Sangamo Shares Climb Following FDA's Acceptance of Gene Therapy Rolling Submission Request
FDA Acceptance: Sangamo Therapeutics' request for a rolling submission and review of its marketing application for ST-920, a gene therapy for Fabry disease, has been accepted by the U.S. FDA, leading to a ~9% increase in premarket shares.
Accelerated Approval Pathway: The FDA plans to consider the estimated glomerular filtration rate (eGFR) as an endpoint for ST-920's review under the accelerated approval pathway, with a rolling submission expected to begin in Q4 2025.
Positive Study Results: The Phase 1/2 STAAR study for ST-920 has shown a positive eGFR slope, supporting the therapy's potential effectiveness for patients with Fabry disease.
Financial Performance: Sangamo reported a GAAP EPS of -$0.11, missing expectations, and revenue of $0.6 million, which fell short by $33.8 million.
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Sangamo Initiates BLA Submission for ST-920, Expected in Q2 2026
- Clinical Trial Success: Sangamo's STAAR study demonstrated a positive mean annualized eGFR slope at 52 weeks across all dosed patients, with the FDA agreeing to use this as an endpoint for accelerated approval, indicating ST-920's potential as an effective treatment for Fabry disease patients.
- Favorable Safety Profile: Isaralgagene civaparvovec exhibited a favorable safety and tolerability profile in clinical trials, suggesting its potential as a one-time gene therapy that can provide durable clinical benefits, surpassing current treatment standards for Fabry disease.
- Accelerated Approval Pathway: Sangamo expects to complete its Biological License Application (BLA) submission to the FDA in the second quarter of 2026 using a rolling submission approach, allowing for ongoing review of completed modules, thereby expediting the approval process to meet urgent patient needs.
- Regulatory Support: Isaralgagene civaparvovec has received Orphan Drug, Fast Track, and RMAT designations from the FDA, along with Orphan Medicinal Product designation from the European Medicines Agency, highlighting its potential value and regulatory recognition in global markets, further enhancing Sangamo's competitive position.

Sangamo Initiates BLA Submission for ST-920, Expected Completion in Q2 2026
- Clinical Trial Results: Sangamo's STAAR study demonstrated a positive mean annualized eGFR slope at 52 weeks across all dosed patients, with the FDA agreeing to use this as an endpoint for accelerated approval, indicating ST-920's potential in treating Fabry disease.
- Safety Profile: Isaralgagene civaparvovec has shown a favorable safety and tolerability profile, expected to provide a safe and durable treatment option for Fabry patients, significantly improving multi-organ clinical benefits.
- Submission Timeline: Sangamo plans to complete its Biological License Application (BLA) submission in Q2 2026 using a rolling submission approach, allowing the FDA to review completed modules continuously, thus expediting the approval process.
- Regulatory Support: The therapy has received Orphan Drug, Fast Track, and RMAT designations from the FDA, reflecting regulatory recognition of its potential market value and enhancing Sangamo's competitive position in the gene therapy sector.









