NCT05174273

Brief Summary

This study is a phase 2/3 open-label controlled trial (CT) in which adults with Major Depressive Disorder (MDD) and adults who have MDD plus comorbid Inflammatory Bowel Syndrome (IBS) will be assigned to either receive oral Fecal Microbiota Transplantation (FMT) or to continue with the treatment they are currently receiving in a Treatment As Usual (TAU) arm. An IBS alone group receiving TAU will be recruited as a clinical control group. The primary goals of this study are to determine effectiveness, safety and tolerability of oral FMT in adults with MDD and in MDD who have comorbid IBS. Additional goals are to characterize patterns and progressions of cognitive and neural correlates associated with MDD and with MDD + IBS and to determine if they improve with FMT. It is known that both, individuals with MDD and those with MDD and IBS show cognitive alterations as well as changes in neural structures, but this study is designed to see if those are changed with treatment response to FMT. Additionally, trial feasibility will be monitored via recruitment rate, study visits adherence and participant retention to inform future trial scalability."

Trial Health

75
On Track

Trial Health Score

Automated assessment based on enrollment pace, timeline, and geographic reach

Enrollment
133

participants targeted

Target at P50-P75 for phase_2 major-depressive-disorder

Timeline
5mo left

Started Apr 2022

Longer than P75 for phase_2 major-depressive-disorder

Geographic Reach
1 country

1 active site

Status
active not recruiting

Health score is calculated from publicly available data and should be used for screening purposes only.

Trial Relationships

Click on a node to explore related trials.

Study Timeline

Key milestones and dates

Study Progress90%
Apr 2022Oct 2026

First Submitted

Initial submission to the registry

December 13, 2021

Completed
17 days until next milestone

First Posted

Study publicly available on registry

December 30, 2021

Completed
3 months until next milestone

Study Start

First participant enrolled

April 6, 2022

Completed
2.5 years until next milestone

Primary Completion

Last participant's last visit for primary outcome

October 21, 2024

Completed
2 years until next milestone

Study Completion

Last participant's last visit for all outcomes

October 21, 2026

Expected
Last Updated

March 19, 2026

Status Verified

March 1, 2026

Enrollment Period

2.5 years

First QC Date

December 13, 2021

Last Update Submit

March 16, 2026

Conditions

Keywords

Major depressionIBSFecal microbiota TransplantationGutMicrobiomefMRI

Outcome Measures

Primary Outcomes (2)

  • The Montgomery-Ă…sberg Depression Rating Scale (MADRS)

    a 10-item questionnaire which psychiatrists use to measure the severity of depressive episodes in patients with mood disorders. This will be used to evaluate the effectiveness of adjunct oral FMT as compared to TAU with currently accepted approved therapy for MDD. The MADRS overall score ranges from 0 to 60. Each item yields a score of 0 to 6 and Higher MADRS score indicates more severe depression

    Baseline to week 13

  • IBS Symptom Severity Scale (IBS-SSS)

    The IBS-SSS is a 5-item questionnaire that is used to assess the severity and frequency of abdominal pain, severity of abdominal distention, dissatisfaction with bowel habits, and interference with quality of life over the past 10 days. Scores on the IBS-SSS can range from 0 to 500 with higher scores indicating more severe symptoms. Subjects can be categorized as having mild (75-175), moderate (175-300), or severe (\>300) IBS.

    Baseline to week 13

Secondary Outcomes (3)

  • Toronto Side Effect Scale (TSES)

    Baseline to Week 13

  • IBS specific Quality of Life (IBS-QoL)

    Baseline to Week 13

  • nuclear magnetic resonance (NMR) spectrometry

    Baseline to Week 13

Other Outcomes (2)

  • structural and functional neuroimaging

    Baseline to week 13

  • Number of participants recruited, and completed the study visits

    From Baseline to week 13

Study Arms (6)

Participants with a confirmed diagnosis of MDD receiving TAU

NO INTERVENTION

Eligible and consenting patients will be assigned 1:1 to receive either FMT from a healthy donor or continuing on their usual medication for MDD, i.e., treatment as usual (TAU). This arm will continue to receive their usual anti-depressant.

Participants with a confirmed diagnosis MDD who will receive FMT + TAU

ACTIVE COMPARATOR

Eligible and consenting patients will be assigned 1:1 to receive either FMT from a healthy donor or continuing on their usual medication for MDD, i.e., treatment as usual (TAU). This arm will be assigned to receive FMT provided by healthy donors.

