GlobeNewswire Inc | Feb 3, 2021 09:30AM EST

February 03, 2021

SEATTLE, Feb. 03, 2021 (GLOBE NEWSWIRE) -- Atossa Therapeutics, Inc. (Nasdaq:ATOS), a clinical stage biopharmaceutical company seeking to discover and develop innovative medicines in areas of significant unmet medical need with a current focus on breast cancer and COVID-19, announces updated findings following 26 months of Expanded Access (or compassionate use) single-patient studies of Atossas Endoxifen.

To date, the patient has not had a recurrence of breast cancer, as assessed by clinical breast examination and mammography; has not had treatment-related changes in periodic laboratory blood tests and general clinical examinations; and, the treatment has been well tolerated, including an absence of typical vasomotor symptoms commonly associated with tamoxifen (for example, night sweats and hot flashes), an FDA-approved drug frequently prescribed for breast cancer treatment, commented Sidney Goldblatt, M.D., Principal Investigator.

At the end of 2018, the FDA authorized a single-patient study under its Expanded Access, or compassionate use program, for this breast cancer patient to receive Atossas oral Endoxifen in the window of opportunity between diagnosis of breast cancer and surgery. Following surgery, an additional compassionate use authorization was granted by the FDA for the same patient, who has now continued to take oral Endoxifen in the adjuvant setting following her surgery. She has now taken Atossas oral Endoxifen for approximately 26 months and is continuing to take oral Endoxifen daily under these authorizations.

This patient, like many breast cancer patients, was reluctant to take tamoxifen because of the well-documented side effects associated with that drug and because she lacked the proper liver enzymes to properly metabolize tamoxifen, commented Steve Quay, Ph.D., M.D., Atossas President and CEO. We are very encouraged by this patients experience with our Endoxifen over the past two years. Her experience serves as a model for ongoing development efforts.

About Atossa Therapeutics

Atossa Therapeutics, Inc. is a clinical-stage biopharmaceutical company seeking to discover and develop innovative medicines in areas of significant unmet medical need with a current focus on breast cancer and COVID-19. For more information, please visit www.atossatherapeutics.com.

Forward-Looking Statements Disclaimer Statement

Forward-looking statements in this press release, which Atossa undertakes no obligation to update, are subject to risks and uncertainties that may cause actual results to differ materially from the anticipated or estimated future results, including, without limitation, statements regarding the satisfaction of closing conditions relating to the offering and the anticipated use of proceeds from the offering, the risks and uncertainties associated with any variation between interim and final clinical results, actions and inactions by the FDA, the outcome or timing of regulatory approvals needed by Atossa including those needed to commence studies of AT-H201, AT-301 and Endoxifen, lower than anticipated rate of patient enrollment, estimated market size of drugs under development, the safety and efficacy of Atossas products, performance of clinical research organizations and investigators, obstacles resulting from proprietary rights held by others such as patent rights, whether reduction in Ki-67 or any other result from a neoadjuvant study is an approvable endpoint for oral Endoxifen, and other risks detailed from time to time in Atossas filings with the Securities and Exchange Commission, including without limitation its periodic reports on Form 10-K and 10-Q, each as amended and supplemented from time to time.

Company Contact:Atossa Therapeutics, Inc.Kyle Guse, CFO and General CounselOffice: 866 893-4927kyle.guse@atossainc.com

Investor Relations Contact:Core IROffice:(516) 222-2560ir@atossainc.com