Sapropterin in Individuals With Phenylketonuria

Completed

Conditions studied: Phenylketonuria

In brief

Investigators at Washington University will examine the effects of sapropterin (Kuvan) on brain and cognition in individuals with phenylketonuria (PKU) using neuropsychological and neuroimaging procedures. Sapropterin is a medication developed by BioMarin Pharmaceutical Inc. that is approved by the FDA for treatment of patients with PKU to reduce phenylalanine (Phe) levels. Patients beginning treatment with sapropterin as standard clinical care will be enrolled in the study. As a first step, patients with PKU will receive baseline neuropsychological and neuroimaging evaluations 1 day prior to beginning treatment with sapropterin. Screening for response to sapropterin will occur over 4 weeks. At the end of 4 weeks, response to sapropterin will be reviewed. Patients with a reduction of ≥ 20% in blood Phe (i.e., responders) will receive follow-up neuropsychological and neuroimaging evaluations after 6 months of treatment with sapropterin. Patients (both responders and nonresponders) will receive long-term follow-up neuropsychological and neuroimaging evaluations 3 to 5 years after initial enrollment in the study. The focus of neuropsychological testing will be executive abilities, as these abilities are particularly susceptible to disruption in individuals with PKU. We hypothesize that improvements in these abilities will occur following treatment with sapropterin. For neuroimaging assessments, structural magnetic resonance imaging (MRI) will permit evaluation of changes in the structure and volume of the gray and white matter of the brain, whereas diffusion tensor imaging (DTI) will permit evaluation of microstructural white matter integrity.

Key facts

Study ID

NCT00730080

Run by

Washington University School of Medicine

People needed

45

Starts

2008-07-01

Expected to finish

2018-05-01

Last updated by the study team

2018-06-18

Who can join

Age: 6 and older, up to 50. Sex: any. Healthy volunteers: accepted.

You may qualify if…

• Willing and able to provide informed consent or assent.
• Willing and able to comply with study procedures.
• Greater than or equal to 6 years of age.
• For phenylketonuria,intention of physician to prescribe sapropoterin.
• For phenylketonuria,phenylalanine level greater than or equal to 450μmol/L.
• For phenylketonuria, negative pregnancy test if of childbearing potential.
• For phenylketonuria, willing to use contraception if sexually active.

You may not qualify if…

• Pregnant, breastfeeding, or planning to become pregnant during study.
• Use of investigational product less than 30 days prior to or during study.
• Concurrent condition that could interfere with participation or safety.
• Any condition creating high risk of poor compliance with study.
• Perceived to be unreliable or unavailable for study.
• Use of L-Dopa, methotrexate, or other drugs that inhibit folate metabolism.
• For phenylketonuria, known hypersensitivity to sapropterin or excipients.

Where it is running

• Washington University — St Louis, Missouri, United States

Full record on ClinicalTrials.gov

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