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StrokePhase 3RIISC-THETISNCT05476991

Evaluation of Low Dose Colchicine and Ticagrelor in Prevention of Ischemic Stroke in Patients With Stroke Due to Atherosclerosis

A Phase 3 study testing Colchicine 0.5 MG, Ticagrelor 90mg and Aspirin 75-300mg in people with Stroke and Stroke, Ischemic, run by Assistance Publique - Hôpitaux de Paris at 1 site in France.

Recruiting

Looking for participants now. Contact the study team or a site below to ask about taking part.

Sites and contacts
Official record
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Trial summary

REDUCING INFLAMMATION IN ISCHEMIC STROKE WITH COLCHICINE, AND TICAGRELOR IN HIGH-RISK PATIENTS-EXTENDED TREATMENT IN ISCHEMIC STROKE. Read more about this study

Who is it for?
Ages 18 years and older
Conditions the study is for
Stroke, Stroke, Ischemic, Atherosclerosis
What is being tested?
Colchicine 0.5 MG, Ticagrelor 90mg and Aspirin 75-300mg
Could I receive a placebo?
No, everyone receives an active treatment
How many people
2,800 participants
Where
1 siteFrance
Study dates
17 May 2023to 1 Sep 2027
Phase
Phase 3
Are there results?
Not yet: the study is under way

Key requirements

Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.

  • Ages 18 years and older
  • All sexes
  • No healthy volunteers
  • Adult, Older adult

Who may be able to join

  • Patient should have the following:
  • Patient with:
  • Cerebral infarction (CI) proven by neuro-imaging (MRI or head-CT), immediately once the neurologic deficit is stabilized (investigator judgement) if the patient was on antiplatelet agent monotherapy after the qualifying event, or after 21 days if the patient was on clopidogrel plus aspirin after the qualifying event, or after 21 to 30 days if the patient was on ticagrelor plus aspirin after the qualifying event (TIA with documented ischemic lesion (MRI or CT) in the appropriate area corresponding to the symptoms will be considered CI, following the current definition)
  • Or TIA lasting more 10 minutes or more (with motor symptoms or aphasia/dysarthria or visual defect), with total resolution and no brain lesion on neuro-imaging (TIA) and with ipsilateral carotid stenosis that was revascularized (endarterectomy or stenting) or with ipsilateral, potentially causal intracranial stenosis ≥70%) if the patient was on antiplatelet agent monotherapy after the qualifying event, or after 21 days if the patient was on clopidogrel plus aspirin after the qualifying event, or after 21 to 30 days if the patient was on ticagrelor plus aspirin after the qualifying event
  • and documented atherosclerotic stenosis:
  • presence of carotid atherosclerotic stenosis (on the basis of carotid duplex, CTA, MRA, XRA - only the report will be required to document atherosclerotic disease) ipsilateral to the cerebral ischemic symptoms (stenosis defined by luminal narrowing ≥30%, judgement of the investigator)
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  • or presence of atherosclerotic stenosis of another cerebral artery (documented vertebral artery stenosis, basilar artery stenosis, other intracranial artery stenosis) ipsilateral to the ischemic area (stenosis defined by luminal narrowing ≥30%, judgement of the investigator)
  • or presence of atherosclerotic disease of the aortic arch with a plaque ≥4mm in thickness with or without superimposed thrombus, or a plaque <4 mm with a superimposed mobile thrombus (detected by transesophageal echocardiography or CT angiography)
  • with no clear indication of colchicine treatment (gout, Mediterranean fever) and with an indication to long-term antiplatelet therapy (no clear indication to oral anticoagulant)
  • age equal or above 18
  • Rankin score less than ≤4 (ranges from 0 to 6, with 0 indicating no symptoms, 1 no disability, 2 to 3 needing some help with daily activities, 4 to 5 dependent or bedridden, and 6 death),
  • fully informed and signed inform consent
  • with social security number.
  • medical examination before the participation to the research
  • Under contraception in case of childbearing potential (highly effective: 1) combined (estrogen and progestogen containing) hormonal contraception associated with inhibition of ovulation et 2) progestogen-only).
  • Pregnancy test for women of childbearing potential

