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Natural History Study of Infants and Children With SCN1A-positive Dravet Syndrome (ENVISION)

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Know the risks and potential benefits of clinical studies and talk to your health care provider before participating. Read our disclaimer for details. Identifier: NCT04537832
Recruitment Status : Recruiting
First Posted : September 3, 2020
Last Update Posted : October 12, 2021
Information provided by (Responsible Party):
Encoded Therapeutics

Brief Summary:
This is a multicenter, prospective, 2-year observational study in subjects aged 6 to 60 months (at baseline), inclusive, with SCN1A-positive Dravet Syndrome.

Condition or disease Intervention/treatment
Dravet Syndrome Other: No Intervention

Detailed Description:
This is a prospective natural history study designed to further define the seizure, neurodevelopmental, motor and behavioral characteristics of SCN1A-positive Dravet Syndrome in children aged 6 to 60 months (at baseline) with SCN1A mutations. The study will examine these characteristics over 2 years using standardized assessments and will also explore the impact of the disease on parents/caregivers and health care resource utilization (HCRU).

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Study Type : Observational
Estimated Enrollment : 50 participants
Observational Model: Cohort
Time Perspective: Prospective
Official Title: ENVISION: Natural History Study of Infants and Children With SCN1A-positive Dravet Syndrome
Actual Study Start Date : January 18, 2021
Estimated Primary Completion Date : June 25, 2024
Estimated Study Completion Date : June 25, 2024

Group/Cohort Intervention/treatment
Group 1
Subjects from 6 through 60 months of age (at baseline) who have SCN1A+ Dravet Syndrome. Clinical, neurocognitive, laboratory, the burden of disease, and health care resource utilization will be assessed.
Other: No Intervention
No Intervention

Primary Outcome Measures :
  1. Seizure burden [ Time Frame: Every 3 months from Baseline through Month 24 ]
    Measured using monthly seizure frequency derived from seizure diaries

  2. Seizure freedom [ Time Frame: Within each 6-month interval starting from Baseline through Month 24 ]
    Measured using the proportion of seizure-free days observed between two-time points in the seizure diaries

  3. Motor functioning [ Time Frame: Baseline, Months 6, 12, 18; and Month 24 ]
    Measured using binary outcomes (achieved vs. not achieved) of 6 motor items adapted from the Bayley Scales of Infant and Toddler Development instrument. Motor milestones include: (1) Sit unassisted for 30 seconds; (2) Walk with assistance; (3) Stand alone; (4) Walk alone; (5) Walk upstairs; and (6) Jump forward

  4. Use of anti-epileptic drug [ Time Frame: Baseline, Months 6, 12, 18 and 24 ]
    Measured using the incidence of anti-epileptic drug usage observed between two time points in the clinical database. Endpoint will be calculated within each 6-month interval from starting from Baseline through Month 24

  5. Use of Ketogenic Diet [ Time Frame: Baseline, Months 6, 12, 18 and 24 ]
    Measured using the incidence of ketogenic diet usage between two time points. Endpoint will be calculated within each 6-month interval from starting from Baseline through Month 24

  6. Cognitive functioning [ Time Frame: Baseline, Months 6, 12, 18 and 24 ]
    • Measured using composite scores from 5 domains in the Bayley Scales of Infant and Toddler Development instrument. Domains include: (1) Cognitive; (2) Language; (3) Motor; (4) Social-Emotional; and (5) General Adaptive
    • Composite scores are normalized to a mean and SD of 100 and 15, respectively (range is not applicable as the scores are unbounded). Higher scores correspond to better outcomes compared to a normal population

  7. Behavioral and social functioning [ Time Frame: Baseline, Months 3, 9, 15, 21 and 24 ]
    • Measured using raw scores from 2 domains in the Brief Infant Toddler Social Emotional Assessment. Domains include: (1) Problem; and (2) Competence
    • Domain raw scores range from 31 to 93 and 11 to 33 for the Problem and Competence domains, respectively. Higher Problem scores correspond to worse outcomes. Higher Competence scores correspond to better outcomes

  8. Incidence of Adverse Events [ Time Frame: Baseline through Month 24 ]
    Measured using the incidence of adverse events and serious adverse events (broken down by preferred term) observed between two time points during the study

  9. Overall survival [ Time Frame: Baseline through Month 24 ]
    Measured using the incidence of death observed by a given time point during the study

Biospecimen Retention:   Samples With DNA

Information from the National Library of Medicine

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Ages Eligible for Study:   6 Months to 60 Months   (Child)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No
Sampling Method:   Probability Sample
Study Population
Children aged 6 to 60 months with SCN1A-positive Dravet Syndrome.

