An Open Label Positron Emission Tomography (PET) Study of GSK618334 in Healthy Male Subjects Using 11C-PHNO as PET Ligand

Study Overview
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Brief Summary
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The purpose of this study is to investigate the relationship between the plasma concentrations of the study drug and the amount of the study drug bound to the D3 receptors of the brain after dosing of a new compound GSK618334.

Detailed Description
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This imaging study will be an open label, non-randomised PET receptor occupancy study using healthy male volunteers. The time course and degree of D3 receptor occupancy (RO) after single doses of GSK618334 will be determined using 11C-PHNO as a PET ligand labeling dopamine receptor. The PK/PD relationship between plasma concentrations of GSK618334 and D3 RO will be described. Potential relationships between D3 RO and functional magnetic resonance imaging (fMRI) endpoints will be assessed as an exploratory aim.

Official Title
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An Open Label Positron Emission Tomography Study in Healthy Male Subjects to Investigate Brain Dopamine D3 Receptor Occupancy, Pharmacokinetics and Safety of Single Oral Doses of GSK618334, Using 11C-PHNO as PET Ligand.

Conditions
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Substance Dependence

Intervention / Treatment
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* Drug: GSK618334


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: healthy, male subjects aged between 30 and 55 old inclusive. normal body weight. normal ECG and vital signs. agree to use acceptable contraceptive methods required. capable of giving written informed consent. Exclusion Criteria: smoker or uses other nicotine-containing products. certain medical conditions including heart disease, neurological disease, gastrointestinal disease, kidney or liver dysfunction - abnormal laboratory tests. certain psychiatric conditions and use of certain psychoactive drugs . positive blood alcohol or urine drug test. alcohol intake over 14 drinks per week. participation in another drug trial within 30 days or a study involving significant radiation exposure. donation of more than 450 mL blood within the 56 days. family history of cancer (one or more first-degree relative diagnosed before the age of 55 years old). having cardiac pacemaker or other electronic device. suffers from claustrophobia or feels that he will be unable to lie still on his back in the PET camera.

Ages Eligible for Study
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Minimum Age: 30 Years
Maximum Age: 55 Years

Sexes Eligible for Study
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Male

Accepts Healthy Volunteers
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Accepts Healthy Volunteers

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Treatment
Allocation: Non-Randomized
Intervention Model: Single Group Assignment
Masking: None (Open Label)


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: Open-label<br>D3 receptor antagonist | Drug: GSK618334<br>* D3 receptor antagonist<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Binding of PHNO, PET ligand, in each region of interest at each scan. |  | up to 48 hours | 
| Percentage of PHNO, PET ligand, occupancy in each region of interest after a single oral dose of GSK618334 for each individual. |  | up to 48 hours | 
| Time course of GSK618334 concentration in blood following a single oral dose. |  | up to 48 hours | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Adverse events and other safety assessments such as clinically relevant changes in electrocardiography (ECG); vital signs (blood pressure, heart rate); laboratory safety data and physical examination. |  | screening to follow-up | 
| Measuring GSK618334 in the body (pharmacokinetic endpoints): PK parameters of GSK618334 Cmax, AUCinf, tmax. |  | up to 48 hours | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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positron emission tomography, addiction