Late-Breaking Clinical Trial Report

Objective: To evaluate the long-term clinical effect of treatment with metreleptin (an analogue of human leptin) on glycemic and lipid abnormalities and markers of hepatic steatosis in patients with inherited or acquired lipodystrophy. Methods: Fifty-five patients (36 with generalized lipo dystrophy and 19 with partial lipodystrophy) with at least 1 of 3 metabolic abnormalities (diabetes mellitus, fasting triglyceride level ≥200 mg/dL, and insulin resistance) and low leptin levels received subcutaneous injections of metreleptin once or twice daily in an ongoing clinical trial at the National Institutes of Health. Results: At baseline, hemoglobin A 1c —8.5% ± 2.1% (mean ± standard deviation [SD])—and triglycerides—479 ± 80 mg/dL (geometric mean ± standard error [SE])—were substantially elevated. Robust and sustained reductions in both variables were evident for the observed patient population during a 3-year metreleptin treatment period (−2.1% ± 0.5% [mean ± SE] and −35.4% ± 13.7% [mean ± SE], respectively). Mean alanine aminotransferase (ALT) and aspartate aminotransferase (AST) levels were elevated at baseline (100 ± 120 U/L and 71 ± 77 U/L [mean ± SD], respectively) and decreased by −45 ± 19 U/L and −33 ± 14 U/L (mean ± SE), respectively, during the 3-year metreleptin treatment period. Improvements in hemoglobin A 1c , triglycerides, ALT, and AST were more pronounced in the subsets of patients having elevated levels at baseline. The most notable adverse events observed in this patient population were likely attributable to underlying metabolic abnormalities or comorbidities. Conclusion: Metreleptin treatment substantially reduced glycemic variables, triglycerides, and liver enzymes (ALT and AST) and demonstrated durability of response throughout a 3-year treatment period. These results support metreleptin as a potential treatment for certain metabolic disorders (for example, diabetes mellitus and hypertriglyceridemia) associated with lipodystrophy. (Endocr Pract. 2011;17:922-932)