Merck & Co signs deal with Dr Falk Pharma for MAb

4 November 2025

US pharma giant Merck & Co (NYSE: MRK), known as MSD outside of the USA and Canada, today announced that the company, through subsidiary Prometheus BioSciences, has reached an agreement with Germany’s Dr Falk Pharma GmbH to discontinue an existing contract concerning co-development and co-commercialization rights in certain territories for MK-8690 (formerly PRA-052).

Instead, Merck will assume full responsibility for the development program going forward. MK-8690 is an investigational anti-CD30 ligand monoclonal antibody (MAb) being evaluated by Merck in an early-stage clinical trial.

Under the terms of the accord, Prometheus BioSciences and Falk have discontinued their collaboration based on their existing co-development contract resulting in Prometheus having secured global rights to MK-8690.

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