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A Phase 3 randomized, double-blind, placebo-controlled, parallel group, multicenter study with open-label extension to evaluate the efficacy and safety of fenfluramine hydrochloride in study participants with Rett syndrome

Status
Not yet recruiting
Phases
Phase 3
Study type
Interventional
Source
EU CTIS
Registry ID
CTIS2025-523157-34-00
Enrollment
9
Registered
2026-04-15
Start date
Unknown
Completion date
Unknown
Last updated
2026-04-15

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Rett syndrome

Brief summary

Change from Baseline to Week 14 in Rett Syndrome Behaviour Questionnaire (RSBQ) Total Score, Clinical Global Impression of Change (CGIC) Score at Week 14

Detailed description

Change from Baseline to Week 14 in Patient-Reported Outcomes Measurement Information System-Sleep Disturbance (PROMIS-SD) score, Change from Baseline to Week 14 in Observer-Reported Communication Ability (ORCA) score, Caregiver Global Impression of Change – Seizure (CaGIC-Seizure) score at Week 14, Incidence of Treatment-emergent adverse event (TEAEs), Incidence of serious TEAEs, Incidence of TEAEs leading to discontinuation, Incidence of related TEAEs, Change from Baseline in QT interval corrected using Fridericia’s formula (QTcF) interval on 12-lead ECG at Week 14, Treatment-emergent Doppler Echocardiogram (ECHO) results meeting the Food and Drug Administration (FDA) case definition of drug-associated valvular heart disease (VHD), Treatment-emergent Doppler ECHO results meeting the FDA case definition of pulmonary arterial hypertension (PAH) >35mmHg

Interventions

DRUGPlacebo matching < UCB PRODUCT (ZX008
DRUGfenfluramine hydrochloride oral solution) > and without active substance

Sponsors

UCB Biosciences Inc.
Lead SponsorOTHER

Eligibility

Sex/Gender
All
Age
0 Years to 64 Years

Design outcomes

Primary

MeasureTime frame
Change from Baseline to Week 14 in Rett Syndrome Behaviour Questionnaire (RSBQ) Total Score, Clinical Global Impression of Change (CGIC) Score at Week 14

Secondary

MeasureTime frame
Change from Baseline to Week 14 in Patient-Reported Outcomes Measurement Information System-Sleep Disturbance (PROMIS-SD) score, Change from Baseline to Week 14 in Observer-Reported Communication Ability (ORCA) score, Caregiver Global Impression of Change – Seizure (CaGIC-Seizure) score at Week 14, Incidence of Treatment-emergent adverse event (TEAEs), Incidence of serious TEAEs, Incidence of TEAEs leading to discontinuation, Incidence of related TEAEs, Change from Baseline in QT interval corrected using Fridericia’s formula (QTcF) interval on 12-lead ECG at Week 14, Treatment-emergent Doppler Echocardiogram (ECHO) results meeting the Food and Drug Administration (FDA) case definition of drug-associated valvular heart disease (VHD), Treatment-emergent Doppler ECHO results meeting the FDA case definition of pulmonary arterial hypertension (PAH) >35mmHg

Outcome results

None listed

Source: EU CTIS · Data processed: Apr 16, 2026