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REGENXBIO Presents Positive Twelve-Month Pivotal Data from Phase I/II/III CAMPSIITE® Trial of RGX-121 for Treatment of MPS II
12-month pivotal data further demonstrate the ability of one-time RGX-121 treatment to improve outcomes for patients with MPS II >80% reduction in CSF levels of HS D2S6, key biomarker of MPS II brain disease, sustained through 1 year Pivotal patients demonstrate continued skill acquisition or stability, stratified by baseline function, through 1 year Primary endpoint of CSF HS D2S6 reduction at week 16 met; strong correlation to neurodevelopmental outcomes at 1 year, supporting HS D2S6 as surrogate biomarker reasonably likely to predict clinical benefit RGX-121 would be the first and only potential one-time, commercially-available therapy designed to directly address the underlying genetic cause of Hunter syndrome, if approved ROCKVILLE, Md. , Sept. 5, 2025 /PRNewswire/ -- REGENXBIO Inc. (Nasdaq: RGNX) today announced new, positive data from the Phase I/II/III CAMPSIITE® trial of clemidsogene lanparvovec (RGX-121) for the treatment of patients with Mucopolysaccharidosis Type II (MPS II), also known as Hunter syndrome, at the International Congress of Inborn Errors of Metabolism (ICIEM) 2025.