Company Announcements

-- ALPHA-ORBIT Pivotal Phase 3 Trial Evaluating Every 3- and Every 6-Month Administration of Navenibart (STAR-0215) in Hereditary Angioedema is Enrolling Patients --

-- Upcoming Navenibart and STAR-0310 Data: ALPHA-SOLAR Long-Term Extension Trial Results Expected Mid-2025 and Phase 1a STAR-0310 Healthy Subject Results Expected in Q3 2025 --

BOSTON--(BUSINESS WIRE)--May 13, 2025-- Astria Therapeutics, Inc. (NASDAQ:ATXS), a biopharmaceutical company focused on developing life-changing therapies for allergic and immunologic diseases, today reported financial results for the first quarter ended March 31, 2025, and provided a corporate update.

“As a late-stage clinical company, we are focused on delivering on navenibart, a therapy with a trusted mechanism and modality, best-in-class profile, and the potential to change the way that people live with HAE,” said Jill C. Milne, Ph.D., Chief Executive Officer at Astria Therapeutics. “Our goal is to ensure that navenibart reaches its full potential as the market-leading HAE therapy. We are thrilled with patient and physician enthusiasm for the program as we enroll patients in our trial. With STAR-0310, we anticipate early proof-of-concept results from the Phase 1a trial in Q3, which we expect to be informative on differentiation regarding efficacy, safety, and low treatment burden and next steps.”

Navenibart (STAR-0215)

• The ALPHA-ORBIT pivotal Phase 3 trial of navenibart in people with hereditary angioedema (HAE) is enrolling patients, with top-line results expected in early 2027. The ALPHA-ORBIT trial is a global, randomized, double-blind, placebo-controlled Phase 3 clinical trial to evaluate the efficacy and safety of navenibart over 6 months and includes both every 3-month (Q3M) and every 6-month (Q6M) treatment arms. The primary endpoint is time-normalized monthly HAE attacks at 6 months, and a key secondary endpoint includes the proportion of participants who are attack-free at 6 months. After 6 months, patients may be eligible to enter a long-term trial called ORBIT-EXPANSE, in which all patients will be treated with navenibart and which will include a patient-centered flexible dosing period and assess the long-term safety and tolerability as well as efficacy of navenibart. The navenibart Phase 3 program consists of the ALPHA-ORBIT Phase 3 trial and the ORBIT-EXPANSE long-term trial, which are designed to support registration globally.
• Positive final top-line results from target enrollment in the Phase 1b/2 ALPHA-STAR trial of navenibart, announced in December 2024, showed rapid onset of robust and durable efficacy, favorable safety and tolerability, and pharmacokinetics and pharmacodynamics consistent with sustained plasma kallikrein inhibition for both Q3M and Q6M administration. Final results included reduction in mean monthly attack rate of 90-95% and up to a 67% attack-free rate over 6 months.
• All of the 16 target enrollment patients from ALPHA-STAR have entered the ALPHA-SOLAR long-term open-label trial. Initial safety and efficacy data from ALPHA-SOLAR, with long-term Q3M and Q6M administration, are expected mid-2025.
• Physician market research (n=50) reinforced the potential for navenibart to be the market-leading therapy for HAE. Physicians anticipated that offering both Q3M and Q6M options would gain 53% of their patient share for those initiating preventative therapy for the first time based on the existing treatment landscape, and 46% for those switching from currently available injectable and oral therapies.

STAR-0310

• Astria is developing STAR-0310, an investigational high-potency and long-acting monoclonal antibody OX40 antagonist that incorporates YTE technology, for the treatment of atopic dermatitis (AD) and potentially other indications. STAR-0310 was intentionally designed to capitalize on the learnings of OX40 receptor and OX40 ligand programs with the goal of having the best overall OX40 therapy.
• The Company initiated a Phase 1a clinical trial of STAR-0310 in healthy subjects in January 2025. The Phase 1a trial is intended to assess the safety, tolerability, pharmacokinetics, and immunogenicity of STAR-0310 in healthy adult participants, with early proof-of-concept (POC) results expected in the third quarter of 2025.
• Preclinical data supporting the differentiated profile of STAR-0310 was presented at AAAAI in March 2025. STAR-0310 demonstrated an extended half-life in cynomolgus monkeys and STAR-0310 preserved T-cells. STAR-0310 significantly reduced antibody-dependent cellular cytotoxicity (ADCC) on activated T-cells and regulatory T-cells when compared to other anti-OX40 monoclonal antibodies. Reduction in ADCC activity has the potential to support a more favorable safety profile and wider therapeutic window for STAR-0310, which the Company believes could drive greater efficacy.

