Efficacy of Probucol Combined with Statins Treatment for Ischemic Stroke

This single-center, prospective, open-label study will assess the effects of combining Probucol with statin therapy on the progression of atherosclerosis and the risk of vascular events in people with ischemic stroke. The primary hypothesis is that, in participants receiving guideline-recommended statin therapy, the addition of Probucol will reduce cardiovascular and cerebrovascular event risk, enhance plaque stability, and be well-tolerated.

The study will include participants aged 18 years or older who have experienced an ischemic stroke within the past 30 days and have confirmed atherosclerosis in any major artery (carotid, coronary, aortic, renal, or peripheral arteries). Participants will either follow a guideline-recommended lipid-lowering regimen (statins, with or without ezetimibe or PCSK9 inhibitors as needed) or a similar regimen combined with Probucol 0.5g twice daily. The study will enroll at least 100 participants in both the standard therapy group and the Probucol combination group.

Primary outcomes will include changes in plaque burden, while secondary outcomes will cover atherosclerotic features, composite vascular events (ischemic stroke, ischemic heart disease, vascular death), stroke recurrence, and poor functional prognosis (mRS ≥ 3). Exploratory outcomes will include changes in biochemical markers such as LDL-C, Ox-LDL, and Lp(a). Safety will be assessed by monitoring adverse events and serious adverse events.

Statistical analysis will include a multivariate linear regression model for primary outcomes, adjusted for baseline characteristics such as LDL-C levels and previous cardiovascular events. For time-to-event endpoints, Kaplan-Meier curves will be used, with Cox proportional hazards models providing hazard ratios. Subgroup analyses and repeated measures will further refine the understanding of treatment effects.

Inclusion criteria

• Aged 18 years or older.
• Diagnosed with ischemic stroke (IS) confirmed by cranial CT/MRI.
• Onset of stroke within the last 30 days.
• Evidence of atherosclerosis (AS) in at least one artery (carotid, coronary, aorta, renal, or peripheral arteries) identified through neck CTA, coronary CTA, or ultrasound examination of lower extremity arteries.
• Signed informed consent.

Exclusion criteria

• History of allergy to Probucol or statins.
• Non-atherosclerotic arterial stenosis, such as vasculitis, moyamoya disease, or arterial dissection.
• Potential cardiac embolic sources, such as atrial fibrillation, artificial heart valves, endocarditis, or patent foramen ovale.
• Known bleeding tendencies or hemorrhagic diseases, such as thrombocytopenia (platelet count < 100 × 10^9/L), hemorrhagic stroke, or gastrointestinal bleeding.
• Severe myocardial diseases such as myocardial infarction (MI) or myocarditis.
• Liver (ALT or AST > twice the upper limit of normal) or kidney (creatinine > 1.5 times the upper limit of normal or glomerular filtration rate < 50 ml/min) dysfunction.
• Ventricular tachycardia, bradycardia, torsades de pointes, or syncopal episodes of cardiac origin.
• Prolonged QT interval or conditions that may prolong the QT interval, such as certain medications.
• Suffering from a severe illness with a life expectancy of less than one year or unable to cooperate due to cognitive or psychological issues.
• Use of Probucol or any lipid-lowering medication other than statins, ezetimibe, and PCSK9 inhibitors within the 30 days prior to enrollment, including bile acid sequestrants, fibrates, and other similar drugs.
• Pregnant or breastfeeding individuals, those trying to conceive.
• Concurrent participation in another clinical trial involving investigational drugs or devices within the past 30 days.
• Planned surgery or intervention that would require discontinuation of the study medication during the study period.
• Any reason, known to the participant and investigator, that would prevent the participant from adhering to the study protocol or follow-up.
• Other conditions determined by the investigator that may require exclusion.