Is Local Injection of Mesenchymal Stem Cells After Endosc... | NCT06317818

Status Module

Arms/Interventions Module

Arm Groups

Label	Type	Description	Intervention Names
"MSCs" group	Experimental	One local injection of MSCs (3*10^7 cells) after endoscopic dilatation of the stricture	Other: Mesenchymal Stem Cells
"control" group	Placebo Comparator	One local injection of the placebo (cell-free cell suspension solution devoid of cells) after endoscopic dilatation of the stricture	Other: Comparative placebo

Name	Type	Description	Arm Group Labels	Other Names
Mesenchymal Stem Cells	Other	Suspension of mesenchymal stromal cells for intratissular injection	"MSCs" group

Outcomes Module

Primary Outcomes

Measure	Description	Time Frame
Assessment of safety of local MSCs injection, in association with endoscopic dilation, in strictures of patients with Crohn's disease.	Recording of occurrence of adverse events (serious or not) up to week 48	From Week 0 to Week 48
Assessment of efficacy of local MSCs injection, in association with endoscopic dilation, in strictures of patients with Crohn's disease by evaluating symptomatic clinical response	The symptomatic clinical response will be assessed by a composite score, calculated over an average of 7 days, taking up 2 of the 16 questions of the S-PRO or Stenosis Patient Reported Outcome in English (also called Stricturing Crohn's Disease Questionnaire). A score for postprandial abdominal pain < 2 and an average score, out of 7 days, for amount of types of food <2 also.	Between Week 0, Week 24 and Week 48
Assessment of efficacy of local MSCs injection, in association with endoscopic dilation, in strictures of patients with Crohn's disease by evaluating endoscopic response	The endoscopic response will be defined by the ability to pass an adult colonoscope (complete endoscopic response) or an increase in lumen diameter (partial endoscopic response) measured in comparison with the size of an open biopsy forceps (7mm)	Between Week 0, Week 24 and Week 48
Assessment of efficacy of local MSCs injection, in association with endoscopic dilation, in strictures of patients with Crohn's disease by evaluating radiological response	The radiological response will be defined by the presence of 3 of the 4 following criteria: (1) an improvement in luminal narrowing (improvement greater than 50% and/or reduction in luminal diameter of less than 50%); (2) improvement in pre-stenotic dilation (pre-stenotic dilation reduced by 50%, bowel diameter equal to normal bowel and/or pre-stenotic dilation improved to less than 2.5 cm); (3) reduction in wall thickening (50% improvement in gut wall thickening); (4) a reduction in the length of the stricture (50% improvement)

Secondary Outcomes

Measure	Description	Time Frame
Evaluation of studying, in addition to biomarkers (CRP and fecal calprotectin),	Evaluation of evolution of biomarkers (CRP and fecal calprotectin) over the time by blood and stool samples analysis	Weeks 0, 4, 12, 24, 36 and 48

Eligibility Module

Eligibility Criteria

Inclusion Criteria:

Patient aged ≥ 18 years with Crohn's Disease diagnosed more than 6 months ago
Background treatment, for Crohn's Disease, stable for 4 months
Presence of stricture (whether de novo or anastomotic), meeting the radiological definition of stenosis, i.e. a combination of the following criteria: (1) localized luminal narrowing (reduction of luminal diameter by at least less than 50% compared to adjacent healthy bowel segment), (2) bowel wall thickening (25% increase in wall thickness compared to adjacent unaffected bowel) and pre-stenotic dilation (luminal diameter greater than 3 cm)
Presence of symptomatic stricture with abdominal pain after meals and limitations on the amount or type of food at screening
Presence of a stenosis accessible by ileo-colonoscopy, not passable (i.e. not allowing the passage of the adult ileo-colonoscope), of a length less than 5 cm, eligible for endoscopic dilation
Patient accepting the study protocol and having signed an informed consent
Patient capable of undergoing entero-MRI

Exclusion Criteria:

Patient liable for immediate surgery
Patient with intra-abdominal fistula or abscess
Patient with a stenosis not accessible to ileocolonoscopy
Patient presenting ≥ 2 strictures with impossibility of determining which stenosis is "dominant" and responsible for the symptoms (based on dilation in entero-MRI)
Patient with a stenosis longer than 5 cm
Patient with a contraindication to performing an entero-MRI or to the use of contrast product injection in entero-MRI (Gadolinium)
Pregnant woman or planning a pregnancy in the year
Patient with kidney insufficiency (with anuria, glomerular filtration rate < 30 ml/min or on dialysis), hepatic insufficiency (presence of fulminant hepatitis, cirrhosis with signs of portal hypertension, acute alcoholic hepatitis, esophageal varices, history of gastrointestinal bleeding following rupture of esophageal varices, hepatic encephalopathy, prolonged prothrombin time, ascites secondary to portal hypertension, bacterial or fungal liver abscess, biliary obstruction, chronic viral hepatitis with a total serum bilirubin level > 3 mg/dL)
Patient with documented human immunodeficiency virus (HIV) infection, active hepatitis B or C or tuberculosis
Patient having presented an opportunistic infection in the 6 months preceding inclusion or a serious infection in the previous 3 months
Patient who has developed a malignant tumor with a history of lymphoproliferative disease with the exception of: non-melanoma skin cancer, carcinoma in situ (e.g. skin, cervix, bladder, breast) and in remission for at least 3 years prior to screening, superficial bladder cancer, asymptomatic low-grade or localized curatively treated prostate cancer for which the "watch-and-wait" approach is the standard of care as well as any other cancer that has been in remission for ≥ 3 years prior to enrollment.

Name	Role	Phone	Extension	Email
Sophie Vieujean, MD	Contact	+32 4 323.72.56		s.vieujean@chuliege.be
Layla Boutaffala	Contact	+32 4 323.38.10		lboutaffala@chuliege.be