Precision BioSciences AASLD Update Call Summary Company Overview - **Company**: Precision BioSciences (NasdaqCM:DTIL) - **Event**: AASLD Business Update Call - **Date**: November 11, 2025 Key Points Industry and Company Focus - Precision BioSciences is focused on gene editing technologies, particularly in the treatment of chronic hepatitis B (HBV) and Duchenne muscular dystrophy (DMD) [3][59] Core Programs and Developments - **Arcus Platform**: The backbone of Precision BioSciences, now delivering results in clinical settings [4][5] - **Chronic Hepatitis B Program**: The PBGene HBV in the ELIMINATE B trial is a key focus, with promising data presented at AASLD [6][7] - **Duchenne Muscular Dystrophy Program**: The PBGene DMD program is set to start clinical trials in 2026, targeting a broad patient population [58][59] Financial Updates - Precision BioSciences raised $75 million to secure cash and operational runway through 2028, supporting ongoing clinical trials [8][59] Clinical Trial Highlights - **ELIMINATE B Trial**: - Phase I study focusing on E antigen negative patients, with a goal to identify a dosing regimen that allows stopping nucleos(t)ide analogs (NUCs) and testing for a cure [21][22] - Cohort 3 has shown promising results with a dose of 0.8 mg/kg, indicating a near-term path towards stopping NUCs [38][44] - Safety profile has been manageable, with no dose-limiting toxicities observed [24][29] Efficacy Data - **S Antigen Reduction**: - Cohort 1 (0.2 mg/kg) showed a 50% reduction in S antigen after nine months [31] - Cohort 2 (0.4 mg/kg) demonstrated sustained S antigen decline in all patients [33] - Cohort 3 (0.8 mg/kg) showed significant declines in S antigen, indicating effective viral DNA removal [34][35] Safety Profile - Adverse events were predictable and consistent with LNP-related infusion reactions, resolving within 12 hours [24][29] - No evidence of liver dysfunction was observed, with transaminase elevations being transient [28][29] Future Directions - Completion of dosing in Cohort 3 is expected by 2026, with plans to test for a cure by stopping NUCs [44][45] - The company aims to file an IND for PBGene DMD by the end of 2025 and begin clinical trials in early 2026 [58][59] Regulatory Considerations - The FDA has outlined approvable efficacy endpoints, including sustained suppression of HBV DNA and S antigen off treatment for at least six months [46][48] Off-Target Editing and Genomic Integrity - Precision BioSciences conducts extensive preclinical evaluations to ensure the specificity of their gene editing technology, with no off-target effects detected at therapeutically relevant doses [89][95] Market Context - The company is addressing a significant unmet need in the chronic hepatitis B and DMD markets, with a focus on innovative gene editing solutions [12][49] Conclusion Precision BioSciences is making significant strides in gene editing therapies for chronic hepatitis B and Duchenne muscular dystrophy, with promising clinical data and a strong financial position to support ongoing and future trials. The focus on safety and efficacy, along with regulatory alignment, positions the company well for potential breakthroughs in these challenging therapeutic areas.