Who cannot join

  • Colchicine treatment needed (e.g., gout, Mediterranean fever)
  • Hypersensitivity to ticagrelor or any of the excipients.
  • Hypersensitivity to colchicine or any of the excipients.
  • Major digestive disorders (chronic diarrhea, inflammatory disease of the digestive tract as uncontrolled ulcerative colitis or active Crohn disease)
  • Immunosuppression, medullary aplasia
  • Active chronic inflammatory disease, chronic active infection, evolving cancer
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  • Hemodynamic instability (need for amines for more than 24 hours, circulatory assistance)
  • A recent severe sepsis (7 days) or all recent acute reaches
  • Chronic treatment (for more than 6 months) with corticosteroids or NSAIDs (or repeated high-dose intake for less than 7 days).
  • Anticipated concomitant oral or intravenous therapy with strong CYP3A4 inhibitors or CYP3A4 substrates than cannot be stopped for the course of the course of this study
  • CI/TIA due to arterial dissection (as documented following the judgment of the investigator) or due to cardiac source of embolism without documented atherosclerotic disease (e.g., mitral stenosis or endomyocardial fibrosis, endocarditis) a patient with atrial fibrillation, or with a history of myocardial infarction, or with calcified aortic stenosis will be eligible if the above inclusion criteria are also met]
  • Indication to long-term oral anticoagulant treatment (e.g., atrial fibrillation)
  • Symptomatic hemorrhagic stroke (the mere presence of asymptomatic cerebral hemosiderin deposits -so called "microbleedings" - on gradient echo imaging is not an exclusion criteria)
  • Active pathological bleeding
  • Uncontrolled hypertension (investigator judgement)
  • Follow-up visit impossible or anticipated bad compliance.
  • Intercurrent disease that may interfere with evaluation of the primary end-point or that may prevent follow-up study visits..
  • Anticipated pregnancy at time of enrollment in the study
  • Breastfeeding woman
  • Patients participating in another pharmaco therapeutic program with an experimental therapy that is known to affect the ticagrerlor, colchicine or aspirine therapy.
  • Leukopenia <3000/μl
  • Patients with severe renal impairment (creatinine clearance < 30 ml/min)
  • Patients with severe hepatic impairment
  • Prohibited treatments: All treatments contraindicated during the use of colchicine and/or ticagrelor

Trial locations and contacts

1 site in 1 country. Contact the study team or a site near you to ask about taking part.

France1 site, 1 recruiting
  • URC Lariboisière-Fernand Widal-Saint Louis

    Paris, Paris, 75010

    Brahim M Elarbi, 01 40 05 43 60 ext. +33, brahim.mohamed-elarbi@aphp.fr

    Pierre Amarenco, Pr

    Recruiting

Other trials in France

About this study

Official title: Reducing Inflammation in Ischemic Stroke With Colchicine, and Ticagrelor in High-risk Patients-extended Treatment in Ischemic Stroke

REDUCING INFLAMMATION IN ISCHEMIC STROKE WITH COLCHICINE, AND TICAGRELOR IN HIGH-RISK PATIENTS-EXTENDED TREATMENT IN ISCHEMIC STROKE.

Read the detailed description

Our main hypothesis is that low-dose colchicine (0.5 mg/day) on top of best medical care, in patients with an ischemic stroke with ipsilateral atherosclerotic stenosis, will reduce the risk of major vascular events after 36-60 months of treatment as compared to no colchicine.

Our second main hypothesis, tested in 2x2 factorial design, is that ticagrelor 90 mg bid in the same patients, will reduce the long-term risk of major vascular events (after 36-60 months of treatment) as compared to aspirin 75-300 mg/day.

