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PTC’s Phase III Data Sets Up PKU Competition With BioMarin

 
• By Joseph Haas

Phase III data for PTC’s sepiapterin shows statistically significant reduction of blood phenylalanine levels in patients with phenylketonuria. BioMarin has the only two approved drugs for PKU.

Rare disease
PTC hopes to bring a competitor to BioMarin's PKU drugs to market • Source: Shutterstock

Rare disease-focused PTC Therapeutics, Inc. unveiled Phase III data for its phenylketonuria (PKU) candidate sepiapterin (PTC923) on 17 May that looks capable of positioning the oral synthetic drug to compete with BioMarin Pharmaceutical Inc.’s two approved PKU therapies. But, while PTC highlighted data from a subset of more severe PKU patients, at least one analyst questioned whether the sample size would be large enough to win sepiapterin a broad label indication.

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