Study of Cholesterol Levels and Types in African Americans With Type 2 Diabetes (LAAD)

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. Identifier: NCT01494298
Recruitment Status : Completed
First Posted : December 16, 2011
Results First Posted : December 13, 2013
Last Update Posted : December 13, 2013
Merck Sharp & Dohme Corp.
Emory University
Celera Genomics
Information provided by (Responsible Party):
Gina J. Ryan, Mercer University

Brief Summary:

Compared to other races, African-Americans with type 2 diabetes have different cholesterol levels, specifically triglycerides and low density lipoprotein. Recent data has shown the not only are cholesterol levels important in determining the risk for cardiovascular disease, but the size of the cholesterol particles and surface proteins on the cholesterol particles are also important. The objective of this study is to determine if African-American males with diabetes have different particle size, surface proteins, and cholesterol genetic links than African-American male without diabetes and Caucasian-American males with and without diabetes.

African-American males with type 2 diabetes and not taking lipid-lowering medications are the current target population.

After obtaining an informed consent, a complete medical history will be obtained and subjects will be examined, noninvasively, for physical signs of elevated cholesterol levels. Afterwards, blood samples [one venous puncture, 6 tubes (21 mL total)] will be obtained. Blood samples will be coded, sent to Berkeley Heart Lab and/or Clinical Laboratory Services, and undergo genetic testing at Mercer University College of Pharmacy and Health Sciences.

Confidentiality of the subjects will be explained in the consenting process to the subjects. All subject samples and information will be coded. Each subject will be given a subject number upon consenting and this will be used throughout the study. All pertinent information of the subjects will be listed under the designated number, but will not be associated with that patient.

Condition or disease
Type 2 Diabetes African American Cholesterol Lipoprotein Apolipoprotein

Study Type : Observational
Actual Enrollment : 111 participants
Observational Model: Cohort
Time Perspective: Prospective
Official Title: Preliminary Analysis of Lipoprotein Subclasses, Apoprotein Levels, and Genetic Architecture of African-American Males With Type 2 Diabetes. Lipids in African Americans With Type 2 Diabetes
Study Start Date : December 2011
Actual Primary Completion Date : March 2013
Actual Study Completion Date : March 2013

African-American men with type 2 diabetes who are not taking cholesterol-lowering medications.
African-American men without type 2 diabetes who are not taking cholesterol-lowering medications.

Primary Outcome Measures :
  1. ApoB Levels in African American Men With Diabetes and Those Without. [ Time Frame: At study entry ]
    Apolipoprotein B Age adjusted least square means are reported because of baseline differences in ages.

Secondary Outcome Measures :
  1. LDL Density in African American Males With Diabetes and Those Without Diabetes [ Time Frame: at entry ]

    LDL size subclassification was divided into the following groups (from largest size to smallest size): LDL I, LDL IIa, LDL IIb, LDL IIIa, LDL IIIb, LDL IVa, LDL IVa, and LDL IVb.

    For differences posted P<0.05 for LDL I, LDL IIb, LDL IIIa, and LDL IIIa +b

  2. Lipoprotein a [Lp(a)] in African Americans With Diabetes and Without. [ Time Frame: at study entry ]

Biospecimen Retention:   Samples With DNA
We will retain a sample of serum, plasma and whole blood.

Information from the National Library of Medicine

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Ages Eligible for Study:   18 Years to 79 Years   (Adult, Older Adult)
Sexes Eligible for Study:   Male
Accepts Healthy Volunteers:   No
Sampling Method:   Probability Sample
Study Population
This is a cross-sectional epidemiologic study in which the lipoprotein subclasses, apolipoprotein levels, and genetic polymorphisms of African-American men with type 2 diabetes will be compared to African-American men without diabetes.

Inclusion Criteria:

  • Male
  • African American by self-report
  • Subjects will be defined as having diabetes if they are diagnosed with diabetes per the American Diabetes Association guidelines
  • Subjects without diabetes or impaired glucose tolerance will have a fasting blood glucose <100 mg/dL and/or glycosylated hemoglobin(A1C) <6.5%.

Exclusion Criteria:

  • Females
  • Self report of race or ethnicity other than African
  • Currently taking any lipid-lowering medications

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 identifier (NCT number): NCT01494298

United States, Georgia
Grady Health System
Atlanta, Georgia, United States, 30303
Mercer Univeristy College of Pharmacy and Health Sciences
Atlanta, Georgia, United States, 30341
Sponsors and Collaborators
Mercer University
Merck Sharp & Dohme Corp.
Emory University
Celera Genomics

Responsible Party: Gina J. Ryan, Clinical Associate Professor, Mercer University Identifier: NCT01494298     History of Changes
Other Study ID Numbers: H1105110
First Posted: December 16, 2011    Key Record Dates
Results First Posted: December 13, 2013
Last Update Posted: December 13, 2013
Last Verified: October 2013

Keywords provided by Gina J. Ryan, Mercer University:
Type 2 diabetes
African American

Additional relevant MeSH terms:
Diabetes Mellitus
Diabetes Mellitus, Type 2
Glucose Metabolism Disorders
Metabolic Diseases
Endocrine System Diseases