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European Commission Approves First Treatment for Rare Mitochondrial Disease TK2d

Mar 31, 2026

The European Commission has approved KYGEVVI (doxecitine and doxribtimine) as the first treatment for thymidine kinase 2 deficiency (TK2d), an ultra-rare mitochondrial disease. Clinical studies showed the drug reduces death risk by 95% and helps 84% of patients regain motor functions. The approval covers pediatric and adult patients with symptom onset before age 12.