A Molecular and Functional Brain Imaging Study in Individuals With Down Syndrome and Healthy Controls Following Single Dose RG1662

This study has been completed.
Information provided by (Responsible Party):
Hoffmann-La Roche
ClinicalTrials.gov Identifier:
First received: August 14, 2012
Last updated: September 1, 2015
Last verified: September 2015
This single-center, single-blind, placebo-controlled, parallel-group study with crossover component will evaluate the GABAAalpha5 receptor expression, occupancy and functional connectivity in the brains of individuals with Down syndrome and healthy controls following single dose RG1662. Participants will receive a single dose of placebo before the imaging session (PET and MRI), and a single dose of RG1662 before the second imaging session.

Condition Intervention Phase
Healthy Volunteer, Down Syndrome
Drug: RG1662
Drug: placebo
Phase 1

Study Type: Interventional
Study Design: Allocation: Randomized
Endpoint Classification: Pharmacodynamics Study
Intervention Model: Crossover Assignment
Masking: Single Blind (Subject)
Official Title: A Single-center, Single Blind Molecular and Functional Imaging Study to Assess GABAAalpha5 Receptor Expression, Occupancy and Functional Connectivity in the Brains of Individuals With Down Syndrome and Healthy Controls Following a Single Oral Administration of RG1662 or Placebo

Resource links provided by NLM:

Further study details as provided by Hoffmann-La Roche:

Primary Outcome Measures:
  • Brain GABAA receptor alpha5 subunit localization/density assessed by positron emission tomography (PET) [ Time Frame: approximately 1 day ] [ Designated as safety issue: No ]
  • Brain GABAA receptor alpha5 subunit occupancy following single dose of RG1662 [ Time Frame: approximately 1 day ] [ Designated as safety issue: No ]
  • Correlation of RG1662 plasma concentrations and GABAAalpha5 receptor occupancy [ Time Frame: approximately 12 months ] [ Designated as safety issue: No ]

Secondary Outcome Measures:
  • Safety: Incidence of adverse events [ Time Frame: approximately 12 months ] [ Designated as safety issue: No ]
  • Resting state functional brain connectivity following a single dose of either RG1662 or placebo, assessed by functional magnetic resonance imaging (fMRI) [ Time Frame: approximately 1 day ] [ Designated as safety issue: No ]
  • Functional brain connectivity of individuals with Down syndrome versus healthy controls receiving placebo [ Time Frame: approximately 12 months ] [ Designated as safety issue: No ]

Enrollment: 13
Study Start Date: August 2012
Study Completion Date: October 2013
Primary Completion Date: October 2013 (Final data collection date for primary outcome measure)
Arms Assigned Interventions
Placebo Comparator: Placebo Drug: placebo
Single oral dose
Experimental: RG1662 Drug: RG1662
Single oral dose


Ages Eligible for Study:   18 Years to 40 Years
Genders Eligible for Study:   Both
Accepts Healthy Volunteers:   Yes

Inclusion Criteria:

Healthy controls and individuals with Down syndrome:

  • Male and female adults, 18 to 40 years of age
  • Body mass index (BMI) 18 - 40 kg/m2 inclusive
  • Females of child-bearing potential and males with female partners of child-bearing potential must agree to use two medically approved methods of contraception, one of which must be a barrier method, for the duration of the study and for 4 months after the last study drug administration
  • Clinical laboratory values within normal limits or abnormalities considered not significant by the investigator and sponsor; individuals with thyroid disease may be included in the study provided they are euthyroid and stable on treatment for at least one month prior to screening

Individuals with Down syndrome must also meet the following:

  • Diagnosis of Down syndrome confirmed by karyotype; subjects may have free trisomy 21 or Robertsonian translocations; mosaic Down syndrome will be excluded
  • Individuals must have a parent or other reliable caregiver who agrees to accompany the inidvidual to all clinic visits, provide information about the individual as required by protocol, and be willing to give informed consent

Exclusion Criteria:

  • Regular smoker (>5 cigarettes or equivalent: 3 cigars, 6 cigarillos, 3 pipes per day)
  • Concomitant disease or condition or any clinically significant finding at screening that could interfere with, or for which the treatment might interfere with the conduct of the study, or that would, in the opinion of the investigator, pose an unacceptable risk to the subject in this study
  • Severe head trauma or CNS infections (e.g. meningitis)
  • History of epilepsy or seizures other than benign febrile convulsions of childhood
  • Any confirmed significant allergic reactions against any drug, anaphylaxis or severe environmental allergies as judged by the investigator
  • Positive for hepatitis B, hepatitis C or HIV infection
  • Positive urine test at screening or at follow-up for drugs of abuse, or positive alcohol breath test at screening and prior to dosing
  • Previous inclusion in research and/or medical protocol involving nuclear medicine, PET or radiological investigations with significant radiation burden (as defined by protocol)
  • Pregnant or lactating women
  • Individuals with evidence or meeting clinical diagnosis of dementia
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Please refer to this study by its ClinicalTrials.gov identifier: NCT01667367

United Kingdom
London, United Kingdom, NW10 7EW
Sponsors and Collaborators
Hoffmann-La Roche
Study Director: Clinical Trials Hoffmann-La Roche
  More Information

Responsible Party: Hoffmann-La Roche
ClinicalTrials.gov Identifier: NCT01667367     History of Changes
Other Study ID Numbers: BP25611  2012-001301-24 
Study First Received: August 14, 2012
Last Updated: September 1, 2015
Health Authority: United Kingdom: Medicines and Healthcare Products Regulatory Agency

Additional relevant MeSH terms:
Down Syndrome
Abnormalities, Multiple
Chromosome Disorders
Congenital Abnormalities
Genetic Diseases, Inborn
Intellectual Disability
Nervous System Diseases
Neurobehavioral Manifestations
Neurologic Manifestations
Pathologic Processes

ClinicalTrials.gov processed this record on May 30, 2016