• Last patient enrolled ahead of expectations in pivotal trial evaluating zanidatamab as monotherapy in 2L biliary tract cancers (BTC)

• Two zanidatamab data presentations at ASCO in June: 1L breast cancer and 1L gastroesophageal adenocarcinoma (GEA)

• Presented topoisomerase 1 inhibitor (TOPO1i) antibody-drug conjugate (ADC) platform at World ADC London highlighting next-generation ADC capabilities and potential ADC candidates

• Completed licensing agreement with Atreca utilizing ZymeLink's auristatin-based ADC platform

• ZW49 continues to progress towards anticipated data read-out in 2H22

• Will host conference call with Management today at 4:30 PM ET

Zymeworks Inc. (NYSE: ZYME), a clinical-stage biopharmaceutical company developing multifunctional biotherapeutics, today reported financial results for the first quarter ended March 31, 2022.

“We are incredibly excited to celebrate the milestone of the last patient enrolled for our pivotal study in second-line biliary tract cancers, as well as the continued progression of multiple zanidatamab clinical studies that we will be presenting over the course of the year starting at ASCO in June,” said Kenneth Galbraith, Chair & CEO. “The completion of enrollment in HERIZON-BTC-01 is an important step forward in our efforts to provide patients with a new HER2-targeted therapy for BTC with the potential to improve on the current standard of care. We completed this clinical milestone ahead of our previously guided timeline set out in January, and hope to continue delivering on our corporate goals and exceeding expectations as we move forward.”

First Quarter 2022 Business Highlights and Recent Developments

• Completed Enrollment in HERIZON-BTC-01 Pivotal Trial in 2L Biliary Tract Cancers (BTC)
  
  Enrollment was completed ahead of schedule for the global, pivotal trial
  
  (HERIZON-BTC-01) evaluating zanidatamab monotherapy in patients with previously-treated advanced HER2-amplified BTC. The primary endpoint of this pivotal trial is confirmed objective response rate as determined by independent central review and we expect to finalize and present top-line data by early 2023. We expect that full details of the study will be presented at a major medical meeting in 2023.

• Unveiled Next-Generation TOPO1i ADC Platform Presentation
  
  The presentation shown in March at World ADC London highlighted the development of our next-generation TOPO1i ADC payload technology. We anticipate sharing more information on potential therapeutic candidates leveraging this TOPO1i platform at our R&D day in the fourth quarter of this year as we advance towards our goal of submitting two new Investigational New Drug applications by the end of 2024.

• Completed Licensing Agreement with Atreca Utilizing Auristatin-Based ADC Platform
  
  The technology licensing agreement with Atreca provides further validation of our auristatin-based ADC and technology platforms and showcases our ability to generate continued non-dilutive funding opportunities.

• ZW49 Enrollment Continues to Advance Toward Anticipated Data Readout in 2H22
  
  Zymeworks’ second clinical-stage asset and first biparatopic HER2-targeting antibody-drug conjugate, ZW49, has completed enrollment of 30 patients in the expansion cohorts targeting 2.5 mg/kg every three weeks. Additionally, the weekly dosing regimen recently expanded enrollment in the 1.5 mg/kg cohort and, in parallel, is now enrolling patients in the 1.75 mg/kg escalation cohort. Enrollment continues to progress well and we remain on target to submit data for presentation at a major medical meeting expected to occur in the second half of this year.

Zanidatamab Update at 2022 American Society of Clinical Oncology (ASCO) Annual Meeting

Zymeworks’ Asia-Pacific partner BeiGene will present data at the upcoming ASCO meeting in June on the first-line treatment of patients with HER2+ metastatic breast cancer using zanidatamab plus chemotherapy and on the first-line treatment of patients with HER2+ metastatic GEA using zanidatamab in combination with chemotherapy and tislelizumab. The outcomes of these treatments will be released in abstract form on May 26^th, and more detailed information will be discussed at poster presentations on June 4^th for first-line GEA and on June 6^th for first-line breast cancer. Both presentations will provide further validation of zanidatamab’s clinical efficacy and stand to strengthen its position as a leading biparatopic HER2-targeting antibody. We plan to host a conference call to present the clinical results and clinical development strategy for zanidatamab after the ASCO Annual Meeting.

