Pilot Trial of Colchicine for Graft Failure in CABG (CoCAB-Pilot)

August 30, 2026 updated by: Zhu yunpeng, Ruijin Hospital

A Single Center Pilot Trial of Preliminary Effect of Colchicine on Graft Failure in Patients Underwent CABG

This is a single-center, prospective, randomized, open-label, assessor-blinded, blank-controlled exploratory (pilot) trial evaluating the feasibility of oral colchicine after coronary artery bypass grafting (CABG). Graft failure and cardiovascular events remain common after CABG, and the anti-inflammatory drug colchicine has shown cardiovascular benefit in chronic coronary disease but has not been adequately studied after CABG.

Approximately 100 adults (aged 18 years and older, any sex) who have undergone first-time isolated CABG, are clinically stable within 3 days after surgery, and are able to take oral medications will be enrolled. Participants will be randomized 1:1 to receive oral colchicine 0.5 mg once daily, initiated within 3 days after surgery and continued for up to 1 year, or no colchicine (blank control).

The primary objective is to assess the feasibility of oral colchicine after CABG, including participant recruitment rate, informed consent rate, treatment adherence, 1-year follow-up completion rate (coronary CT angiography review rate), and safety acceptability, to provide feasibility evidence and sample size estimation parameters for a future multicenter confirmatory randomized controlled trial. Secondary and exploratory objectives include preliminary comparisons of 1-year graft failure (Fitzgibbon B/S/O grades), major adverse cardiovascular events (MACE-5), serious complications of interest, new-onset perioperative atrial fibrillation/flutter, changes in high-sensitivity C-reactive protein and neutrophil-to-lymphocyte ratio, and the incidence of diarrhea and serious infection.

Each participant will be followed for 1 year after surgery.

Study Overview

Status

Status

Indicates the current recruitment status or the expanded access status.
Recruiting

Conditions

Conditions

The disease, disorder, syndrome, illness, or injury that is being studied. On ClinicalTrials.gov, conditions may also include other health-related issues, such as lifespan, quality of life, and health risks.

Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.

Study Type

Study Type

Describes the nature of a clinical study. Study types include interventional studies (also called clinical trials), observational studies (including patient registries), and expanded access.
Interventional

Enrollment (Estimated)

Enrollment

The number of participants in a clinical study. The "anticipated" enrollment is the target number of participants that the researchers need for the study.
100

Phase

Phase

The stage of a clinical trial studying a drug or biological product, based on definitions developed by the U.S. Food and Drug Administration (FDA). The phase is based on the study's objective, the number of participants, and other characteristics. There are five phases: Early Phase 1 (formerly listed as Phase 0), Phase 1, Phase 2, Phase 3, and Phase 4. Not Applicable is used to describe trials without FDA-defined phases, including trials of devices or behavioral interventions.
  • Phase 4

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Contact

Study Contact

The name and contact information for the person who can answer enrollment questions for a clinical study. Each location where the study is being conducted may also have a specific contact, who may be better able to answer those questions.

Study Locations

  • China
      • Shanghai, China
        • Recruiting
        • Ruijin Hospital Shanghai Jiao Tong University School of Medicine
        • Contact:

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Eligibility Criteria

The key requirements that people who want to participate in a clinical study must meet or the characteristics they must have. Eligibility criteria consist of both inclusion criteria (which are required for a person to participate in the study) and exclusion criteria (which prevent a person from participating). Types of eligibility criteria include whether a study accepts healthy volunteers, has age or age group requirements, or is limited by sex.

Ages Eligible for Study

  • Adult
  • Older Adult

Accepts Healthy Volunteers

No

Description

Inclusion Criteria:

  • Age≥18 years old，
  • Any sex，
  • Signed informed consent，
  • Within 3 days after a successful isolated CABG

Exclusion Criteria:

  • Allergy,
  • Hematopoietic dysfunction,
  • Moderate to severe hepatic dysfunction,
  • Moderate to severe renal dysfunction.

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Treatment
  • Allocation: Randomized
  • Interventional Model: Parallel Assignment
  • Masking: Single

Arms and Interventions

Participant Group / Arm

Participant Group / Arm

A group or subgroup of participants in a clinical trial that receives a specific intervention/treatment, or no intervention, according to the trial's protocol.
Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.
Experimental: Colchicine
Oral Colchicine 0.5mg qd for 1 year
Drug: Colchicine
Oral Colchicine 0.5mg qd for 1 year
No Intervention: Blank control
No Oral Colchicine therapy

What is the study measuring?

