EISAI TO PRESENT FULL FINDINGS FROM LECANEMAB CONFIRMATORY PHASE 3 CLINICAL TRIAL (CLARITY AD) AND OTHER ALZHEIMER’S DISEASE RESEARCH AT THE 15TH CLINICAL TRIALS ON ALZHEIMER’S DISEASE (CTAD) CONFERENCE – QNT Press Release

TOKYO, Nov. 20, 2022 /PRNewswire/ — Eisai Co., Ltd. (Headquarters: TokyoCEO: Haruo Naito“Eisai”) will present the efficacy, safety and biomarker findings from the company’s Phase 3 confirmatory Clarity AD clinical trial for lecanemab (development code: BAN2401), an investigational anti-amyloid beta (Aβ) protofibril antibody for the potential ld treatment of mi cognitive impairment (MCI) due to Alzheimer’s disease (AD) and mild AD (collectively known as early AD) with confirmed presence of amyloid pathology in the brain, at the 15th Clinical Trials on Alzheimer’s Disease (CTAD) conference. At the meeting, which will be held in San Francisco, CA and virtually from November 29 to December 2Eisai and esteemed faculty will present the full data in a scientific session on the first day of the meeting (November 29 at 4:50 p.m. PT). Additionally, other important research from the lecanemab clinical development program and Eisai’s AD pipeline, including the company’s investigative anti-microtubule binding region (MTBR) tau antibody (E2814), will be presented in four oral and ten poster presentations.

Topline results from Clarity AD were announced in late September and showed that lecanemab met the primary endpoint and all key secondary endpoints with highly statistically significant results, and the profile of Amyloid-Related Imaging Abnormalities (ARIA) incidence was within expectations.

Key Eisai Lecanemab CTAD Presentations

• Clarity AD: Full results from the Phase 3 confirmatory Clarity AD clinical trial of lecanemab in patients with early AD will be presented in a scientific session on November 29 at 4:50 p.m. PT. Eisai will host a live webcast of presentations in the session and can be viewed live on the investors section of the Eisai Co., Ltd. website.
• Aβ Protofibrils Binding Properties: Research studying the characterization of Aβ protofibrils and the unique binding properties and mechanisms of Aβ clearance of lecanemab (Poster #P029)
• AHEAD 3-45 Study:
• An evaluation of tau PET screening data from the Phase 3 AHEAD 3-45 study of lecanemab for associations with plasma p-tau217 and cognitive testing (Late Breaker Oral #LB1)
• A study exploring increased accuracy of amyloid PET prediction in preclinical AD using plasma levels for Abeta42/40 and p-tau217 ratios from the Phase 3 screening data from the AHEAD 3-45 study (Late Breaker Oral #LB2)

“Based on the Clarity AD results, the investigational anti-amyloid beta protofibril antibody lecanemab has the potential to make a clinically meaningful difference for people living with the early stages of Alzheimer’s disease and their families by slowing cognitive and functional” Lynn KramerMD, Chief Clinical Officer, Alzheimer’s Disease and Brain Health at Eisai Co., Ltd. “Eisai is excited to share the results of the company’s confirmatory Phase 3 Clarity AD clinical study at CTAD and present important data exploring lecanemab’s potential safety efficacy, use in a variety of early AD patient sub-populations.”

Eisai aims to file for traditional approval in the US and for marketing authorization applications in Japan and Europe by the end of Eisai’s FY2022, which ends March 31, 2023.In July 2022the US Food and Drug Administration (FDA) accepted Eisai’s Biologics License Application (BLA) for lecanemab under the accelerated approval pathway and granted it Priority Review. The Prescription Drug User Fee Act (PDUFA) action date is January 6, 2023. The FDA has agreed that the results of Clarity AD can serve as the confirmatory study to verify the clinical benefit of lecanemab. In an effort to secure traditional FDA approval for lecanemab as soon as possible, Eisai submitted the BLA through the FDA’s val Accelerated Appro so that the agency could complete its review of all lecanemab data with the exception of the data from the confirmatory Clarity AD study. In March 2022Eisai began submitting application data, with the exception of Clarity AD data, to Japan’s Pharmaceuticals and Medical Devices Agency (PMDA) under the prior assessment consultation system, with the aim of obtaining early approval for lecanemab so that people living with early AD may have access to the therapy as soon as possible.

CTAD 2022 Presentations Relating to Eisai’s Key Compounds, Research and Collaborations

Oral Presentations

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