4D Molecular Therapeutics(US:FDMT)2025-12-17 13:004D-710 Phase 1 Interim Data Key Takeaways - 4D-710 was well-tolerated with 4 to 24 months follow-up[14] - 4D-710 demonstrated clinically meaningful activity in lung function (FEV1, LCI2.5) and quality-of-life (CFQ-R-R)[14] - 4D-710 has durable CFTR transgene expression through at least 1 year[14] - Phase 2 enrollment is underway at Cohort 4 dose level[14] Cystic Fibrosis (CF) Market & 4D-710 Design - The CFTR modulator market size is approximately $11 billion in 2024[17] - 4D-710 is designed as a durable, redosable, variant-agnostic, disease-modifying therapy for CF lung disease[30] - 4D-710 utilizes aerosol delivery of a novel A101 vector invented with directed evolution[25] - The A101 vector enhances transduction of airway cells and overcomes potential barriers[26] Clinical Trial Results & Next Steps - In the Phase 1 trial, the 2.5E14 vg dose (Cohort 4) met the target expression profile of approximately 10-25% airway cells for CFTR RNA[63] - Durable expression of CFTR was observed with levels consistent with non-CF samples over 1 year[142] - The Cystic Fibrosis Foundation (CFF) has provided approximately $31 million in financial support for 4D-710 development[146] - The company expects to complete Phase 2 enrollment in H1 2026 and provide a program update in H2 2026[152]