Primary Outcome Measures

Primary Outcome Measures

In a clinical study's protocol, the planned outcome measure that is the most important for evaluating the effect of an intervention/treatment. Most clinical studies have one primary outcome measure, but some have more than one.
Outcome Measure
Measure Description
Time Frame
Participant recruitment rate
Time Frame: From start of enrollment through completion of enrollment (approximately 1 year)
Average number of participants randomized per month, from start of enrollment to completion of enrollment. Go/no-go (traffic-light) thresholds: Green ≥12 per month; Amber 7-11 per month; Red <7 per month.
From start of enrollment through completion of enrollment (approximately 1 year)
Informed consent success rate
Time Frame: From screening through completion of enrollment (approximately 1 year)
Number of participants who signed informed consent divided by number screened. Go/no-go (traffic-light) thresholds: Green ≥60% and ≤85%; Amber ≥45%and<60%; Red <45% or >85%.
From screening through completion of enrollment (approximately 1 year)
Treatment adherence rate
Time Frame: From randomization through 1 year post-CABG (end of study follow-up)
Proportion of participants who are adherent to the assigned treatment (number of adherent participants divided by total number of participants). Go/no-go (traffic-light) thresholds: Green ≥95%; Amber ≥85%and<95%; Red <85%.
From randomization through 1 year post-CABG (end of study follow-up)
1-year CCTA follow-up completion rate
Time Frame: From randomization through 1 year post-CABG (end of study follow-up)
Proportion of participants who complete coronary CT angiography (CCTA) graft assessment at 1 year after CABG surgery. Go/no-go (traffic-light) thresholds: Green ≥90%; Amber ≥80% and <90%; Red <80%.
From randomization through 1 year post-CABG (end of study follow-up)
Safety acceptability
Time Frame: From randomization through 1 year post-CABG (end of study follow-up)
Incidence of colchicine-related serious adverse events (SAEs). Go/no-go (traffic-light) thresholds: Green ≤4%; Amber >4% and ≤8%; Red >8%.
From randomization through 1 year post-CABG (end of study follow-up)

Secondary Outcome Measures

Secondary Outcome Measures

In a clinical study's protocol, a planned outcome measure that is not as important as the primary outcome measure for evaluating the effect of an intervention but is still of interest. Most clinical studies have more than one secondary outcome measure.
Outcome Measure
Measure Description
Time Frame
The time to first 5-point Major Adverse Cardiovascular Event (MACE-5)
Time Frame: within 1 year post-CABG
MACE-5 is a composite of all-cause death, myocardial infarction, stroke, unplanned revascularization, and rehospitalization due to unstable angina.
within 1 year post-CABG
1-year Graft failure rate
Time Frame: at 1 year post-CABG
Incidence of graft failure at 1 year after CABG, assessed by coronary CT angiography (CCTA). Graft failure is defined as modified Fitzgibbon Grade B (stenosis ≥50%), Grade S (string sign), or Grade O (occlusion).
at 1 year post-CABG
30-days incidence of serious complications
Time Frame: Within 30 days after surgery
Incidence of pre-specified serious complications within 30 days after surgery, including: cardiac arrest (requiring cardiopulmonary resuscitation); reoperation (bleeding-related or other causes); incision complications (superficial or deep); pulmonary infection (requiring prolonged or escalated antibiotic therapy); respiratory failure (requiring re-intubation or tracheostomy); permanent pacemaker implantation; major gastrointestinal bleeding; and new-onset renal failure (requiring dialysis).
Within 30 days after surgery
1-week new perioperative atrial fibrillationat (PAF) rate
Time Frame: within 7 days post-CABG
PAF will be detected through continuous electrocardiographic monitoring.
within 7 days post-CABG
Change in high-sensitivity C-reactive protein (hs-CRP) and neutrophil-to-lymphocyte ratio (NLR)
Time Frame: Baseline through 1 year post-CABG
Changes in hs-CRP and NLR from baseline at 7 days, 30 days, 6 months, and 12 months after surgery, reported as absolute change and percentage change from baseline.
Baseline through 1 year post-CABG
Incidence of diarrhea and serious infection
Time Frame: Within 1 year post-CABG
Incidence of diarrhea (drug-related change in bowel habits, such as increased frequency or loose stools) and serious infection (infection confirmed by microbiological, pathological, and/or imaging examination and requiring intravenous antibiotics) within 1 year after surgery.
Within 1 year post-CABG

