Zymeworks' Lead Asset, ZW25, Granted Fast Track Designation from the FDA

Zymeworks Inc. (NYSE/TSX: ZYME), a clinical-stage biopharmaceutical company developing multifunctional biotherapeutics, today announced that the U.S. Food and Drug Administration (FDA) has granted Fast Track designation to ZW25, a novel Azymetric bispecific antibody, for the first-line treatment of patients with HER2-overexpressing gastroesophageal adenocarcinoma in combination with standard of care chemotherapy.

“Receipt of Fast Track designation from the FDA emphasizes the large unmet need of patients with these types of HER2-expressing cancers,” said Ali Tehrani, Ph.D., Zymeworks' President & CEO. “This designation is key to our objective of getting important new therapies to patients as quickly as possible. We are pleased with the discussions we’ve had with the FDA thus far and will continue to work together on other opportunities to accelerate the development of ZW25 in additional indications.”

The FDA’s Fast Track designation is designed to facilitate development and expedite the review of therapies to treat a serious diseases where there is a significant unmet medical need. A therapeutic that receives Fast Track designation is eligible for frequent communication with the FDA, accelerated approval and priority review, and rolling submission, which means that a company can submit completed sections of its New Drug Application (NDA) for review by FDA, rather than waiting until every section of the NDA is completed before the entire application can be submitted for review. The primary objective of this program is to accelerate patient access to new and potential lifesaving therapies.

About the Trial

The Phase 2 trial is a two-part open-label study. The primary objectives of this trial are to confirm the safety, tolerability, and anti-tumor activity of ZW25 in combination with global standard of care regimens for gastroesophageal adenocarcinoma, including platinum and fluoropyrimidine-based regimens.

About ZW25

ZW25 is being evaluated in Phase 1 and Phase 2 clinical trials across North America and South Korea. It is a bispecific antibody, based on Zymeworks’ Azymetric platform, that can simultaneously bind two non-overlapping epitopes of HER2, known as biparatopic binding. This unique design results in multiple mechanisms of action including dual HER2 signal blockade, increased binding and removal of HER2 protein from the cell surface, and potent effector function leading to encouraging anti-tumor activity in patients. Zymeworks is developing ZW25 as a HER2-targeted treatment option for patients with any solid tumor that expresses HER2. The FDA has granted Fast Track designation to ZW25 for first-line gastroesophageal adenocarcinoma in combination with standard of care chemotherapy and Orphan Drug designation to ZW25 for the treatment of both gastric and ovarian cancers.