Five Prime Therapeutics Initiates Patient Dosing in a Phase 1 Clinical Trial of FPT155
Five Prime Therapeutics announced it initiated patient dosing in a Phase 1 clinical trial of FPT155, a first-in-class CD80 fusion protein. The trial was initiated in Australia.
“We are pleased to initiate patient dosing for FPT155, our first-in-class CD80-Fc fusion protein, which is engineered to activate T cells through multiple pathways,” said Helen Collins, M.D., Senior Vice President and Chief Medical Officer of Five Prime. “In vivo, FPT155 demonstrates strong single-agent activity in multiple preclinical models, including some that are generally resistant to immune-modulating therapy. We look forward to testing FPT155 in the clinic to see if it has the potential to improve outcomes across multiple tumor indications where new treatment options are needed.”
“FPT155 is further evidence of Five Prime executing on the strategy of leveraging our IND engine as a source of competitive advantage in developing first-in-class agents that have the potential to demonstrate single-agent activity or activity in tumors that typically do not respond to checkpoint inhibitors,” said Aron Knickerbocker, Chief Executive Officer of Five Prime Therapeutics. “Beyond FPT155, this strategy can be seen across our robust pipeline, including with cabiralizumab, bemarituzumab and FPA150. These drug candidates target or engage multiple cells in the tumor microenvironment, including tumor cells, effector T cells, macrophages and NK cells.”
The Phase 1a/1b open-label, multicenter, dose escalation, dose exploration and dose expansion study will evaluate the safety and tolerability of FPT155 in patients with advanced solid tumors. The Phase 1a dose escalation portion of the trial will characterize the safety and pharmacokinetic (PK)/pharmacodynamic (PD) profile of FPT155 and will identify a recommended dose for the Phase 1b portion of the trial. During the dose escalation, Five Prime will also open an exploratory cohort to investigate FPT155 monotherapy in select tumor types with high unmet need. The Phase 1b portion of the trial is intended to further characterize the safety, PK/PD profile, and preliminary efficacy of FPT155.