Efficacy and Safety of Top-down Therapy in Pediatric Crohn's Disease

Efficacy and Safety of Infliximab as First-line Therapy in Pediatric Crohn's Disease: a Randomized, Controlled, Open-label Trial

Crohn's disease (CD) is an incurable debilitating disorder affecting an increasing number of children. The etiology remains elusive, but a genetically determined aberrant immune response against microbiota appears to be responsible. TNFα plays a pivotal role in the cytokine cascade of the inflammatory process and mediates multiple processes central to the pathogenesis of CD. The natural history of pediatric CD is characterized by recurrent flare-ups that severely impair patients growth, pubertal development and nutritional status. Epidemiological observations have shown that the course of CD, despite conventional treatment, inevitably progresses to the development of severe complications and surgery. Infliximab is the most widely used biological agent in moderate-to-severe pediatric CD. At present biologics are used after the failure of conventional drugs (step-up approach) and represent the peak of the CD therapeutic pyramid. The early use of biologics (top-down approach) has been demonstrated to be effective in adults with CD. The project aims at evaluating if a top-down approach may achieve mucosal healing before irreversible tissue damage present in late CD and thus alter the natural course of the disease, compared to the conventional approach. The study can also add information about the safety of infliximab used as first-line therapy and may add data on the benefit and costs of a reversal of the traditional therapeutic pyramid in pediatric CD, guiding the clinician in deciding in whom, when and how to introduce early aggressive treatment in daily practice.

Study Overview

• Status: Withdrawn
• Conditions: Pediatric Crohn's Disease
• Intervention / Treatment: Drug: Top-down; Drug: Step-up

