Atossa Therapeutics Inc is a clinical stage biopharmaceutical company developing proprietary innovative medicines in areas of unmet medical need in oncology. It focuses on the development of novel therapeutics and delivery methods for the treatment of breast cancer, other breast conditions and COVID-19. The company's drug under development for breast cancer and other breast conditions is Endoxifen. Its two COVID-19 drugs under development are AT-H201, to improve lung function of moderate to severely ill, hospitalized COVID-19 patients by inhalation; and AT-301, a nasal spray for COVID-19 patients for at-home use.