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TOKYO and CAMBRIDGE, Mass., November 20, 2023 ¨C Eisai Co., Ltd. (Headquarters: Tokyo, CEO: Haruo Naito, ¡°Eisai¡±) and Biogen Inc. (Nasdaq: BIIB, Corporate headquarters: Cambridge, Massachusetts, CEO: Christopher A. Viehbacher, ¡°Biogen¡±) announced today that Alzheimer¡¯s disease (AD) treatment LEQEMBI? (lecanemab-irmb) was awarded both the Best New Drug and Clinical Advance of the Year for the Phase III Clarity AD study at the Scrip Awards 2023, held by Citeline (Headquarters: New York).

Eisai Co., Ltd. (Headquarters: Tokyo, CEO: Haruo Naito, ¡°Eisai¡±) announced today that it has been named by the Japan Investor Relations Association (Chairman: Naoki Izumiya, ¡°JIRA¡±) as one of the ¡°Greatest IR Improvement Premium Company¡± and ¡°Best Continual IR Efforts Premium Company¡± at the JIRA 30th Anniversary Commemorative Awards.

Eisai Co. Ltd (Headquarters: Tokyo, CEO: Haruo Naito, ¡°Eisai¡±) announced today that TIME has selected Alzheimer¡¯s disease (AD) treatment LEQEMBI? (lecanemab-irmb) as one of THE BEST INVENTIONS of 2023 in the Medical Care category.

Update on LEQEMBI Investigational Subcutaneous Formulation

Eisai Co., Ltd. (Headquarters: Tokyo, CEO: Haruo Naito, ¡°Eisai¡±) announced today the presentation of research across various types of cancer from its oncology portfolio and pipeline during the European Society for Medical Oncology (ESMO) Congress 2023, which is taking place virtually and in-person in Madrid, Spain from October 20 to 24.

TOKYO and CAMBRIDGE, Mass., September 25, 2023 ¨C Eisai Co., Ltd. (Headquarters: Tokyo, CEO: Haruo Naito, ¡°Eisai¡±) and Biogen Inc. (Nasdaq: BIIB, Corporate headquarters: Cambridge, Massachusetts, CEO: Christopher A. Viehbacher, ¡°Biogen¡±) announced today that humanized anti- soluble aggregated amyloid-beta (A¦Â) monoclonal antibody ¡°LEQEMBI? Intravenous Infusion¡± (200 mg, 500mg, lecanemab) has been approved in Japan as a treatment for slowing progression of mild cognitive impairment (MCI) and mild dementia due to Alzheimer¡¯s disease (AD).

Eisai Co., Ltd. (Headquarters: Tokyo, CEO: Haruo Naito, ¡°Eisai¡±) announced today that it has established a digital business company Theoria technologies Co., Ltd. (¡°Theoria technologies¡±) which will accelerate the development of a dementia ecosystem. Theoria technologies is a wholly owned subsidiary of Eisai.

Eisai Co., Ltd. (Headquarters: Tokyo) and Biogen Inc. (Headquarters: Cambridge, Massachusetts) announced the following joint statement regarding today¡¯s recommendation by Japan¡¯s First Committee on New Drugs of the Pharmaceutical Affairs and Food Sanitation Council of the Ministry of Health, Labour and Welfare that the manufacturing and marketing authorization application for lecanemab (product names: Leqembi 200 mg for intravenous infusion and Leqembi 500 mg for intravenous infusion) should be approved.

Eisai Co., Ltd. (Headquarters: Tokyo, CEO: Haruo Naito, ¡°Eisai¡±) announced today that it has been included in the FTSE4Good Index Series for the 22nd?consecutive year since its initial inclusion in 2002. The FTSE4Good Index Series is a global index series for socially responsible investment.

Eisai Co. Ltd (Headquarters: Tokyo, CEO: Haruo Naito, ¡°Eisai¡±) announced today that the company will present the latest findings on its Alzheimer¡¯s disease (AD) pipeline and research, including Eisai¡¯s anti-amyloid beta (A¦Â) protofibril* antibody for the treatment of Alzheimer¡¯s disease (AD), lecanemab (generic name, U.S. brand name: LEQEMBI?), and the company¡¯s investigational anti-MTBR** tau antibody, E2814, at the Alzheimer¡¯s Association International Conference (AAIC). The conference will be held in Amsterdam, the Netherlands and virtually from July 16 to 20, 2023. Eisai will present data and research in eight oral and 19 poster presentations at the meeting. Two of the AAIC oral presentations will be presented as posters at the Alzheimer¡¯s Disease Imaging Consortium (AIC), which will be held at the same venue as AAIC on July 15.