Societal CDMO Enters Agreement With Atossa Therapeutics to Provide Clinical Trial Services (CTS) for Innovative Selective Estrogen Receptor Modulator

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CTS Activities will Focus on Analytic Method Transfer, Manufacturing of R&D Engineering Batches, and Stability Studies to Support Planned Clinical Trials of Atossa’s Proprietary Oral (Z)-endoxifen Formulation

SAN DIEGO and GAINESVILLE, Ga., May 23, 2023 (GLOBE NEWSWIRE) -- Societal CDMO, Inc. (“Societal CDMO”; Nasdaq: SCTL), a contract development and manufacturing organization (CDMO) dedicated to solving complex formulation and manufacturing challenges primarily in small molecule therapeutic development, today announced that it has been selected by Atossa Therapeutics (Nasdaq: ATOS) to provide a range of its Clinical Trial Services (CTS) offerings focused on Atossa’s proprietary Selective Estrogen Receptor Modulator (SERM), (Z)-endoxifen. The agreement spans a range of activities including analytical method transfer/development and validation, cleaning verification method validation, manufacturing of multiple R&D engineering batches, and stability testing of the R&D engineering batches.

“Societal’s demonstrated expertise in the technology transfer of established drug products, along with our long track record of successfully formulating and manufacturing innovative small molecules, positions us well to align with Atossa and support the ongoing clinical development of the company’s proprietary oral formulation of (Z)-endoxifen. We are eager to initiate this important work and deliver exceptional results for Atossa,” said David Enloe, chief executive officer of Societal CDMO. “It is important to highlight that we are continuing to see growing demand for the CTS portion of our business, which is helping to both grow our overall revenue and diversify our expanding customer base.”

About (Z)-Endoxifen(Z)-endoxifen is the most active metabolite of the FDA approved Selective Estrogen Receptor Modulator (SERM), tamoxifen. Studies by others have demonstrated that the anti-estrogenic effects of tamoxifen are driven in a concentration-dependent manner by (Z)-endoxifen. In addition to its potent anti-estrogen effects, (Z)-endoxifen at higher concentrations has been shown to target PKCβ1, a known oncogenic protein.

Atossa has developed a proprietary oral formulation of (Z)-endoxifen that does not require liver metabolism to achieve therapeutic concentrations and is encapsulated to bypass the stomach as acidic conditions converts a greater proportion of (Z)-endoxifen to the inactive (E)-endoxifen. Atossa’s (Z)-endoxifen has been shown to be well tolerated in Phase 1 studies and in a small Phase 2 study of women with breast cancer. The company is currently studying (Z)-endoxifen in healthy women with measurable breast density and premenopausal women with ER+/HER2- breast cancer. Atossa’s (Z)-endoxifen is protected by two issued U.S. patents and numerous pending patent applications.

About Atossa TherapeuticsAtossa Therapeutics, Inc. is a clinical-stage biopharmaceutical company developing innovative medicines in areas of significant unmet medical need in oncology with a current focus on breast cancer. For more information, please visit www.atossatherapeutics.com

About Societal CDMOSocietal CDMO (NASDAQ: SCTL) is a bi-coastal contract development and manufacturing organization (CDMO) with capabilities spanning pre-Investigational New Drug (IND) development to commercial manufacturing and packaging for a wide range of therapeutic dosage forms with a primary focus in the area of small molecules. With an expertise in solving complex manufacturing problems, Societal CDMO is a leading CDMO providing therapeutic development, end-to-end regulatory support, clinical and commercial manufacturing, aseptic fill/finish, lyophilization, packaging and logistics services to the global pharmaceutical market.

In addition to our experience in handling DEA controlled substances and developing and manufacturing modified-release dosage forms, Societal CDMO has the expertise to deliver on our clients’ pharmaceutical development and manufacturing projects, regardless of complexity level. We do all of this in our best-in-class facilities, which total 145,000 square feet, in Gainesville, Georgia and San Diego, California.

Societal CDMO: Bringing Science to Society. For more information about Societal CDMO’s customer solutions, visit societalcdmo.com.

Forward-Looking StatementsThis press release includes 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. These statements, among other things, the Company’s expectations regarding the completion of the proposed public offering, the Company’s use of proceeds from the proposed offering, and other statements. The words “anticipate”, “believe”, “could”, “estimate”, “upcoming”, “expect”, “intend”, “may”, “plan”, “predict”, “project”, “will” and similar terms and phrases may be used to identify forward-looking statements in this press release. Our operations involve risks and uncertainties, many of which are outside our control, and any one of which, or a combination of which, could materially affect our results of operations and whether the forward-looking statements ultimately prove to be correct. Factors that could cause the company’s actual outcomes to differ materially from those expressed in or underlying these forward-looking statements include risks and uncertainties associated with demand for the company’s services, which depends in part on customers’ research and development and the clinical plans and market success of their products; customers’ changing inventory requirements and manufacturing plans; customers and prospective customers decisions to move forward with the company’s manufacturing services; the average profitability, or mix, of the products the company manufactures; the company’s ability to enhance existing or introduce new services in a timely manner; fluctuations in the costs, availability, and suitability of the components of the products the company manufactures, including active pharmaceutical ingredients, excipients, purchased components and raw materials, or the company’s customers facing increasing or new competition. These forward-looking statements should be considered together with the risks and uncertainties that may affect our business and future results presented herein along with those risks and uncertainties discussed in our filings with the Securities and Exchange Commission at www.sec.gov. These forward-looking statements are based on information currently available to us, and we assume no obligation to update any forward-looking statements except as required by applicable law.

Contacts: Stephanie Diaz (Investors) Vida Strategic Partners 415-675-7401 sdiaz@vidasp.com Tim Brons (Media) Vida Strategic Partners 415-675-7402 tbrons@vidasp.com Ryan D. Lake (CFO) Societal CDMO 770-531-8365 ryan.lake@societalcdmo.com

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Source: Societal CDMO, Inc.

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