Eisai and Biogen have commenced a rolling submission of a biologics license application (BLA) to the US Food and Drug Administration (FDA) for the experimental drug, lecanemab (BAN2401), to treat early Alzheimer’s disease (early AD).

lecanemab was developed by the partnership between Eisai and BioArctic and is an investigational, humanised anti-amyloid beta (Aβ) protofibril monoclonal antibody (mAb) for AD.

Discover B2B Marketing That Performs

Combine business intelligence and editorial excellence to reach engaged professionals across 36 leading media platforms.

Find out more

The mAb attaches to neutralise and remove soluble, toxic Aβ aggregates or protofibril believed to cause the AD neurodegenerative process.

Eisai is submitting the BLA under the accelerated approval pathway.

The BLA is chiefly based on clinical, biomarker and safety results from the Phase IIb Study 201 in early AD patients and established amyloid pathology.

An increased degree of Aβ plaque reduction and a consistent decrease of clinical decline across various clinical goals were reported in the trial.

GlobalData Strategic Intelligence

US Tariffs are shifting - will you react or anticipate?

Don’t let policy changes catch you off guard. Stay proactive with real-time data and expert analysis.

By GlobalData

The correlation between the extent of Aβ plaque reduction and effect on clinical endpoints in Study 201 further supports Aβ as a surrogate endpoint that is reasonably likely to predict clinical benefit.

The US FDA granted breakthrough therapy designation to lecanemab for AD treatment in June.

Eisai has an agreement with the FDA to submit the BLA for lecanemab on a rolling basis.

This agreement permits the completed parts of the application to be submitted to the FDA for review on an ongoing basis.

On submitting all portions to the FDA, the regulatory agency accepts the BLA and will set the Prescription Drug User Fee Act (PDUFA) action date.

Biogen CEO Michel Vounatsos said: “The rolling submission of lecanemab for FDA review under the accelerated pathway is a positive step toward that goal

“We believe that treatments directed at amyloid beta reduction in the brain have the potential to transform diagnosis and treatment of Alzheimer’s disease.”

A serious and progressive disease, AD has a reduced number of treatment options.

Pharmaceutical Technology Excellence Awards - Nominations Closed

Nominations are now closed for the Pharmaceutical Technology Excellence Awards. A big thanks to all the organisations that entered – your response has been outstanding, showcasing exceptional innovation, leadership, and impact.

Excellence in Action
NorthWest EHealth has won three 2025 Pharmaceutical Technology Excellence Awards for Innovation, Safety and Diversity. Explore how its ConneXon platform is transforming SAE reporting and real-time safety oversight, while FARSITE delivers socio-economically inclusive recruitment to boost trial efficiency, data integrity and regulatory-grade representativeness.

Discover the Impact