“We look forward to discussing these two important datasets at the ASCO meeting, and how the results will help shape our future development plans for zanidatamab,” said Neil Josephson, M.D., Chief Medical Officer. “This will be the first presentation of clinical data with zanidatamab in the first-line treatment of advanced or metastatic HER2-positive breast cancer. The GEA presentation will contain new data from patients treated with standard of care first-line chemotherapy combined with zanidatamab, and the PD-1 inhibitor tislelizumab; a regimen that is being evaluated in the ongoing phase 3 HERIZON-GEA-01 study. We also look forward to additional opportunities available throughout 2022 to provide progress updates and present additional clinical data to support our global development program for zanidatamab."

Financial Results for the Quarter Ended March 31, 2022

Zymeworks’ revenue relates primarily to non-recurring upfront fees, expansion payments or milestone payments from collaboration and license agreements, which can vary in timing and amount from period to period, as well as payments for research and development support. Revenue for the three months ended March 31, 2022 was $1.9 million compared to $0.6 million for the same period of 2021. Revenue for 2022 related to research support and other payments from our partners including cost sharing arrangements. Revenue for the same period in 2021 was also related to research support and other payments from our partners.

Research and development expense increased by $18.2 million in the three months ended March 31, 2022 compared to the same period in 2021. Research and development expense in 2022 included non-cash stock-based compensation recovery of $3.2 million, comprised of a $2.7 million recovery from equity classified awards and a $0.5 million recovery related to the non-cash mark-to-market revaluation of certain historical liability classified awards, as well as $5.5 million from restructuring expenses. Excluding stock-based compensation expense and restructuring expenses, research and development expense increased on a Non-GAAP basis by $17.7 million in 2022 compared to 2021. The increase related primarily to higher clinical trial expenses for zanidatamab, increased drug manufacturing expenses, severance and other expenses incurred due to the Company's restructuring program, partly offset by lower clinical trial expense for ZW49.

We expect research and development expenditures to fluctuate over time in line with the advancement, expansion and completion of the clinical development of our product candidates, as well as our ongoing preclinical research activities.

Excluding the impact of stock-based compensation and restructuring expenses, general and administrative expense increased on a Non-GAAP basis by $3.2 million in 2022 compared to 2021. This increase was primarily due to severance and other expenses incurred due to the Company's restructuring program in 2022 as well as a non-recurring sales tax refund recognized in 2021, which offset expenses in the prior year.

Net loss for the three months ended March 31, 2022 was $72.6 million compared to $44.6 million for the same period of 2021. This was primarily due to increase in research and development expenses and general and administrative expenses referred to above.

"We continue to make progress upon our goal of improving our financial position and have successfully completed the first steps with the reduction in anticipated spending through prioritization of R&D programs and the previously announced new equity issuance closed in January," said Chris Astle, Ph.D., SVP and Chief Financial Officer. "We remain committed to further improving our cash position through non-dilutive capital and executing on the framework laid out in January, and we look forward to reporting on these initiatives in the coming months."

As of March 31, 2022, Zymeworks had $300.5 million in cash resources consisting of cash, cash equivalents and short-term investments. Based on our current operating plan, we believe that our current cash resources, and proceeds from certain existing collaboration payments we anticipate receiving, will enable us to fund our planned operations into the second half of 2023 and potentially beyond. Further, we continue to make good progress towards our previously announced goal of executing on new partnerships and collaborations in order to provide additional non-dilutive sources of funding for our operations beyond 2023.

About Zymeworks Inc.

