Intra-individual Variability and Circadian Rhythm of VEGF Levels and Interaction With Biomarkers

September 4, 2017 updated by: GWT-TUD GmbH

Intra-individual Variability and Circadian Rhythm of Systemic Vascular Endothelial Growth Factor (VEGF) Levels and Interaction With Biomarkers of Inflammation in Subjects With Normal Glucose Tolerance (NGT) and Patients With Type 2 Diabetes Without Diabetic Macular Edema (DME)

The study evaluates the intra-individual variability of VEGF levels over a period of 6 months as well as the circadian variation of VEGF levels, both under standardized conditions in patients with type 2 diabetes without DME and matched subjects with normal glucose tolerance (NGT). Secondary objectives of the study are to evaluate the relationship of individual VEGF-levels to biomarkers of inflammation, HbA1c and major cardiovascular risk factors.

Study Overview

Status

Status

Indicates the current recruitment status or the expanded access status.
Completed

Conditions

Conditions

The disease, disorder, syndrome, illness, or injury that is being studied. On ClinicalTrials.gov, conditions may also include other health-related issues, such as lifespan, quality of life, and health risks.

Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.

Study Type

Study Type

Describes the nature of a clinical study. Study types include interventional studies (also called clinical trials), observational studies (including patient registries), and expanded access.
Observational

Enrollment (Actual)

Enrollment

The number of participants in a clinical study. The "anticipated" enrollment is the target number of participants that the researchers need for the study.
40

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Locations

  • Germany
      • Dresden, Germany, 01307
        • GWT-TUD GmbH / Studienzentrum Hanefeld

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Eligibility Criteria

The key requirements that people who want to participate in a clinical study must meet or the characteristics they must have. Eligibility criteria consist of both inclusion criteria (which are required for a person to participate in the study) and exclusion criteria (which prevent a person from participating). Types of eligibility criteria include whether a study accepts healthy volunteers, has age or age group requirements, or is limited by sex.

Ages Eligible for Study

50 years to 80 years (Adult, Older Adult)

Accepts Healthy Volunteers

No

Genders Eligible for Study

All

Sampling Method

Probability Sample

Study Population

Community sample of healthy volunteers, type 2 diabetes patients of the study center

Description

Inclusion Criteria:

  • Written informed consent
  • Age equal to or between 50 and 80 years
  • Subjects with normal glucose tolerance confirmed by glucose tolerance test (control group) or patients with type 2 diabetes: diabetes duration 5-25 years; HbA1c equal to or between 6.5 and 9% (diabetes group)
  • Ability to understand and follow study-related instructions

Exclusion Criteria:

  • DME
  • hsCRP > 10 mg/dl
  • Acute infections
  • Acute or chronic inflammatory diseases
  • Immune diseases
  • Treatment with immune suppressive drugs
  • Treatment with glucocorticoids
  • Myocardial infarction and stroke within 1 year before inclusion
  • Hemorrhage within the previous 5 years
  • Surgeries within the previous 3 months
  • Oncological diseases
  • Women who are pregnant or breast-feeding

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Observational Models: Case-Control
  • Time Perspectives: Prospective

Cohorts and Interventions

Group / Cohort

Group / Cohort

A group or subgroup of participants in an observational study that is assessed for biomedical or health outcomes.
Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.
Control group
Subjects with normal glucose tolerance
Other: Frequent blood and urine sampling and blood pressure measurement
Blood and urine sampling for the determination of VEGF and biomarkers
Diabetes group
Patients with type 2 diabetes
Other: Frequent blood and urine sampling and blood pressure measurement
Blood and urine sampling for the determination of VEGF and biomarkers

What is the study measuring?

