Safety and Efficacy Study of Recombinant Human Insulin-Like Growth Factor-I/Recombinant Human Insulin-Like Growth Factor Binding Protein-3 (rhIGF-I/rhIGFBP-3) In Myotonic Dystrophy Type 1

Efficacy Measures: Endurance, Ambulation, Cognitive function, Insulin resistance, Cholesterol and triglycerides, Muscle function and strength, Pain, Gastrointestinal function, Quality of life MINIMUM INCLUSION CRITERIA 1. A diagnosis of DM1, confirmed by DM1 genetic mutation 2. Age 21 to 65 years (inclusive) 3. Ability to walk 30 feet - assistance with cane and/or leg bracing permitted 4. Able to self-administer study medication by subcutaneous injection or caregiver is available to administer study medication