FDA Delays Lilly Alzheimer’s Drug for Panel Review
FDA is continuing to slow roll its review decision on Eli Lilly’s experimental Alzheimer’s drug donanemab by requiring the agency’s Peripheral and Central Nervous System Drugs Advisory Committee to discuss the company’s Phase 3 TRAILBLAZER-ALZ 2 trial, which evaluated the efficacy and safety of donanemab in early symptomatic Alzheimer's disease. FDA wants to “further understand topics related to evaluating the safety and efficacy of donanemab, including the safety results in donanemab-treated patients and the efficacy implications of the unique trial design of the TRAILBLAZER-ALZ 2 study, including its limited-duration dosing regimen that allowed patients to complete treatment based on an assessment of amyloid plaque and the inclusion of participants based on tau levels,” Lilly says.
In November, Lilly said the FDA review decision had been pushed back to the first quarter of 2024. It had previously expected an agency decision by 12/31. In an 11/2 earnings call, Lilly said FDA asked for more time to evaluate data in the donanemab submission. A date of the advisory committee meeting has not yet been set by the agency, and as a result, the timing of an agency review decision “will be delayed beyond the first quarter of 2024,” the company says.
In July, the company announced full results from the Phase 3 TRAILBLAZER-ALZ 2 study showing that donanemab significantly slowed cognitive and functional decline in people with early symptomatic Alzheimer’s disease (AD). The data were published 7/17 online in the Journal of the American Medical Association. The full results confirmed previously reported data (see earlier story) showing that in study “participants with low-medium levels of tau [protein neurofibrillary tangles] (n=1182), donanemab treatment significantly slowed decline by 35% on iADRS [integrated Alzheimer's Disease Rating Scale] and 36% on CDR-SB [Clinical Dementia Rating-Sum of Boxes],” according to Lilly. “Among all amyloid-positive early symptomatic AD study participants (n=1736), treatment with donanemab significantly slowed decline by 22% on iADRS and 29% on CDR-SB.”
Lilly says donanemab specifically targets deposited amyloid plaque and has been shown to lead to plaque clearance in treated patients. The therapy “significantly reduced amyloid plaque levels regardless of baseline pathological stage of disease,” it said. “Among all participants, treatment with donanemab reduced amyloid plaque on average by 84% at 18 months, compared with a 1% decrease for participants on placebo. Participants were able to stop taking donanemab once they achieved pre-defined criteria of amyloid plaque clearance.”