Being tested
Colchicine 0.5 MG, Ticagrelor 90mg, Aspirin 75-300mg
Keywords
Stroke, Colchicine, Atherosclerosis, Aspirin, Ticagrelor
Medical subject headings
Stroke, Ischemic Stroke, Atherosclerosis, Myocardial Infarction, Angina, Unstable, Heart Diseases, Cerebral Infarction

What participants receive

What participants receive. In a randomised study each person is assigned to one group by chance.

  • Colchicine 0.5 MGDrug

    Colchicine is a medication used to treat gout and Behçet's disease. In gout, it is less preferred to NSAIDs or steroids. Other uses for colchicine include the management of pericarditis and familial Mediterranean fever.

  • Ticagrelor 90mgDrug

    Also called Brilinta

    Ticagrelor, sold under the brand name Brilinta among others, is a medication used for the prevention of stroke, heart attack and other events in people with acute coronary syndrome, meaning problems with blood supply in the coronary arteries. It acts as a platelet aggregation inhibitor by antagonising the P2Y 12 receptor.

  • Aspirin 75-300mgDrug

    Also called Acetylsalicylic acid

    Also known as Aspirin, acetylsalicylic acid (ASA) is a commonly used drug for the treatment of pain and fever due to various causes. Acetylsalicylic acid has both anti-inflammatory and antipyretic effects. This drug also inhibits platelet aggregation and is used in the prevention of blood clots stroke, and myocardial infarction (MI).

Study groups in NCT05476991
Study groupRoleWhat they receive
Colchicine + TicagrelorExperimentalNot described
Receives: Drug: Colchicine 0.5 MG; Drug: Ticagrelor 90mg
Colchine + AspirineExperimentalNot described
Receives: Drug: Colchicine 0.5 MG; Drug: Aspirin 75-300mg
SOC + TicagrelorExperimentalNot described
Receives: Drug: Ticagrelor 90mg
SOC + AspirineActive comparatorNot described
Receives: Drug: Aspirin 75-300mg

What is being measured

The primary outcome is the main question the study is designed to answer.

  1. Number of Participants with nonfatal ischemic stroke

    Sudden onset of focal neurologic symptoms related to impaired cerebral circulation. ASCOD phenotyping will be used. TIAs will not be part of strokes. However, any focal neurologic symptoms associated with positive DWI or hypodensity on the CT scan in an appropriate area in relation with these symptoms will be considered a cerebral infarction and be part of "strokes".

    Measured: 36 months

  2. Number of Participants with undetermined stroke

    Sudden onset of focal neurologic symptoms related to impaired cerebral circulation. ASCOD phenotyping will be used. TIAs will not be part of strokes. However, any focal neurologic symptoms associated with positive DWI or hypodensity on the CT scan in an appropriate area in relation with these symptoms will be considered a cerebral infarction and be part of "strokes".

    Measured: 36 months

  3. Number of Participants with nonfatal myocardial infarction

    • Fatal or nonfatal myocardial infarction (OMS.AHA/ACC definition)
    • Clinical symptoms + elevated troponin
    • Silent myocardial infarction following universal definition

    Measured: 36 months

  4. Number of Participants with urgent coronary or carotid revascularization following new symptoms

    Revascularization Procedure

    • Coronary : Angioplasty or stenting or CABG
    • Carotid : angioplasty or stenting, surgical endarterectomy
    • Peripheral: angioplasty or stenting including aorta, surgical by-pass or endarterectomy of a peripheral artery.

    Measured: 36 months

  5. Number of Participants with vascular death including sudden death

    • Vascular death
    • Death due to cardiac or vascular cause
    • Death due to systemic hemorrhage
    • Death due to pulmonary embolism
    • Sudden death: death occurring within 24 hours, unexpected in a patient in apparent healthy condition or condition that was stable or improved
    • Death without documented nonvascular cause
    • Fatal stroke: death occurring within 30 days of stroke onset (whether ischemic or hemorrhagic).

