BLA Rolling Submission Progress for ST-920 (Fabry)
First 2 modules of the rolling BLA for ST-920 submitted; company states the rolling submission is ~3/5 complete and anticipates completing the BLA submission as early as this summer, subject to adequate funding. FDA affirmed accelerated approval pathway using mean annualized eGFR slope at 52 weeks across all 32 dosed patients.
Regulatory Clarity from FDA
FDA recently affirmed that 104-week (2-year) eGFR data can serve as confirmatory evidence and indicated an additional confirmatory study will not be required, potentially accelerating path to traditional approval if 104-week data are submitted.
Durability and Clinical Data Signals
Company reports durability of benefit: 4 patients beyond 5 years with supraphysiological alpha‑Gal levels and 17 patients off enzyme replacement therapy (ERT), some over 3 years off ERT; team reports safety profile remains remarkable.
Neurology and Other Pipeline Milestones
Six clinical sites activated for Phase I/II STAND study (ST-503 for small fiber neuropathy); GLP toxicology study for ST-506 (prion disease) completed and analysis ongoing; ongoing CTA-enabling activities and productive MHRA interactions.
Scientific Visibility and Platform Advances
3 abstracts accepted at ASGCT and 4 presentations at the WORLD Symposium; showcased advances in zinc finger epigenetic regulation (Nav1.7, prion disease) and Modular Integrase (MINT) technology with reported impressive targeted integration levels across cell types.
Clinical Data Presentation and Long-Term Follow-up
1-year clinical module already submitted; company notes processes underway to clean and analyze full 2-year data and mentions seeing patients with up to 5 years’ follow-up, supporting long-term durability claims.