A PET Study in Healthy Volunteers
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|ClinicalTrials.gov Identifier: NCT01424449|
Recruitment Status : Completed
First Posted : August 29, 2011
Last Update Posted : December 17, 2012
|Condition or disease||Intervention/treatment||Phase|
|Depressive Disorder||Radiation: [11C]PHNO Drug: Aripiprazole||Phase 1|
A test-retest (TRT) investigation of [11C]PHNO in human is required to further characterise [11C]PHNO. [11C] PHNO possesses very high affinity for the D3 receptor, and therefore most clinical studies are conducted at D3 occupancies >10%. As [11C]PHNO kinetics in the target brain regions are moderately slow, considerable mass carry over may be present on a 2nd PET scan conducted on the same day. In addition there appears to be a significant displaceable binding component in the cerebellum, which, if not accounted for, will lead to a bias in the quantification of specific [11C]PHNO binding. The aim of this study is therefore to examine the effects of [11C]PHNO mass carry-over and displaceable binding in the cerebellum, on the quantification of [11C]PHNO PET data.
This will be an open label, non-randomised [11C]PHNO PET study using healthy volunteers. Each volunteer will undergo 4 [11C]PHNO PET scans:
1st and 2nd scans; TRT on the same day with a minimal gap between [11C]PHNO injections to examine the effects of PHNO mass carry over, 3rd scan >1 week later to determine the "true" TRT variability and a 4th scan will follow a 15mg dose of aripiprazole (a D2/D3 compound which allows the highest clinically acceptable blockade of central D2/D3 receptors) and will examine the amount of displaceable binding in the cerebellum, a proposed reference tissue for [11C]PHNO.
The scan data will be quantified as regional volumes of distribution (VT).
|Study Type :||Interventional (Clinical Trial)|
|Actual Enrollment :||7 participants|
|Intervention Model:||Single Group Assignment|
|Masking:||None (Open Label)|
|Official Title:||A Positron Emission Tomography Study in Healthy Male Subjects to Examine the Test-retest Reliability of the D2/3 Agonist Radiotracer [11C]PHNO|
|Study Start Date :||January 2010|
|Actual Primary Completion Date :||July 2010|
|Actual Study Completion Date :||July 2010|
Experimental: no treatment
Aripiprazole is a D2/D3 antagonist registered in the UK for use in the treatment of schizophrenia. It allows the highest clinically acceptable blockade of central D2/D3 receptors and will allow us to examine the amount of displaceable binding in the brain - a proposed reference tissue for [11C]PHNO.
examine the effects of [11C]PHNO mass carry-over and displaceable binding
A 4th scan will follow a 15mg dose of aripiprazole (a D2/D3 compound which allows the highest clinically acceptable blockade of central D2/D3 receptors)
- volume of distribution [ Time Frame: one year ]Regional volume of distribution (VT) in sub-cortical, brainstem and cerebellar regions of interest at each PET scan.
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 ClinicalTrials.gov identifier (NCT number): NCT01424449
|GSK Investigational Site|
|London, United Kingdom, W12 ONN|
|Study Director:||GSK Clinical Trials||GlaxoSmithKline|