- ICH GCP
- Registr klinických studií v USA
- Klinická studie NCT07720934
A Pilot Study to Investigate Platelet Reactivity in Patients With Elevated Lipoprotein(a) and Its Response to Antiplatelet Therapy (Lp(a)-PLAT)
A Pilot Study to Investigate Platelet Reactivity in Patients With Elevated Lipoprotein(a) and Its Response to Antiplatelet Therapy Randomised, Open-Label, Mechanistic Pilot Study With A Crossover Design
The Lp(a)-PLAT Study is designed to close a critical evidence gap in cardiovascular prevention for the roughly 20% of the population who carry genetically determined elevations in lipoprotein(a) - a recognised pro-thrombotic and pro-atherosclerotic risk factor. Its objective is to delineate the pro-thrombotic platelet phenotype driven by high Lp(a) levels and to evaluate, through pharmacodynamic comparison, how two standard-of-care antiplatelet strategies - clopidogrel, a P2Y12 ADP-receptor inhibitor, and aspirin, a COX-1 inhibitor - differ in their capacity to attenuate this platelet hyperreactivity.
This study will provide the first head-to-head mechanistic comparison of clopidogrel versus aspirin on platelet reactivity in patients with elevated plasma levels of Lp(a).
Přehled studie
Postavení
Podmínky
Intervence / Léčba
Typ studie
Zápis (Odhadovaný)
Fáze
- Nelze použít
Kontakty a umístění
Studijní kontakt
- Jméno: Kapka Miteva, PhD
- Telefonní číslo: +41 22 379 4648
- E-mail: Kapka.Miteva@unige.ch
Studijní místa
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Geneva, Švýcarsko, 1205
- Hôpitaux universitaires de Genève
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Kontakt:
- Véronique Menoni, PhD
- Telefonní číslo: +41 0223729195
- E-mail: veronique.menoni@hug.ch
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Vrchní vyšetřovatel:
- François Mach, Prof
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Kritéria účasti
Kritéria způsobilosti
Věk způsobilý ke studiu
- Dospělý
- Starší dospělý
Přijímá zdravé dobrovolníky
Popis
Inclusion Criteria:
- Age ≥ 18 years at the time of informed consent.
- Ability to provide written informed consent in accordance with Swiss Human Research Act (HRA) and ICH-GCP.
- Documented plasma lipoprotein(a) [Lp(a)] concentration:
High Lp(a) cohort: ≥ 125 nmol/L (approximately ≥ 75th percentile) Low Lp(a) comparator cohort (if applicable): < 25-30 nmol/L
- Clinically stable at the time of inclusion, with no acute cardiovascular event within the previous 3 months.
- Willingness and ability to comply with all study procedures, including blood sampling and study medication intake.
- For women of childbearing potential: willingness to use adequate contraception during the study period (if applicable according to local ethics requirements).
Exclusion Criteria:
- Cardiovascular and bleeding-related conditions Active bleeding or known bleeding disorder. History of hemorrhagic stroke or intracranial hemorrhage. High risk of bleeding as judged by the investigator. Platelet count < 100 × 10⁹/L at screening. Known platelet function disorder.
- Contraindications to study medications Known hypersensitivity or contraindication to aspirin (acetylsalicylic acid) or clopidogrel.
History of aspirin-induced asthma, severe NSAID intolerance, or anaphylactic reaction to salicylates.
Active peptic ulcer disease or clinically significant gastrointestinal bleeding within the past 6 months.
- Concomitant medications and interference with platelet function Current use of dual antiplatelet therapy (DAPT), oral anticoagulants (e.g., DOACs, vitamin K antagonists), or other potent antithrombotic agents that cannot be safely interrupted.
Use of non-steroidal anti-inflammatory drugs (NSAIDs) within 7 days prior to study entry (unless discontinued per protocol).
Use of P2Y12 inhibitors or aspirin within an insufficient washout period. - Clinical conditions Severe hepatic impairment (ALT/AST > 3× ULN) or severe renal impairment (eGFR < 30 mL/min/1.73 m²).
Active malignancy requiring systemic chemotherapy. Known hematologic disorder affecting platelet function or coagulation. Acute infection or inflammatory condition likely to affect platelet function.
