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Approximately 100 subjects will be enrolled into the trial. Subjects will be randomized to one of two groups in a 2:1 ratio. The larger group (approximately 66 subjects) will be treated by intramuscular injection of 60 mg of SB-509 (30 mg of SB-509 per leg) into the lower limb every 2 months. The remaining group (approximately 33 subjects) will receive an equal volume of placebo on the same schedule. Each subject will receive a total of three treatments (Day 0, 60 and 120). Subjects will receive injections in a distribution pattern that targets the major peripheral nerves in the legs and feet.
The symptoms of diabetic peripheral neuropathy and any changes
that occur during the trial will be evaluated based on neurological
examination data, electrophysiological testing data, subject
neurological questionnaire, and subject pain assessment.
Specifically, investigators will use the following tests: the
visual analog scale for pain intensity (VASPI), total neuropathy
score (TNS) to assess signs and symptoms of the condition. A
composite scoring system is widely regarded by neurologists as the
most comprehensive approach to evaluating changes in nerve health.
In addition to qualitative assessment of symptoms, the TNS includes
electrophysiological testing using nerve conduction velocity (NCV)
to assess the rate at which a nerve can conduct an electrical
signal, and quantitative sensory testing (QST) with the Vibratron
II instrument, to assess the threshold of detection of vibration.
In addition, skin biopsies will be taken to evaluate the direct
therapeutic effect of SB-509 on nerve regrowth. This test is a very
sensitive marker of DN severity and may provide an important
mechanistic marker fo
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