Summary of Vir Biotechnology FY Conference Call - December 03, 2025 Company Overview - **Company**: Vir Biotechnology (NasdaqGS:VIR) - **Focus**: Development of innovative therapies for infectious diseases and cancer, particularly through T cell engagers and hepatitis programs Key Accomplishments in 2025 - **Clinical Programs**: Significant advancements in three clinical-stage T cell engagers and a registration program for hepatitis delta [2][4] - **Data Reporting**: First-time reporting of data on Vir-5500 (PSMA CD3 T cell engager) and Vir-5818 (HER2 CD3 T cell engager) with promising early results [2][3] - **Hepatitis Delta Program**: Achieved transformative data with 66% of patients achieving undetectable virus levels after 48 weeks of treatment [4] Clinical Development Highlights - **Vir-5500**: - Unique dual masking technology enhances safety and efficacy by preventing toxicity associated with naked PSMA T cell engagers [8][10] - Extended half-life of 8-10 days allows for less frequent dosing [10] - Early clinical data showed 58% of patients achieving a PSA reduction of 50, with only 25% experiencing any CRS (cytokine release syndrome) [15][16] - **Hepatitis Delta**: - Phase two Solstice trial demonstrated significant efficacy, with 66% of patients achieving target not detected status [4][30] - Enrollment for phase three trials (Eclipse) completed ahead of schedule, indicating strong demand for therapy [32] Differentiation and Competitive Landscape - **Masking Technology**: - Vir-5500 utilizes a dual masking approach that is distinct from single mask competitors, providing a better therapeutic index [21][22] - The Xtend mask technology has been validated in other marketed drugs, enhancing confidence in safety and efficacy [11][22] - **Market Positioning**: - Potential to position Vir-5500 in both pre- and post-Pluvicto treatment settings, aiming for a balance of efficacy and safety [26][27] Future Expectations - **Upcoming Data**: - Next data cut expected in January will focus on early readouts such as PSA levels and safety data, with a meaningful dataset anticipated [24] - **Product Presentation**: - Anticipated to be two subcutaneous injections, allowing for at-home administration or by healthcare professionals [33] Industry Insights - **Feedback from Medical Community**: - Positive reception from KOLs regarding the unmet medical need in hepatitis delta, with enthusiasm for the efficacy demonstrated in clinical trials [29][30] - **Enrollment Trends**: - Rapid enrollment in Eclipse trials reflects strong demand and interest in the hepatitis delta treatment [32] Conclusion - Vir Biotechnology has made significant strides in its clinical programs, particularly with its innovative masking technology for T cell engagers and promising results in its hepatitis delta program. The company is well-positioned to address unmet medical needs in both oncology and infectious diseases, with strong support from the medical community and a clear path forward for upcoming data releases and product development.