Zymeworks to Present Preclinical Data on T cell Engager and Antibody-Drug Conjugate Platforms in Six Posters at AACR Annual Meeting

Novel trispecific T cell engager, ZW209, demonstrates potent preclinical efficacy against DLL3-expressing tumors and an encouraging safety profile New antibody-drug conjugate (ADC) candidate, ZW327, exhibits anti-tumor activity and a favorable pharmacokinetics profile in Ly6E-bearing cancers VANCOUVER, British Columbia, March 25, 2025 (GLOBE NEWSWIRE) -- Zymeworks Inc. (Nasdaq: ZYME), a clinical-stage biotechnology company developing a diverse pipeline of novel, multifunctional biotherapeutics to improve the standard of care for difficult-to-treat diseases, including cancer, inflammation, and autoimmune disease, today announced the acceptance of six abstracts for poster presentation at the upcoming American Association for Cancer Research (AACR) Annual Meeting being held April 24-30, 2025 in Chicago, IL. “As our wholly-owned pipeline continues to progress, we are excited to share updates at AACR on our novel multifunctional therapeutics addressing difficult-to-treat cancers,” said Paul Moore, Ph.D., Chief Scientific Officer at Zymeworks. “Among these, we are excited to share updates on ZW209, our DLL3-targeting trispecific T cell engager incorporating co-stimulation, which is on track for IND submission in 1H-2026, and ZW327, our Ly6E-targeting antibody-drug conjugate incorporating our proprietary topoisomerase 1 inhibitor payload, ZD06519. These preclinical findings demonstrate how our therapeutic approaches have the potential to improve outcomes for patients with currently limited treatment options.” Poster Presentation Details T cell Engagers: Title: ZW171, a differentiated 2+1 T cell-engaging bispecific antibody with antitumor activity in a range of mesothelin expressing cancersAbstract: 3503Session Category: ImmunologySession Title: T Cell Engagers ZW171, a mesothelin (MSLN)-targeting T cell engager, currently in global Phase 1 clinical studies, shows promising preclinical activity in an expanded range of MSLN-positive tumor models including patient derived organoid and/or xenograft models of ovarian, pancreatic, and non-small cell lung cancer. These new findings expand our understanding of ZW171's differentiated profile and application to treat cancer models, further supporting our active clinical program's goal of helping patients with multiple types of difficult-to-treat cancers. Title: ZW209, a DLL3 targeted trispecific T cell engager with integrated CD28 co-stimulation, demonstrates safety and potent preclinical efficacy in models of small cell lung cancerAbstract: 7318Session Category: ImmunologySession Title: T Cell Engagers and Novel Antibody-Based Therapies ZW209, a trispecific T cell engager designed to optimally co-engage CD3 and CD28 on T cells and DLL3 on tumor cells, demonstrates potent and differentiated anti-tumor activity in multiple models of small cell lung cancer relative to benchmark DLL3 targeting T cell engagers. ZW209 also displays a favorable pharmacokinetics and safety profile in non-human primates following repeat dosing supporting further development. Antibody-Drug Conjugates: Title: ZW327, a novel Ly6E-targeting antibody-drug conjugate bearing a topoisomerase 1 inhibitor payloadAbstract: 2874Session Category: Experimental and Molecular TherapeuticsSession Title: Antibody-Based Cancer Therapeutics 2 ZW327, a potential first-in-class ADC targeting Ly6E, an antigen overexpressed in numerous tumor types including breast, lung, and digestive tract cancers, demonstrates promising preclinical activity, highlighting its potential as an innovative therapeutic approach. Utilization of a superior Ly6E binding and internalizing antibody with a proprietary topoisomerase 1 inhibitor payload, ZD06519, lends ZW327 a highly differentiated profile, with pronounced in vitro cytotoxicity against a panel of tumor cell line models, single administration tumor regression in multiple xenograft models, and a well-tolerated profile in species cross reactive preclinical toxicology. Title: Design and development of biparatopic antibody-drug conjugates against protein tyrosine kinase 7Abstract: 1565Session Category: Experimental and Molecular TherapeuticsSession Title: Antibody-Based Cancer Therapeutics 1 Protein Tyrosine Kinase 7 (PTK7) over expression across multiple tumor types including breast, digestive tract, and lung cancers, makes it an attractive target for ADCs. To enable optimal targeting, and overcome limitations of prior PTK7 ADCs, we have identified a lead biparatopic antibody displaying improved binding and internalization relative to that achieved with monospecific PTK7 antibodies. Relative to cofetuzumab pelidotin, a prior clinical stage PTK7 ADC, the lead PTK7 biparatopic antibody evaluated as an ADC utilizing Zymeworks’ proprietary topoisomerase 1 inhibitor payload, ZD06519, demonstrates increased efficacy in lung cancer xenograft models. Zymeworks scientists are coauthors on two additional presentations leveraging technologies to aid further in design and characterizations of ADCs: Title: High throughput quantitative molecular characterization of cytotoxic antibody-drug conjugates in spheroid models for improved functional characterization, screening and candidate selectionAbstract: 1230Session Category: Tumor BiologySession Title: 3D Models and Bioprinting Title: In vitro assays for prediction of ADC hematological toxicity: contribution of antibody, linker, and payloadAbstract: 5482Session Category: Experimental and Molecular TherapeuticsSession Title: Drug Discovery Assay Technologies About Zymeworks Inc. Zymeworks is a global clinical-stage biotechnology company committed to the