Zymeworks is a clinical-stage biopharmaceutical company dedicated to the discovery, development and commercialization of next-generation multifunctional biotherapeutics. Zymeworks’ suite of therapeutic platforms and its fully integrated drug development engine enable precise engineering of highly differentiated product candidates. Zymeworks’ lead clinical candidate, zanidatamab, is a novel Azymetric™ HER2-targeted bispecific antibody currently being evaluated in multiple Phase 1, Phase 2, and pivotal clinical trials globally as a targeted treatment option for patients with solid tumors that express HER2. Zymeworks’ second clinical candidate, ZW49, is a novel bispecific HER2‑targeted antibody-drug conjugate currently in Phase 1 clinical development and combines the unique design and antibody framework of zanidatamab with Zymeworks’ proprietary ZymeLink™ linker and cytotoxin. Zymeworks is also advancing a deep preclinical pipeline in oncology (including immuno-oncology agents) and other therapeutic areas. In addition, its therapeutic platforms are being leveraged through strategic partnerships with global biopharmaceutical companies. For more information on our ongoing clinical trials visit www.zymeworksclinicaltrials.com. For additional information about Zymeworks, visit www.zymeworks.com and follow @ZymeworksInc on Twitter.

Cautionary Note Regarding Forward-Looking Statements

This press release includes “forward-looking statements” within the meaning of the U.S. Private Securities Litigation Reform Act of 1995 and “forward-looking information” within the meaning of Canadian securities laws, or collectively, forward-looking statements. Forward-looking statements in this press release include, but are not limited to, statements that relate to Zymeworks’ expectations regarding implementation of its corporate goals, Zymeworks’ clinical development of its product candidates, related clinical trials, anticipated clinical data presentations, potential therapeutic effects of zanidatamab and its other product candidates, expected financial performance and future financial position, the commercial potential of technology platforms and product candidates, anticipated continued receipt of revenue from existing and future partners, Zymeworks’ preclinical pipeline, anticipated sufficiency of cash resources and other potential sources of cash to fund Zymeworks’ planned operations into the second half of 2023 and potentially beyond, Zymeworks’ ability to execute new collaborations and partnerships and other information that is not historical information. When used herein, words such as “plan”, “hope”, “believe”, “expect”, “may”, “continue”, “anticipate”, “potential”, “will”, “progress”, “look forward”, 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: the impact of the COVID-19 pandemic on Zymeworks’ business, research and clinical development plans and timelines and results of operations, including impact on its clinical trial sites, collaborators, and contractors who act for or on Zymeworks’ behalf, may be more severe and more prolonged than currently anticipated; 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; Zymeworks’ assumptions regarding its financial condition or future financial performance may be incorrect; Zymeworks may not recognize the anticipated cost savings of its reduction in workforce; 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 Quarterly Report on Form 10-Q for its quarter ended March 31, 2022, which the Company anticipates filing on or about the date hereof (a copy of which may be obtained at www.sec.gov and www.sedar.com). Consequently, forward-looking statements should be regarded solely as Zymeworks’ current plans, estimates and beliefs. Investors should not place undue reliance on forward-looking statements. Zymeworks cannot guarantee future results, events, levels of activity, performance or achievements. Zymeworks does not undertake and specifically declines any 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, except as may be required by law.

NON-GAAP FINANCIAL MEASURES

In addition to reporting financial information in accordance with U.S. generally accepted accounting principles (“GAAP”) in this press release, Zymeworks is also reporting adjusted expenses and adjusted loss per share, which are non-GAAP financial measures. Adjusted expenses and adjusted loss per share are not defined by GAAP and should not be considered as alternatives to net loss, net loss per share or any other indicator of Zymeworks’ performance required to be reported under GAAP. In addition, other companies, including companies in our industry, may calculate similarly titled non-GAAP or adjusted measures differently or may use other measures to evaluate their performance, all of which could reduce the usefulness of our adjusted expenses measures as tools for comparison. Investors and others are encouraged to review Zymeworks’ financial information in its entirety and not rely on a single financial measure. As defined by Zymeworks, adjusted expenses represent total research and development expenses and general and administrative expenses adjusted for non-cash stock-based compensation expenses for equity and liability classified equity instruments as well as expenses incurred in relation the restructuring program implemented in 2022.

Adjusted expenses are a non-GAAP measure that Zymeworks believes may be helpful to investors because they provide consistency and comparability with past financial performance.

(*): Research and development expenses and general and administrative expenses include stock-based compensation recovery related to the restructuring of $5,516 and $4,865, respectively, for the three months ended March 31, 2022.

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