Zymeworks Announces Selection of ZW25 Abstract for Oral Presentation at the American Society of Clinical Oncology (ASCO) Annual Meeting

On April 25, 2018 Zymeworks Inc. (NYSE/TSX: ZYME), a clinical-stage biopharmaceutical company developing multifunctional therapeutics, reported that the abstract highlighting new data from the Company’s adaptive Phase 1 clinical trial for ZW25 has been selected for an oral presentation at the American Society of Clinical Oncology (ASCO) (Free ASCO Whitepaper) being held in Chicago from June 1 through 5, 2018 (Press release, Zymeworks, APR 25, 2018, View Source [SID1234525665]).

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The oral presentation, entitled "Single Agent Activity of ZW25, a HER2 Targeted Bispecific Antibody, in Heavily Pretreated HER2 Expressing Cancers," is scheduled for Friday June 1, 2018 at 2:45 pm CT during the session on Developmental Therapeutics – Clinical Pharmacology and Experimental Therapeutics in room S406.

"We look forward to sharing the updated ZW25 data and are honored that it has been selected by ASCO (Free ASCO Whitepaper) for an oral presentation at their annual meeting," said Ali Tehrani, Ph.D., Zymeworks’ President & CEO. "With over 35,000 oncology professionals from around the world anticipated to attend, it is an excellent opportunity to share an update of the data and to establish new relationships to realize the full potential of this therapeutic candidate."

Phase 1 Testing of ZW25

Zymeworks’ adaptive Phase 1 study is divided into three parts. Enrollment in the first portion of the study (the dose-escalation phase) has been completed. The Company has previously reported preliminary results from this part of the trial showing encouraging tolerability and anti-tumor activity in heavily pretreated patients with HER2-expressing cancers, including breast and gastric cancers.

In the second part of the study, which is now ongoing, expansion cohorts are being enrolled to further assess ZW25’s tolerability and single agent anti-cancer activity. The five cohorts include patients with HER2 high breast, HER2 high gastric, HER2 intermediate breast, HER2 intermediate gastric, and other HER2-expressing cancers.

The third part of the study, which is also ongoing, is evaluating the safety and anti-tumor activity of ZW25 in combination with selected chemotherapy agents in patients with HER2 low to high-expressing breast cancer or HER2 intermediate to high-expressing gastric cancers.

About ZW25

ZW25 is being evaluated in a Phase 1 clinical trial in the United States and Canada. 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 and has led 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.