Hyperion enrolls first patient in HPN-100 investigational compound clinical trial

Hyperion Therapeutics today announced that the first patient has been enrolled in a clinical trial of investigational compound HPN-100 (glycerol phenylbutyrate) in children ages 6-17 with urea cycle disorders (UCD). The study will evaluate the safety, tolerability, and ammonia control of glycerol phenylbutyrate compared to BUPHENYL^® (sodium phenylbutyrate). The 2-3 week trial will enroll ten children currently treated with sodium phenylbutyrate for their UCD and will be followed by a one year open-label safety extension. The pivotal efficacy study in adult UCD patients will be conducted in parallel beginning later this year.