On February 19, 2019 Fusion Pharmaceuticals, a biopharmaceutical company focused on radiotherapeutics (specifically, targeted alpha therapeutics), reported that the first patient was dosed in a Phase 1, first-in-human clinical trial of lead product candidate [225Ac]-FPI-1434 in patients with advanced solid tumors (Press release, Fusion Pharmaceuticals, FEB 19, 2019, View Source [SID1234533468]).
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"The entire Fusion team takes tremendous pride in having developed a new targeted alpha therapeutic and in moving it from the discovery phase to a clinical trial," said John Valliant, Ph.D., Founder and Chief Executive Officer of Fusion Pharmaceuticals. "We are excited to start clinical development of a new generation of radiopharmaceuticals utilizing our Fast-ClearTM Linker to address the need for better cancer treatments."
The Phase 1 clinical study (FPX-01-01) is a dose-escalation study that will characterize the safety and tolerability of a single dose [225Ac]-FPI-1434 Injection in patients with advanced solid tumors. [225Ac]-FPI-1434 is a targeted alpha radioimmunoconjugate that consists of a humanized monoclonal antibody targeting the insulin-like growth factor-1 receptor 1 (IGF-1R), Fusion’s Fast-ClearTM Linker, a bifunctional chelate, and actinium-225. Patients will be screened for target expression with the imaging agent [111In]-FPI-1547. [111In]-FPI-1547 contains the same targeting antibody, Linker, and bifunctional chelate as the [225Ac]-FPI-1434 therapeutic form, however it will contain indium-111 in place of actinium-225. Only those patients who have IGF-1R expression will be receiving the [225Ac]-FPI-1434 therapeutic radioimmunoconjugate. Investigators will evaluate the safety and tolerability of a targeted alpha-emitting radiotherapeutic. Up to 30 patients will be treated and followed for safety and for signs of efficacy. For more information about this study, visit: View Source
About Fusion’s Fast-Clear Technology Platform and FPI-1434
Fusion uses its proprietary Fast-Clear Technology Platform to convert molecules into radiopharmaceuticals. Fast-ClearTM linkers promote increased clearance of radoisotopes – the linkers are engineered to improve the safety of radiopharmaceuticals without impacting efficacy. The predecessor [225Ac]-FPI-1434 antibody (AVE1642) is a humanized antibody against IGF-1R (insulin-like growth factor receptor) that had previously been in Phase I and II clinical trials. Fusion has an exclusive license to AVE1642 from ImmunoGen, Inc. Fusion applied its Fast-Clear linker to convert AVE1642 into a potent radiopharmaceutical, [225Ac]-FPI-1434.