Zura Bio Limited (Nasdaq: ZURA) (“Zura Bio”), a clinical stage, multi-asset immunology company developing novel dual-pathway antibodies for autoimmune and inflammatory diseases, today announced the submission of a protocol to its open Investigational New Drug (IND) application with the U.S. Food and Drug Administration (FDA) for a Phase 2 study evaluating tibulizumab, a humanized tetravalent bispecific dual antagonist antibody designed to neutralize both IL-17A and BAFF, for the treatment of systemic sclerosis (SSc) in adults.

“Systemic sclerosis presents significant unmet needs, as current treatments largely target only its interstitial lung disease (ILD) component,” said Robert Lisicki, CEO of Zura Bio. “Tibulizumab, with dual IL-17A and BAFF inhibition, offers a potential first-in-class approach addressing both immune dysregulation and fibrosis—key drivers of the disease. This study protocol reflects our commitment to advancing therapies that could potentially bring meaningful improvements for those affected by systemic sclerosis.”

The planned Phase 2 clinical trial, a double-blind, randomized (1:1), placebo-controlled study, is designed to evaluate the safety, tolerability, and efficacy of tibulizumab in approximately 80 participants with early diffuse cutaneous systemic sclerosis (dcSSc). The anticipated study aims to demonstrate improvements in skin and lung symptoms, two primary complications of SSc, and includes an open-label extension. The trial is expected to initiate in Q4 2024, with an Orphan Drug Designation request already submitted to the FDA in the same quarter.

Tibulizumab has not received approval from any regulatory authority, and its safety and efficacy for the treatment of SSc have not been established.

ABOUT SYSTEMIC SCLEROSIS

Systemic sclerosis (SSc), also known as scleroderma, is a rare, life-threatening autoimmune disease affecting approximately 300,000 individuals worldwide, including around 100,000 in the United States. Characterized by chronic inflammation and progressive fibrosis of connective tissues, SSc primarily affects the skin and lungs but can also impact the heart, liver, kidneys, digestive tract, and vascular system. The most common symptoms of SSc include skin thickening and extreme sensitivity to cold in the extremities. The disease can also affect other organs and tissues, leading to muscle numbness and swelling, joint stiffness and reduced mobility, fibrosis in the lungs and heart, kidney dysfunction, and gastrointestinal issues such as difficulty swallowing, heartburn, bloating, constipation, and diarrhea.

There remains a high unmet medical need due to the limited treatment options available for individuals living with SSc. Currently, only two disease-modifying therapies are FDA-approved for severe lung complications of the disease (i.e., SSc-ILD), and no effective treatment exists that addresses the disease across multiple organ systems.

ABOUT TIBULIZUMAB

Tibulizumab, an investigational humanized, tetravalent bispecific dual-antagonist antibody, is a fusion of Taltz® (ixekizumab) and tabalumab, engineered to bind to and neutralize both IL-17A and BAFF. Tibulizumab is expected to enter Phase 2 clinical development for the treatment of systemic sclerosis in Q4 2024 and for the treatment of hidradenitis suppurativa in Q2 2025. Before in-licensing, Phase 1/1b studies of tibulizumab were conducted in Sj�gren’s syndrome and rheumatoid arthritis.

ABOUT ZURA BIO

Zura Bio is a clinical-stage, multi-asset immunology company developing novel dual-pathway antibodies for autoimmune and inflammatory diseases. Currently, Zura Bio is developing three assets which have completed Phase 1/1b studies. The company is developing a portfolio of therapeutic indications for tibulizumab (ZB-106), crebankitug (ZB-168), and torudokimab (ZB-880), with a goal of demonstrating their efficacy, safety, and dosing convenience in autoimmune and inflammatory diseases, including systemic sclerosis and other novel indications with unmet needs.

FORWARD-LOOKING STATEMENTS

This communication includes “forward-looking statements” within the meaning of the “safe harbor” provisions of the Private Securities Litigation Reform Act of 1995. Words such as “expect,” “estimate,” “project,” “budget,” “forecast,” “anticipate,” “intend,” “plan,” “may,” “will,” “could,” “should,” “believe,” “predict,” “potential,” “continue,” “strategy,” “future,” “opportunity,” “would,” “seem,” “seek,” “outlook,” “goal,” “mission,” and similar expressions are intended to identify such forward-looking statements. Forward-looking statements are predictions, projections and other statements about future events that are based on current expectations and assumptions and, as a result, are subject to risks and uncertainties that could cause the actual results to differ materially from the expected results. These statements are based on various assumptions, whether or not identified in this communication. These forward-looking statements in this release include, but are not limited to, statements regarding: Zura Bio’s forecasts, including with respect to business strategies and objectives; the potential of Zura Bio’s product candidates; and expectations with respect to Zura Bio’s development program, including regulatory matters, clinical trials and the design and timing thereof. These forward-looking statements are provided for illustrative purposes only and are not intended to serve as, and must not be relied on by an investor as, a guarantee, an assurance, a prediction or a definitive statement of fact or probability.

Actual events are difficult or impossible to predict and could differ materially from those expressed or implied in such forward-looking statements, as a result of these risks and uncertainties, which include, but are not limited to: Zura Bio’s expectations regarding its product candidates and their related benefits, and Zura Bio’s beliefs regarding competing product candidates and products both in development and approved, may not be achieved; Zura Bio's vision and strategy may not be successful; the timing of key events and initiation of Zura Bio's studies, regulatory matters and release of clinical data may take longer than anticipated or may not be achieved at all; the potential general acceptability and maintenance of Zura Bio's product candidates by regulatory authorities, payors, physicians, and patients may not be achieved; Zura Bio's ability to attract and retain key personnel; Zura Bio's expectations with respect to its future operating expenses, capital requirements and needs for additional financing may not be achieved; Zura Bio has not completed any clinical trials, and has no products approved for commercial sale; Zura Bio has incurred significant losses since inception, and expects to incur significant losses for the foreseeable future and may not be able to achieve or sustain profitability in the future; Zura Bio requires substantial additional capital to finance its operations, and if it is unable to raise such capital when needed or on acceptable terms, Zura Bio may be forced to delay, reduce, and/or eliminate one or more of its development programs or future commercialization efforts; Zura Bio may be unable to renew existing contracts or enter into new contracts; Zura Bio relies on third-party contract development manufacturing organizations for the manufacture of clinical materials; Zura Bio relies on contract research organizations, clinical trial sites, and other third parties to conduct of its preclinical studies and clinical trials; Zura Bio may be unable to obtain regulatory approval for its product candidates, and there may be related restrictions or limitations of any approved products; Zura Bio may be unable to successfully respond to general economic and geopolitical conditions; Zura Bio may be unable to effectively manage growth; Zura Bio faces competitive pressures from other companies worldwide; Zura Bio may be unable to adequately protect its intellectual property rights; and other factors set forth in documents filed, or to be filed by Zura Bio, with the Securities and Exchange Commission (SEC), including the risks and uncertainties described in the “Risk Factors” section of Zura Bio's Annual Report on Form 10-K for the year ended December 31, 2023 and other filings with the SEC. These risks and uncertainties may be amplified by health epidemics or other unanticipated global disruption events, which may continue to cause economic uncertainty. Zura Bio cautions that the foregoing list of factors is not exclusive or exhaustive and not to place undue reliance upon any forward-looking statements, which speak only as of the date made. Zura Bio gives no assurance that it will achieve its expectations. Zura Bio does not undertake or accept any obligation to update any forward-looking statements, except as required by law.

Megan K. Weinshank Head of Corporate Affairs ir@zurabio.com

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