AstraZeneca PLCFDA accepted and granted priority review to AstraZeneca's efzimfotase alfa filing for HPP, shortening the review by four months.
AstraZeneca said the FDA accepted its regulatory filing for the investigational enzyme replacement therapy efzimfotase alfa in patients aged two years and older with hypophosphatasia, or HPP, and granted the application priority review, shortening the review period by four months, with a final decision expected during the first half of 2027. The filing is supported by data from three phase III studies: MULBERRY met its primary endpoint in treatment-naive children aged two to less than 12 years old, showing a significant improvement in bone health, and CHESTNUT showed that patients switching from Strensiq could maintain the benefits of treatment, while HICKORY did not meet its primary endpoint in treatment-naive individuals aged 12 years and older, though AstraZeneca reported a numerical improvement, particularly in patients with pediatric-onset disease. The company said efzimfotase alfa was generally well-tolerated with an acceptable safety profile across the three studies. The commercial angle rests on Strensiq, the established HPP treatment AstraZeneca gained through its 2021 acquisition of Alexion, which was approved by the FDA in 2015 as the first bone-targeted enzyme replacement therapy for HPP and generated $1.05 billion in sales in the first half of 2026, up 41% year over year. Efzimfotase alfa is designed to require lower injection volumes and substantially less frequent dosing, once every two weeks, compared with Strensiq's three- or six-times-weekly regimen. Elsewhere in the space, BioMarin Pharmaceutical entered HPP through its acquisition of Alesta Therapeutics, completed earlier this month, paying $275 million upfront with up to $215 million in additional milestone payments for ALE1, an oral small-molecule therapy in a phase I/IIa study, while Recursion Pharmaceuticals is developing the oral ENPP1 inhibitor REC-102, formerly REV102, which remains in IND-enabling studies with a data-driven decision on a phase I study expected before the end of this year.
AstraZeneca PLCFDA accepted and granted priority review to AstraZeneca's efzimfotase alfa filing for HPP, shortening the review by four months.
Biomarin Pharmaceutical IncBioMarin entered HPP via its Alesta Therapeutics acquisition, positioning ALE1 as a rival oral therapy to AstraZeneca's efzimfotase alfa.
Recursion Pharmaceuticals IncAlexion's Strensiq is the established HPP treatment whose franchise is reinforced by the efzimfotase alfa filing and its $1.05B first-half 2026 sales.