Major Milestones

Eisai in the United States


Eisai Center for Genetics Guided Dementia Discovery to open in spring. Utilizing the insights gained from the AiM Institute, the Center will harness the power of human genetics to develop next-generation medicines for Alzheimer’s disease (AD) and other dementias.

Epochal Precision Anti-Cancer Therapeutics (EPAT) established in Exton, Pa. EPAT focuses on oncology drug development utilizing Eisai’s unique Antibody-Drug Conjugate RESPECT® technology, proprietary payloads, and bispecific antibodies.


Signs strategic collaboration for the worldwide co-development and co-commercialization of cancer agent with Merck & Co., Inc.


Eisai Inc. signed an agreement with Grupo Biotoscana (GBT), granting GBT the exclusive licensing rights to commercialize two oncology and two neurology products throughout most of Latin America. Eisai will continue to retain the rights to the two oncology products in Mexico

Expands existing collaboration agreement with Biogen to develop and commercialize Investigational Alzheimer’s disease treatments


Eisai Andover innovative Medicines (AiM) Institute established to discover biology driven precision medicines


Enter into collaboration with Biogen to develop and commercialize investigational Alzheimer’s disease treatments

Entered into a worldwide collaboration agreement with Purdue Pharma for the clinical development and commercialization of an investigational compound for the treatment of insomnia


Founds H3 Biomedicine to bolster personalized cancer treatment discovery; establishes sales and marketing subsidiaries in Brazil and Mexico


Initiates metabolic franchise; establishes sales and marketing subsidiary in Canada


Acquires MGI Pharma, Inc., including manufacturing facility in Baltimore, Md.


Acquires Morphotek bolster monoclonal antibody development


Starts oncology franchise


Eisai Inc. reaches sales of $2 billion


Achieves product sales of $1 billion

1997 Launches first product (neurology); begins production/packaging operations in US
1996 Introduces field sales force

Eisai Inc. is established as US commercial subsidiary

1987 Eisai creates R&D presence in Andover, Mass.

Eisai Internationally


To learn more about Eisai's global milestones, please click here.