NCT06990984

A Dose-ranging Study of TTI-0102 in Adults and Children With Leigh Syndrome Spectrum (LSS)

A Phase 2a Partially Randomized, Placebo-controlled, Sequential Dose-ranging Study of TTI-0102 in Adults and Children With Leigh Syndrome Spectrum

• Status: Not Yet Recruiting
• Phase: Phase 2
• Study type: Interventional
• Enrollment: 18 (estimated)
• Sponsor: Thiogenesis Therapeutics, Inc. · Industry
• Sex: All
• Age: 5 Years – 55 Years
• Healthy volunteers: Not accepted

Summary

The goal of this clinical trial is to investigate oral TTI-0102 to evaluate its pharmacokinetics, safety, and preliminary efficacy in patients with Leigh syndrome spectrum, in three sequences. First sequence will be placebo-controlled and include 12 adolescents and adults weighing more than 40 kg. Second sequence will be open-label and include 3 adults and 3 children weighing 25-40 kg. Third sequence will also be open-label and will include 3 children weighing 20-25 kg. The main questions clinical trial aims to answer are: * Characterize the relationship between TTI-0102 drug levels by measuring 1. cysteamine pharmacokinetic (PK) parameters 2. pharmacodynamic (PD) efficacy measures * Generate a population PK model and determine dose level for later dosing groups * collect data to inform the design of a subsequent phase 2b/3 study of TTI-0102 in this patient population Participants will be asked to: * Take the study drug twice daily for 12 weeks * Visit the clinic for checkups and testing 7 times in total: once prior to study drug dosing, then 5 times over the 12-week treatment period and one more time a month after the last study drug dose.

Conditions

• Leigh Syndrome

Interventions

Type	Name	Description
DRUG	TTI-0102: cysteamine-pantetheine disulfide	TTI-0102: cysteamine-pantetheine disulfide, powder for dissolution in water for oral administration
DRUG	D-Mannitol	D-Mannitol

Timeline

• Start date: 2025-10-01
• Primary completion: 2026-09-01
• Completion: 2026-09-01
• First posted: 2025-05-25
• Last updated: 2025-07-11

Regulatory

• FDA-regulated drug study