Pfizer's PARP Inhibitor Talazoparib Gets FDA Priority Review and EMA Submission

June 7, 2018

Pfizer Inc. (NYSE:PFE) announced on 6/7/2018 that the U.S. Food and Drug Administration accepted for filing and granted Priority Review designation to the company’s New Drug Application for talazoparib. The submission is based on results from the EMBRACA trial, which evaluated talazoparib versus chemotherapy in patients with germline (inherited) BRCA-mutated (gBRCAm), HER2-negative locally advanced or metastatic breast cancer (MBC). Talazoparib is an investigational, once-daily, oral poly ADP ribose polymerase (PARP) inhibitor. The European Medicines Agency has also accepted the Marketing Authorization Application for talazoparib in this patient population.

“Women with a hereditary BRCA mutation are typically diagnosed with breast cancer at a younger age than the overall breast cancer population and have limited treatment options when they develop advanced disease,” said Mace Rothenberg, M.D., chief development officer, Oncology, Pfizer Global Product Development. “Today’s filing acceptances are just the latest example of the success of Pfizer’s precision medicine approach to drug development, in this case targeting the faulty DNA damage repair process associated with BRCA mutations. We are now one step closer to offering a potential alternative to chemotherapy for these patients.”

Talazoparib is an investigational anti-cancer medicine called a PARP (poly ADP ribose polymerase) inhibitor. Preclinical studies suggest that talazoparib is highly potent and has a dual mechanism of action, with the potential to induce tumor cell death by blocking PARP enzyme activity and trapping PARP on the sites of DNA damage. Talazoparib is currently being evaluated in advanced gBRCAm breast cancer and early triple negative breast cancer as well as DNA damage repair (DDR)-deficient prostate cancer and in combination with immunotherapy in various solid tumor types.

In a previous study, talazoparib significantly increased progression free survival times over physicians' choice therapies. The median PFS was 8.6 months with talazoparib and 5.6 months with physician’s choice.

Acceptance for an NDA by the FDA triggered a milestone payment of $20 million to BioMarin Pharmaceutical.



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