Primary Outcome Measures

Primary Outcome Measures

In a clinical study's protocol, the planned outcome measure that is the most important for evaluating the effect of an intervention/treatment. Most clinical studies have one primary outcome measure, but some have more than one.
Outcome Measure
Measure Description
Time Frame
VEGF-A
Time Frame: Baseline, month 1, 2, 3, 4, 5 and 6
Plasma levels determined in the morning under fasted conditions
Baseline, month 1, 2, 3, 4, 5 and 6
VEGF-B
Time Frame: Baseline, month 1, 2, 3, 4, 5 and 6
Plasma levels determined in the morning under fasted conditions
Baseline, month 1, 2, 3, 4, 5 and 6
VEGF-C
Time Frame: Baseline, month 1, 2, 3, 4, 5 and 6
Plasma levels determined in the morning under fasted conditions
Baseline, month 1, 2, 3, 4, 5 and 6
Placental growth factor
Time Frame: Baseline, month 1, 2, 3, 4, 5 and 6
Plasma levels determined in the morning under fasted conditions
Baseline, month 1, 2, 3, 4, 5 and 6
VEGF-A
Time Frame: Hourly over 12 hours
Plasma levels determined over the day
Hourly over 12 hours
VEGF-B
Time Frame: Hourly over 12 hours
Plasma levels determined over the day
Hourly over 12 hours
VEGF-C
Time Frame: Hourly over 12 hours
Plasma levels determined over the day
Hourly over 12 hours
Placental growth factor
Time Frame: Hourly over 12 hours
Plasma levels determined over the day
Hourly over 12 hours

Secondary Outcome Measures

Secondary Outcome Measures

In a clinical study's protocol, a planned outcome measure that is not as important as the primary outcome measure for evaluating the effect of an intervention but is still of interest. Most clinical studies have more than one secondary outcome measure.
Outcome Measure
Measure Description
Time Frame
Glycated hemoglobin (HbA1c)
Time Frame: Baseline, month 1, 2, 3, 4, 5 and 6
Plasma levels determined in the morning under fasted conditions
Baseline, month 1, 2, 3, 4, 5 and 6
High-sensitivity C-reactive protein (hCRP)
Time Frame: Baseline, month 1, 2, 3, 4, 5 and 6
Serum levels determined in the morning under fasted conditions
Baseline, month 1, 2, 3, 4, 5 and 6
Matrix metallopeptidase 9 (MMP-9)
Time Frame: Baseline, month 1, 2, 3, 4, 5 and 6
Plasma levels determined in the morning under fasted conditions
Baseline, month 1, 2, 3, 4, 5 and 6
MMP-9
Time Frame: Hourly over 12 hours
Plasma levels determined over the day
Hourly over 12 hours
Adiponectin
Time Frame: Baseline, month 1, 2, 3, 4, 5 and 6
Serum levels determined in the morning under fasted condition
Baseline, month 1, 2, 3, 4, 5 and 6
Adiponectin
Time Frame: Hourly over 12 hours
Serum levels determined over the day
Hourly over 12 hours
Cystatin C
Time Frame: Baseline, month 1, 2, 3, 4, 5 and 6
Serum levels determined in the morning under fasted condition
Baseline, month 1, 2, 3, 4, 5 and 6
Cystatin C
Time Frame: Hourly over 12 hours
Serum levels determined over the day
Hourly over 12 hours
Albumin
Time Frame: Baseline, month 1, 2, 3, 4, 5 and 6
Urine levels determined in the morning under fasted condition
Baseline, month 1, 2, 3, 4, 5 and 6
Creatinine
Time Frame: Baseline, month 1, 2, 3, 4, 5 and 6
Urine levels determined in the morning under fasted condition
Baseline, month 1, 2, 3, 4, 5 and 6
Creatinine
Time Frame: Baseline, month 1, 2, 3, 4, 5 and 6
Serum levels determined in the morning under fasted condition
Baseline, month 1, 2, 3, 4, 5 and 6
Blood pressure
Time Frame: Baseline, month 1, 2, 3, 4, 5 and 6, once over 24 hours
Baseline, month 1, 2, 3, 4, 5 and 6, once over 24 hours

