Benzinga | Oct 21, 2021 12:10PM EDT

Fusion Pharmaceuticals Announces Presentation Of Preclinical Data Supporting Its FPI-1966 And FPI-2059 Targeted Alpha Therapies

Fusion Pharmaceuticals Inc. (NASDAQ:FUSN), a clinical-stage oncology company focused on developing next-generation radiopharmaceuticals as precision medicines, today announced the presentation of preclinical data that provide further support of its FPI-1966 and FPI-2059 targeted alpha therapies (TATs) at the 34th Annual European Association of Nuclear Medicine Congress. These data reinforce the clinical dosing regimen of FPI-1966 and highlight the potential of FPI-2059 as an actinium-225 labelled precision medicine targeting NTSR1.

"These data demonstrate the broad potential of our TAT platform across multiple validated targets overexpressed in a variety of solid tumors," said Chief Executive Officer John Valliant, Ph.D. "We are pleased to share preclinical efficacy and tumor uptake data resulting from the administration of FPI-1966, and we believe strongly that this data will translate into meaningful results for patients with solid tumors overexpressing FGFR3 -- a population with high unmet medical need. We look forward to initiating the Phase 1 study around the end of this year."

Data from preclinical studies of FPI-1966, a TAT designed to target and deliver actinium-225 to cancer cells expressing FGFR3, were presented in an oral presentation titled, "FGFR3 Targeted Alpha Therapeutic [225Ac]-FPI-1966 induces regression in preclinical bladder xenograft model". Outcomes demonstrated that FPI-1966 when administered with vofatamab results in high tumor delivery and low off-target uptake. Further, the data showed therapeutic efficacy of FPI-1966 at both single and multiple doses in a preclinical bladder cancer xenograft model.

Data from preclinical studies of FPI-2059, a TAT designed to target and deliver actinium-225 to cancer cells expressing neurotensin receptor 1 (NTSR1), were presented in an oral presentation titled "NTSR1 Targeted Alpha Therapeutic [225Ac]-FPI-2059 induces regression in preclinical colorectal xenograft model". The study results include a head-to-head comparison of therapeutic efficacy obtained from FPI-2059, which delivers an alpha emitting isotope, with [177Lu]-IPN-1087, which delivers a beta emitting isotope on the same targeting molecule. Results demonstrate superior efficacy with [225Ac]-FPI-2059 in a mouse xenograft model of colorectal cancer.

Dr. Valliant continued, "Our science is based on the belief that alpha-emitting isotopes can provide significant therapeutic advantages compared to other commonly used radioisotopes. Preclinical results from our FPI-2059 product candidate provide further validation of this belief and support the diversification of our product portfolio to comprise multiple targeting vehicle types, including small molecules. We are pleased to be advancing further preclinical studies of FPI-2059 as we approach an investigational new drug (IND) filing in the first half of 2022."