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flag A three-year-old boy with Hunter syndrome in the U.S. became the first outside the UK to receive a gene therapy that halted his disease’s progression and restored key functions.

flag A three-year-old boy with Hunter syndrome, a rare genetic disorder, has become the first in the world to receive a groundbreaking gene therapy outside the UK, showing remarkable improvements after a one-time treatment in February 2025. flag The therapy, developed in Manchester, uses modified stem cells to deliver a functional gene that enables the body to produce a missing enzyme, including in the brain, halting neurological decline. flag Since treatment, the boy, Oliver Chu, has gained mobility, speech, and cognitive skills, and no longer needs weekly enzyme infusions. flag Tests confirm enzyme levels are now hundreds of times normal. flag The experimental treatment, part of a trial involving five boys, offers hope for children with similar genetic conditions, though it remains under long-term study and is not yet widely available.

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