Compassionate Use of Metreleptin in Previously Treated People With Generalized Lipodystrophy

Leptin is an adipocyte-derived hormone that can be thought of as a signal from adipose tissue to the rest of the body conveying information about long-term nutritional status. Patients with the very rare condition of generalized lipodystrophy have leptin deficiency secondary to lack of adipose tissue. The combination of leptin deficiency and ectopic lipid deposition in patients with lipodystrophy leads to metabolic complications including severe insulin resistance and diabetes, hypertriglyceridemia, nonalcoholic steatohepatitis, and polycystic ovarian syndrome. Between 2000 and 2014, the NIDDK IRP conducted an open-label clinical trial of the recombinant human leptin analog, metreleptin, in patients with generalized and partial forms of lipodystrophy. This study showed that metreleptin ameliorates metabolic and endocrine abnormalities in lipodystrophy, including reducing food intake, improving insulin resistance and diabetes, reducing ectopic lipid, and normalizing reproduction. Based on these data, metreleptin was approved by the FDA in February, 2014, for patients with generalized, but not partial, lipodystrophy.

Currently, metreleptin is not available as an approved drug outside the US and Japan, and it is available on a compassionate use basis only in a few additional countries. The purpose of this study is twofold:

• To provide access to metreleptin to patients with generalized lipodystrophy, including those who have previously received metreleptin through NIH studies (protocols 02-DK-0022 and 13-DK- 0057) AND/OR who cannot obtain metreleptin through approved or compassionate use mechanisms in their home country
• To continue to collect data on the long-term efficacy of metreleptin in ameliorating the metabolic complications of generalized lipodystrophy.

Metreleptin will be given at doses of less than or equal to 0.24 mg/kg/day, adjusted based on body weight and metabolic control. Patients will be seen approximately once per year at NIH for evaluation, and potentially less frequently for those who are medically stable and have difficulty traveling to the US. Laboratory evaluation will be obtained more frequently by the patient s home providers as clinically indicated. The primary outcomes of the study are improvements in serum triglycerides and hemoglobin A1c levels. Secondary outcomes include measures of steatohepatitis and ectopic lipid, body composition, bone mineral density and bone mineral metabolism, and pituitary and reproductive function.

Metreleptin is supplied by Chiesi USA, Inc.. Neither the NIH nor Chiesi USA, Inc. can guarantee that leptin will be available for these patients indefinitely and/or after the study ends.

• INCLUSION CRITERIA:

• Age greater than or equal to 6 months.
• Generalized lipodystrophy (either congenital or acquired).
• Those who cannot obtain metreleptin through approved or compassionate use mechanisms in their home country.

Exclusion criteria

• Availability of metreleptin to the patient either as an approved drug, or through local compassionate use or expanded access programs.
• Known HIV infection or HIV-associated lipodystrophy.
• Any medical condition or medication that will increase risk to the subject.
• Current alcohol or substance abuse.
• Subjects who have a known hypersensitivity to E. coli derived proteins (as leptin is derived from such proteins).