On January 3, 2018 Five Prime Therapeutics, Inc. (Nasdaq:FPRX), a biotechnology company discovering and developing innovative immuno-oncology protein therapeutics, reported the December 2017 submission of an Investigational New Drug (IND) application for FPA150, a first-in-class immuno-oncology antibody that targets B7-H4 (Press release, Five Prime Therapeutics, JAN 3, 2018, View Source [SID1234522850]). Five Prime discovered FPA150 using the company’s protein therapeutics platform and anticipates initiating a Phase 1 trial of FPA150 during the first half of 2018.
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FPA150 is a high affinity, afucosylated monoclonal antibody designed with a dual mechanism of action: blocking a T cell checkpoint pathway and delivering enhanced antibody-dependent cell-mediated cytotoxicity (ADCC) against tumor cells expressing B7-H4. B7-H4 expression is seen in tumor types such as breast, ovarian and endometrial cancer, and has been correlated with poor prognosis in some studies. Non-clinical data of FPA150 featured in an oral poster presentation at the European Society for Medical Oncology (ESMO) (Free ESMO Whitepaper) 2017 Congress described potent ADCC and T cell checkpoint blockade activity in vitro and significant dose-dependent anti-tumor efficacy in vivo.
"We are excited to expand our clinical pipeline with the addition of FPA150, which offers a differentiated approach to existing immunotherapies," said Bryan Irving, Ph.D., Senior Vice President of Research at Five Prime. "B7-H4 represents a T cell checkpoint ligand that is not currently targeted by other immuno-oncology agents and is also expressed in several solid tumor types not typically associated with elevated PD-L1 expression."
Five Prime designed the planned Phase 1 trial with a standard 3+3 dose escalation phase in patients with solid tumors, followed by dose expansion in pre-specified cohorts in tumor types based on B7-H4 expression levels. The initial targeted tumors are advanced or metastatic breast, ovarian, endometrial and urothelial carcinomas. Phase 1a dose escalation endpoints include identification of a maximum tolerated dose (MTD), safety, and pharmacokinetics (PK) of FPA150. Phase 1b dose expansion endpoints include objective response rate, as well as safety and PK.
About FPA150
FPA150 is a novel, high affinity, afucosylated monoclonal antibody discovered by Five Prime with its protein therapeutics platform. FPA150 is designed with a dual mechanism of action: blocking a T cell checkpoint pathway and delivering enhanced antibody-dependent cell-mediated cytotoxicity against tumor cells expressing B7-H4. B7-H4 expression is seen in tumor types such as breast, ovarian and endometrial cancer, and has been correlated with poor prognosis in some studies. Five Prime anticipates initiating Phase 1 development of FPA150 during the first half of 2018.