We're building a better ClinicalTrials.gov. Check it out and tell us what you think!
ClinicalTrials.gov Menu

Effect of Cilostazol on Endothelial Progenitor Cells and Endothelial Function in High Risk for Cardiovascular Disease

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details.
ClinicalTrials.gov Identifier: NCT02194686
Recruitment Status : Completed
First Posted : July 18, 2014
Last Update Posted : October 14, 2015
Department of Health, Executive Yuan, R.O.C. (Taiwan)
Information provided by (Responsible Party):
National Cheng-Kung University Hospital

Brief Summary:
  1. The number and function of circulating endothelial progenitor cells (EPCs) are inversely associated with coronary risk factors and atherosclerotic diseases.
  2. This double-blind, randomized, placebo-controlled trial to evaluate the effects of cilostazol on human early EPCs and endothelial function as well as the potential mechanisms of action in patients with high risk for cardiovascular disease.

Condition or disease Intervention/treatment Phase
Cardiovascular Diseases Drug: Cilostazol Drug: Dummy Placebo Phase 4

Detailed Description:
  1. titration of drugs

    1. run-in period: eligible subjects are screened and baseline blood samples are obtained
    2. study period: 12 weeks

      • subjects with cilostazol and subjects with dummy placebo
      • On the first day after the end of the study period, the follow-up data are obtained by the same procedure
    3. blood sampling and measurement of serum biomarkers

      • obtained from peripheral veins in all study subjects at the run-in period and the end of the treatment period of the study
      • sent for isolation, cell culture, and assays of human EPCs
      • also stored for enzyme-linked immunosorbent assay (stromal cell derived factor-alfa1, adiponectin, soluble thrombomodulin, vascular endothelial growth factor)
  2. assays of human EPCs

    1. colony formation by EPCs
    2. quantification of EPCs and apoptotic endothelial cells
    3. chemotactic motility, proliferation/viability and apoptosis assays
  3. measurement of flow-mediated dilatation (FMD) of left brachial artery by sonography

Layout table for study information
Study Type : Interventional  (Clinical Trial)
Actual Enrollment : 71 participants
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Quadruple (Participant, Care Provider, Investigator, Outcomes Assessor)
Primary Purpose: Treatment
Official Title: Cilostazol Enhances the Number and Functions of Circulating Endothelial Progenitor Cells Mediated Through Multiple Mechanisms in Patients With High Risk for Cardiovascular Disease
Study Start Date : January 2013
Actual Primary Completion Date : March 2014
Actual Study Completion Date : August 2014

Resource links provided by the National Library of Medicine

Drug Information available for: Cilostazol

Arm Intervention/treatment
Active Comparator: Cilostazol
One tablet (100 mg) twice per day for 12 weeks
Drug: Cilostazol
One tablet (100 mg) twice per day for 12 weeks
Other Name: Pletaal (brand name)

Placebo Comparator: Dummy Placebo
One tablet twice per day for 12 weeks
Drug: Dummy Placebo
One tablet twice per day for 12 weeks
Other Names:
  • Placebo
  • Control

Primary Outcome Measures :
  1. Circulating EPCs Number [ Time Frame: 3 months ]
    Peripheral blood mononuclear cells (one million cells in each) are suspended in 100 µL phosphate-buffered saline and incubated for 30 min with monoclonal antibodies against human peridinin chlorophyll protein-conjugated cluster of differentiation antigen-45, phycoerythrin-conjugated anti-human cluster of differentiation antigen-34 antibody and anti-human kinase insert domain receptor (KDR) antibody conjugated with Alexa Flour 647. Cells are washed and analyzed on a FACSCalibur flow cytometer with 100,000 events in the lymphocyte gate. EPCs, which are defined as negative for cluster of differentiation antigen-45 and positive for cluster of differentiation antigen-34 and KDR. Based on the peripheral blood mononuclear cell counts, the absolute number of circulating EPCs/µL is calculated.

