Omeros Corporation Announces Upcoming Presentation Detailing Narsoplimab Compassionate Use in Nine Patients with Hematopoietic Stem Cell Transplant-associated Thrombotic Microangiopathy

Omeros Corporation (NASDAQ:OMER) today announced the upcoming presentation of a report detailing narsoplimab treatment in nine adult patients with hematopoietic stem cell transplant-associated thrombotic microangiopathy (TA-TMA). Narsoplimab is Omeros' investigational antibody targeting MASP-2, the effector enzyme of the lectin pathway of the complement system.

The report was authored by an external group of U.S. investigators involved in the treatment of these patients with narsoplimab provided under Omeros' compassionate use program. It will be featured as a poster presentation at the 2024 Tandem Meetings – the Transplantation & Cellular Therapy Meetings of the American Society for Transplantation and Cellular Therapy and the Center for International Blood and Marrow Transplant Research, to be held February 21-24, 2024 in San Antonio, Texas.

The poster will be presented by Lindsay Adkins, MSN, FNP-BC, BMTCN, of the Sarah Cannon Transplant and Cellular Therapy Program, Nashville, Tennessee. Details of the presentation are as follows:

Real-World Experience with Narsoplimab (OMS721) for the Treatment of Transplant-Associated Thrombotic Microangiopathy (Poster #186)

Poster Session: Acute Regimen-Related Toxicity and Supportive Care

Date: Thursday, February 22, 2024

Presentation Time: 6:45 - 7:45 p.m. CST

Location: Exhibit Hall 4A

The presentation abstract is available now on the Tandem Meetings website at the following link:

https://tandem.confex.com/tandem/2024/meetingapp.cgi/Paper/23952

The poster is expected to be made available on Omeros' website at www.investor.omeros.com shortly after the meeting presentation.

About Omeros Corporation

Omeros is an innovative biopharmaceutical company committed to discovering, developing and commercializing small-molecule and protein therapeutics for large-market and orphan indications targeting immunologic disorders including complement-mediated diseases, cancers, and addictive and compulsive disorders. Omeros' lead MASP-2 inhibitor narsoplimab targets the lectin pathway of complement and is the subject of a BLA pending before FDA for the treatment of hematopoietic stem cell transplant-associated thrombotic microangiopathy. Omeros' long-acting MASP-2 inhibitor OMS1029 is currently in a Phase 1 clinical trial. OMS906, Omeros' inhibitor of MASP-3, the key activator of the alternative pathway of complement, is advancing in clinical programs for paroxysmal nocturnal hemoglobinuria and complement 3 glomerulopathy. Funded by the National Institute on Drug Abuse, Omeros' lead inhibitor of phosphodiesterase 7 OMS527 is in clinical development for the treatment of cocaine use disorder and is also being developed as a therapeutic for other addictions as well as for a major complication of treatment for movement disorders. Omeros also is advancing a broad portfolio of novel immuno-oncology programs comprised of two cellular and three molecular platforms. For more information about Omeros and its programs, visit www.omeros.com.

Forward-Looking Statements

This press release contains forward-looking statements within the meaning of Section 27A of the Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934, which are subject to the "safe harbor" created by those sections for such statements. All statements other than statements of historical fact are forward-looking statements, which are often indicated by terms such as "anticipate," "believe," "expect," "intend," and similar expressions and variations thereof. Forward-looking statements, including statements regarding Omeros' investigational drug candidates, anticipated next steps in relation to the BLA for narsoplimab or in relation to other development programs are based on management's beliefs and assumptions and on information available to management only as of the date of this press release. Omeros' actual results could differ materially from those anticipated in these forward-looking statements for many reasons, including, without limitation, unanticipated or unexpected outcomes of regulatory processes in relevant jurisdictions, unproven preclinical and clinical development activities, the Company's financial condition and results of operations, regulatory processes and oversight, challenges associated with manufacture or supply of our investigational or clinical products, intellectual property claims, competitive developments, litigation, and the risks, uncertainties and other factors described under the heading "Risk Factors" in the company's Annual Report on Form 10-K filed with the Securities and Exchange Commission on March 13, 2023. Given these risks, uncertainties and other factors, you should not place undue reliance on these forward-looking statements, and the company assumes no obligation to update these forward-looking statements, whether as a result of new information, future events or otherwise, except as required by applicable law.

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