Focal lesions following intracerebral gene therapy for mucopolysaccharidosis IIIA

Mucopolysaccharidosis type IIIA (MPSIIIA) caused by recessive SGSH variants results in sulfamidase deficiency, leading to neurocognitive decline and death. No disease‐modifying therapy is available. The AAVance gene therapy trial investigates AAVrh.10 overexpressing human sulfamidase (LYS‐SAF302) delivered by intracerebral injection in children with MPSIIIA. Post‐treatment MRI monitoring revealed lesions around injection sites. Investigations were initiated in one patient to determine the cause.

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