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Sponsor

The organization or person who initiates the study and who has authority and control over the study.
Ruijin Hospital

Investigators

Investigators

A researcher involved in a clinical study. Related terms include site principal investigator, site sub-investigator, study chair, study director, and study principal investigator.
  • Study Chair: Qiang Zhao, MD, Ruijin Hospital Shanghai Jiao Tong University School of Medicine, Shanghai, China
  • Principal Investigator: Yunpeng Zhu, MD, Ruijin Hospital Shanghai Jiao Tong University School of Medicine, Shanghai, China

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Actual)

Study Start

The actual date on which the first participant was enrolled in a clinical study. The "anticipated" study start date is the date that the researchers think will be the study start date.
December 29, 2025

Primary Completion (Estimated)

Primary Completion

The date on which the last participant in a clinical study was examined or received an intervention to collect final data for the primary outcome measure. Whether the clinical study ended according to the protocol or was terminated does not affect this date. For clinical studies with more than one primary outcome measure with different completion dates, this term refers to the date on which data collection is completed for all the primary outcome measures. The "anticipated" primary completion date is the date that the researchers think will be the primary completion date for the study.
December 1, 2027

Study Completion (Estimated)

Study Completion

The date on which the last participant in a clinical study was examined or received an intervention/treatment to collect final data for the primary outcome measures, secondary outcome measures, and adverse events (that is, the last participant's last visit). The "anticipated" study completion date is the date that the researchers think will be the study completion date.
December 1, 2028

Study Registration Dates

First Submitted

First Submitted

The date on which the study sponsor or investigator first submitted a study record to ClinicalTrials.gov. There is typically a delay of a few days between the first submitted date and the record's availability on ClinicalTrials.gov (the first posted date).
January 26, 2025

First Submitted That Met QC Criteria

First Submitted That Met QC Criteria

The date on which the study sponsor or investigator first submits a study record that is consistent with National Library of Medicine (NLM) quality control (QC) review criteria. The sponsor or investigator may need to revise and submit a study record one or more times before NLM's QC review criteria are met. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
January 30, 2025

First Posted (Actual)

First Posted

The date on which the study record was first available on ClinicalTrials.gov after National Library of Medicine (NLM) quality control (QC) review has concluded. There is typically a delay of a few days between the date the study sponsor or investigator submitted the study record and the first posted date.
January 31, 2025

Study Record Updates

Last Update Posted (Actual)

Last Update Posted

The most recent date on which changes to a study record were made available on ClinicalTrials.gov. There may be a delay between when the changes were submitted to ClinicalTrials.gov by the study's sponsor or investigator (the last update submitted date) and the last update posted date.
September 2, 2026

Last Update Submitted That Met QC Criteria

Last Update Submitted That Met QC Criteria

The most recent date on which the study sponsor or investigator submitted changes to a study record that are consistent with National Library of Medicine (NLM) quality control (QC) review criteria. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
August 30, 2026

Last Verified

Last Verified

The most recent date on which the study sponsor or investigator confirmed the information about a clinical study on ClinicalTrials.gov as accurate and current. If a study with a recruitment status of recruiting; not yet recruiting; or active, not recruiting has not been confirmed within the past 2 years, the study's recruitment status is shown as unknown.
December 1, 2025

More Information

Terms related to this study

Additional Relevant MeSH Terms

Other Study ID Numbers

Other Study ID Numbers

Identifiers or ID numbers other than the NCT number that are assigned to a clinical study by the study's sponsor, funders, or others. These numbers may include unique identifiers from other trial registries and National Institutes of Health grant numbers.
  • KY-2025-777

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

YES

IPD Sharing Supporting Information Type

  • STUDY_PROTOCOL
  • SAP
  • CSR

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

Studies a U.S. FDA-regulated device product

No

product manufactured in and exported from the U.S.

No

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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