Summary of Prime Medicine Conference Call - October 14, 2025 Company Overview - **Company**: Prime Medicine (NasdaqGM:PRME) - **Focus**: Development of novel gene and cell therapies utilizing a prime editing platform, which is described as a next-generation gene editing technology that is both versatile and safe [2][4][5] Core Technology and Advantages - **Prime Editing**: - Makes single-stranded breaks in DNA, avoiding double-stranded breaks, which reduces off-target effects and chromosomal rearrangements [5][6] - Capable of writing new genetic code directly into the genome, allowing for permanent changes [6][7] - Can address various mutations, including transition, transversion, and frameshift mutations [7][8] Pipeline Focus - **Current Pipeline**: - Focused on liver diseases, specifically: - **Wilson's Disease**: Expected to enter the clinic in the first half of 2026 [8][9] - **Alpha-1 Antitrypsin Deficiency**: Anticipated IND filing in mid-2026 [9][10] - Future programs include cystic fibrosis, with a goal to treat over 90% of patients [10][11] Discontinued Programs - **Chronic Granulomatous Disease (CGD)**: - Program discontinued due to limited patient population (approximately 1,000 patients in the US) and commercial viability concerns despite strong initial clinical data [12][14] Market Opportunity - **Wilson's Disease**: - Estimated patient population in the US: 10,000 to 11,000 [28] - Potential to treat over 60% of patients with various mutations, leading to a global market opportunity exceeding 20 billion dollars [30][29] Clinical Development and Data Expectations - **IND Filing**: - Guidance for IND filing for Wilson's Disease in the first half of 2026, with clinical data expected in 2027 [31][50] - **Trial Design**: - Biomarkers for Wilson's Disease include copper PET scans and ceruloplasmin levels to assess treatment efficacy [35][36] Competitive Landscape - **Alpha-1 Antitrypsin Deficiency**: - Acknowledgment of competition in the space, but confidence in prime editing's ability to provide a best-in-class therapy due to its endogenous control mechanism [37][38] Delivery Mechanism - **Lipid Nanoparticle (LNP) Technology**: - Universal liver LNP has shown high hepatocyte editing efficiency and is expected to facilitate rapid progression of multiple programs [42][44] - Potential for scalability beyond liver applications, with ongoing exploration of delivery methods for other organs [44][45] Collaboration and Partnerships - **Strategic Collaborations**: - Emphasis on the importance of partnerships for funding and expanding the reach of prime editing technologies [46][48] - Successful collaboration with BMS in ex vivo CAR T therapies, securing $110 million upfront [48] Financial Position - **Cash Runway**: - Approximately $260 million at the end of Q2 2025, expected to sustain operations into 2027 [50] Key Catalysts - **Upcoming Milestones**: - Initiation of clinical programs for Wilson's Disease and Alpha-1 Antitrypsin Deficiency in 2026, with significant data readouts anticipated in 2027 [50]

Summary of Prime Medicine Conference Call Company Overview - **Company**: Prime Medicine (PRME) - **Industry**: Biotechnology, specifically gene editing technology Core Points and Arguments 1. **Introduction of Prime Medicine**: The company focuses on prime editing technology, which is described as a next-generation gene editing platform that is versatile and safe for editing genomes, with applications in genetic diseases, oncology, and immunology [4][5][6] 2. **Recent Developments**: Prime Medicine has shown data for its first patient in humans, indicating the potential of prime editing as a cure for chronic granulomatous disease (CGD) [6][24][26] 3. **Pipeline Focus**: The company is concentrating on three major commercial opportunities: Wilson's disease, alpha-1 antitrypsin disease (AATD), and cystic fibrosis, alongside a partnership with Bristol-Myers Squibb for CAR T cell therapies [7] 4. **Comparison with Other Technologies**: Prime editing is positioned as superior to CRISPR and base editing due to its ability to make precise edits without double-stranded breaks, thus minimizing off-target effects [9][17][18] 5. **LNP Delivery System**: Prime Medicine has developed a robust lipid nanoparticle (LNP) platform that has shown high editing efficiency in the liver and is being evaluated for lung delivery in cystic fibrosis [20][21] 6. **Chronic Granulomatous Disease (CGD)**: The company reported rapid engraftment in the first patient treated for CGD, with DHR levels indicating functional neutrophils at 58% and 66% at 15 and 30 days post-treatment, respectively [24][25][26] 7. **Wilson's Disease Program**: Prime Medicine plans to file an IND or CTA in the first half of 2026, targeting approximately 20,000 patients in the US and EU, with preclinical data showing high editing efficiency [32][33][34] 8. **AATD Program**: The company aims to differentiate its AATD program from competitors by focusing on achieving wild-type protein levels, addressing the limitations of existing therapies [53][56][61] Important but Overlooked Content 1. **Cash Position**: As of March, the company reported a cash position of $158 million, which is expected to last through the first half of the following year, following a restructuring that reduced operational costs by 50% [72][73] 2. **Business Development Opportunities**: There is ongoing interest in Prime Medicine's technology, with potential for future deals, although no specific agreements have been promised [75] 3. **Translatability of Preclinical Data**: The company acknowledges the challenges in translating preclinical data to human outcomes but expresses confidence based on observed efficiencies and safety profiles [35][36][37] This summary encapsulates the key points discussed during the conference call, highlighting Prime Medicine's strategic focus, technological advantages, and future plans in the biotechnology sector.