Harmonizing Optimal Strategy for Treatment of Coronary Artery Stenosis- CloPidogREl for Primary preVENTION (HOST-PREVENTION)

December 28, 2025 updated by: Hyo-Soo Kim, Seoul National University Hospital

Efficacy and Safety of Clopidogrel for Primary Prevention in Patients With Subclinical Coronary Atherosclerosis Identified on Imaging

The investigators will evaluate the efficacy and safety of clopidogrel for primary prevention in patients diagnosed with coronary atherosclerosis on imaging that did not require revascularization therapy.

The trial will test the hypothesis that clopidogrel is beneficial in preventing major adverse cardiovascular and cerebrovascular events (MACCE) in patients with subclinical coronary atherosclerosis identified on imaging.

Study Overview

Detailed Description

Coronary artery disease (CAD) is the most prevalent and lethal disease worldwide. Even though various studies have been performed regarding the prevention or treatment of CAD and its related cardiovascular events, the prevalence of CAD and the incidence of cardiovascular events are increasing.

Antiplatelet agents are among the most widely used drugs for preventing cardiovascular events. The efficacy of antiplatelet agents has been extensively proven in secondary prevention for cardiovascular events in CAD patients, and their use has been recommended in current guidelines. However, there is still controversy surrounding the prescription of antiplatelet agents for the primary prevention of cardiovascular events in CAD patients due to their unknown clear efficacy and risk of bleeding complications.

Recent studies reported the limited efficacy of aspirin in old patients, diabetes patients, or patients with cardiovascular events risks. However, the efficacy or safety of antiplatelet therapy in patients with subclinical coronary atherosclerosis has not been thoroughly investigated. These patients are at higher risk of cardiac death or myocardial infarction compared to patients without coronary atherosclerosis.

In this regard, the investigators will evaluate the efficacy and safety of clopidogrel for primary prevention in patients diagnosed with coronary atherosclerosis on imaging that did not require revascularization therapy.

Study Type

Interventional

Enrollment (Estimated)