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Sponsor

The organization or person who initiates the study and who has authority and control over the study.
GWT-TUD GmbH

Collaborators

Collaborators

An organization other than the sponsor that provides support for a clinical study. This support may include activities related to funding, design, implementation, data analysis, or reporting.
Novartis

Investigators

Investigators

A researcher involved in a clinical study. Related terms include site principal investigator, site sub-investigator, study chair, study director, and study principal investigator.
  • Principal Investigator: Markolf Hanefeld, Prof. Dr., Study center Prof. Hanefeld, GWT-TUD GmbH

Publications and helpful links

The person responsible for entering information about the study voluntarily provides these publications. These may be about anything related to the study.

General Publications

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start

Study Start

The actual date on which the first participant was enrolled in a clinical study. The "anticipated" study start date is the date that the researchers think will be the study start date.
February 1, 2015

Primary Completion (Actual)

Primary Completion

The date on which the last participant in a clinical study was examined or received an intervention to collect final data for the primary outcome measure. Whether the clinical study ended according to the protocol or was terminated does not affect this date. For clinical studies with more than one primary outcome measure with different completion dates, this term refers to the date on which data collection is completed for all the primary outcome measures. The "anticipated" primary completion date is the date that the researchers think will be the primary completion date for the study.
October 1, 2015

Study Completion (Actual)

Study Completion

The date on which the last participant in a clinical study was examined or received an intervention/treatment to collect final data for the primary outcome measures, secondary outcome measures, and adverse events (that is, the last participant's last visit). The "anticipated" study completion date is the date that the researchers think will be the study completion date.
January 1, 2016

Study Registration Dates

First Submitted

First Submitted

The date on which the study sponsor or investigator first submitted a study record to ClinicalTrials.gov. There is typically a delay of a few days between the first submitted date and the record's availability on ClinicalTrials.gov (the first posted date).
December 19, 2014

First Submitted That Met QC Criteria

First Submitted That Met QC Criteria

The date on which the study sponsor or investigator first submits a study record that is consistent with National Library of Medicine (NLM) quality control (QC) review criteria. The sponsor or investigator may need to revise and submit a study record one or more times before NLM's QC review criteria are met. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
December 19, 2014

First Posted (Estimate)

First Posted

The date on which the study record was first available on ClinicalTrials.gov after National Library of Medicine (NLM) quality control (QC) review has concluded. There is typically a delay of a few days between the date the study sponsor or investigator submitted the study record and the first posted date.
December 24, 2014

Study Record Updates

Last Update Posted (Actual)

Last Update Posted

The most recent date on which changes to a study record were made available on ClinicalTrials.gov. There may be a delay between when the changes were submitted to ClinicalTrials.gov by the study's sponsor or investigator (the last update submitted date) and the last update posted date.
September 6, 2017

Last Update Submitted That Met QC Criteria

Last Update Submitted That Met QC Criteria

The most recent date on which the study sponsor or investigator submitted changes to a study record that are consistent with National Library of Medicine (NLM) quality control (QC) review criteria. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
September 4, 2017

Last Verified

Last Verified

The most recent date on which the study sponsor or investigator confirmed the information about a clinical study on ClinicalTrials.gov as accurate and current. If a study with a recruitment status of recruiting; not yet recruiting; or active, not recruiting has not been confirmed within the past 2 years, the study's recruitment status is shown as unknown.
September 1, 2017

More Information

Terms related to this study

Additional Relevant MeSH Terms

Other Study ID Numbers

Other Study ID Numbers

Identifiers or ID numbers other than the NCT number that are assigned to a clinical study by the study's sponsor, funders, or others. These numbers may include unique identifiers from other trial registries and National Institutes of Health grant numbers.
  • VEGF Bio

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

Studies a U.S. FDA-regulated device product

No

product manufactured in and exported from the U.S.

No

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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