NorthStar Medical Isotopes will supply Bayer with the medical radioisotope actinium-225 (Ac-225).
Under the terms of the deal, NorthStar will provide Bayer with non-carrier-added Ac-225 to be used by Bayer for several of its radiopharmaceutical programs. Ac-225 is a high-energy alpha-emitting radioisotope used in clinical trials to deliver therapeutic doses of radiation to destroy cancer cells in patients.
The radioisotope will be produced at a new dedicated Ac-225 production facility at NorthStar's Beloit, WI, campus, with the first shipments planned in 2024.
![A 53-year-old patient (patient number four) with a recurrent pituitary adenoma with extension of a cystic component of disease to the medial temporal lobe apparent on MRI (contoured in blue), and extension of disease to the left sphenoid bone and orbital apex apparent on [68Ga]Ga-DOTA-TATE (contoured in yellow).](https://img.auntminnie.com/mindful/smg/workspaces/default/uploads/2026/04/pituitary-tumor.QGsEnyB4bU.jpg?auto=format%2Ccompress&dpr=2&fit=crop&h=167&q=70&w=250)
