Biovail Reveals Results from Acadia's Phase III Trial of Pimavanserin in Parkinson's Disease Psychosis

In a release, the Company noted:

The study did not meet its primary endpoint of antipsychotic efficacy as measured using the Scale for the Assessment of Positive Symptoms, or SAPS. Pimavanserin met the key secondary endpoint of motoric tolerability as measured using the Unified Parkinson's Disease Rating Scale, or UPDRS. Pimavanserin was safe and well tolerated, with the frequency of adverse events generally similar between the pimavanserin and placebo arms.

The primary endpoint of the study was the mean change in SAPS scores at day 42 compared to baseline for each of the two pimavanserin treatment arms versus placebo. Patients showed marked improvements in the SAPS scores across all study arms (mean reductions in SAPS scores were 5.9 points in the placebo arm, 5.8 points in the 10 mg pimavanserin arm, and 6.7 points in the 40 mg pimavanserin arm); however, statistical significance was not achieved in either pimavanserin arm primarily due to the larger than expected improvement in placebo-treated patients.

"We're clearly disappointed with the results, but such setbacks are not uncommon in the industry and are a reminder that we need to continue to build our pipeline with promising compounds," said Biovail CEO Bill Wells. "We will analyze the data in conjunction with Acadia over the next several weeks before deciding on next steps."

Trial Design

The Phase III trial was a multi-center, double-blind, placebo-controlled study designed to evaluate the safety and efficacy of pimavanserin in patients with PDP. A total of 298 patients were enrolled in the trial and randomized to one of three study arms, including two different doses of pimavanserin (10 mg or 40 mg) and placebo. Patients received oral doses of either pimavanserin or placebo once daily for six weeks. Patients remained on stable doses of their existing anti-Parkinson's therapy throughout the study. The primary endpoint was antipsychotic efficacy as measured using the hallucinations and delusions domains of the SAPS. The key secondary endpoint was motoric tolerability as measured using Parts II and III of the UPDRS.

About Pimavanserin

Pimavanserin is a 5-HT2A receptor inverse agonist in Phase III development as a treatment for Parkinson's disease psychosis. This new chemical entity, which was discovered by Acadia, is a small molecule that can be taken orally as a tablet once-a-day. Acadia and Biovail have formed a collaboration to co-develop and commercialize pimavanserin for neurological and psychiatric indications, including Parkinson's disease psychosis (PDP) and Alzheimer's disease psychosis (ADP), in the United States and Canada. Acadia retains rights to pimavanserin in the rest of the world.

About Parkinson's Disease Psychosis

According to the National Parkinson Foundation, over 1.5 million people in the United States suffer from Parkinson's disease. Up to 40 percent of patients with Parkinson's disease may develop psychotic symptoms, commonly consisting of visual hallucinations and delusions. Currently there is no therapy in the United States approved to treat PDP. The development of psychosis in patients with Parkinson's disease is associated with increased caregiver burden, nursing home placement, and increased mortality.

Biovail Corp. is a specialty pharmaceutical company engaged in the formulation, clinical testing, registration, manufacture, and commercialization of pharmaceutical products.

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