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Clinical Trials in the UK / NCT06961344
Active, not recruiting Phase 2

An Open-label Extension Safety Study of MELAS Patients Who Completed TIS6463-203 (PRIZM)

NCT06961344 · tracked via the Priya Life Science UK tracker
Sponsor
Tisento Therapeutics
Phase
Phase 2
Started
2025-08-18
Last updated
2026-07-07

Condition(s) studied

Mitochondrial Encephalopathy, Lactic Acidosis and Stroke-Like Episodes (MELAS Syndrome)

Investigational drug(s) / intervention(s)

zagociguat 15mg

zagociguat 15mg: once daily oral tablets

Study summary

The goal of this clinical trial is to evaluate the long-term safety and tolerability of zagociguat in patients with MELAS who completed study medication treatment in the lead-in study TIS6463-203. TIS6463-204 is evaluating zagociguat in an open-label extension study at the daily dose of 15mg. The study medication is a once daily oral table and will be provided at the clinic and/or shipped to the participant's home. Study assessments will be conducted during clinic visits which will occur at three months and then at six months. Thereafter, clinic visits will occur every six months.

Eligibility

Sex
ALL
Min age
Max age
Healthy volunteers
No
Inclusion Criteria: 1. Signed an Institutional Review Board (IRB)/Independent Ethics Committee (IEC)-approved informed consent form (ICF). 2. Completed TIS6463-203 treatment through the Period 2 Week 12 Visit. 3. Agrees to follow lifestyle restrictions. 4. Other criteria per the protocol. Exclusion Criteria: 1\. Any medical condition or clinical finding that, per investigator judgement, would preclude safe study participation and/or completion of all trial requirements.

Primary outcome measure(s)

Trial sites (16)

FacilityCityRegionStatus
UC San Diego - Altman Clinical and Translational Research Institute La Jolla California
Children's Hospital of Colorado Aurora Colorado
Rare Disease Research Atlanta Georgia
Massachusetts General Hospital Boston Massachusetts
Mount Sinai - Ichan School of Medicine New York New York
Akron Children's Hospital Akron Ohio
Children's Hospital of Philadelphia Philadelphia Pennsylvania
Baylor College of Medicine Houston Texas
UT Health Houston Houston Texas
Neuroscience Research Australia Sydney New South Wales
Royal Melbourne Hospital Melbourne Victoria
LMU Klinikum, Friedrich-Baur-Institute, Department of Neurology Munich Germany
Neurologic Institute Carlo Besta of Milan Milan Italy
Fondazione Policlinico Universitario Agostino Gemelli Rome Italy
University College London Hospital. The National Hospital for Neurology and Neurosurgery, Centre for Neuromuscular Diseases London United Kingdom
The Newcastle upon Tyne NHS Foundation Trust Newcastle upon Tyne United Kingdom
Official registry record

This page summarises publicly available registry data for informational purposes — not medical advice. Eligibility is determined by each study team; patients should discuss participation with their clinician.

View NCT06961344 on ClinicalTrials.gov ↗ ← All trials in the UK