BEAM-302

Editing Approach:
Correction of E342K mutation

Delivery:
In vivo LNP

Clinical Trial:
Phase 1/2 Trial (Clinicaltrials.gov NCT06389877)

BEAM-302 is a liver-targeting lipid-nanoparticle (LNP) formulation of base editing reagents designed to correct the most common severe form of alpha-1 antitrypsin deficiency (AATD), which results from mutations in the Z allele, known as PiZ, caused by a single G to A point mutation in the SERPINA1 gene. A one-time A-to-G correction of the PiZ mutation with Beam’s adenine base editor has the potential to simultaneously reduce the aggregation of mutant, misfolded AAT protein that causes toxicity to the liver (Z-AAT), generate therapeutic levels of corrected protein (M-AAT), and increase total and functional AAT in circulation, thereby addressing the underlying pathophysiology of both the liver and lung disease. BEAM-302 is delivered via an intravenous infusion.

BEAM-302 is being evaluated in a Phase 1/2, open-label, dose exploration and dose expansion clinical trial to investigate its safety, tolerability, pharmacodynamics, pharmacokinetics and efficacy in AATD patients. Part A of the trial is designed to evaluate AATD patients with lung disease, and Part B will evaluate AATD patients with mild to moderate liver disease with or without lung disease. The dose expansion portions of the trial will identify the optimal dose to take forward in development.

BEAM-302 was granted orphan drug designation and Regenerative Medicine Advanced Therapy (RMAT) designation by the U.S. Food and Drug Administration.