Atossa Therapeutics, Inc. develops clinical-stage medicines for oncology and other areas of unmet medical need. Its recurring news centers on (Z)-endoxifen, the company's lead product candidate, including breast cancer research, mammographic breast density data, and expansion into rare disease indications such as Duchenne muscular dystrophy and McCune-Albright Syndrome.
Company updates also cover FDA orphan and rare pediatric disease designations, clinical and preclinical data presentations, peer-reviewed publications, intellectual property developments, leadership additions, financial results, and capital-allocation commentary tied to Atossa's development strategy.
Atossa Therapeutics (NASDAQ: ATOS) announced full results from its Phase 2 KARISMA-Endoxifen trial, showing significant reductions in mammographic breast density (MBD) in premenopausal women. The randomized, double-blind study of 240 women aged 40-55 tested 1mg and 2mg doses of (Z)-endoxifen against placebo over six months.
The 1mg dose reduced MBD by 17.3 percentage points and the 2mg dose by 23.5 percentage points (both p0.01), compared to 0.27 points for placebo. The 1mg dose showed no significant difference in adverse events versus placebo, while the 2mg dose had higher rates of side effects. Plasma concentrations were 4.8 ng/mL and 9.7 ng/mL for 1mg and 2mg doses respectively.
Atossa Therapeutics (ATOS) presented pharmacokinetic and tolerability data from its Phase 2 EVANGELINE trial at SABCS 2024. The trial investigates (Z)-endoxifen as a neoadjuvant treatment for premenopausal women with ER+/HER2-negative breast cancer. Key findings include: 50% of patients receiving 80mg (Z)-endoxifen with goserelin met target steady-state plasma concentrations, while 38% reached target levels without goserelin. The 80mg dose achieved tissue levels double that of plasma levels in 90% of patients.
The treatment showed substantial tumor suppression across all dosing levels, with Ki-67 response rates above 85%. Quality of life data indicated the treatment was generally well-tolerated. Based on these results, EVANGELINE will proceed with an amended protocol comparing 40mg/day (Z)-endoxifen plus OFS to exemestane plus OFS, with recruitment expected to begin in 2025.
Atossa Therapeutics (NASDAQ: ATOS) presented research on the anti-cancer activity of (Z)-endoxifen and its byproducts at the AACR Special Conference. The study investigated four (Z)-endoxifen byproducts for treating estrogen receptor-positive (ERα+) breast cancer, including endocrine-resistant tumors.
Two compounds, AT416E and AT402E, showed strong anti-proliferative activity, with AT416E demonstrating enhanced inhibition of cell migration and invasion. All four byproducts exhibited greater anti-proliferative effects than (Z)-endoxifen in estrogen-deficient conditions, while (Z)-endoxifen proved most effective at inducing cell cycle arrest and apoptosis.
The company plans future in vivo studies to validate these compounds' potential in overcoming current endocrine therapy limitations.
Atossa Therapeutics (NASDAQ: ATOS) announced its upcoming presentation at the AACR Special Conference in Cancer Research in Toronto, December 9-11, 2024. The company will present a poster titled 'Anti-cancer Activity of (Z)-Endoxifen-Related Compounds in ERα+ Breast Cancer' on December 10, 2024.
The research focuses on optimizing therapeutic efficacy and tolerability through modifications to (Z)-endoxifen chemistry in treating estrogen receptor alpha-positive breast cancer. The presentation aims to demonstrate how these compounds could enhance potency and reduce adverse effects in cancer treatment outcomes.
Atossa Therapeutics (ATOS) announced that five abstracts featuring data on (Z)-endoxifen have been accepted for presentation at the San Antonio Breast Cancer Symposium (SABCS) in December 2024. The presentations will showcase findings from various studies evaluating (Z)-endoxifen in breast cancer prevention and treatment, including phase 2 trials and combination therapy research. Key presentations include studies on breast cancer prevention, quality of life outcomes in premenopausal patients, pharmacokinetic profiles, synergistic treatment combinations, and a non-inferiority trial comparing (Z)-endoxifen to existing treatments.
Atossa Therapeutics (NASDAQ: ATOS) announced Q3 2024 financial results and corporate updates. Key highlights include positive topline results from KARISMA-Endoxifen Phase 2 study showing significant mammographic breast density reductions of 19.3% and 26.5% in 1mg and 2mg treatment arms. The I-SPY 2 trial met its primary endpoint with 95% of patients completing treatment, showing 69% reduction in Ki-67 and 30.4% reduction in tumor volume. The company ended Q3 with $74.8 million in cash and no debt. Operating expenses decreased to $6.4 million in Q3 2024 from $7.5 million in Q3 2023.
Atossa Therapeutics (Nasdaq: ATOS) has appointed Claudia Lopez, DVM, MSc, as Vice President of Clinical Product Development. Dr. Lopez brings over 20 years of clinical development and strategic expertise, particularly in immunology, oncology, and metabolic disease. Previously Vice President of Clinical Development at Landos Biopharma, she has held leadership positions at Arena Pharmaceuticals and Takeda Pharmaceuticals. In her new role, Dr. Lopez will focus on advancing Atossa's clinical pipeline for breast cancer treatments, leveraging her experience in global clinical strategies, trial design, and regulatory alignment.
Atossa Therapeutics (ATOS) announced positive topline data from the KARISMA-Endoxifen Phase 2 study testing (Z)-endoxifen in premenopausal women with mammographic breast density (MBD). The study, conducted at Karolinska Institute, showed significant MBD reduction with low doses. Key results include:
- Relative density decrease of -19.3% and -26.5% for 1mg and 2mg doses respectively vs placebo
- Mean endoxifen plasma concentration of 5.18 ng/mL (1mg) and 10.87 ng/mL (2mg)
- side effects with only mild vasomotor symptoms reported
- Study included 240 women across three arms (80 each) over six months
Atossa Therapeutics (ATOS) announced promising preliminary results from a phase 2 trial of (Z)-endoxifen in the I-SPY 2 Endocrine Optimization Pilot study. The trial, involving 20 women with ER+/HER2- breast cancer, met its primary endpoint with 95% of patients receiving >75% of planned treatment at 10mg daily dose. Key findings showed a 69% reduction in Ki-67 (cancer cell division marker) and a 30.4% decrease in functional tumor volume after 3 weeks. The treatment was well-tolerated with only mild side effects reported, including hot flushes, insomnia, and fatigue, with no dose reductions or discontinuations required.
Atossa Therapeutics (NASDAQ: ATOS) announced its participation in a fireside chat at BIO-Europe 2024 in Stockholm, Sweden. The event, scheduled for November 4-6, 2024, will feature Dr. Steven Quay, CEO of Atossa, and Dr. Per Hall from the Karolinska Institute discussing the potential of combining AI-based risk models with emerging therapies to prevent breast cancer in high-risk patients.
The discussion will focus on the Stockholm Mammography Risk Stratified Trial (SMART), a study aiming to enroll 70,000 women to test an individualized, imaging-based screening model. This model is designed to identify women at the highest risk of developing breast cancer within two years. If validated, it could serve as a foundation for future trials investigating (Z)-endoxifen in breast cancer prevention.
Atossa Therapeutics is a clinical-stage biopharmaceutical company developing innovative medicines for oncology, with a focus on breast cancer prevention and treatment using (Z)-endoxifen.