Determining Genetic Role in Treatment Response to Anti-Platelet Interventions (The PAPI Study)

NCT00799396 | Completed Phase 4 Results DMC

• 3 other identifiers: HP-00043419U01 HL074518-01U01GM074518
• Study Type: interventional
• Target: 682
• Locations: 1 country
• Sites: 1

Brief Summary

One of the most common ways for preventing coronary heart disease (CHD) is to take aspirin or clopidogrel. However, studies have shown that not all people respond to these medications. The variance in treatment response may be linked to genetics. This study will examine the effects of aspirin and clopidogrel in a population whose genes are well known in order to determine the role that genes play in treatment responses.

Conditions

Platelet Aggregation Inhibitors; Coronary Heart Disease

Outcome Measures

Primary Outcomes (2)

• Changes in Platelet Function in Response to Clopidogrel

  Baseline minus post clopidogrel/pre-aspirin platelet rich plasma (PRP) maximum aggregation.

  Measured at baseline, and after clopidogrel treatment

• Changes in Platelet Function in Response to Clopidogrel Plus Aspirin

  Baseline minus post clopidogrel/post-aspirin platelet rich plasma (PRP) maximum aggregation

  Measured at baseline, and after clopidogrel plus aspirin treatment

Study Arms (1)

Overall Study

EXPERIMENTAL

Participants will receive clopidogrel treatment alone, followed by clopidogrel plus aspirin treatment on the last day of treatment.

Drug: Clopidogrel; Drug: Aspirin

Interventions

Clopidogrel DRUG

300 mg on first day, then 75 mg per day for the next 6 days

Overall Study

Aspirin DRUG

Single dose of 324 mg on the last day of clopidogrel treatment

Overall Study

Eligibility Criteria

• Age: 20 Years+
• Sex: all
• Healthy Volunteers: Yes
• Age Groups: Adult (18-64), Older Adult (65+)

You may qualify if:

• Of Old Order Amish descent

You may not qualify if:

• Currently pregnant or less than 6 months have passed since delivery
• Has a history of a bleeding disorder or major spontaneous bleed, such as peptic ulcer, epistasis, or intracranial bleed
• Has severe hypertension, defined by a blood pressure above 160/95 mm Hg, making it unethical not to recommend prompt treatment
• Takes medications that would affect the outcome(s) to be measured and cannot willingly and safely, in the opinion of the treating physician and study physician, discontinue these medications for 1 week prior to protocol initiation
• Is taking vitamins or other supplements and is unwilling to discontinue their use for at least 1 week prior to study
• Has a coexisting malignancy
• Has a creatinine level greater than 2.0 mg/dl, aspartate transaminase (AST) or alanine transaminase (ALT) greater than two times the upper limit of normal, hematocrit less than 32%, or a thyroid-stimulating hormone (TSH) less than 0.4 or greater than 5.5 mIU/L
• Has a bleeding disorder or history of gastrointestinal bleeding or other major bleeding episode
• Is currently taking aspirin, clopidogrel, or other anti-coagulant, such as warfarin, heparin, or GPIIb/IIIa antagonists, and have conditions that might place them at increased risk from withdrawal of these medications 14 days prior to protocol initiation, including history of unstable angina, heart attack, angioplasty (including stent placement), coronary artery bypass surgery, atrial fibrillation, stroke or transient ischemic attacks, diabetes, or deep vein thrombosis or other thrombosis
• Has polycythemia, or thrombocytosis, defined by a platelet count greater than 500,000
• Has thrombocytopenia, defined by a platelet count less than 75,000
• Has had surgery within the last 6 months
• Has an aspirin or clopidogrel allergy
• Currently breast feeding

Sponsors & Collaborators

• University of Maryland, Baltimore: lead
• National Institute of General Medical Sciences (NIGMS): collaborator
• National Heart, Lung, and Blood Institute (NHLBI): collaborator

Study Sites (1)

Amish Research Clinic

Lancaster, Pennsylvania, 17601, United States

Location

Related Publications (8)

• Shuldiner AR, O'Connell JR, Bliden KP, Gandhi A, Ryan K, Horenstein RB, Damcott CM, Pakyz R, Tantry US, Gibson Q, Pollin TI, Post W, Parsa A, Mitchell BD, Faraday N, Herzog W, Gurbel PA. Association of cytochrome P450 2C19 genotype with the antiplatelet effect and clinical efficacy of clopidogrel therapy. JAMA. 2009 Aug 26;302(8):849-57. doi: 10.1001/jama.2009.1232.

  PMID: 19706858 RESULT

• Bozzi LM, Mitchell BD, Lewis JP, Ryan KA, Herzog WR, O'Connell JR, Horenstein RB, Shuldiner AR, Yerges-Armstrong LM. The Pharmacogenomics of Anti-Platelet Intervention (PAPI) Study: Variation in Platelet Response to Clopidogrel and Aspirin. Curr Vasc Pharmacol. 2016;14(1):116-24. doi: 10.2174/1570161113666150916094829.

  PMID: 26374108 RESULT

• Lewis JP, Ryan K, O'Connell JR, Horenstein RB, Damcott CM, Gibson Q, Pollin TI, Mitchell BD, Beitelshees AL, Pakzy R, Tanner K, Parsa A, Tantry US, Bliden KP, Post WS, Faraday N, Herzog W, Gong Y, Pepine CJ, Johnson JA, Gurbel PA, Shuldiner AR. Genetic variation in PEAR1 is associated with platelet aggregation and cardiovascular outcomes. Circ Cardiovasc Genet. 2013 Apr;6(2):184-92. doi: 10.1161/CIRCGENETICS.111.964627. Epub 2013 Feb 7.

