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Ultragenyx Announces Plans to File for Accelerated Approval of UX111 for the Treatment of Sanfilippo Syndrome Type A (MPS IIIA)
Agreement reached with FDA that cerebral spinal fluid (CSF) heparan sulfate (HS) can be used as a reasonable surrogate endpoint for accelerated approval Data
About this update from Ultragenyx Pharmaceutical Inc.
[{"type":"text","content":"Agreement reached with FDA that cerebral spinal fluid (CSF) heparan sulfate (HS) can be used as a reasonable surrogate endpoint for accelerated approval Data from existing clinical studies appear sufficient for a biologics license application (BLA) submission NOVATO, Calif., June 12, 2024 (GLOBE NEWSWIRE) -- Ultragenyx Pharmaceutical Inc. (NASDAQ: RARE) today announced that the company held a successful meeting with the U.S. Food and Drug Administration (FDA or the Agency) during which the company reached agreement with the Agency that cerebral spinal fluid (CSF) heparan sulfate (HS) is a reasonable surrogate endpoint that could support submission of a biologics license application (BLA) seeking accelerated approval for UX111 (ABO-102) AAV gene therapy for the treatment of Sanfilippo syndrome (MPS IIIA). The company will need to finalize details of its BLA with the Agency in a pre-BLA meeting with the intent to file late this year or early next. “Gaining alignment with the FDA that CSF HS is a relevant biomarker to enable accelerated approval in Sanfilippo syndrome is a pivotal moment for the community and paves the way for treatments for all fatal types of neuronopathic mucopolysaccharidoses,” said Emil D. Kakkis, M.D., Ph.D., chief executive officer and president of Ultragenyx. “We commend the FDA for appreciating the critical urgency to deliver potentially life-saving therapies to children with neurologically devastating diseases and we extend our gratitude to the patient and caregiver advocates, scientists and industry leaders that shared and collaborated to provide the comprehensive evidence needed to support this important decision.” As discussed with the FDA, the BLA filing will be based on the available data including from the ongoing pivotal Transpher A study evaluating the safety and efficacy of UX111 in children with MPS IIIA. Results from the Transpher A and long-term follow-up studies were recently presented at the 20th Annual WORLDSymposium™. About UX111UX111 is a novel in vivo gene therapy in Phase 1/2/3 development for Sanfilippo syndrome type A (MPS IIIA), a rare fatal lysosomal storage disease with no approved treatment that primarily affects the central nervous system (CNS). UX111 is designed to be dosed in a one-time intravenous infusion using a self-complementary AAV9 vector to deliver a functional copy of t...