Inclusion Criteria:

  • Confirmed SCN1A mutation.
  • Normal development prior to onset of first seizure as defined by the Centers for Disease -Control and Prevention (CDC 2019).
  • Onset of seizures between age 3 and 15 months, inclusive.

Exclusion Criteria:

  • Copy number variant of SCN1A, including SCN1A microdeletion, if affecting other genes.
  • SCN1A mutation present on both alleles. Known pathogenic or clinically suspected mutation in a seizure-associated gene besides SCN1A.
  • Confirmed mutation in a gene besides SCN1A, as determined by an Independent Adjudication Committee, that is known to increase the severity of the seizure phenotype.
  • Subject has a known gain-of-function genetic mutation, as defined by functional studies, including p.Thr226Met.
  • History of notable developmental deficit that was evident prior to seizure onset.
  • Known central nervous system structural abnormality as found on magnetic resonance imaging or computed tomography scan of brain.
  • Repeated or prolonged (>6 consecutive weeks) exposure to anti-epileptic drugs (AEDs) that are contraindicated in SCN1A-positive Dravet Syndrome, including sodium channel blockers.

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its identifier (NCT number): NCT04537832

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Contact: Encoded Patient Advocacy +1 (650) 398-4301

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United States, California
Children's Hospital Los Angeles Recruiting
Los Angeles, California, United States, 90027
Contact: Martha Arellano-Garcia   
UCSF Benioff Children's Hospital Recruiting
San Francisco, California, United States, 94143
Contact: Antoinette Swanson    415-502-1921   
United States, Colorado
Children's Hospital Colorado Recruiting
Aurora, Colorado, United States, 80045
Contact: Galen Resler    720-777-0738   
Contact: Kelly Knupp, MD    720-777-6895   
United States, Florida
Nicklaus Children's Hospital Recruiting
Miami, Florida, United States, 33155
Contact: Leisa Tamayo Nenninger   
United States, Illinois
Ann and Robert H. Lurie Children's Hospital of Chicago Recruiting
Chicago, Illinois, United States, 60611
Contact: Nasim Alexander   
United States, New Jersey
Northeast Regional Epilepsy Group Recruiting
Hackensack, New Jersey, United States, 07601
Contact: Victoria Sica   
United States, Ohio
Abigail Wexner Research Institute at Nationwide Children's Hospital Recruiting
Columbus, Ohio, United States, 43205
Contact: Sara Eldred    614-722-2607   
United States, Oregon
Oregon Health and Science University Recruiting
Portland, Oregon, United States, 97239
Contact: Beata Dyar    503-494-8216   
United States, Pennsylvania
Children's Hospital of Philadelphia Recruiting
Philadelphia, Pennsylvania, United States, 19104
Contact: Rashmi Risbud    215-590-3057   
United States, Tennessee
Le Bonheur Children's Hospital Recruiting
Memphis, Tennessee, United States, 38103
Contact: Farimah Salami, PhD, MS   
United States, Texas
Cook Children's Medical Center Recruiting
Fort Worth, Texas, United States, 76104
Contact: Dianna Grado, R.N.   
United States, Washington
Multicare Institute for Research and Innovation Recruiting
Tacoma, Washington, United States, 98405
Contact: Amber Brown    253-403-9350   
Australia, Victoria
Austin Hospital - Melbourne Brain Centre Recruiting
Heidelberg, Victoria, Australia, 3084
Contact: Greesha Zacharia    +61 3 9035 7361   
Hospital de la Santa Creu i Sant Pau Recruiting
Barcelona, Spain
Contact: Roser Ribosa-Nogué    +34 93 5537075   
United Kingdom
Queen Elizabeth Hospital Recruiting
Glasgow, United Kingdom, G51 4TF
Contact: Dr. Andreas Brunklaus   
Sponsors and Collaborators
Encoded Therapeutics
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Study Director: Salvador Rico, M.D., Ph.D Encoded Therapeutics
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Responsible Party: Encoded Therapeutics Identifier: NCT04537832    
Other Study ID Numbers: ETX-DS-001
First Posted: September 3, 2020    Key Record Dates
Last Update Posted: October 12, 2021
Last Verified: November 2020
Individual Participant Data (IPD) Sharing Statement:
Plan to Share IPD: Undecided
Plan Description: Plan is undecided

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Studies a U.S. FDA-regulated Drug Product: No
Studies a U.S. FDA-regulated Device Product: No
Keywords provided by Encoded Therapeutics:
severe myoclonic epilepsy
severe myoclonic epilepsy of infancy
SCN1A related seizure disorder
epileptic encephalopathy
Additional relevant MeSH terms:
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Epilepsies, Myoclonic
Pathologic Processes
Epilepsy, Generalized
Brain Diseases
Central Nervous System Diseases
Nervous System Diseases
Epileptic Syndromes