UCB: Two Studies Confirm the Efficacy of Kygevvi in TK2d
UCB: Two studies confirm the efficacy of Kygevvi in TK2d. The results document improvements in survival and function in treated patients, as well as the progressive burden of the disease in the absence of treatment.
Kygevvi Improves Survival and Function in Patients with TK2d
The first published study involves an integrated analysis of the safety and efficacy of Kygevvi (doxecitine and doxribtimine) in 104 treated patients and 114 untreated patients. The data indicates that the treatment has improved survival and functional outcomes in patients with genetically confirmed TK2d, with acceptable tolerance. Kygevvi, approved by the FDA in November 2025 and by the EMA in March 2026 under an exceptional procedure, remains the first and only authorized treatment for this indication in pediatric and adult patients with TK2d and symptom onset at age 12 or younger.
Untreated Disease Leads to Severe Progression and Early Mortality
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The second study reveals data from the largest published cohort of untreated TK2d patients, consisting of 257 individuals. This analysis highlights the progressive burden of the disease and the increased risk of early death in the absence of treatment. Untreated TK2d has serious impacts on daily life and life expectancy, particularly in patients whose symptoms appear at an early stage, underlining the urgent need for genetic diagnosis and access to treatments for this ultra-rare disease.
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