Try our beta test site
IMPORTANT: Listing of a study on this site does not reflect endorsement by the National Institutes of Health. Talk with a trusted healthcare professional before volunteering for a study. Read more...

Effect of Ezetimibe Plus Simvastatin Versus Simvastatin Alone on Atherosclerosis in the Carotid Artery (ENHANCE)(P02578) (ENHANCE)

This study has been completed.
Information provided by (Responsible Party):
Merck Sharp & Dohme Corp. Identifier:
First received: October 31, 2007
Last updated: April 22, 2015
Last verified: April 2015
The purpose of the study is to determine whether ezetimibe plus simvastatin will be more effective than simvastatin alone in preventing progression of atherosclerosis of the inner layer of the carotid artery.

Condition Intervention Phase
Hyperlipoproteinemia Type II
Drug: ezetimibe (plus simvastatin)
Drug: placebo (plus simvastatin)
Phase 3

Study Type: Interventional
Study Design: Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Double Blind (Participant, Investigator, Outcomes Assessor)
Primary Purpose: Prevention
Official Title: Effect of Combination Ezetimibe and High-Dose Simvastatin vs Simvastatin Alone on the Atherosclerotic Process in Subjects With Heterozygous Familial Hypercholesterolemia (The ENHANCE Trial)

Resource links provided by NLM:

Further study details as provided by Merck Sharp & Dohme Corp.:

Primary Outcome Measures:
  • Change in ultrasound-determined average carotid artery intima-media thickness (IMT) on a per subject basis between baseline and endpoint. [ Time Frame: 24 months ]

Secondary Outcome Measures:
  • Proportion of subjects with a reduction in ultrasound-determined average carotid artery IMT between baseline and endpoint. [ Time Frame: 24 months ]
  • Change in ultrasound-determined maximum carotid artery IMT on a per subject basis between baseline and endpoint. [ Time Frame: 24 months ]
  • Proportion of subjects developing new carotid artery plaques between baseline and endpoint. [ Time Frame: 24 months ]
  • Change in ultrasound-determined average carotid artery plus average common femoral artery IMT on a per subject basis between baseline and endpoint. [ Time Frame: 24 months ]

Enrollment: 720
Study Start Date: June 2002
Study Completion Date: April 2006
Primary Completion Date: April 2006 (Final data collection date for primary outcome measure)
Arms Assigned Interventions
Experimental: EZ/Simva Drug: ezetimibe (plus simvastatin)
oral tablets; ezetimibe 10 mg (plus simvastatin 80 mg) once daily for 24 months
Other Names:
  • SCH 58235
  • SCH 465981
Placebo Comparator: Placebo/Simva Drug: placebo (plus simvastatin)
tablets; placebo to match ezetimibe 10 mg (plus simvastatin 80 mg) once daily for 24 months


Ages Eligible for Study:   30 Years to 75 Years   (Adult, Senior)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

Inclusion Criteria:

  • Genotype-confirmed heterozygous familial hypercholesterolemia with written documentation of the genetic diagnosis at the time of screening and LDL-C >=210 mg/dL (5.43 mmol/L), or clinical diagnosis of heterozygous familial hypercholesterolemia, defined as LDL-C >=210 mg/dL (5.43 mmol/L) and at least one of the following:

    • tendinous xanthoma
    • child <18 years of age with hypercholesterolemia (LDL-C >159 mg/dL (4.11 mmol/L)
    • has a sibling with hypercholesterolemia (LDL-C >190 mg/dL [4.91 mmol/L]) and tendinous xanthoma
    • family history with an LDL-C value distribution pattern compatible with dominant autosomal transmission and at least one relative presenting fasting total cholesterol values >348 mg/dL (9.0 mmol/L) after exclusion of secondary causes of dyslipidemia
  • LDL-C >=210 mg/dL (5.43 mmol/L) 1 week before randomization
  • plasma triglyceride level <=400 mg/dL (4.52 mmol/L)

Exclusion Criteria:

  • pregnancy or any other situation, condition, or illness that, in the opinion of the investigator, may interfere with optimal participation in the study
  • presence of an apolipoprotein B gene mutation with confirmed absence of an LDL receptor mutation in either allele
  • undergoing LDL-apheresis or plasma apheresis
  • unsuitable plaque or artery morphology
  • use of certain drugs, foods, or other agents known to alter cholesterol levels or to cause pharmacokinetic interactions with either ezetimibe or simvastatin
  Contacts and Locations
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, see Learn About Clinical Studies.

No Contacts or Locations Provided
  More Information

Publications automatically indexed to this study by Identifier (NCT Number):
Responsible Party: Merck Sharp & Dohme Corp. Identifier: NCT00552097     History of Changes
Other Study ID Numbers: P02578
Study First Received: October 31, 2007
Last Updated: April 22, 2015

Additional relevant MeSH terms:
Hyperlipoproteinemia Type II
Arterial Occlusive Diseases
Vascular Diseases
Cardiovascular Diseases
Lipid Metabolism Disorders
Metabolic Diseases
Lipid Metabolism, Inborn Errors
Metabolism, Inborn Errors
Genetic Diseases, Inborn
Anticholesteremic Agents
Hypolipidemic Agents
Molecular Mechanisms of Pharmacological Action
Lipid Regulating Agents
Hydroxymethylglutaryl-CoA Reductase Inhibitors
Enzyme Inhibitors processed this record on April 28, 2017