Detailed Description

This is a single-center, open-label, randomized, prospective, controlled trial evaluating the efficacy and safety of infliximab (IFX) as first line therapy in children with moderate-to-severe CD. The estimated duration of the study is 36 months, including a recruitment phase of 12 months, a treatment phase of 12 months, composed by an induction phase of 8 weeks and a maintaining phase of 40 weeks, and a follow-up phase of 12 months. The study protocol is defined in accordance with Declaration of Helsinki and approved by the local ethical committee. Written informed consent will be obtained from all children's parents; children older than 12 years will sign a statement of assent. Children aged between 6 and 18 years with active CD confirmed by recognized clinical, radiological, endoscopic and histological criteria will be considered for the trial if they will satisfy the following criteria: 1. diagnosis of CD; 2. PCDAI>30; 3. duration of disease less than 1 year from the time of diagnosis (early CD). Exclusion criteria will be: any prior treatment with immunosuppressive agents (azathiorpine/6-mercaptopurine [AZA/6-MP], methotrexate, cyclosporine) or anti-TNFα, stenosing CD, pre-existing systemic disease, hepatic or renal dysfunction, systemic infection, suspected pregnancy, a history of active or past tuberculosis, or contraindication to corticosteroid (CS) therapy. Children who will have received any CS within 4 weeks before randomization will be also excluded. Patients who will have received 5-ASA will be eligible if the drug will be kept with a stable regimen for more than 4 weeks before the beginning of the study. Early CD will be arbitrarily defined as disease duration of <1 yr from the time of diagnosis. Eligible patients will be randomly allocated to receive a 8-week course of IFX plus AZA (top-down arm - TD) or CS plus AZA (step-up arm - SU). Randomization group assignments will be generated using a computer-generated randomization schedule by an independent statistician unaware of the patient's clinical history. Patients randomized on TD arm will receive an induction regimen of three consecutive i.v. infusions of IFX (Remicade, 5 mg/kg) at weeks 0, 2, and 6 plus AZA (2 mg/Kg per os/day). During maintaining phase, patients will receive subsequent infusions of IFX (5 mg/kg every 8 weeks), starting 8 weeks after the end of the induction phase (week 14). For each intravenous infusion, IFX will be reconstituted according to the instructions given on the package insert. Patients who will not respond to the induction regimen at week 8 will receive no further treatment with IFX. At 12 months AZA will be discontinued and patients on TD group will continue IFX monotherapy until the end of the study. Patients randomized on SU arm will receive methylprednisolone (1 mg/Kg/day per os. for 2 weeks then tapering of 5 mg/week then stop) plus AZA (2 mg/Kg/die per os/day). During the trial, other drugs will be not allowed, including immunosuppressive agents, other biological agents, other CS, such as budesonide. 5-ASA and sulfasalazine will be allowed, if begun before the enrollment. Disease recurrence will be treated with IFX in the TD group, and with repeated CS in the SU group. Clinical assessment will be performed through PCDAI at baseline, every 4 weeks after starting treatments during the induction, every 8 weeks during the maintaining phase (48 weeks), and every 12 weeks during the follow-up phase. The PCDAI (Pediatric Crohn's Disease Activity Index) is a multi-item score, based on recall of preceding week's symptoms, laboratory parameters (erythrocyte sedimentation rate, haematocrit and albumin), and physical examination score <=10 indicates inactive disease, 10-30 mild disease, and >30 moderate-to-severe disease. Clinical response to treatment require a 25-point decrease in PCDAI score. Clinical remission is defined as the absence of symptoms related to CD and a PCDAI <=10. From each patient blood samples to determine full blood count, erythrocyte sedimentation rate (ESR), C-reactive protein (CRP), serological values of albumin, urea, iron, creatinine, electrolytes, pancreatic and liver function tests will be taken before starting the randomization, every 4 weeks during the induction phase, and every 8 weeks during maintaining phase. All patients will undergo ileo-colonoscopy before, 8 weeks (end of the induction phase) and 48 weeks (end of the maintaining phase) after the beginning of the treatments. Endoscopy will be performed with a pediatric endoscope after deep sedation with propofol (induction dose: 1 to 2 mg/kg; repeated dose: 0.5 to 1 mg/kg). Endoscopies will be performed by experienced operators who will be unaware of the patient's clinical history, treatment program and clinical and bioumoral responses to the therapy. During ileo-colonoscopy, at least two biopsy samples will be taken from ileum and from each colonic segment for routine histological assessment. Biopsies will stained with haematoxylin and eosin and read by experienced gastrointestinal pathologists, unaware both of endoscopic features and clinical history. Mucosal healing will be evaluated through CDEIS (Crohn's Disease Endoscopic Index of Severity). CDEIS is based on the presence, at the level of terminal ileum and colon, of deep or superficial ulcerations, extension of ulcerated surface and presence of ulcerated or nonulcerated stenosis. Histological evaluation will be done by a scoring system previously validated used for ileal and colonic histology, combining both acute changes (infiltration of mononuclear and polymorphonuclear cells, erosions ulcerations) and chronic changes involving the mucosal architecture. The final histological colonic score will be obtained by the mean of the scores of each of the colonic segments.

• Study Type: Interventional
• Phase: Phase 4

Contacts and Locations

Study Locations

• Italy
  • Rome, Italy, 00161
    • Pediatric Gastroenterology and Liver Unit

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 6 years to 18 years (Child, Adult)
• Accepts Healthy Volunteers: No
• Genders Eligible for Study: All

Description

Inclusion Criteria

1. diagnosis of CD,
2. PCDAI>30,
3. duration of disease less than 1 yr from the time of diagnosis (early CD).

Exclusion Criteria:

1. any prior treatment with immunosuppressive agents (AZA/6-MP, methotrexate, cyclosporine) or anti-TNFα,
2. stenosing CD,
3. pre-existing systemic disease,
4. hepatic or renal dysfunction,
5. systemic infection,
6. suspected pregnancy,
7. history of active or past tuberculosis,
8. contraindication to steroid therapy

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Treatment
• Allocation: Randomized
• Interventional Model: Parallel Assignment
• Masking: None (Open Label)

