Novartis has agreed to acquire Anthos Therapeutics, Inc., a Boston-based, privately held, clinical-stage biopharmaceutical company with abelacimab, a late-stage medicine in development for the prevention of stroke and systemic embolism in patients with atrial fibrillation.

Under the terms of the agreement, Novartis will make an upfront payment of $925 million upon closing of the transaction, subject to certain customary adjustments, and potential additional payments of up to $2.15 billion upon achievement of specified regulatory and sales milestones. The transaction is expected to close in the first half of 2025, subject to the satisfaction of customary closing conditions.

The transaction is fully in line with Novartis’ growth strategy and therapeutic area focus, leveraging the company’s strength and expertise in the cardiovascular area.

Anthos Therapeutics, launched by Blackstone Life Sciences and Novartis in 2019, has advanced abelacimab through clinical development under a license from Novartis. Abelacimab is a novel, highly selective, fully human monoclonal antibody designed to induce effective hemostasis-sparing anticoagulation through Factor XI inhibition. Phase 2 data showed a significant reduction in bleeding events in patients taking abelacimab versus a standard of care direct-oral anticoagulant in patients with atrial fibrillation. Three Phase 3 clinical trials are ongoing for patients at risk of arterial and venous clots, one in patients with atrial fibrillation and two in cancer associated thrombosis.

“We are excited to join forces to advance the development of abelacimab, a potential first-in-class treatment and safer approach for stroke prevention in atrial fibrillation as well as cancer-associated thrombosis,” said Shreeram Aradhye, M.D., President, Development and Chief Medical Officer, Novartis.

In July 2022 abelacimab received a Fast Track Designation from the FDA for the treatment of thrombosis associated with cancer. In September 2022 abelacimab was also granted a Fast Track Designation for the prevention of stroke and systemic embolism in patients with atrial fibrillation.

“Abelacimab is a potential first-in-class medicine, which promises to be an effective and safer approach to preventing thrombosis and stroke than the current standards of care,” said David Soergel, M.D., Global Head, Cardiovascular, Renal and Metabolism Development Unit, Novartis. “We are proud that this medicine originated at Novartis and have been impressed with the Anthos Therapeutics team’s expertise and dedication and with the great progress they have made on the program. Now is the right time to bring abelacimab back into the Novartis CRM pipeline.”

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