Corporate Updates

• Astria recently published its Corporate Responsibility Report. To learn more about Astria’s Corporate Responsibility initiatives, please view the full report at this link: https://astriatx.com/about-us/corporate-responsibility/.
• The Company will be attending the following upcoming investor conferences in June:
  • Jefferies Global Healthcare Conference: June 3-5, 2025, New York, New York
  • Oppenheimer Innovators in I&I Summit: June 25, 2025, New York, New York

First Quarter 2025 Financial Results

Cash Position: As of March 31, 2025, Astria had cash, cash equivalents and short-term investments of $295.1 million, compared to $328.1 million as of December 31, 2024. The Company expects that its cash, cash equivalents and short-term investments as of March 31, 2025 will be sufficient to fund its operations into mid-2027, including (i) for navenibart, support for all program activities through completion of our ALPHA-ORBIT Phase 3 trial, including activities related to the planned ORBIT-EXPANSE long-term trial and Phase 3 development and testing of drug device combinations for potential dosing of navenibart, and (ii) for STAR-0310, the completion of the ongoing Phase 1a clinical trial of healthy subjects. Net cash used in operating activities for the three months ended March 31, 2025 was $34.0 million, compared to $19.1 million for the three months ended March 31, 2024.

R&D Expenses: Research and development expenses were $27.8 million for the three months ended March 31, 2025, compared to $15.7 million for the three months ended March 31, 2024. The increase in research and development expenses was attributed to an increase in external expenses related to the ALPHA-ORBIT and STAR-0310 Phase 1a clinical trials during the three months ended March 31, 2025.

G&A Expenses: General and administrative expenses were $9.2 million for the three months ended March 31, 2025, compared to $8.4 million for the three months ended March 31, 2024. The increase in general and administrative expenses was attributable to stock-based compensation and company growth to support the advancement of our programs.

Operating Loss: Loss from operations was $37.0 million for the three months ended March 31, 2025, compared to $24.2 million for the three months ended March 31, 2024.

Net Loss: Net loss was $33.7 million for the three months ended March 31, 2025, compared to a net loss of $19.9 million for the three months ended March 31, 2024.

Net Loss Per Share Basic and Diluted: Net loss per share basic and diluted was $0.58 for the three months ended March 31, 2025, compared to a net loss basic and diluted of $0.38 per share for the three months ended March 31, 2024.

About Astria Therapeutics:

Astria Therapeutics is a biopharmaceutical company, and our mission is to bring life-changing therapies to patients and families affected by allergic and immunologic diseases. Our lead program, navenibart (STAR-0215), is an investigational monoclonal antibody inhibitor of plasma kallikrein in clinical development for the treatment of hereditary angioedema. Our second program, STAR-0310, is an investigational monoclonal antibody OX40 antagonist in clinical development for the treatment of atopic dermatitis. Learn more about our company on our website, www.astriatx.com, or follow us on Instagram @AstriaTx and on Facebook and LinkedIn.

Forward Looking Statements:

