Beam Therapeutics Announces Positive Initial Data for BEAM-302 in the Phase 1/2 Trial in Alpha-1 Antitrypsin Deficiency (AATD), Demonstrating First Ever Clinical Genetic Correction of a Disease-causing Mutation

Single Dose of BEAM-302 Led to Durable, Dose-dependent Increases in Total and Functional Alpha-1 Antitrypsin (AAT), Production of Corrected M-AAT, and Decreases in Mutant Z-AAT in Circulation Across Initial Three Dose Levels Third Dose Level of BEAM-302 (60 mg, N=3) Achieved Mean Total AAT of 12.4µM at Day 28, Exceeding Protective Therapeutic Threshold, and Reduced Mutant Z-AAT up to 78% Initial Safety Findings Demonstrated BEAM-302 was Well Tolerated at All Dose Levels with No Serious Adverse Events or Do ...