Self-reported treatment-associated symptoms among patients with urea cycle disorders participating in glycerol phenylbutyrate clinical trials.
Molecular genetics and metabolism
Adolescent, Adult, Aged, Ammonia, Antineoplastic Agents, Child, Child, Preschool, Female, Glycerol, Humans, Infant, Male, Middle Aged, Phenylbutyrates, Quality of Life, Self Report, Surveys and Questionnaires, Urea Cycle Disorders, Inborn, Young Adult
BACKGROUND: Health care outcomes have been increasingly assessed through health-related quality of life (HRQoL) measures. While the introduction of nitrogen-scavenging medications has improved survival in patients with urea cycle disorders (UCDs), they are often associated with side effects that may affect patient compliance and outcomes.
METHODS: Symptoms commonly associated with nitrogen-scavenging medications were evaluated in 100 adult and pediatric participants using a non-validated UCD-specific questionnaire. Patients or their caregivers responded to a pre-defined list of symptoms known to be associated with the use of these medications. Responses were collected at baseline (while patients were receiving sodium phenylbutyrate [NaPBA]) and during treatment with glycerol phenylbutyrate (GPB).
RESULTS: After 3 months of GPB dosing, there were significant reductions in the proportion of patients with treatment-associated symptoms (69% vs. 46%; p
CONCLUSIONS: The reduction in symptoms following 3 months of open-label GPB dosing was similar in pediatric and adult patients and may be related to chemical structure and intrinsic characteristics of the product rather than its effect on ammonia control.
Nagamani, Sandesh C S; Diaz, George A; Rhead, William; Berry, Susan A; Le Mons, Cynthia; Lichter-Konecki, Uta; Bartley, James; Feigenbaum, Annette; Schulze, Andreas; Longo, Nicola; Berquist, William; Gallagher, Renata; Bartholomew, Dennis; Harding, Cary O; Korson, Mark S; McCandless, Shawn E; Smith, Wendy; Vockley, Jerry; Kronn, David; Zori, Robert; Cederbaum, Stephen; Merritt, J Lawrence; Wong, Derek; Coakley, Dion F; Scharschmidt, Bruce F; Dickinson, Klara; Marino, Miguel; Lee, Brendan H; and Mokhtarani, Masoud, "Self-reported treatment-associated symptoms among patients with urea cycle disorders participating in glycerol phenylbutyrate clinical trials." (2015). Maine Medical Center. 388.