SAN RAFAEL, Calif., Feb. 19, 2013 (GLOBE NEWSWIRE) -- BioMarin Pharmaceutical Inc. (Nasdaq:BMRN) announced today results from the PKU-016 ASCEND study, the largest randomized controlled trial evaluating neuropsychiatric outcomes in phenylketonuria (PKU) patients treated with the approved drug Kuvan (sapropterin dihydrochloride). The study evaluated medically important symptoms similar to attention deficit hyperactivity disorder (ADHD) in PKU patients whose blood levels of phenylalanine (Phe) are reduced by Kuvan. The primary endpoint of the study was evaluated using an attention deficit hyperactivity rating scale (ADHD-RS), commonly used to evaluate symptoms of inattentiveness and hyperactivity. Kuvan improved the ADHD-RS (p=0.085), driven by a statistically significant change in the inattention component of the score (p=0.036). PKU patients have a lower degree of hyperactivity as compared to ADHD patients, which likely resulted in the less prominent benefits in this domain. The neurocognitive benefit of Kuvan in patients who respond to Kuvan was corroborated by the Behavior Rating Inventory of Executive Function, or BRIEF, in children who were rated by their parents. Moderate to severe inattention deficit affected approximately one-third of patients in the study. Preliminary analysis of safety indicates that it is consistent with the general experience with Kuvan. "We are encouraged to see the positive trend in the predetermined ADHD primary endpoint, which was driven by a statistically significant change in the sub-domain of inattentiveness," said Hank Fuchs, M.D., Chief Medical Officer of BioMarin. "We believe these results will provide useful information to the medical community on clinically relevant benefits of Kuvan and facilitate adoption of the product. Further, the results will help inform the design of the Phase 3 PEG-PAL program with key learnings about the measurement tools. We are encouraged by the results and plan to discuss the submission of this data with the FDA for possible inclusion in the Kuvan label." In addition to the ADHD-RS and BRIEF instruments, other exploratory tests in the PKU-016 study of neuropsychiatric deficit in PKU patients demonstrated a higher level of impairment in PKU patients than the normal population. Further analyses are underway to complete the evaluation of Kuvan on these outcome measures.
Dr. Robert Hendren, Professor and Vice Chair of Psychiatry and Director of Child and Adolescent Psychiatry at the University of California, San Francisco commented, "These data document what has been known by PKU clinicians for a long time; namely, mental health impairment is a prevalent and important problem affecting PKU patients and that improved control of their metabolic condition translates into improved control of the impairment in mental health."Abstracts will be submitted to the International Congress of Inborn Errors of Metabolism (ICIEM) and American Society of Human Genetics (ASHG) meetings this fall. Study Design PKU-016 is a double-blind, placebo-controlled, randomized study to evaluate the safety and therapeutic effects of Kuvan on neuropsychiatric symptoms in subjects with PKU. The study enrolled 206 patients, 118 of whom are responders to Kuvan as determined by a drop in blood Phe levels. The study includes a two-week screening period, a 13-week double-blind randomized treatment period and a 13-week open-label treatment period at a dose of 20 mg/kg/day. The Attention Deficit Hyperactivity Disorder Rating Scale (ADHD-RS) is an instrument for assessing treatment response in patients who do not have metabolic disorders causing inattention and hyperactivity. The scale has been widely used to evaluate therapies approved for ADHD in patients without metabolic brain disease. Because inattention observed in PKU patients is similar in clinical presentation, the ADHD-RS was used to measure outcomes. The Behavior Rating Inventory of Executive Function (BRIEF) rating scale is an instrument to assess executive function behaviors. The 86-item questionnaire forms a Global Executive Composite, which is comprised of two indices: Behavioral Regulation and Metacognition and eight sub-domains exploring specific deficits in executive functioning.
|All patients (N)||108||98||Total= 206|
|Kuvan responders (N)||57||61||Total =118|
|ADHD-like Kuvan responders (N)||19||19||Total = 38|
|Change from baseline ADHD-RS||-5.4||-9.5||Difference = -4.1 (in favor of Kuvan) p=0.085, Kuvan versus placebo|
|Change from baseline inattentiveness domain||-2.6||-6.0||Difference -3.4 (in favor of Kuvan) p=0.036, Kuvan versus placebo|
BioMarin®, Naglazyme®, Kuvan® and Firdapse™ are registered trademarks of BioMarin Pharmaceutical Inc.Aldurazyme® is a registered trademark of BioMarin/Genzyme LLC.
CONTACT: Investors: Eugenia Shen BioMarin Pharmaceutical Inc. (415) 506-6570 Media: Debra Charlesworth BioMarin Pharmaceutical Inc. (415) 455-7451