Number of Arms

2

Arms and Interventions

Participant Group / Arm	Intervention / Treatment
Experimental: Top-down; patients randomized on top-down arm will receive an induction regimen of three consecutive i.v. infusions of infliximab (Remicade, 5 mg/kg) at weeks 0, 2, and 6 plus azathioprine (2 mg/Kg per os/day). During maintaining phase, patients will receive subsequent infusions of infliximab (5 mg/kg every 8 weeks), starting 8 weeks after the end of the induction phase (week 14). At 12 motnhs patients will stop azathioprine and continue infliximab (5 mg/kg every 8 weeks)	Drug: Top-down; Patients randomized to top-down arm will receive an induction regimen of three consecutive i.v. infusions of infliximab (Remicade, 5 mg/kg) at weeks 0, 2, and 6 plus AZA (2 mg/Kg per os/day). Patients who will not respond to the induction regimen at week 8 will receive no further treatment with infliximab. Disease recurrences will be treated with infliximab (reduction of the interval between two doses). At 12 months pazients will discontinue azathioprine and continue infliximab (5mg/kg every 8 weeks). During the trial, other drugs will be not allowed, including immunosuppressive agents, other biological agents or steroids.; Other Names: Remicade; Imuran
Active Comparator: Step-up; Patients randomized on Step-up arm will receive methylprednisolone (1-2 mg/Kg/day per os. for 2 weeks then tapering of 5 mg/week then stop) plus azathioprine (2 mg/Kg/die per os/day). Disease recurrences under azathioprine will be treated with steroid courses (methylprednisolone 1-2 mg/Kg/day per os. for 2 weeks then tapering of 5 mg/week then stop).	Drug: Step-up; Patients randomized on Step-up arm will receive methylprednisolone (1 mg/Kg/day per os. for 2 weeks then tapering of 5 mg/week then stop) plus azathioprine (2 mg/Kg/die per os/day).Disease recurrences under azathioprine will be treated with steroid courses (methylprednisolone 1-2 mg/Kg/day per os. for 2 weeks then tapering of 5 mg/week then stop). During the trial, other drugs will be not allowed, including immunosuppressive agents, other biological agents or steroids.; Other Names: Medrol; Imuran; Urbason

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Clinical response or clinical remission as determined by PCDAI in top-down vs. step-up group	The proportion of patients with clinical remission or clinical response as determined by the Pediatric Crohn's Disease Activity Index (PCDAI)in the top-down compared to the step-up group. Clinical remission is defined as a PCDAI<10. Clinical response requires a 25-point decrease in PCDAI when compared to baseline.	6, 12, 18, 24, 36 months
Rate of mucosal healing in top-down vs. step-up group	The proportion of patients with intestinal mucosal healing as determined by the Crohn's Disease Endoscopic Index of Severity (CDEIS). Healing of intestinal inflammation is defined as a decrease in both endoscopic (CDEIS) and histological scores for >= 50 % when compared to baseline values.	6, 12, 24, 36 months

Secondary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Rate of adverse events in top-down vs. step-up group	The proportion of patients with adverse drug reaction and side effects attributable to therapy	6,12,18,24,36 months
Hospitalization and surgery	The number of hospitalizations and surgical procedures in Top-down and step-up group	6,12,24, 36 months
Growth	The pattern of growth in terms of Z-scores in top-down and step-up group	6,12,24,36 months

Collaborators and Investigators

• Sponsor: University of Roma La Sapienza
• Investigators: Principal Investigator: Marina Aloi, Investigator, University of Roma La Sapienza

Study record dates

Study Major Dates

• Study Start: December 1, 2012
• Primary Completion (Anticipated): January 1, 2014
• Study Completion (Anticipated): December 1, 2015

Study Registration Dates

• First Submitted: December 12, 2012
• First Submitted That Met QC Criteria: December 14, 2012
• First Posted (Estimate): December 19, 2012

Study Record Updates

• Last Update Posted (Estimate): March 6, 2013
• Last Update Submitted That Met QC Criteria: March 5, 2013
• Last Verified: March 1, 2013

More Information

Terms related to this study

• Keywords: Biologics; Immunomodulators; Pediatric Crohn's disease; Top-down; step-up
• Additional Relevant MeSH Terms: Digestive System Diseases; Gastrointestinal Diseases; Gastroenteritis; Intestinal Diseases; Inflammatory Bowel Diseases; Crohn Disease; Physiological Effects of Drugs; Molecular Mechanisms of Pharmacological Action; Antirheumatic Agents; Antimetabolites, Antineoplastic; Antimetabolites; Antineoplastic Agents; Immunosuppressive Agents; Immunologic Factors; Azathioprine
• Other Study ID Numbers: 2473