HAMILTON, Canada and BOSTON, MA, USA I May 6, 2021 I Fusion Pharmaceuticals Inc. (Nasdaq: FUSN), a clinical-stage oncology company focused on developing next-generation radiopharmaceuticals as precision medicines, today announced that it has entered into a clinical trial collaboration with a subsidiary of Merck (known as MSD outside the U.S. and Canada) to evaluate Fusion’s lead candidate, [225Ac]-FPI-1434 (FPI-1434), in combination with Merck’s anti-PD-1 (programmed death receptor-1) therapy, KEYTRUDA® (pembrolizumab), in patients with solid tumors expressing insulin-like growth factor 1 receptor (IGF-1R).

“With our strong preclinical data demonstrating promising activity with FPI-1434 and immuno-oncology agents, we believe we have an opportunity to improve efficacy in tumor indications where KEYTRUDA is approved, and to potentially expand into new tumor indications,” said Chief Executive Officer John Valliant, Ph.D. “This collaboration with Merck builds off our research on the mechanism of action of alpha radiation and aligns with our goal to expand the utility of radiopharmaceutical therapies, including advancing into earlier lines of cancer therapy.”

The planned Phase 1/2 combination trial will evaluate safety, tolerability and pharmacokinetics of FPI-1434 in combination with pembrolizumab and is expected to initiate approximately six to nine months after achieving the recommended Phase 2 dose in the ongoing Phase 1 study of FPI-1434 monotherapy. Under the terms of the agreement, Fusion will sponsor the study and Merck will supply KEYTRUDA.

KEYTRUDA® is a registered trademark of Merck Sharp & Dohme Corp., a subsidiary of Merck & Co., Inc., Kenilworth, NJ, USA.

About FPI-1434
FPI-1434 is a radioimmunoconjugate designed to target and deliver alpha emitting medical isotopes to cancer cells expressing IGF-1R, a receptor that is overexpressed on many tumor types. FPI-1434 utilizes Fusion’s Fast-Clear linker to connect a human monoclonal antibody that targets IGF-1R with actinium-225, a powerful alpha-emitting isotope with desirable half-life and decay chain properties.

About Fusion
Fusion Pharmaceuticals is a clinical-stage oncology company focused on developing next-generation radiopharmaceuticals as precision medicines. Employing a proprietary Fast-Clear linker technology, Fusion connects alpha particle emitting isotopes to antibodies and other targeting molecules in order to selectively deliver the alpha emitting payloads to tumors. Fusion’s lead program, FPI-1434, is currently in a Phase 1 clinical trial.

SOURCE: Fusion Pharmaceuticals