Predictive Markers of Glitazone Efficacy in Diabetic Patients - Pilot Study
Study Details
Study Description
Brief Summary
Hypothesis:
A cluster of biochemical measurements (biomarkers) predict which diabetic patients will respond to treatment with a therapeutic dose of rosiglitazone over a 12 week treatment period.
Brief Summary:
The purpose of this study is to assess the predictive value of the biomarkers in diabetic patients treated with a full dose of a thiazolidinedione (eg 4mg bid rosiglitazone) for 12 weeks.
Specifically - the questions asked are:
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Do baseline measurements of a selected panel of biomarkers predict the patients' response to rosiglitazone over 12 weeks?
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How does the panel of biomarkers change over that 12 week treatment period?
| Condition or Disease | Intervention/Treatment | Phase |
|---|---|---|
Detailed Description
Rosiglitazone (Avandia) is a medicine used to treat type 2 diabetes. It works by increasing the sensitivity of body tissues to insulin.
This pilot study will examine the possibility that baseline biochemistry might predict the response to rosiglitazone. The study will be conducted in males and the biomarkers of interest measured by specific assays. In addition, since the biomarkers to be measured come from body fat, interpretation of the data would be facilitated by accurate measurements of changes in body fat mass during treatment and these data can be obtained from Echo-MRI scans.
Study Design
Arms and Interventions
| Arm | Intervention/Treatment |
|---|---|
| 1 Rosiglitazone |
Drug: Rosiglitazone
Rosiglitazone 4mg od, increased to 4mg bg at 4 weeks if HbA1C above 7%.
|
| 2 Diet control +/- metformin |
Outcome Measures
Primary Outcome Measures
- The performance of baseline biochemical biomarkers in plasma and urine in distinguishing patients who respond to rosiglitazone from those that do not, as classified by a change in HbA1C at 12 weeks. [12 weeks]
Secondary Outcome Measures
- Variability in baseline levels of key biochemical markers in diabetic patients. [12 weeks]
- Effect of treatment on a variety of other novel potential predictive biomarkers and markers of insulin sensitisation in diabetic patients. [12 weeks]
Eligibility Criteria
Criteria
Inclusion Criteria:
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Male subjects aged 18 to 65 years.
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Eligible subjects must be free from clinically significant illness or disease (other than type 2 diabetes)with the exception of chronic stable-treated hypertension (BP<160/90, and >90/50), thyroid disease (TSH in the normal reference range) and/or dyslipidaemia.
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BMI must be > or = 25kg/m2 to < or = 40kg/m2,
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HbA1c between 7and 10%, fasting blood glucose above 7mmol/L (fasting means greater or = 8 hours prior to screening).
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On diet alone or diet plus metformin (GSK data indicate that the latter group more faithfully reflect the behaviour of 'naive' patients than those who have been washed off prior medications)for at least 1 month.
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On stable doses of anti-hypertensive medication, thyroid hormone replacement and statin therapy as required.
Exclusion Criteria:
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Prior treatment with thiazolidinedione, insulin or GLP-1 analogue (Byetta)
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History of hepatic disease, impairment or abnormal liver function test i.e. AST, ALT>2 times upper limit of normal range (ULN), bilirubin>1.5 time ULN.
History of renal disease or serum creatinine greater than 1.5 X ULN.
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Contraindications to rosiglitazone treatment.
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Serum creatinine greater than 1.5 X upper limit of normal range.
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Any other clinically significant laboratory abnormality.
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Claustrophobic or other contraindication to MRI scan
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Females of child-bearing age who are unwilling to use appropriate methods of contraception.
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Unable to give informed consent.
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Unable to comply with study protocol.
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Clinically significant co-morbidity. -
Contacts and Locations
Locations
| Site | City | State | Country | Postal Code | |
|---|---|---|---|---|---|
| 1 | Addenbrooke's Hospital | Cambridge | United Kingdom | CB2 2GG | |
| 2 | Ealing Hospital | London | United Kingdom | UB1 3HW | |
| 3 | Imperial College London - Hammersmith Campus | London | United Kingdom | W12 ONN | |
| 4 | Charing Cross Hospital | London | United Kingdom | W6 8RF |
Sponsors and Collaborators
- Imperial College London
- GlaxoSmithKline
Investigators
- Principal Investigator: Martin R Wilkins, MD FRCP, Imperial College London
Study Documents (Full-Text)
None provided.More Information
Publications
None provided.- cro700