Clinical Trial of SB-509 in Subjects With Diabetic Neuropathy

Study Overview
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Brief Summary
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The purpose of the study is to study the clinical effects of the investigational drug, SB-509 versus placebo in patients with diabetic neuropathy.

Detailed Description
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SB-509 contains the gene (DNA-a kind of biological blueprint) for a protein. When a researcher injects SB-509 into your legs, the drug enters the muscle and nerve cells around the injection site and causes these cells to make a protein. This protein causes your cells to increase production of another protein called vascular endothelial growth factor (VEGF), which may improve the structure and function of nerves. In addition, there are changes in the levels of 28 additional proteins in your cells. These proteins function to promote the growth of cells, are structures in cells, help synthesize products, and affect immune cells, and some have unknown functions. This increase in your own VEGF proteins may protect and repair the damaged nerves caused by diabetic neuropathy.

Official Title
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A Phase 2 Repeat Dosing Clinical Trial of SB-509 in Subjects With Moderate to Severe Diabetic Neuropathy and Unmeasurable Nerve Conduction Velocity

Conditions
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Diabetes Mellitus, Type 1, Diabetes Mellitus, Type 2, Diabetic Polyneuropathy

Intervention / Treatment
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* Biological: SB-509
* Other: Placebo


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Key Inclusion Criteria: Have a clinical diagnosis of diabetes mellitus type I or II for at least 12 months prior to the study. Have received a diagnosis of moderate to severe sensorimotor diabetic neuropathy from a neurologist (a doctor who specializes in disorders of the nervous system) or endocrinologist (a doctor who specializes in diabetes). This type of neuropathy is a loss of sensation and muscle function that occurs in the legs and hands in a stocking and glove distribution. Subjects with diabetic neuropathy that results in loss of sensation or muscle function in only one nerve and results in loss of nerve function of the blood vessels and causes low blood pressure, will not be eligible. Unmeasurable nerve conduction velocity in any lower extremity nerve: peroneal, tibial or sural due to diabetic polyneuropathy If female and of childbearing potential, agree to use a medically acceptable physical barrier method during the study. Have blood pressure < 140/90 mm Hg Body mass index (BMI) < 38 kg/m2 Key Exclusion Criteria: Subjects with the following are NOT eligible to participate in this study: Have moderate to severe ischemic heart disease, any history of congestive heart failure, or have had a myocardial infarction (heart attack) within the previous 6 months. Have chronic foot or leg ulcers for >1 month, gangrene in the legs, or any previous amputation of the lower extremity. Have a history of cancer within the past 5 years (except for curable non-melanoma cancer of the skin, superficial bladder cancer in complete remission, or any other cancer that has been in complete remission for at least 5 years). Have colon polyps. If patients have a history of benign colonic polyps that have been removed, they must have evidence of a normal colonoscopy within the last 12 months. Require any drug that depresses patients' immune systems (such as methotrexate, cyclophosphamide, or cyclosporine) when they receive the study drug and for 30 days afterwards. Have a known disorder that affects patients' immune systems (such as HIV/AIDS, hepatitis B virus [HBV], hepatitis C virus [HCV], sarcoidosis, tuberculosis, rheumatoid arthritis, or autoimmune disorders).

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 70 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Treatment
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Single


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: 1<br>SB-509 | Biological: SB-509<br>* 60 mg dose<br>|
| Placebo Comparator: 2<br> | Other: Placebo<br>* Saline<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Total Neuropathy Score (TNS),Evoked nerve conduction velocity (NCV), Quantitative Sensory Testing (QST), %of subjects with conversion of unmeasurable to measurable NCV and NIS-LL |  | One year | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Safety |  | One year | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Diabetic neuropathy, Diabetes Type 1 or 2, Moderate to severe sensorimotor diabetic polyneuropathy, Unmeasurable nerve conduction velocity