Acadia Gets 2nd Complete Response on Alzheimer's Drug
FDA has issued Acadia Pharmaceuticals a second complete response letter on its supplemental NDA for Nuplazid (pimavanserin) for treating hallucinations and delusions associated with Alzheimer’s disease psychosis (ADP). The letter recommended the company conduct an additional trial in ADP. “While the FDA stated that Study 019 demonstrated a statistically significant treatment effect on its primary endpoint, they concluded that there are limitations in the interpretability of the 019 results,” the company says. “The FDA also stated that the positive treatment effect of pimavanserin on dementia-related psychosis in Study 045 (HARMONY) appeared to be driven by the robustly positive results in the Parkinson’s disease dementia subgroup, a condition they stated is subsumed within the currently approved Nuplazid Parkinson’s disease psychosis (PDP) indication. Up to 50% of PDP patients have dementia.”
In June, FDA’s Psychopharmacologic Drugs Advisory Committee voted 9-3 to not recommend approval of the sNDA. The panel members did not find the company’s data sufficient to approve the drug in this patient population, with some recommending a randomized study in Alzheimer’s patients. Acadia had studied the drug in Parkinson’s and Alzheimer’s patients with psychosis, but some panel members suggested the Parkinson’s patients may have skewed results.
FDA 4/2021 issued Acadia a complete response letter (see story) on an earlier sNDA, indicating that the submission could not be approved in its then-present form. At the time, the agency cited a lack of statistical significance in some of the subgroups of dementia, and insufficient numbers of patients with certain less-common dementia subtypes as lack of substantial evidence of effectiveness to support approval, according to the company.