This press release contains forward-looking statements within the meaning of applicable securities laws and regulations including, but not limited to, statements regarding: the expected timing of receipt of topline results from the navenibart ALPHA-ORBIT Phase 3 trial; the goals and objectives of the ALPHA-ORBIT Phase 3 trial and the ORBIT-EXPANSE long-term trial, including that they are designed to support registration of Q3M and Q6M navenibart administration; the expected timing of release of initial safety and efficacy data from the ALPHA-SOLAR trial; our goal of developing two dosing options for navenibart; the potential for navenibart in the HAE market, including the potential to be the market leading treatment in HAE, the potential therapeutic and other benefits of navenibart as a treatment for HAE, and our vision and goals for the program; the potential therapeutic benefits and potential attributes of STAR-0310 as a treatment for AD; expectations regarding the nature and timing of receipt of early proof-of-concept results from such trial, including our expectation that such results will inform on STAR-0310’s differentiated profile; the potential to develop STAR-0310 in additional indications; our goals and vision for STAR-0310; anticipated cash runway; and the goal of bringing life changing therapies to patients and families affected by allergic and immunological diseases and to become a leading allergy and immunology company. The use of words such as, but not limited to, “anticipate,” “believe,” “continue,” “could,” “estimate,” “expect,” “goals,” “intend,” “may,” “might,” “plan,” “potential,” “predict,” “project,” “should,” “target,” “will,” “would,” or “vision,” and similar words expressions are intended to identify forward-looking statements. Forward-looking statements are neither historical facts nor assurances of future performance. Instead, they are based on Astria’s current beliefs, expectations and assumptions regarding the future of its business, future plans and strategies, future financial performance, results of pre-clinical and clinical results of Astria’s product candidates and other future conditions. Actual results may differ materially from those indicated by such forward-looking statements as a result of various important factors, including the following risks and uncertainties: changes in applicable laws or regulations; the possibility that we may be adversely affected by other economic, business, and/or competitive factors; risks inherent in pharmaceutical research and development, such as: adverse results in our drug discovery, preclinical and clinical development activities, the risk that the results of preclinical studies, including of navenibart and STAR-0310, may not be replicated in clinical trials, that the preliminary or interim results from clinical trials may not be indicative of the final results, that the results of early stage clinical trials, such as the results from the navenibart Phase 1a clinical trial and the initial results from the ALPHA-STAR trial, may not be replicated in later stage clinical trials, including additional and final results from the ALPHA-STAR trial or the planned navenibart Phase 3 development program; the risk that we may not be able to enroll sufficient patients in our clinical trials on a timely basis, and the risk that any of our clinical trials may not commence, continue or be completed on time, or at all; decisions made by, and feedback received from, the FDA and other regulatory authorities on our regulatory and clinical trial submissions and other feedback from potential clinical trial sites, including investigational review boards at such sites, and other review bodies with respect to navenibart, STAR-0310, and any other future development candidates, and devices for such product candidates; our ability to manufacture sufficient quantities of drug substance and drug product for navenibart, STAR-0310, and any other future product candidates, and devices for such product candidates, on a cost-effective and timely basis, and to develop dosages and formulation for navenibart, STAR-0310, and any other future product candidates that are patient-friendly and competitive; our ability to develop biomarker and other assays, along with the testing protocols therefore; our ability to obtain, maintain and enforce intellectual property rights for navenibart, STAR-0310, and any other future product candidates; our potential dependence on collaboration partners; competition with respect to navenibart, STAR-0310, or any of our other future product candidates; the risk that survey results and market research may not be accurate predictors of the commercial landscape for HAE, the ability of navenibart to compete in HAE and the anticipated position and attributes of navenibart in HAE based on clinical data to date, its preclinical profile, pharmacokinetic modeling, market research and other data; risks with respect to the ability of STAR-0310 to compete in AD and the anticipated position and attributes of STAR-0310 in AD based on its preclinical profile; our ability to manage our cash usage and the possibility of unexpected cash expenditures; our ability to obtain necessary financing to conduct our planned activities and to manage unplanned cash requirements; the risks and uncertainties related to our ability to recognize the benefits of any additional acquisitions, licenses or similar transactions; and general economic and market conditions; as well as the risks and uncertainties discussed in the “Risk Factors” section of our Annual Report on Form 10-K for the period ended December 31, 2024 and in other filings that we may make with the Securities and Exchange Commission.

New risks and uncertainties may emerge from time to time, and it is not possible to predict all risks and uncertainties. Astria may not actually achieve the forecasts or expectations disclosed in our forward-looking statements, and investors and potential investors should not place undue reliance on Astria’s forward-looking statements. Neither Astria, nor its affiliates, advisors or representatives, undertake any obligation to publicly update or revise any forward-looking statement, whether as result of new information, future events or otherwise, except as required by law. These forward-looking statements should not be relied upon as representing Astria’s views as of any date subsequent to the date hereof.

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Astria Contact:
Investor Relations and Media:
Elizabeth Higgins
investors@astriatx.com

Source: Astria Therapeutics, Inc.