Agenda Agenda | | | Corporate Outlook Dennis Hom Q&A ENTERING THE CLINIC WITH AX-0810 Establishing safety, PK, and the biomarker roadmap for proof of target engagement November 3, 2025 Strategic Overview Daniel A. de Boer AX-0810 Lead Pipeline Program in Liver Cristina Lopez Lopez Henkjan Verkade Daniel A. de Boer Cristina Lopez Lopez Gerard Platenburg Dennis Hom Cristina Lopez Lopez, MD, PhD Chief Medical Officer Dennis Hom Chief Financial Officer Gerard Platenburg Chief Scientific Officer Speakers Invited ...

Core Insights - ProQR Therapeutics has received authorization from the Central Committee on Research Involving Human Subjects (CCMO) for a Phase 1 Clinical Trial Application (CTA) for AX-0810, targeting cholestatic diseases [1][2] - AX-0810 is the first investigational RNA editing oligonucleotide (EON) from ProQR's Axiomer™ platform, aimed at reducing toxic bile acid accumulation in the liver [6][10] Company Overview - ProQR Therapeutics is focused on developing transformative RNA therapies using its proprietary Axiomer technology, which utilizes the body's own ADAR enzymes for RNA editing [1][10] - The company aims to create a new class of medicines for both rare and prevalent diseases with unmet medical needs [10] Clinical Development - The Phase 1 study of AX-0810 will assess safety, tolerability, pharmacokinetics (PK), and pharmacodynamics (PD) through biomarkers to establish proof of target engagement [2][6] - The trial will be conducted in the Netherlands, and dosing is set to begin following the CTA approval [2] Upcoming Events - ProQR will host a virtual Investor and Analyst Event on November 3, 2025, to discuss the clinical development of AX-0810 [2][8] - The event will feature presentations from ProQR management and Professor Henkjan J. Verkade, a key opinion leader in pediatric gastroenterology [2][4]

Core Insights - ProQR Therapeutics is focused on developing transformative RNA therapies using its proprietary Axiomer™ RNA editing technology platform [1][3] - The company will participate in several upcoming investor conferences, providing opportunities for engagement with investors [1][5] Company Overview - ProQR Therapeutics is dedicated to creating RNA therapies that can address both rare and prevalent diseases with unmet medical needs [3] - The Axiomer technology utilizes the human cell's own ADAR machinery to make precise single nucleotide edits in RNA, potentially reversing mutations or modulating protein expression [2][3] Upcoming Events - ProQR will present at the H.C. Wainwright Genetic Medicines Virtual Conference on October 14-15, 2025, with presentations available on demand starting October 14 [5] - The company will also participate in the H.C. Wainwright Liver Disease Virtual Conference on October 21-22, 2025, and the Chardan's 9th Annual Genetic Medicines Conference on October 21, 2025 [5]