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ICON-2: FMT and Bezlotoxumab Compared to FMT and Placebo for Patients With IBD and CDI

A Randomized Controlled Trial to Compare the Effectiveness of Fecal Microbiota Transplantation (FMT) in Combination With Bezlotoxumab Compared to FMT and Placebo for the Prevention of CDI Recurrence in Patients With Inflammatory Bowel Disease and Recurrent Clostridium Difficile Infection

Status
Completed
Phases
Phase 2
Study type
Interventional
Source
ClinicalTrials.gov
Registry ID
NCT03829475
Acronym
ICON-2
Enrollment
61
Registered
2019-02-04
Start date
2020-01-01
Completion date
2025-06-01
Last updated
2025-12-09

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Inflammatory Bowel Diseases, Clostridium Difficile Infection

Keywords

Crohn's DIsease, Ulcerative Colitis

Brief summary

This is a randomized controlled trial to assess the clinical and microbiological impacts of FMT in combination with Bezlotoxumab (bezlo) compared to FMT in combination with placebo in patients with both inflammatory bowel disease (IBD) a and clostridium difficile infection (CDI). The investigators will prospectively enroll up to 150 IBD-CDI patients from 4 tertiary care FMT referral centers. Patients will be randomized 1:1 to either receive FMT in combination with Bezlo of FMT and a placebo infusion. Donor stool from healthy donors will be obtained from OpenBiome. OpenBiome is a nonprofit 501(c)(3) organization that provides hospitals with screened, filtered, and frozen material ready for clinical use. Patients will be enrolled and followed prospectively for 3 months post therapy. Stool and blood samples as well as clinical data will be collected at baseline, week 1, 8 and 12.

Interventions

This is a a fully human monoclonal antibody that binds to C. difficile toxin B, and is indicated to prevent recurrence of CDI in adults at risk for recurrent CDI (rCDI).

DRUGPlacebo

placebo is an infusion of normal saline.

DRUGFecal Microbiota Transplantation

FMT is an infusion of prescreened donor stool that will be administered via colonoscopy

Sponsors

Brigham and Women's Hospital
Lead SponsorOTHER

Study design

Allocation
RANDOMIZED
Intervention model
PARALLEL
Primary purpose
TREATMENT
Masking
DOUBLE (Subject, Investigator)

Eligibility

Sex/Gender
ALL
Age
18 Years to No maximum
Healthy volunteers
No

Inclusion criteria

* Adults age 18 or greater * History of ≥ 2 episodes of recurrent CDI. CDI is defined as the presence of diarrhea ( Bristol 6 or 7 for 48 hours and a confirmatory test for CDI). Preferred testing will be a two-step method using GDH/EIA toxin, though PCR will be accepted based on hospital availability with confirmation of the most recent episode occurring within the prior 3 months * Confirmed diagnosis of IBD (ulcerative colitis, Crohn's disease or indeterminate colitis) * Undergoing FMT via colonoscopy for CDI as part of standard medical care

Exclusion criteria

* Unable or unwilling to undergo a colonoscopy * Inpatient status, though patients can be screened while inpatients, the must be outpatient for the planned colonoscopy. * Anticipated immediate or upcoming surgery within 30 days * Need for continued non-anti-CDI antibiotic therapy * History of total proctocolectomy * Female patients who are pregnant or breastfeeding or plan to become pregnant in the next 6 months. * Patients who are unable to give informed consent * Participation in a clinical trial in the preceding 30 days or simultaneously during this trial * Severe food allergy (anaphylaxis or anaphylactoid-like reaction) * Life expectancy \< 6 months * Unable to adhere to protocol requirements * Patient who have received an FMT in the past year * Any condition that the physician investigators deems unsafe, including other conditions or medications that the investigator determines that it will put the subject at greater risk from FMT * Patient who is diagnosed with NYHA class 3 or 4 Heart Failure * Lab value of WBC \<3.0 x 103/mm3 , Platelets \<100 x 103/mm3 , ALT or AST \> 1.5 x institutional ULN * EBV or CMV negative if a patient is severely immunosuppressed ( defined as 3 or more immunosuppressing agents)

Design outcomes

Primary

MeasureTime frameDescription
Number of Participants With Clostridium Difficile Recurrence8 weekspositive test for CDI by EIA toxin

Countries

United States

Participant flow

Participants by arm

ArmCount
FMT + Bezlo
Participants received an FMT via colonoscopy (250ml) as well as a single IV infusion of bezlotoxumab (10mg/kg) that took place over 60 minutes. Bezlotoxumab: This is a a fully human monoclonal antibody that binds to C. difficile toxin B, and is indicated to prevent recurrence of CDI in adults at risk for recurrent CDI (rCDI). Fecal Microbiota Transplantation: FMT is an infusion of prescreened donor stool that will be administered via colonoscopy
30
FMT + Placebo
Participants received a single FMT via colonoscopy (250ml) and a placebo (saline) infusion (250cc) over 60 minutes. Placebo: placebo is an infusion of normal saline. Fecal Microbiota Transplantation: FMT is an infusion of prescreened donor stool that will be administered via colonoscopy
31
Total61

Baseline characteristics

CharacteristicFMT + PlaceboTotalFMT + Bezlo
Age, Continuous34 years38 years38.5 years
Baseline Bowel Movement4 bowel movements5 bowel movements5 bowel movements
Baseline Bristol Score5 units on a scale5 units on a scale5 units on a scale
Baseline Calprotectin241 mcg/g635 mcg/g930.5 mcg/g
Baseline Harvey Bradshaw Index6.5 units on a scale6.5 units on a scale7 units on a scale
Baseline Partial Mayo2 units on a scale3 units on a scale3.5 units on a scale
Race (NIH/OMB)
American Indian or Alaska Native
0 Participants0 Participants0 Participants
Race (NIH/OMB)
Asian
1 Participants1 Participants0 Participants
Race (NIH/OMB)
Black or African American
1 Participants3 Participants2 Participants
Race (NIH/OMB)
More than one race
0 Participants0 Participants0 Participants
Race (NIH/OMB)
Native Hawaiian or Other Pacific Islander
0 Participants0 Participants0 Participants
Race (NIH/OMB)
Unknown or Not Reported
2 Participants3 Participants1 Participants
Race (NIH/OMB)
White
27 Participants54 Participants27 Participants
Sex: Female, Male
Female
14 Participants28 Participants14 Participants
Sex: Female, Male
Male
17 Participants33 Participants16 Participants

Adverse events

Event typeEG000
affected / at risk
EG001
affected / at risk
deaths
Total, all-cause mortality
0 / 300 / 31
other
Total, other adverse events
16 / 3015 / 31
serious
Total, serious adverse events
5 / 304 / 31

Outcome results

Primary

Number of Participants With Clostridium Difficile Recurrence

positive test for CDI by EIA toxin

Time frame: 8 weeks

ArmMeasureValue (COUNT_OF_PARTICIPANTS)
FMT + BezloNumber of Participants With Clostridium Difficile Recurrence4 Participants
FMT + PlaceboNumber of Participants With Clostridium Difficile Recurrence1 Participants
p-value: 0.15Wilcoxon (Mann-Whitney)

Source: ClinicalTrials.gov · Data processed: Feb 4, 2026