- Other exclusions Pregnancy or breastfeeding. Participation in another interventional clinical trial within the last 30 days or 5 half-lives of the investigational product, whichever is longer.
Any condition that, in the opinion of the investigator, would interfere with study participation, compliance, or interpretation of results.
Studijní plán
Jak je studie koncipována?
Detaily designu
- Primární účel: Prevence
- Přidělení: Randomizované
- Intervenční model: Crossover Assignment
- Maskování: Singl
Zbraně a zásahy
Skupina účastníků / Arm |
Intervence / Léčba |
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Experimentální: Aspirin → Clopidogrel Sequence
Participants receive aspirin 100 mg once daily for 14 days, followed by a 14-day washout period, then clopidogrel 75 mg once daily for 14 days.
Platelet function is assessed at baseline and after each treatment period.
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Aspirin 100 mg administered orally once daily for 14 consecutive days during one treatment period of the randomized crossover study.
Participants receive aspirin either during Period 1 or Period 2 depending on the randomized treatment sequence.
A 14-day washout period separates the two treatment periods.
Clopidogrel 75 mg administered orally once daily for 14 consecutive days during one treatment period of the randomized crossover study.
Participants receive clopidogrel either during Period 1 or Period 2 depending on the randomized treatment sequence.
A 14-day washout period separates the two treatment periods.
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Experimentální: Clopidogrel → Aspirin Sequence
Participants receive clopidogrel 75 mg once daily for 14 days, followed by a 14-day washout period, then aspirin 100 mg once daily for 14 days.
Platelet function is assessed at baseline and after each treatment period.
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Aspirin 100 mg administered orally once daily for 14 consecutive days during one treatment period of the randomized crossover study.
Participants receive aspirin either during Period 1 or Period 2 depending on the randomized treatment sequence.
A 14-day washout period separates the two treatment periods.
Clopidogrel 75 mg administered orally once daily for 14 consecutive days during one treatment period of the randomized crossover study.
Participants receive clopidogrel either during Period 1 or Period 2 depending on the randomized treatment sequence.
A 14-day washout period separates the two treatment periods.
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Co je měření studie?
Primární výstupní opatření
Měření výsledku |
Popis opatření |
Časové okno |
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Change in collagen-induced platelet aggregation after aspirin versus clopidogrel treatment
Časové okno: Baseline and Day 14 of each treatment period (up to 42 days)
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Within-participant change from baseline in collagen-induced platelet aggregation measured by light transmission aggregometry (LTA) after 14 days of aspirin 100 mg once daily compared with 14 days of clopidogrel 75 mg once daily in the randomized crossover design.
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Baseline and Day 14 of each treatment period (up to 42 days)
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Change in soluble platelet activation biomarkers after aspirin versus clopidogrel treatment
Časové okno: Baseline and Day 14 of each treatment period (up to 42 days)
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Within-participant change from baseline in soluble platelet activation biomarkers (including soluble P-selectin/CD62P, soluble CD40 ligand [sCD40L], platelet factor 4 [PF4], and related biomarkers) following 14 days of aspirin 100 mg once daily compared with 14 days of clopidogrel 75 mg once daily.
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Baseline and Day 14 of each treatment period (up to 42 days)
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Sekundární výstupní opatření
Měření výsledku |
Popis opatření |
Časové okno |
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Agonist-specific platelet aggregation
Časové okno: Baseline and Day 14 of each treatment period (up to 42 days)
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Change from baseline in platelet aggregation measured by light transmission aggregometry following stimulation with arachidonic acid, ADP, and TRAP-6 after each treatment period.
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Baseline and Day 14 of each treatment period (up to 42 days)
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Platelet surface activation markers
Časové okno: Baseline and Day 14 of each treatment period (up to 42 days)
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Change from baseline in platelet surface expression of CD62P (P-selectin) and activated GPIIb/IIIa measured by flow cytometry following aspirin and clopidogrel treatment.
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Baseline and Day 14 of each treatment period (up to 42 days)
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Biochemical verification of aspirin pharmacodynamic effect
Časové okno: Day 14 of the aspirin treatment period
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Serum thromboxane B2 (TxB2) concentration measured to verify cyclooxygenase-1 inhibition during aspirin treatment.
