ImmunoGen and Huadong Medicine Announce Strategic Collaboration to Develop and Commercialize Mirvetuximab Soravtansine in Greater China

Partnership Accelerates Development Path for Mirvetuximab in Greater China and Expands Huadong Medicine’s Oncology Portfolio with Innovative ADC

Combines ImmunoGen’s Lead Clinical Program with Huadong’s Regional Oncology Expertise

ImmunoGen to Receive $40 Million Upfront Payment and is Eligible to Receive Up to $265 Million in Potential Development, Regulatory, and Commercial Milestone Payments

ImmunoGen, Inc. (Nasdaq: IMGN), a leader in the expanding field of antibody-drug conjugates (ADCs) for the treatment of cancer, and Hangzhou Zhongmei Huadong Pharmaceutical Co., Ltd., a wholly-owned subsidiary of Huadong Medicine Co., Ltd., today announced that the companies have entered into an exclusive collaboration to develop and commercialize mirvetuximab soravtansine in mainland China, Hong Kong, Macau, and Taiwan (Greater China). ImmunoGen will retain all rights to mirvetuximab in the rest of the world.

This collaboration provides ImmunoGen with access to the second largest pharmaceutical market in the world via Huadong Medicine’s development, regulatory, and commercial capabilities, while supporting Huadong Medicine’s growth strategy to build a deep portfolio of oncology, endocrinology, and autoimmunology candidates. Mirvetuximab adds a compelling late-stage oncology asset to Huadong Medicine’s portfolio.

“With extensive regional experience, the right development and regulatory capabilities, and access to a deep local network of hospitals and clinics across Greater China, Huadong Medicine is an ideal partner for us,” said Mark Enyedy, ImmunoGen’s President and Chief Executive Officer. “This collaboration reflects mirvetuximab’s potential to deliver meaningful value to ovarian cancer patients as well as our ability to translate our work in ADCs into long-term relationships that create sustainable value for ImmunoGen and our partners. We look forward to working closely with Huadong Medicine to develop and commercialize mirvetuximab in Greater China as we advance the mirvetuximab program and prepare for the first potential commercial launch in the United States in 2022.”

“ImmunoGen is a leader in the development of ADCs for the treatment of cancer and this partnership provides us with a late-stage asset that will enable us to further expand our pipeline of innovative oncology programs,” said Liang Lu, Chairman of Huadong Medicine. “The compelling clinical data generated to date highlights mirvetuximab’s potential to be a promising therapy for an extremely difficult to treat disease and we look forward to beginning its development as we seek to meet the growing needs of ovarian cancer patients in Greater China.”

Under the terms of the agreement, ImmunoGen will receive an upfront payment of $40 million and is eligible to receive additional milestone payments of up to $265 million as certain development, regulatory, and commercial objectives are achieved. ImmunoGen is also eligible to receive low double digit to high teen royalties as a percentage of mirvetuximab commercial sales by Huadong Medicine in Greater China.

Huadong Medicine will be responsible for the development as well as potential regulatory submissions and commercialization of mirvetuximab in Greater China pursuant to input from a joint steering committee comprised of individuals from both companies. Huadong Medicine will also have the opportunity to participate in global clinical studies of mirvetuximab conducted by ImmunoGen. ImmunoGen will continue

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