A three-year-old boy has astounded doctors with his progress after becoming the first person in the world with his devastating disease to receive a ground-breaking gene therapy.
Oliver Chu has a rare, inherited condition called Hunter syndrome – or MPSII – which causes progressive damage to the body and brain.
In the most severe cases, patients with the disease usually die before the age of 20. The effects are sometimes described as a type of childhood dementia.
Due to a faulty gene, before the treatment Oliver was unable to produce an enzyme crucial for keeping cells healthy.
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