Crohn disease (CD) usually evolves by surges interspersed by periods of unpredictable remission. the probability of recurrence of CD in a patient in remission is even stronger if it pre-exists endoscopic lesions of the intestinal mucosa.

The mucosal healing exploration needs the realization of an ileo-colonoscopy under general anesthesia which is an invasive procedure, restrictive and expensive, thus prohibiting its too frequent repetition. we do not currently have noninvasive and reliable markers able to predict the occurrence of thrust of CD and allow the introduction of a more suitable treatment.

Indeed, relapse prevention is the best way to avoid complications and formation of lesions that lead to the irreversible medical treatment failure and surgery.

Since during the CD, it is the immunological changes that lead to inflammation and lesions, we make the assumption that the ability of certain markers immunological to predict a relapse of CD is higher than that of other in particular inflammatory markers.

This work should help to identify the profile of patients with CD in remission but at high risk of recurrence. It will specify i) the potential new markers immunological, from the pre-clinical research, predict the onset of a recurrence of CD ; ii) the predictive interest of different inflammatory markers used in routine or during the CD evaluation ; iii) Finally, the stress and the management of stressful events in the occurrence of a relapse.

This work also will specify the evolution of different markers at the moment of thrust

Inclusion Criteria:

• Patient over 18 years.
• Patient with CD previously diagnosed according to standard criteria.
• Patient remission (HBS≤4) for at least 3 months and has not received corticosteroids (including budesonide) in the 3 months before.
• Patient without concomitant treatment of Crohn's disease or as stable dose (5-ASA, corticosteroids, immunosuppressants, anti-TNF) immunosuppressants (azathioprine, Purinethol, methotrexate) and / or anti-TNF and / or 5- amino salicylates (5-ASA) for at least 6 months.
• Patient who signed a consent.
• Patient affiliated to a social security scheme.

Exclusion Criteria:

• A patient with an active CD (HB score≥5).
• Patient who relapsed in the previous three months before inclusion.
• Patient who received corticosteroids (including budesonide) in the 6 months prior to inclusion.
• Patients on stable dose of non-anti-TNF in the 6 months prior to inclusion.
• Patient taking nonsteroidal anti-inflammatory drugs or antibiotics.
• Patient with complications of intestinal sub-occlusion type fistulas or abdominal abscesses.
• Patient with exclusive perianal disease or a predominate perianal manifestation.
• Pregnant women (examination).
• Patient who is the subject of extensive intestinal resection (> 1 m).
• Patient with ileostomy or colostomy.
• Patient on legal protection measure or who does not have the legal capacity to consent
• Lack of signed written consent of the patient.-

Patients with Crohn Disease