Once Monthly Leqembi for Alzheimer’s Approved

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FDA has approved an Eisai/Biogen supplemental BLA for Leqembi (lecanemab-irmb) and its intravenous use once every four weeks as maintenance dosing in Alzheimer’s disease patients with mild cognitive impairment or mild dementia. “After 18 months of once every two weeks initiation phase, a transition to the maintenance dosing regimen of 10 mg/kg once every four weeks may be considered or the regimen of 10 mg/kg once every two weeks may be continued,” the companies say in a news release.

Approval was based on modeling of observed data from the Phase 2 study (Study 201) and its long-term extension (LTE) as well as the Clarity AD study (Study 301) and its LTE study. “Modeling simulations predict that transitioning to once every four weeks maintenance dosing after 18 months of once every two weeks treatment will maintain clinical and biomarker benefits of therapy,” according to the companies.

Leqembi works by “continuously clearing protofibrils and rapidly clearing plaque,” the companies say. “This is important because with continuous administration, Leqembi clears highly toxic protofibrils which can continue to cause neuronal injury even after the amyloid-beta (Aβ) plaque has been cleared from the brain,” they say. “Protofibrils are believed to contribute to the brain injury that occurs with AD and are considered to be the most toxic form of Aβ, having a primary role in the cognitive decline associated with this progressive, debilitating condition.”

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