    Measured: 36 months

Secondary outcomes (11)
  1. Number of Participants with recurrent fatal and nonfatal ischemic stroke

    Measured: 36 months

  2. Number of Participants with urgent carotid revascularization following a new transient ischemic attack with negative neuro-imaging

    Measured: 36 months

  3. Number of Participants with fatal and nonfatal myocardial infarction

    Measured: 36 months

  4. Number of Participants with fatal and nonfatal myocardial infarction or urgent coronary revascularization following a new acute coronary syndrome

    Measured: 36 months

  5. Number of Participants with vascular death

    Measured: 36 months

  6. Number of Participants with any stroke or TIA

    A TIA is defined by sudden onset of neurologic symptoms presumed of ischemic origin, with total resolution, being clearly related to focal cerebral or retinal involvement, and with negative neuro-imaging in the cerebral area corresponding to the symptoms. TIA diagnosis must be confirmed by a neurologist, based on clinical and negative neuro-imaging evaluation (MRI with DWI is recommended).

    Measured: 36 months

  7. Number of Participants with major coronary events

    Measured: 36 months

  8. Number of Participants with any coronary end-points (MI, hospitalization for recurrent ACS, coronary revascularization procedure urgent or elective, fatal coronary event)

    ACS: Acute Coronary Syndrome

    Measured: 36 months

  9. Number of death participant (any death)

    Measured: 36 months

  10. Number of Participant with all revascularization procedures (coronary, carotid, peripheral)

    Measured: 36 months

  11. Number of Participants with Carotid revascularization

    Measured: 36 months

Timeline

From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.

  1. First posted27 Jul 2022
  2. Study start17 May 2023
  3. Primary completion1 Sep 2027 (estimated)
  4. Study completion1 Sep 2027 (estimated)

Resources

More details

For doctors and researchers: how the study is designed, who runs it, and its registry IDs.

Study design
Study type
Interventional
Phase
Phase 3
Primary purpose
Treatment
Allocation
Randomised
Intervention model
Factorial
Masking
None (open label)
Enrolment
2,800 participants (estimated)
IDs, dates and publications
ClinicalTrials.gov ID
NCT05476991
Sponsor's protocol ID
APHP211055
Acronym
RIISC-THETIS
Status last verified
Jun 2025
First submitted
25 Jul 2022
Last updated
8 Sep 2025
Results posted
No
Data monitoring committee
Yes
FDA-regulated drug
No
FDA-regulated device
No
Individual data sharing
No

Questions about this trial

What is this clinical trial studying?

A Phase 3 study testing Colchicine 0.5 MG, Ticagrelor 90mg and Aspirin 75-300mg in people with Stroke and Stroke, Ischemic, run by Assistance Publique - Hôpitaux de Paris at 1 site in France.

The full registered description is in the About this study section and the official record.

Who may be eligible to take part?

The sponsor lists 16 inclusion and 24 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.

Is this clinical trial currently recruiting?

The record says: looking for participants now, as of the sponsor's last update on 8 Sep 2025. Status can change between updates, so confirm with the study contact before making plans.

Where is the study taking place?

The record lists 1 site in France. Whether a site is taking part right now should be confirmed with that site. See every site.

What are the possible benefits and risks?

They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.

What does this phase mean?

Phase 3 studies compare the treatment with the current standard treatment or a placebo in a large group, to confirm how well it works and watch for side effects.

Not every study follows the same path, and some studies (observational studies, device studies) have no phase.

Are results available for this study?

This study is still under way. Results are not available in the source record yet.

How can a doctor refer a patient or contact the research team?

Contact Pierre Amarenco, Pr (140258725 ext. +33, pierre.amarenco@gmail.com), or a site near the patient. AzTrials does not enrol participants or take referrals.

What does the primary outcome measure?

Number of Participants with nonfatal ischemic stroke (time frame: 36 months). The study lists 5 primary outcomes in all. It is what the study was designed to measure, not a finding.

Where can I read the original study information?
Does a listing mean the treatment is approved or proven to work?

No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.

How often is this information updated?

AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 8 Sep 2025.

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