A Phase 3, Open-Label Study of the Safety of HPN-100 for the Long-Term Treatment of Urea Cycle Disorders (Treat UCD)
This was a long-term safety study HPN-100 in urea cycle disorder (UCD) subjects. Subjects were assessed regularly for safety and control of their venous ammonia. Hyperammonemic events were characterized with respect to contributing factors, such as intercurrent illness, diet, and noncompliance with medication.
• Male and female subjects who completed HPN-100-006:
• \*Additionally, approximately 20 UCD subjects ≥ 6 years of age may be enrolled who have not participated in HPN-100-006. These subjects may include those who did not qualify HPN-100-006 (e.g., subjects between the ages of 6-17 years, subjects with other UCD subtypes, or adult subjects who have not taken sodium phenylbutyrate (NaPBA) in the past 6 months, etc.). For adult subjects not receiving NaPBA in the past 6 months, subjects must, in the judgment of the investigator, be anticipated to benefit from the addition of a nitrogen-scavenging agent to their current treatment. Clinical evidence of potential benefit from introduction of an ammonia-scavenging agent might include a recent history (in the past year) of clinically overt hyperammonemia accompanied by a venous ammonia ≥ 100 μmol/L, a recent history (within the past year) of protein intolerance, or a history of abnormally high venous ammonia levels accompanied by symptoms (e.g., headache) that might reasonably be attributed to hyperammonemia.
• Signed informed consent by subject and/or subject's legally acceptable representative.
• Diagnosis of urea cycle disorder (enzyme or transporter deficiency) confirmed via enzymatic, biochemical, or genetic testing.
• Able to perform and comply with study activities, including blood draws.
• Negative pregnancy test for all females of childbearing potential.
• All females of childbearing potential and all sexually active males must agree to use an acceptable method of contraception throughout the study.