11086

Phase

  • 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 Locations

      • Andong, South Korea
        • Recruiting
        • Andong Hospital
        • Contact:
      • Busan, South Korea
        • Recruiting
        • Pusan National University Hospital
        • Contact:
      • Busan, South Korea
        • Recruiting
        • Dong-A University Hospital
        • Contact:
      • Busan, South Korea
        • Recruiting
        • Kosin University Gospel Hospital
        • Contact:
      • Busan, South Korea
        • Recruiting
        • Inje University Busan Paik Hospital
        • Contact:
      • Changwon, South Korea
        • Recruiting
        • Gyeongsang National University Changwon Hospital
        • Contact:
      • Cheonan, South Korea
        • Recruiting
        • Soonchunhyang University Cheonan Hospital
        • Contact:
      • Cheongju-si, South Korea
        • Recruiting
        • Chungbuk National University Hospital
        • Contact:
      • Chuncheon, South Korea
        • Recruiting
        • Kangwon National University Hospital
        • Contact:
      • Chuncheon, South Korea
        • Recruiting
        • Hallym University Chuncheon Sacred Heart Hospital
        • Contact:
      • Daegu, South Korea
        • Recruiting
        • Keimyung University Dongsan Hospital
        • Contact:
      • Daegu, South Korea
        • Recruiting
        • Yeungnam University Medical Center
        • Contact:
      • Daejeon, South Korea
        • Recruiting
        • Chungnam National University Hospital
        • Contact:
      • Daejeon, South Korea
        • Recruiting
        • Eulji University Hospital, Daejeon
        • Contact:
      • Gangneung, South Korea
        • Recruiting
        • GangNeung Asan Hospital
        • Contact:
      • Gwangju, South Korea
        • Recruiting
        • Chonnam National University Hospital
        • Contact:
      • Gwangju, South Korea
        • Recruiting
        • Kwangju Christian hospital
        • Contact:
      • Gyeonggi-do, South Korea
        • Recruiting
        • Hallym University Dongtan Sacred Heart Hospital
        • Contact:
      • Gyeonggi-do, South Korea
        • Recruiting
        • Chung-Ang University Gwangmyeong Hospital
        • Contact:
      • Gyeonggi-do, South Korea
        • Recruiting
        • Eulji University Hospital, Uijeongbu
        • Contact:
      • Gyeonggi-do, South Korea
        • Recruiting
        • Hallym University Sacred Heart Hospital
        • Contact:
      • Gyeonggi-do, South Korea
        • Recruiting
        • Inje University Ilsan Paik Hospital
        • Contact:
          • Joon-Hyung Doh, MD,PhD
          • Phone Number: +82-10-9610-1570
          • Email: djh95@paik.ac
      • Gyeonggi-do, South Korea
        • Recruiting
        • Myongji Hospital
        • Contact:
      • Gyeonggi-do, South Korea
        • Recruiting
        • National Health Insurance Service Ilsan Hospital
        • Contact:
      • Gyeonggi-do, South Korea
        • Recruiting
        • Sejong General Hospital, Bucheon
        • Contact:
      • Gyeonggi-do, South Korea
        • Recruiting
        • Soonchunhyang University Bucheon Hospital
        • Contact:
      • Gyeonggi-do, South Korea
        • Recruiting
        • Yonsei University Yongin Severance Hospital
        • Contact:
      • Hwasun, South Korea
        • Recruiting
        • Chonnam National University Hwasun Hospital
        • Contact:
          • Ju Han kim, MD,PhD
          • Phone Number: +82-10-3629-0220
          • Email: kim@zuhan.com
      • Incheon, South Korea
        • Recruiting
        • Gachon University Gil Medical Center
        • Contact:
      • Incheon, South Korea
        • Recruiting
        • Catholic Kwandong University International St. Mary's Hospital
        • Contact:
      • Jeju City, South Korea
        • Recruiting
        • Jeju National University Hospital
        • Contact:
      • Jeonju, South Korea
        • Recruiting
        • Jesus Hospital, Jeonju
        • Contact:
      • Jinju, South Korea
        • Recruiting
        • Gyeongsang National University Hospital
        • Contact:
      • Pohang, South Korea
        • Recruiting
        • Pohang Stroke And Spine Hospital
        • Contact:
      • Sejong, South Korea
        • Recruiting
        • Chungnam National University Sejong Hospital
        • Contact:
      • Seoul, South Korea
        • Recruiting
        • Chung-Ang University Hospital
        • Contact:
      • Seoul, South Korea
        • Recruiting
        • Samsung Medical Center
        • Contact:
      • Seoul, South Korea
        • Recruiting
        • Korea University Guro Hospital
        • Contact:
      • Seoul, South Korea
        • Recruiting
        • Korea University Anam Hospital
        • Contact:
      • Seoul, South Korea
        • Recruiting
        • Kangbuk Samsung Hospital
        • Contact:
      • Seoul, South Korea
        • Recruiting
        • Soonchunhyang University Seoul Hospital
        • Contact:
      • Seoul, South Korea
        • Recruiting
        • Ewha Womans University Seoul Hospital
        • Contact:
      • Seoul, South Korea
        • Recruiting
        • Kyung Hee University Hospital
        • Contact:
      • Seoul, South Korea
        • Recruiting
        • Hanyang University Hospital
        • Contact:
      • Seoul, South Korea
        • Recruiting
        • Hallym University Kangdong Sacred Heart Hospital
        • Contact:
      • Seoul, South Korea
        • Recruiting
        • Hallym University Kangnam Sacred Heart Hospital
        • Contact:
      • Seoul, South Korea
        • Recruiting
        • Inje University Sanggye Paik Hospital
        • Contact:
      • Seoul, South Korea
        • Recruiting
        • Seoul Medical Center
        • Contact:
      • Seoul, South Korea
        • Recruiting
        • Seoul Metropolitan Government - Seoul National University Boramae Medical Center
        • Contact:
      • Seoul, South Korea
        • Recruiting
        • Veterans Health Service Medical Center
        • Contact:
      • Seoul, South Korea
        • Recruiting
        • Yonsei University Gangnam Severance Hospital
        • Contact:
          • Byoung Kwon Lee, MD,PhD
          • Phone Number: +82-10-2721-8813
          • Email: CARDIOBK@yuhs.ac
      • Ulsan, South Korea
        • Recruiting
        • Ulsan University Hospital
        • Contact:
      • Wŏnju, South Korea
        • Recruiting
        • Yonsei University Wonju Severance Christian Hospital
        • Contact:
    • Other
      • Seoul, Other, South Korea, 03080
        • Recruiting
        • Seoul National University Hospital
        • 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

Ages Eligible for Study

  • Adult
  • Older Adult

Accepts Healthy Volunteers

No

Description

Inclusion Criteria:

  • Male or female aged ≥40 years
  • Patients with subclinical coronary atherosclerosis identified from coronary CT angiography or coronary angiography within 2 years without clinical events after an imaging study
  • Without significant coronary artery stenosis (Diameter stenosis >50%), which needs revascularization
  • Agreement to give written informed consent

Exclusion Criteria:

  • A history of a diagnosed cardiovascular or cerebrovascular disease (Type1 myocardial infarction, heart failure, peripheral artery disease, stroke, transient ischemic attack, carotid artery stenosis>50%, carotid artery intervention)
  • A history of coronary artery intervention or coronary artery bypass graft surgery, which needs chronic maintenance of antiplatelet therapy
  • Absolute contraindication or allergy to clopidogrel
  • Patients receiving anticoagulants for other comorbidities
  • A history of Bleeding diathesis, known coagulopathy, or major bleeding, BARC class ≥3, resulting in the stop of antiplatelet agents
  • Planned surgery or intervention which needs to stop antiplatelet agents ≥1 month
  • Presence of non-cardiac comorbidity with life expectancy ≤ 5 years at randomization
  • Females with pregnancy or breast-feeding
  • Patients who are thought to be inappropriate for the trial based on physicians' decision

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: Prevention
  • Allocation: Randomized
  • Interventional Model: Parallel Assignment
  • Masking: None (Open Label)

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
Experimental: Clopidogrel treatment group
Patients assigned to the clopidogrel treatment group will maintain clopidogrel 75mg once a day for at least 5 years.
Patients assigned to the clopidogrel treatment group will maintain clopidogrel 75mg once a day for at least 5 years.
Active Comparator: No antiplatelet or anticoagulant group
Patients assigned to the no antiplatelet or anticoagulant group will not prescribe antithrombotics for at least 5 years. However, when there is a medical need for antithrombotic therapy during the follow-up, the prescription of antithrombotics is permitted with reporting to the research board.
Patients assigned to the no antiplatelet or anticoagulant group will not prescribe antithrombotics for at least 5 years. However, when there is a medical need for antithrombotic therapy during the follow-up, the prescription of antithrombotics is permitted with reporting to the research board.

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Major adverse cardiovascular and cerebrovascular events (MACCE)
Time Frame: at 2 years after the last enrollment
A composite of all-cause death, non-fatal myocardial infarction, any coronary revascularization, ischemic stroke, or transient ischemic attack
at 2 years after the last enrollment

Secondary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Major adverse cardiovascular and cerebrovascular events (MACCE)
Time Frame: at 5 years after the last enrollment
A composite of all-cause death, non-fatal myocardial infarction, any coronary revascularization, ischemic stroke, or transient ischemic attack
at 5 years after the last enrollment
Net adverse clinical event
Time Frame: at 2 years and 5 years after the last enrollment
A composite of all-cause death, non-fatal myocardial infarction, any coronary revascularization, ischemic stroke or transient ischemic attack, major bleeding
at 2 years and 5 years after the last enrollment
All-cause death
Time Frame: at 2 years and 5 years after the last enrollment
at 2 years and 5 years after the last enrollment
Non-fatal myocardial infarction
Time Frame: at 2 years and 5 years after the last enrollment
at 2 years and 5 years after the last enrollment
Any coronary revascularization
Time Frame: at 2 years and 5 years after the last enrollment
at 2 years and 5 years after the last enrollment
Ischemic stroke or Transient ischemic attack
Time Frame: at 2 years and 5 years after the last enrollment
at 2 years and 5 years after the last enrollment
Any non-coronary revascularization
Time Frame: at 2 years and 5 years after the last enrollment
at 2 years and 5 years after the last enrollment
Major bleeding events
Time Frame: at 2 years and 5 years after the last enrollment
BARC classification, type 3 or 5
at 2 years and 5 years after the last enrollment
BARC type 2 bleeding events
Time Frame: at 2 years and 5 years after the last enrollment
at 2 years and 5 years after the last enrollment
BARC type 3 bleeding events
Time Frame: at 2 years and 5 years after the last enrollment
at 2 years and 5 years after the last enrollment
BARC type 5 bleeding events
Time Frame: at 2 years and 5 years after the last enrollment
at 2 years and 5 years after the last enrollment

Collaborators and Investigators

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

Publications and helpful links

The person responsible for entering information about the study voluntarily provides these publications. These may be about anything related to the study.

General Publications

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)

March 22, 2023

Primary Completion (Estimated)

December 31, 2028

Study Completion (Estimated)

December 31, 2031

Study Registration Dates

First Submitted

April 25, 2023

First Submitted That Met QC Criteria

April 25, 2023

First Posted (Actual)

May 6, 2023

Study Record Updates

Last Update Posted (Actual)

December 31, 2025

Last Update Submitted That Met QC Criteria

December 28, 2025

Last Verified

December 1, 2025

More Information

Terms related to this study

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

NO

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

Studies a U.S. FDA-regulated device product

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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