Biological: Fecal Microbiota Transplantation

Participants with a confirmed diagnosis of MDD + IBS assigned to continue with TAU

NO INTERVENTION

Participants with a confirmed diagnosis of MDD + IBS assigned to receive FMT + TAU

ACTIVE COMPARATOR
Biological: Fecal Microbiota Transplantation

Participants with a confirmed diagnosis IBS only receiving TAU

NO INTERVENTION

Healthy Controls

NO INTERVENTION

Data from healthy comparison (HC) participants will be drawn from another completed research study. Healthy comparison participants who will best match the patient population enrolled in the current trial and who consented to data sharing will be selected.

Interventions

FMT is a technique in which intestinal microbiota are transferred from a healthy screened donor to a patient, with the goal being to introduce or restore a stable microbial community in the gut.

Also known as: FMT
Participants with a confirmed diagnosis MDD who will receive FMT + TAUParticipants with a confirmed diagnosis of MDD + IBS assigned to receive FMT + TAU

Eligibility Criteria

Age18 Years - 60 Years
Sexall
Healthy VolunteersNo
Age GroupsAdult (18-64)

You may qualify if:

  • Between 18-60 years of age:
  • Participants should be at least 18 years old and not older than 60 years at the day of screening
  • Have a primary diagnosis of MDD as assessed/confirmed by the M.I.N.I. International Neuropsychiatric Interview (MINI)
  • Have had a well-documented inadequate response to at least 2 approved antidepressants
  • A MADRS score of ≥ 19 at screening and visit 2a
  • Have a comorbid diagnosis of IBS. IBS patients can include any of the following: diarrhea predominant IBS (IBS-D), constipation predominant IBS (IBS-C), IBS with mixed bowel habits (IBS-M), or unclassified with IBS (IBS-U) as confirmed by the referring doctor using ROME III criteria
  • Moderate-to-severe IBS symptoms, as indicated by a score of ≥175 on the IBS Severity Scoring System (IBS-SSS)

You may not qualify if:

  • Participant meets Diagnostic and Statistical Manual of Mental Disorders (DSM-5)\[1\] Criteria for the following conditions according to the M.I.N.I:
  • Substance Use Disorder within the last 3 months. \*(Criteria should include Alcohol and non-alcohol substances except Cannabis)
  • Moderate or severe substance use disorder for Cannabis use the last 3 months
  • Active Anorexia Nervosa or Bulimia nervosa
  • Schizophrenia, schizoaffective or bipolar disorder
  • Active suicidality
  • Regular intake of non-steroidal anti-inflammatory drugs, antibiotics, or iron supplements for medical purposes in the three (3) months prior to study entry
  • Use of prebiotics or probiotics for medical purposes for more than two (2) weeks within the last three (3) months
  • Conditions causing immunosuppression
  • Women who are breastfeeding, pregnant or seeking to get pregnant during the course of this study. Not using an acceptable method of birth control (implants, injectable, combined oral contraceptives, IUDs, sexual abstinence or a vasectomized partner)

Contact the study team to confirm eligibility.

Sponsors & Collaborators

Study Sites (1)

University of Calgary, TRW building

Calgary, Alberta, T2N 4Z6, Canada

Location

Related Publications (84)

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MeSH Terms

Conditions

Depressive Disorder, MajorIrritable Bowel Syndrome

Interventions

Fecal Microbiota Transplantation

Condition Hierarchy (Ancestors)

Depressive DisorderMood DisordersMental DisordersColonic Diseases, FunctionalColonic DiseasesIntestinal DiseasesGastrointestinal DiseasesDigestive System Diseases

Intervention Hierarchy (Ancestors)

Biological TherapyTherapeutics

Study Officials

  • Valerie Taylor, MD, PhD

    University of Calgary

    PRINCIPAL INVESTIGATOR

Study Design

Study Type
interventional
Phase
phase 2
Allocation
NON RANDOMIZED
Masking
NONE
Purpose
OTHER
Intervention Model
PARALLEL
Model Details: This study is a phase 2/3 open-label controlled trial (CT) in which adults with MDD with and without IBS who are being treated with an approved antidepressant medication will be assigned to additionally receive either FMT or to continue with their current treatment in a treatment as usual (TAU) arm. An IBS alone group receiving TAU will be recruited as a clinical control group.
Sponsor Type
OTHER
Responsible Party
SPONSOR INVESTIGATOR
PI Title
Professor, Department Head, Psychiatry department

Study Record Dates

First Submitted

December 13, 2021

First Posted

December 30, 2021

Study Start

April 6, 2022

Primary Completion

October 21, 2024

Study Completion (Estimated)

October 21, 2026

Last Updated

March 19, 2026

Record last verified: 2026-03

Data Sharing

IPD Sharing
Will not share

Locations