IND Cleared for Ultragenyx mRNA Therapy

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FDA has cleared an Ultragenyx Pharmaceutical IND for UX053, an investigational mRNA therapy being evaluated for treating Glycogen Storage Disease Type III (GSDIII). Enrollment in a planned Phase 1/2 study is expected to begin in the second half of this year. The two-part clinical trial will see Part 1 as an open label, 12-patient study who receive a single ascending dose of UX053, according to the company. Part 2 is a randomized, double-blind, placebo-controlled multi-ascending study of five doses in 16 patients across four cohorts randomized 3:1 to UX053 or placebo. In addition to safety, tolerability, and pharmacokinetics, study endpoints include clinician- and patient-reported outcomes, muscle strength, and biomarkers of liver, cardiac, and muscle health, Ultragenyx says.

 

GSDIII is caused by a glycogen debranching enzyme (AGL) deficiency that leads to glycogen accumulation in the liver and muscle, which can cause hepatomegaly, hypoglycemia, hyperlipidemia, some progressive liver cirrhosis, and skeletal and cardiac muscle disease, the company says. There are no approved treatment options and the current standard of care is a strict diet, including frequent doses of cornstarch, to reduce the risk of hypoglycemia.

 

“UX053 is an investigational mRNA-based biologic therapy encoding full-length, glycogen debranching enzyme encapsulated in a lipid nanoparticle (LNP) designed to provide the deficient protein in GSDIII,” Ultragenyx says.

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