COmparison of MicroBiota AccordIng to Age in Crohn's Disease (COMeBACk)

Crohn's Disease Clinical Trial

— COMeBACk  

Official title:

Comparison of Fecal Microbiota Between Patients With Early and Late Crohn's Disease and Relationship With Different Genetic and Serological Profiles

Clinical Trial Details — Status: Recruiting

Administrative data

• NCT number: NCT02839317
• Other study ID #: 2013_71
• Secondary ID: 2014-A01225-42
• Status: Recruiting
• Start date: May 9, 2016
• Est. completion date: May 2024

Study information

• Verified date: August 2022
• Source: University Hospital, Lille
• Contact: Corinne Gower-Rousseau, MD, PhD
• Phone: +33320445518
• Email: corinne.gower[@]chru-lille.fr
• Is FDA regulated: No
• Study type: Observational

Clinical Trial Summary

The cause of CD could be different according to age at onset of CD symptoms. Indeed we know that some very young patients at CD diagnosis have particular genetic variants as abnormalities of the IL10R that are regarded as quite monogenic disease. In the other way, the microbiota also undergoes substantial changes at the extremes of life, in infants and older people and the ramifications of which are very few being explored. The comparison of microbiota by principal component analysis and genetic profile of patients with CD beginning at the extremes of life could help us to better known physiopathology of CD according to age and provide arguments that CD beginning at the extremes of life could be different diseases.

The aim of the study is to ascertain through population-based study the hypothesis that gut microbiota is different between paediatric-onset and elderly-onset CD patients in relation with genetic and environmental mechanisms. The results will provide a better knowledge of the etiopathogenic ways in CD and propose a personalized therapeutic care based on age at CD onset (i.e. according to the gut bacteria involved).

Description:

The primary aim is to describe by principal component analysis and compare the gut microbiota between subgroups of paediatric-onset (n=75), elderly-onset CD patients (n=75) and control subjects (75 paediatric control and 75 elderly control subjects matched on age) without an a priori approach of high throughput sequencing of bacterial DNA. As it has been shown that the type of IBD-associated dysbiosis depends on ileal involvement, Paediatric-onset and elderly-onset CD patients will be stratified according this parameter.

The secondary aims are:

• (I) Find specific bacteria involved in paediatric- and elderly-onset patients using PLS Discriminant Analysis (PLS-DA) that is a classical PLS regression (with a regression mode) but where the response variable is categorical.

• (II) Search for an association between bacterial dysbiosis and different genetic backgrounds in patients according to age at CD onset (paediatric-onset vs elderly-onset) and in control subjects;

• (III) Quantify of bacteria with invasive properties (E. coli, including adherent-invasive E.coli, Shigella, Salmonella, Yersinia, Campylobacter), and fecal fungal flora (Candida albicans, in particular) and their association with genetic and serological profiles according to age at CD onset and in control subjects; this study will include the comparison of the gut microbiome between subgroups of paediatric-onset, elderly-onset CD patients and control subjects.

• (IV) Study of environmental risk factors using a questionnaire to be submitted to CD patients and control subjects.

The results would provide a better knowledge of the etiopathogenic ways in CD and would downstream open the way towards clinical trials focused on specific microbiota disorders according to age at CD onset. This project will help to decipher the potential involvement of specific bacteria in the physiopathology of CD. This could lead to the development of new therapeutic strategies either using optimized current treatments targeting bacteria. Data from clinical trials which for the great majority rarely include paediatric patients and set an upper limit for study eligibility at 65 years of age are thus focusing on adult-onset disease. Thus the potential specificities of paediatric- and elderly-onset diseases are not taken into account. A better knowledge of characteristics of CD at the extreme of life will be important to set up innovative clinical trials including specific therapeutics adapted to patients where disease occurred at the extreme age of life, especially as these patients did not benefited of specific trials. The ultimate goal is a better quality of care delivered to paediatric- and elderly-onset CD patients.

Recruitment information / eligibility

• Status: Recruiting
• Enrollment: 300
• Est. completion date: May 2024
• Est. primary completion date: May 2024
• Accepts healthy volunteers: Accepts Healthy Volunteers
• Gender: All
• Age group: 8 Years to 80 Years

Eligibility

Inclusion Criteria:

• CD patients Patients aged less than 17 years (paediatric-CD group) or more than 40 years (elderly-CD group) at definite or probable CD diagnosis, defined according to Epimad's criteria2,4.

CD diagnosis within 5 years prior inclusion. Patients with CD in remission with or without corticosteroids, 5-ASA or nutrition.

Agreeing to participate in the project and have signed consent, Being insured

• Control subjects Patients aged less than 17 years (paediatric-control group) or more than 40 years (elderly-control group) Agreeing to participate in the project and have signed consent, Being insured

Exclusion Criteria:

• Pregnant or lactating Subject who underwent bowel resection Subject taking antibiotics, prebiotics, probiotics or bowel preparation in 6 weeks sampling seat will be temporarily suspended. The sampling will be done remotely and delayed (> 6 weeks) of treatment discontinuation or antibiotic bowel preparation.

A person taking or have taken a topical treatment within 6 weeks before inclusion Persons who have undergone surgical resection Nobody emergency Topic guardianship, curator ship or judicial protection, persons deprived of liberty Subject does not speak French Subject unable to answer questions or express

Related Conditions & MeSH terms

• Crohn Disease
• Crohn's Disease

Intervention

Biological:
• Biological
comparison of microbiota, genetic profile between pediatric- and elderly-onset CD

Locations

Country	Name	City	State
France	Amiens University & Hospital	Amiens
France	Lille Hôpital Huriez	Lille
France	Lille Jean de Flandre Hospital	Lille
France	Lille University Hospital & EPIMAD Registry	Lille
France	Rouen University & Hospital	Rouen

Sponsors (2)

Lead Sponsor	Collaborator
University Hospital, Lille	National Research Agency, France

Country where clinical trial is conducted

France, 

Outcome

Type	Measure	Description	Time frame	Safety issue
Primary	Analysis of microbiota	To describe by principal component analysis and compare the gut microbiota between subgroups of paediatric-onset (n=75), elderly-onset CD patients (n=75) and controls (150).	1 YEAR
Secondary	Specific bacteria	Find specific bacteria involved in paediatric- and elderly-onset patients using PLS Discriminant Analysis (PLS-DA)	1 YEAR
Secondary	Association between bacterial dysbiosis and different genetic backgrounds	Search for an association between bacterial dysbiosis and different genetic backgrounds in patients according to age at CD onset (paediatric-onset vs elderly-onset) and in controls	1 YEAR
Secondary	Presence of bacteria with invasive properties (E. coli, including adherent-invasive E.coli, Shigella, Salmonella, Yersinia, Campylobacter), and fecal fungal flora (Candida albicans, in particular)	Quantify of bacteria with invasive properties (E. coli, including adherent-invasive E.coli, Shigella, Salmonella, Yersinia, Campylobacter), and fecal fungal flora (Candida albicans, in particular)	1 YEAR
Secondary	Environmental risk factors	Study of environmental risk factors using a questionnaire to be submitted to CD patients and controls .	1 YEAR