Secondary Outcome Measures :
  1. Viability (Proliferation) of EPCs [ Time Frame: 3 months ]
    250,000 cells are seeded in each well of a 96-well plate and the cells are added with 200 μl of the culture medium and incubated at 37°C. Medium change is performed 3 days later. On 7th day, the plate is then re-incubated with 100 μl fresh medium and additional 50 μl of 2,3-Bis-(2-Methoxy-4-Nitro-5-Sulfophenyl)-2 Hydrogen-Tetrazolium-5-Carboxanilide reagent, and further incubated in dark at 37°C for 4 h. After incubation, the orange colored complex formed is read at 450 nm using a microplate reader with a 450 nm reference filter.

Other Outcome Measures:
  1. FMD of the Brachial Artery [ Time Frame: 3 months ]
    FMD in response to reactive hyperemia is measured in the left brachial artery in a quiet, temperature-controlled room after 10 min of bed rest. A high-resolution ultrasound machine equipped with a 7.5 mega Hertz linear array probe is used for the study. Arterial diameters are measured at the baseline and during reactive hyperemia. FMD is calculated as the percentage change in diameter compared with the baseline.

Information from the National Library of Medicine

Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the contacts provided below. For general information, Learn About Clinical Studies.

Layout table for eligibility information
Ages Eligible for Study:   20 Years and older   (Adult, Older Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

Inclusion Criteria: high-risk patients who have at least one of the following situations without pre-existing cardiovascular disease including peripheral artery disease or coronary artery disease:

  • type 2 diabetes mellitus
  • metabolic syndrome
  • stage 3 (or more advanced) chronic kidney disease
  • 2 or more coronary risk factors (male > 45 years or female > 55 years, hypertension, tobacco smoking, hyperlipidemia, family history of cardiovascular disease)

Exclusion Criteria:

  • ankle-brachial index less than 0.9 or more than 1.3 in one or both legs
  • significant stenosis (more than 50% as compared to reference vessel) in peripheral artery on image study
  • symptoms suggesting peripheral artery disease in at least one leg
  • clinical or electrocardiographic evidence of coronary artery disease
  • clinical evidence of cerebrovascular disease
  • severe liver dysfunction (transaminases >10 times of upper normal limit, history of liver cirrhosis, or hepatoma)
  • left ventricular ejection fraction (<50% by echocardiography)
  • documented active malignancy
  • chronic inflammatory disease
  • known drug allergy history for cilostazol
  • current use of cilostazol or any other cAMP-elevator
  • premenopausal women

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT02194686

Layout table for location information
National Cheng Kung University Hospital
Tainan, Taiwan, 704
Sponsors and Collaborators
National Cheng-Kung University Hospital
Department of Health, Executive Yuan, R.O.C. (Taiwan)
Layout table for investigator information
Principal Investigator: Ting-Hsing Chao, MD National Cheng-Kung University Hospital
Publications automatically indexed to this study by ClinicalTrials.gov Identifier (NCT Number):
Layout table for additonal information
Responsible Party: National Cheng-Kung University Hospital
ClinicalTrials.gov Identifier: NCT02194686    
Other Study ID Numbers: B-BR-101-121
NCKUH-10203022 ( Other Grant/Funding Number: NCKUH )
First Posted: July 18, 2014    Key Record Dates
Last Update Posted: October 14, 2015
Last Verified: October 2015
Keywords provided by National Cheng-Kung University Hospital:
progenitor cells
cardiovascular disease
risk factors
biological markers
endothelial function
Additional relevant MeSH terms:
Layout table for MeSH terms
Cardiovascular Diseases
Bronchodilator Agents
Autonomic Agents
Peripheral Nervous System Agents
Physiological Effects of Drugs
Anti-Asthmatic Agents
Respiratory System Agents
Fibrinolytic Agents
Fibrin Modulating Agents
Molecular Mechanisms of Pharmacological Action
Platelet Aggregation Inhibitors
Vasodilator Agents
Neuroprotective Agents
Protective Agents
Phosphodiesterase 3 Inhibitors
Phosphodiesterase Inhibitors
Enzyme Inhibitors