle, Luz M; Dudek, Scott T et al

in Annals of Human Genetics (2011), 75(1), 78-89

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See detailLong term evolution and impact of immunomodulator cotreatment and withdrawal on infliximab on trough levels in 223 patients with Crohn's disease
Drobne, D; Bossuyt, P; Breynaert, C et al

in Journal of Crohn’s and Colitis [=JCC] (2011)

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See detailThe protease genes CYLD and USP40 are associated with Crohn's disease: results from a European Consortium
Cleynen, I; Artieda, M; Szczyoiorska, M et al

in Gastroenterology (2011), 140(5), 269

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See detailAnti-TNF induced skin manifestations in IBD patients: characterization and search for predisposing factors
Cleynen, I; Van Moerkercke, W; Vande Casteele, N et al

in Acta Gastro-Enterologica Belgica (2011), 74

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See detailProfile of Belgian Pediatric Crohn's Disease Patients: Associations between variables at diagnosis
De Greef, E; Hoffman, I; Smets, F et al

in Gastroenterology (2011), 140(5), 787

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See detailProfile of Belgian Pediatric Crohn's Disease Patients: Associations between variables at diagnosis
De Greef, E; Hoffman, I; Smets, F et al

in Acta Gastro-Enterologica Belgica (2011), 74

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See detailProfile of Belgian Pediatric Crohn's Disease Patients: Associations between variables at diagnosis
De Greef, E; Hoffman, I; Smets, F et al

in Journal of Crohn’s and Colitis [=JCC] (2011), 5(1), 156

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See detailProfile of Belgian Pediatric Crohn's Disease Patients: Presentation and diagnostic features
De Greef, E; Hoffman, I; Smets, F et al

in Gastroenterology (2011), 140(5), 786

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See detailProfile of Belgian Pediatric Crohn's Disease Patients: Presentation and diagnostic features
De Greef, E; Hoffman, I; Smets, F et al

in Acta Gastro-Enterologica Belgica (2011), 74

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See detailProfile of Belgian Pediatric Crohn's Disease Patients: Presentation and diagnostic features
De Greef, E; Hoffman, I; Smets, F et al

in Journal of Crohn’s and Colitis [=JCC] (2011), 5(1), 155

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See detailPerspectives on genome-wide multi-stage family-based association studies.
Van Steen, Kristel ULg

in Statistics in Medicine (2011), 30(18), 2201-2221

With the establishment of large consortiums of researchers, genome-wide association (GWA) studies have become increasingly popular and feasible. Although most of these association studies focus on ... [more ▼]

With the establishment of large consortiums of researchers, genome-wide association (GWA) studies have become increasingly popular and feasible. Although most of these association studies focus on unrelated individuals, a lot of advantages can be exploited by including families in the analysis as well. To overcome the additional genotyping cost, multi-stage designs are particularly useful. In this article, I offer a perspective view on genome-wide family-based association analyses, both within a model-based and model-free paradigm. I highlight how multi-stage designs and analysis techniques, which are quite popular in clinical epidemiology, can enter GWA settings. I furthermore discuss how they have proven successful in reducing analysis complexity, and in overcoming one of the most cumbersome statistical hurdles in the genome-wide context, namely controlling increased false positives due to multiple testing. [less ▲]

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