A Phase 2b Study of Zagociguat in Patients With MELAS

Phase 2Active Not RecruitingNCT06402123

Tisento Therapeutics43 enrolled

Overview

PRIZM is a Phase 2b randomized, double-blind, placebo-controlled, 3-treatment, 2-period, crossover study evaluating the efficacy and safety of oral zagociguat 15 and 30 mg vs. placebo when administered daily for 12 weeks in participants with genetically and phenotypically defined MELAS.

The goal of this clinical trial is to learn about the effectiveness of zagociguat in patients with MELAS. The main questions it aims to answer are: * Does zagociguat improve fatigue in patients with MELAS? * Does zagociguat improve cognitive performance in patients with MELAS? * What is the safety and tolerability profile of zagociguat? The PRIZM study is evaluating 2 dose levels of zagociguat in a crossover design consisting of two 12-week treatment periods separated by a 4-week washout. Patients will be screened and if eligible, randomly assigned either to receive placebo in period 1 followed by active drug in period 2 OR to receive active drug in period 1 followed by placebo in period 2. Study medication is a once daily oral tablet and will be provided at the clinic and/or shipped to the participant's home. Clinic visits will occur at screening and Week 1 and Week 12 of each treatment period. Visits at Week 4 and Week 8 of both crossover periods will either be in clinic or optionally at the participant's home. Study assessments will be conducted weekly on a phone app and a separate tablet and additional assessments will be conducted during visits. Patients who complete the study will be eligible for an open label extension study.

Study Type

INTERVENTIONAL

Allocation

RANDOMIZED

Purpose

TREATMENT

Masking

QUADRUPLE

Enrollment

Conditions

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

Interventions

zagociguat 15mgDRUG

Once-daily oral tablets

zagociguat 30mgDRUG

Once-daily oral tablets

PlaceboDRUG

Once-daily oral tablets

Eligibility

Sex: ALLMin age: 18 YearsMax age: 75 Years

Medical Language ↔ Plain English

Inclusion Criteria: 1. Signed consent form. 2. 18 to 75 years of age. 3. Diagnosed with MELAS based on the presence of each of the following criteria: 1. A documented pathogenic variant in a mitochondrial DNA (mtDNA) gene. 2. History of one or more stroke-like episodes (SLEs) with magnetic resonance imaging (MRI) findings consistent with stroke-like lesions. 4. Scores below normal average on the iDSST and GMLT. 5. Reports fatigue due to MELAS. 6. Can complete at least 1 sit-to-stand in the 30-second test interval. 7. Completes all at-home weekly activities independently during the Screening Period (caregiver may help set up device/app, log-in, etc.). 8. Other criteria per the protocol. Exclusion Criteria: 1. Systolic blood pressure (BP) 90 mmHg or diastolic BP 60 mmHg. 2. Orthostatic hypotension when measured after standing from a semi-recumbent/supine position. 3. Active cancer significant enough to confound the results of this study. 4. Severe gastrointestinal dysmotility that may impact participation. 5. Recent history (within last 6 months) of platelet dysfunction, hemophilia, von Willebrand disease, coagulation disorder, other bleeding diathesis condition(s), or significant, nontraumatic bleeding episodes. 6. History of spontaneous fracture(s) that in the investigator's opinion represents a safety risk for trial participation. 7. Current use of prohibited medication (reviewed by investigator). 8. Any medical or other condition that the investigator thinks would preclude study participation. 9. Other exclusion criteria per protocol.

Locations (21)

UC San Diego - Altman Clinical and Translational Research Institute

La Jolla, California, United States

Outcomes

Primary Outcomes

• PROMIS Fatigue MELAS Short Form scores• Groton Maze Learning Test scores • International Digit Symbol Substitution Test scores

These measures are a patient reported questionnaire on MELAS-specific fatigue and 2 cognitive performance tests. These 3 outcome measures will be combined using a global statistical test.

Time frame: Weeks 9 through 12 of each treatment period

Incidence of Treatment-emergent Adverse Events (TEAEs)

TEAEs are any untoward event that may or may not be related to study medication.

Time frame: Weeks 1 through washout for treatment period 1 and Weeks 1 through follow-up for treatment period 2

Secondary Outcomes

Number of repetitions completed during the 30-second sit-to-stand test

Leg strength and exercise intolerance

Time frame: Week 12

PROMIS Cognitive Function MELAS Short Form (PCFM-SF) score

Patient-reported questionnaire on MELAS-specific cognitive function

Time frame: Week 12

Plasma concentrations of GDF-15

Measure of disease pathophysiology

Time frame: Week 12

Memory composite scores (One Card Learning and One Back Tests) for Week 9 through 12

Test of memory

Time frame: Week 9 through 12

Data from ClinicalTrials.gov

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