Core Insights - Ultragenyx Pharmaceuticals (RARE) has received FDA Breakthrough Therapy designation for its investigational therapy GTX-102 (apazunersen) aimed at treating Angelman syndrome (AS) [1][5]. FDA Breakthrough Therapy Designation - The Breakthrough Therapy designation accelerates the development and review of drugs for serious conditions, granted when early clinical evidence indicates significant improvement over existing treatments [2]. - Drugs with this designation benefit from enhanced guidance and support from senior FDA officials [2]. Clinical Study Results - GTX-102 demonstrated rapid and lasting improvements in AS patients during a phase I/II study lasting up to three years, involving 74 patients aged 4 to 17 with complete maternal UBE3A gene deletion [5][6]. - Participants showed consistent developmental progress and ongoing improvements across multiple symptom areas during treatment [6]. Current and Future Studies - Ultragenyx is currently enrolling patients for a phase III Aspire study and plans to initiate a phase II/III Aurora study to evaluate GTX-102 for a broader range of AS genotypes [8]. - The Aurora study is expected to start in the second half of 2025 [8]. Market Context - AS is a rare neurogenetic disorder affecting approximately 60,000 individuals in accessible markets, leading to severe developmental challenges with no approved therapies currently available [7]. Other Clinical Programs - Ultragenyx is developing other gene therapy candidates, including UX143 for osteogenesis imperfecta, which received Breakthrough Therapy designation in October 2024 [9]. - The company is also evaluating UX701 for Wilson disease and has achieved significant results in the phase III GlucoGene study for glycogen storage disease type Ia [10]. - A regulatory application for UX111, an AAV gene therapy for Sanfilippo syndrome type A, is under Priority Review, with a decision expected on August 18, 2025 [11].

Ultragenyx Pharmaceutical (RARE) Q1 2025 Earnings Call May 06, 2025 05:00 PM ET Company Participants Joshua Higa - VP - Investor RelationsEmil Kakkis - Founder, President, CEO & DirectorErik Harris - Executive VP & Chief Commercial OfficerHoward Horn - Executive VP of Corporate Strategy & CFOEric Crombez - Chief Medical Officer & Executive VPTazeen Ahmad - MD - US Equity ResearchGena Wang - MD - Biotech Equity ResearchYigal Nochomovitz - DirectorWill Soghikian - Vice President - Equity ResearchLiisa Bayko - ...

Corporate Presentation May 2025 Confidential and Proprietary Forward looking statements Cautionary note regarding forward-looking statements: This presentation contains forward-looking statements, including, but not limited to, statements regarding our expectations, estimates, assumptions, and projections regarding our future operating results and financial performance, including our expectations for profitability in 2027, anticipated cost or expense management, plans with respect to commercializing our pro ...