  PMID: 23392654 RESULT

• Lewis JP, Horenstein RB, Ryan K, O'Connell JR, Gibson Q, Mitchell BD, Tanner K, Chai S, Bliden KP, Tantry US, Peer CJ, Figg WD, Spencer SD, Pacanowski MA, Gurbel PA, Shuldiner AR. The functional G143E variant of carboxylesterase 1 is associated with increased clopidogrel active metabolite levels and greater clopidogrel response. Pharmacogenet Genomics. 2013 Jan;23(1):1-8. doi: 10.1097/FPC.0b013e32835aa8a2.

  PMID: 23111421 RESULT

• Lewis JP, Fisch AS, Ryan K, O'Connell JR, Gibson Q, Mitchell BD, Shen H, Tanner K, Horenstein RB, Pakzy R, Tantry US, Bliden KP, Gurbel PA, Shuldiner AR. Paraoxonase 1 (PON1) gene variants are not associated with clopidogrel response. Clin Pharmacol Ther. 2011 Oct;90(4):568-74. doi: 10.1038/clpt.2011.194. Epub 2011 Aug 31.

  PMID: 21881565 RESULT

• Lewis JP, Stephens SH, Horenstein RB, O'Connell JR, Ryan K, Peer CJ, Figg WD, Spencer SD, Pacanowski MA, Mitchell BD, Shuldiner AR. The CYP2C19*17 variant is not independently associated with clopidogrel response. J Thromb Haemost. 2013 Sep;11(9):1640-6. doi: 10.1111/jth.12342.

  PMID: 23809542 RESULT

• Bergmeijer TO, Reny JL, Pakyz RE, Gong L, Lewis JP, Kim EY, Aradi D, Fernandez-Cadenas I, Horenstein RB, Lee MTM, Whaley RM, Montaner J, Gensini GF, Cleator JH, Chang K, Holmvang L, Hochholzer W, Roden DM, Winter S, Altman RB, Alexopoulos D, Kim HS, Dery JP, Gawaz M, Bliden K, Valgimigli M, Marcucci R, Campo G, Schaeffeler E, Dridi NP, Wen MS, Shin JG, Simon T, Fontana P, Giusti B, Geisler T, Kubo M, Trenk D, Siller-Matula JM, Ten Berg JM, Gurbel PA, Hulot JS, Mitchell BD, Schwab M, Ritchie MD, Klein TE, Shuldiner AR; ICPC Investigators. Genome-wide and candidate gene approaches of clopidogrel efficacy using pharmacodynamic and clinical end points-Rationale and design of the International Clopidogrel Pharmacogenomics Consortium (ICPC). Am Heart J. 2018 Apr;198:152-159. doi: 10.1016/j.ahj.2017.12.010. Epub 2017 Dec 17.

  PMID: 29653637 DERIVED

• Salimi S, Lewis JP, Yerges-Armstrong LM, Mitchell BD, Saeed F, O'Connell JR, Perry JA, Ryan KA, Shuldiner AR, Parsa A. Clopidogrel Improves Skin Microcirculatory Endothelial Function in Persons With Heightened Platelet Aggregation. J Am Heart Assoc. 2016 Oct 31;5(11):e003751. doi: 10.1161/JAHA.116.003751.

  PMID: 27799230 DERIVED

Related Links

• dbGaP submission for the PAPI study

MeSH Terms

Conditions

Coronary Disease

Interventions

Clopidogrel; Aspirin

Condition Hierarchy (Ancestors)

Myocardial Ischemia; Heart Diseases; Cardiovascular Diseases; Vascular Diseases

Intervention Hierarchy (Ancestors)

Ticlopidine; Thienopyridines; Thiophenes; Sulfur Compounds; Organic Chemicals; Pyridines; Heterocyclic Compounds, 1-Ring; Heterocyclic Compounds; Heterocyclic Compounds, 2-Ring; Heterocyclic Compounds, Fused-Ring; Salicylates; Hydroxybenzoates; Phenols; Benzene Derivatives; Hydrocarbons, Aromatic; Hydrocarbons, Cyclic; Hydrocarbons

Results Point of Contact

• Title: Alan R Shuldiner, MD
• Organization: University of Maryland School of Medicine

ashuldin@medicine.umaryland.edu

410-706-1623

Study Officials

• Alan R. Shuldiner, MD

  University of Maryland, Baltimore

  PRINCIPAL INVESTIGATOR

Publication Agreements

• PI is Sponsor Employee: Yes

Study Design

• Study Type: interventional
• Phase: phase 4
• Allocation: NA
• Masking: NONE
• Purpose: TREATMENT
• Intervention Model: SINGLE GROUP
• Sponsor Type: OTHER
• Responsible Party: PRINCIPAL INVESTIGATOR
• PI Title: Associate Dean for Personalized Medicine; Director, Program in Personalized and Genomic Medicine; Head, Division of Endocrinology, Diabetes and Nutrition

Study Record Dates

• First Submitted: November 26, 2008
• First Posted: November 27, 2008
• Study Start: July 1, 2006
• Primary Completion: February 1, 2012
• Study Completion: February 1, 2012
• Last Updated: February 24, 2022
• Results First Posted: March 28, 2016

Record last verified: 2022-02

Locations

US (1)