discovery, development, and commercialization of novel, multifunctional biotherapeutics. Zymeworks’ mission is to make a meaningful difference in the lives of people impacted by difficult-to-treat conditions such as cancer, inflammation, and autoimmune disease. The Company’s complementary therapeutic platforms and fully integrated drug development engine provide the flexibility and compatibility to precisely engineer and develop highly differentiated antibody-based therapeutic candidates. Zymeworks engineered and developed zanidatamab, a HER2-targeted bispecific antibody using the Company’s proprietary Azymetric™ technology. Zymeworks has entered into separate agreements with BeiGene, Ltd. (BeiGene) and Jazz Pharmaceuticals Ireland Limited (Jazz Pharmaceuticals), granting each exclusive rights to develop and commercialize zanidatamab in different territories. The U.S. FDA granted accelerated approval of Ziihera® (zanidatamab-hrii) 50mg/mL for injection for intravenous use for the treatment of adults with previously-treated, unresectable or metastatic HER2-positive (IHC 3+) second-line biliary tract cancer (BTC). Ziihera® is the first and only dual HER2-targeted bispecific antibody approved for HER2-positive BTC in the U.S. Zanidatamab is currently under regulatory review in the EU and China for second-line BTC and is being evaluated in multiple global clinical trials as a potential best-in-class treatment for patients with multiple HER2-expressing cancers. Zymeworks is rapidly advancing a robust pipeline of wholly-owned product candidates, leveraging its expertise in both antibody-drug conjugates and multispecific antibody therapeutics targeting novel pathways in areas of significant unmet medical need. Phase 1 studies for ZW171 and ZW191 are now actively recruiting with an investigational new drug application for ZW251 planned for mid-2025. In addition to Zymeworks’ pipeline, its therapeutic platforms have been further leveraged through strategic partnerships with global biopharmaceutical companies. For information about Zymeworks, visit www.zymeworks.com and follow @ZymeworksInc on X. Cautionary Note Regarding Forward-Looking Statements This press release includes “forward-looking statements” or information within the meaning of the applicable securities legislation, including Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended. Forward-looking statements in this press release include, but are not limited to, statements that relate to Zymeworks’ preclinical pipeline; the potential therapeutic effects of and commercial potential of zanidatamab and Zymeworks’ other product candidates; anticipated IND submissions and the timing thereof; Zymeworks’ clinical development of its product candidates and enrollment in its clinical trials; anticipated preclinical and clinical data presentations; the ability to advance product candidates into later stages of development; and other information that is not historical information. When used herein, words such as “plan”, “believe”, “expect”, “may”, “anticipate”, “potential”, “will”, “on track”, “continues”, and similar expressions are intended to identify forward-looking statements. In addition, any statements or information that refer to expectations, beliefs, plans, projections, objectives, performance or other characterizations of future events or circumstances, including any underlying assumptions, are forward-looking. All forward-looking statements are based upon Zymeworks’ current expectations and various assumptions. Zymeworks believes there is a reasonable basis for its expectations and beliefs, but they are inherently uncertain. Zymeworks may not realize its expectations, and its beliefs may not prove correct. Actual results could differ materially from those described or implied by such forward-looking statements as a result of various factors, including, without limitation: clinical trials may not demonstrate safety and efficacy of any of Zymeworks’ or its collaborators’ product candidates; any of Zymeworks’ or its partners’ product candidates may fail in development, may not receive required regulatory approvals, or may be delayed to a point where they are not commercially viable; regulatory agencies may impose additional requirements or delay the initiation of clinical trials; the impact of new or changing laws and regulations; market conditions; inability to maintain or enter into new partnerships or strategic collaborations; and the factors described under “Risk Factors” in Zymeworks’ quarterly and annual reports filed with the Securities and Exchange Commission, including its Annual Report on Form 10-K for its year ended December 31, 2024 (a copy of which may be obtained at www.sec.gov and www.sedarplus.ca). Although Zymeworks believes that such forward-looking statements are reasonable, there can be no assurance they will prove to be correct. Investors should not place undue reliance on forward-looking statements. The above assumptions, risks and uncertainties are not exhaustive. Forward-looking statements are made as of the date hereof and, except as may be required by law, Zymeworks undertakes no obligation to update, republish, or revise any forward-looking statements to reflect new information, future events or circumstances, or to reflect the occurrences of unanticipated events. Contacts: Investor Inquiries:Shrinal InamdarSenior Director, Investor Relations(604) 678-1388ir@zymeworks.com   Media Inquiries:Diana PapoveSenior Director, Corporate Communications(604) 678-1388media@zymeworks.com

Zymeworks to Present Preclinical Data on T cell Engager and Antibody-Drug Conjugate Platforms in Six Posters at AACR Annual Meeting

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