Zymeworks is pleased to announce, along with our partners Jazz Pharmaceuticals, that the U.S. Food and Drug Administration (FDA) has accepted and granted Priority Review of the Biologics License Application (BLA) for zanidatamab, the human epidermal growth factor receptor 2 (HER2)-targeted bispecific antibody, for the treatment of previously treated, unresectable, locally advanced, or metastatic HER2-positive biliary tract cancer (BTC). Under the Prescription Drug User Fee Act (PDUFA), FDA has set a target action date of November 29, 2024.
“The priority review designation for zanidatamab underscores the critical need for new treatment options for patients with locally advanced or metastatic HER2-positive BTC, a devastating disease with a poor prognosis,” said Rob Iannone, M.D., M.S.C.E., executive vice president, global head of research and development of Jazz Pharmaceuticals. “Upon approval, zanidatamab will be the first HER2-targeted treatment specifically indicated for these patients, and we look forward to the opportunity to deliver this new treatment option to the BTC community.”
Jazz’s BLA submission is based on results from Cohort 1 of the Phase 2b HERIZON-BTC-01 clinical trial (NCT05152147) of zanidatamab in previously treated patients with unresectable, locally advanced, or metastatic HER2-positive BTC (defined as in situ hybridization [ISH] positive and immunohistochemistry [IHC] 2+ or 3+). The trial demonstrated a primary endpoint of 41.3% [95% confidence interval (CI): 30.4, 52.8] confirmed objective response rate (cORR) by independent central review (ICR) and results were presented at the American Society of Clinical Oncology (ASCO) Annual Meeting 2023, published in The Lancet Oncology, and included in the 2023 Best of ASCO® program. Overall survival, updated duration of response and additional long-term follow-up data from the Phase 2b HERIZON-BTC-01 trial will be presented at the upcoming ASCO Annual Meeting 2024.
Additionally, the global, open-label, randomized HERIZON-BTC-302 Phase 3 trial (NCT06282575) to evaluate the efficacy and safety of zanidatamab in combination with standard-of-care therapy against standard-of-care therapy alone in first-line advanced or metastatic HER2-positive BTC is ongoing and is open for enrollment. HERIZON-BTC-302 is expected to serve as the confirmatory trial for zanidatamab in BTC.
About Zanidatamab
Zanidatamab is an investigational HER2-targeted bispecific antibody that can simultaneously bind two non-overlapping epitopes of the HER2 receptor, known as biparatopic binding. This unique design and increased binding results in multiple mechanisms of action, including dual HER2 signal blockade, removal of HER2 protein from the cell surface, and immune-mediated cytotoxicity leading to encouraging antitumor activity in patients. Zanidatamab is being developed in multiple clinical trials as a targeted treatment option for patients with solid tumors that express HER2. Zanidatamab is being developed by Jazz and BeiGene, Ltd. (BeiGene) under license agreements from Zymeworks, which first developed the molecule.
The U.S. Food and Drug Administration (FDA) has granted Breakthrough Therapy designation for zanidatamab development in patients with previously treated HER2 gene-amplified biliary tract cancers (BTC), and two Fast Track designations for zanidatamab: one as a single agent for refractory BTC and one in combination with standard of care chemotherapy for 1L gastroesophageal adenocarcinoma (GEA). Additionally, zanidatamab has received Orphan Drug designations from FDA for the treatment of BTC and GEA, as well as Orphan Drug designation from the European Medicines Agency for the treatment of BTC and gastric cancer. Zanidatamab was also granted Breakthrough Therapy designation from the Center for Drug Evaluation (CDE) in China.
About Biliary Tract Cancer
BTC, including gallbladder cancer and intrahepatic and extrahepatic cholangiocarcinoma, account for <1% of all adult cancers globally and are often associated with a poor prognosis1,2. The human epidermal growth factor receptor 2 (HER2) is a well-validated target for antitumor therapy in other cancers. Across the U.S., Europe, and Japan, approximately 12,000 people are diagnosed with HER2+ BTC annually3,4,5,6.
Read the full press release here.
References:
1 Valle JW, et al. Lancet 2021; 397:428-44
2 Siegel RL, et al. CA Cancer J Clin 2022; 72;7-33
3 BTC overall diagnosed patients as per SEER 22
4 Assumes anatomic subsites intrahepatic CCA, extrahepatic CCA, gallbladder cancer, and BTC unspecified
5 Assumes HER2 positivity rates per anatomical subsite from: Galdy, S., Lamarca, A., McNamara, M.G. et al. Cancer Metastasis Rev 36, 141–157 (2017), Nobuyoshi Hiraoka, et al. Human Pathology, Volume 105, 2020, Pages 9-19
6 Major markets: U.K, France, Germany, Spain, Italy. Note: HER2+ BTC patients in Jazz-controlled commercial territories, which includes Japan, and excludes other certain Asia Pacific countries licensed to BeiGene, Ltd
