Active clinical trials for "Intestinal Diseases"

This pilot prospective study will investigate the role of microbiota and known enteropathogens in Acute Severe Ulcerative Colitis (ASUC). Investigators will compare a group of patients hospitalized for an ASUC with patients experiencing a Non-Severe Ulcerative Colitis (NSUC) flare by investigating microbiome, metabolome and transcriptome and integrating this data through a multi-omic framework. This systems biology approach aims at enhance our understanding of this severe event, define diagnosis and prognosis biomarkers to improve medical therapy and avoid colectomy and/or death.

To assess the prevalance of non_alcoholic fatty liver diseases in inflammatory bowel disease patients and its relation to type of treatment given and disease severity

The associations between female inflammatory bowel disease (IBD) patients and human papilloma virus (HPV) infection and cervical neoplasia (dysplasia or cancer) were unclear. Especially there was no data for Chinese IBD population. So we investigated the incidence and risk factors of HPV infection and cervical neoplasia (dysplasia or cancer) in female IBD patient.

This research plans to collect rectal cancer patients after sphincter-preserving surgery from 14 institutions in China mainland, observe the incidence and risk factors about bowel dysfunction after operation.

The investigators wish to characterize alterations in the architecture and function of immune cells in patients with a primary immunodeficiency that also develop inflammatory bowel disease. In addition, The investigators' goal is to characterize the microbiome of these patients, in order to determine whether specific microbial alterations are related to inflammation.

Extramural venous invasion (EMVI) is the spread of microscopic tumour cells into the veins around the tumour. Rectal cancer treatment has improved greatly over recent years. However, it is important for us to learn as much about the tumours as possible in order to develop newer therapies. Current treatments may benefit from new genetic information relating to the cancer. We hope to identify genetic differences in certain types of rectal cancer which will allow future treatments.

The study aims to: Determine whether the density of epithelial gaps in terminal ileum of patients with irritable bowel syndrome (IBS) is different from that in inflammatory bowel disease (IBD) patients and normal controls by confocal laser endomicroscopy (CLE). Evaluate the relationship between the density of epithelial gaps and IBS subtypes, and visceral hypersensitivity.

Discriminating irritable bowel syndrome (IBS) from inflammatory bowel disease (IBD), especially with mild disease activity, is common clinical challenge. Most of the patients with suspected IBS have to go invasive procedures (colonoscopy/gastroscopy). In order to avoid invasive investigations, there is a search for noninvasive markers with the capacity to distinguish between IBS and IBD. Dr Hossam Haick (Department of Chemical Engineering, Technion) developed a system that combines nano-metals produced in his laboratory with electrical devices (transistors). The combination between a nanomaterial and an electrical transistor induces a change in its electrical behavior upon exposure to the material being examined; that is, a change in its electrical properties. The change in its electrical behavior is translated into a computerized graphic signal. The electronic nose is composed of an air pump, a filter for filtering external contaminants and an array of sensors. Each sensor transmits a signal according to the materials it "knows" how to identify. Thus, it is possible to characterize most of the substance families characteristic of a certain disease, and the same system is designed for differential diagnosis of different diseases. The purpose of the investigators study is to use the "electronic nose" to find bio-markers that will help to diagnose IBD and IBS without using invasive procedures. The plan is to collect 200 samples (50 IBS' 50 Crohn's disease, 50 ulcerative colitis and 50 controls). The patients included in the study will undergo an evaluation by a gastroenterologist after signing an informed consent and will answer a questionnaire. The samples will analyzed in the laboratory of Dr. Haick.

Our overall objective in this study is to study the role of B cells in inflammatory bowel disease (IBD), using a combination of high-throughput experimental and novel bioinformatical techniques. Idiopathic IBD includes Crohn's disease (CD) and Ulcerative Colitis (UC), which are chronic inflammatory disorders of the intestine. IBD is common in developed countries, with up to 1 in 200 of individuals affected by theses diseases. It is currently thought that the disease arises owing to a complex array of genetic, environmental and immunologic susceptibility factors. T cells are thought to cause the lesions, but the B cell population apparently has a significant role as well, through secreting antibodies against certain self-antigens. We believe that a major contribution to the understanding of the pathogenesis of IBD, and especially of the immune pathway leading to CD, can be achieved by analysis of the B cell clones participating in immune responses in the gut, in particular their immunoglobulin (Ig) variable region gene diversity, which has never before been studied in the context of IBD. The adaptive immune system is one of the only two biological systems capable of continuously learning and memorizing its experiences. This is a highly complex, distributed system, in which pathogen recognition, decision-making and action are performed by an interacting network of diverse lymphocytes. Immune learning and memory are embedded in the dynamical states of the complete lymphocyte repertoire, and cannot be understood by studying the behavior of single cell types. This complexity, further increased by the non-linear behavior of each component, can only be elucidated by using theoretical tools to complement experimental and clinical studies. Needless to say, many aspects of the deregulation of lymphocyte clones are not evident in the phenotype of the single cell but rather in the population dynamics of a whole clone (or many clones) of cells, as in B cell lymphomas. Such aspects are best elucidated by studies of the population dynamics and genetics of the relevant B cell clone(s). In this study, we propose to utilize a novel bioinformatical approach - the analysis of the shapes of Ig gene mutational lineage trees. This is the main innovative feature in our proposal, as it taps into parameters that have never before been measured or analyzed with respect to B lymphocytes in IBD. While the method is new, it has already been shown that graphical analysis of B cell lineage trees and mathematical quantification of tree properties provide novel insights into the mechanisms of normal and malignant B cell clonal evolution. A preliminary analysis of lineage trees from other autoimmune diseases (shown below) indicates that, given sufficient amounts of data, the method could elucidate changes in Ig gene diversification and selection in IBD patients. Moreover, we aim to search for correlations between the parameters characterizing Ig gene diversification and parameters characterizing patients, disease history and severity, and histological markers, as this has the potential of yielding novel diagnostic and prognostic tools.