Ferrer and Prilenia Announce Authorization for EU Initiation of Confirmatory PRECISE-HD Study of Pridopidine in Huntington's Disease

BARCELONA, Spain, October 22, 2026--Ferreri and Prilenia Therapeutics B.V. today announced that the confirmatory Phase 3 PRECISE-HD study of investigational pridopidine in Huntington's disease (HD) has received authorization to begin in participating EU Member States (EU CT number: 2026-526093-16-00, NCT07609108). Recruitment in the EU is expected to commence this month, joining currently recruiting sites in the US and UK, with Canada to follow.

Designed to evaluate the efficacy and safety of pridopidine (administered as an oral capsule twice a day), and to generate data for regulatory evaluation, the global, approximately 400-participant, randomized, double-blind, placebo-controlled PRECISE-HD study will assess the clinical effect of the investigational treatment on disease progression, functional capacity, motor function, cognition, speech and quality of life.

"The initiation of PRECISE-HD in Europe marks a milestone for the Huntington's disease research community. This confirmatory Phase 3 study has been designed to build on learnings from previous research and to rigorously evaluate the efficacy and safety of pridopidine in people living with HD. As investigators, we look forward to working with participating centers and the HD community to generate robust evidence that can help us better understand the potential role of the study treatment in HD," said Dr. Ralf Reilmann, Principal Investigator and member of the PRECISE-HD Steering Committee.

"For people living with Huntington's disease and their families, every step toward a better understanding of the disease and potential treatment options matters. We welcome the involvement of European centers in PRECISE-HD and the continued focus on outcomes that reflect the realities and priorities of people living with HD and their families," said Astri Arnesen, President of the European Huntington Association.

"At Ferrer, putting our purpose into practice also means taking on complex scientific challenges, while recognizing the uncertainty inherent in research. The authorization to initiate PRECISE-HD in participating EU Member States is a further step in our work with Prilenia. We approach that work with a clear sense of responsibility: to conduct research with integrity and let the evidence lead the way," said Oscar Pérez, Chief Scientific Officer at Ferrer.

About HD

Huntington's disease (HD) is a rare, inherited, autosomal dominant, neurodegenerative disease that results in functional, motor, cognitive and behavioral symptoms, and ultimately leads to death. HD is caused by a mutation in the huntingtin (HTT) geneii, and each child of a parent with HD has a 50 percent chance of developing the diseaseiii.