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In page Alkaptonuria:

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The DevelopAKUre trials concluded in 2019 and successfully illustrated that nitisinone lowered levels of homogentisic acid (HGA), the acid that causes the damage in AKU, by 99% which effectively halts the progression of the disease. In 2020, the European Medicines Agency and the European Commission approved the use of nitisinone for treating AKU making the treatment available to patients across the Europe and the UK.[citation needed]