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Day 14 of the aspirin treatment period
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Biochemical verification of clopidogrel pharmacodynamic effect
Časové okno: Day 14 of the clopidogrel treatment period
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Vasodilator-stimulated phosphoprotein (VASP) platelet reactivity index (PRI) measured to verify P2Y12 receptor inhibition during clopidogrel treatment.
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Day 14 of the clopidogrel treatment period
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Association between plasma lipoprotein(a) concentration and platelet function
Časové okno: Baseline and Day 14 of each treatment period (up to 42 days)
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Correlation between plasma lipoprotein(a) concentration and platelet function parameters measured by light transmission aggregometry, flow cytometry, and soluble biomarkers.
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Baseline and Day 14 of each treatment period (up to 42 days)
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Baseline comparison of platelet reactivity between participants with high and low lipoprotein(a)
Časové okno: Baseline (Day 0)
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Comparison of baseline platelet function parameters between participants with elevated lipoprotein(a) (>125 nmol/L) and matched participants with low lipoprotein(a) (<25 nmol/L).
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Baseline (Day 0)
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Plasma proteomic profile associated with lipoprotein(a) and antiplatelet therapy (Exploratory)
Časové okno: Baseline and Day 14 of each treatment period (up to 42 days)
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Exploratory analysis of plasma proteins measured using the Olink® proximity extension assay platform to identify proteins associated with elevated lipoprotein(a), platelet reactivity, and treatment with aspirin or clopidogrel.
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Baseline and Day 14 of each treatment period (up to 42 days)
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Další výstupní opatření
Měření výsledku |
Popis opatření |
Časové okno |
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Identification of candidate biomarkers associated with lipoprotein(a)-related platelet hyperreactivity
Časové okno: Baseline and Day 14 of each treatment period (up to 42 days)
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Exploratory identification of circulating protein biomarkers associated with platelet hyperreactivity and pharmacodynamic response to aspirin and clopidogrel using Olink® proteomic analysis.
Results are hypothesis-generating only.
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Baseline and Day 14 of each treatment period (up to 42 days)
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Spolupracovníci a vyšetřovatelé
Sponzor
Spolupracovníci
Vyšetřovatelé
- Vrchní vyšetřovatel: François Mach, Prof, HUG
Termíny studijních záznamů
Hlavní termíny studia
Začátek studia (Odhadovaný)
Primární dokončení (Odhadovaný)
Dokončení studie (Odhadovaný)
Termíny zápisu do studia
První předloženo
První předloženo, které splnilo kritéria kontroly kvality
První zveřejněno (Aktuální)
Aktualizace studijních záznamů
Poslední zveřejněná aktualizace (Aktuální)
Odeslaná poslední aktualizace, která splnila kritéria kontroly kvality
Naposledy ověřeno
Více informací
Termíny související s touto studií
Klíčová slova
Další relevantní podmínky MeSH
- Sloučeniny síry
- Organické chemikálie
- Pyridiny
- Heterocyklické sloučeniny, 1 kruh
- Heterocyklické sloučeniny
- Heterocyklické sloučeniny, 2-prsten
- Heterocyklické sloučeniny, fúzované kroužek
- Uhlovodíky
- Uhlovodíky, cyklické
- Uhlovodíky, aromatické
- Fenoly
- Deriváty benzenu
- Thiofeny
- Salicyláty
- Hydroxybenzoates
- Ticlopidin
- Thienopyridiny
- Clopidogrel
- Aspirin
Další identifikační čísla studie
- 2026-01415
Plán pro data jednotlivých účastníků (IPD)
Plánujete sdílet data jednotlivých účastníků (IPD)?
Popis plánu IPD
Individual participant data collected during the Lp(a)-PLAT study, including clinical data, laboratory results, and platelet function measurements, will not be shared in public data repositories.
Given the mechanistic nature of the study and the small sample size, there is a potential risk of indirect re-identification of participants even after standard anonymisation procedures. Therefore, raw participant-level datasets will remain under controlled access within the Sponsor institution (Hôpitaux Universitaires de Genève, HUG).
Informace o lécích a zařízeních, studijní dokumenty
Studuje lékový produkt regulovaný americkým FDA
Studuje produkt zařízení regulovaný americkým úřadem FDA
produkt vyrobený a vyvážený z USA
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