PET Imaging of Peripheral Benzodiazepine Receptors in Patients With

Status Completed

Clinical Trial Summary

The purpose of this protocol is to measure peripheral benzodiazepine receptors in the brain using positron emission tomography (PET) and compare the imaging results between patients and healthy people.

Clinical Trial Description

Objective

In endemic regions neurocysticercosis is the most common cause of adult acquired epilepsy and thus an important public health problem. The disease is caused by infection with the larval form of the tapeworm, Taenia solium. Although neurocysticercosis is common only in many developing regions, an increased number of patients are diagnosed in developed countries mostly due to immigration of infected individuals.

The peripheral benzodiazepine receptor (PBR) can be a clinically useful marker to detect neuroinflammation because activated microglia in inflammatory areas expresses much greater levels of PBR than in microglia in resting conditions. PBR has been imaged with positron emission tomography (PET) using [(11)C]1-(2-chlorophenyl-N-methylpropyl)-3-isoquinoline carboxamide (PK11195), which provides low levels of specific signal. Recently we developed a new ligand, [(11)C]N-acetyl-N-(2-methoxybenzyl)-2-phenoxy-5-pyridinamine (PBR28), which showed much greater specific signal than [(11)C]PK11195 in non-human primates.

The major objective of this protocol is to assess the utility of [(11)C]PBR28 PET to detect neuroinflammation in patients with neurocysticercosis.

Study population

Thirty patients will be recruited and clinically followed under protocol 85-I-0127, Treatment of Cysticercosis including Neurocysticercosis with Praziquantel or Albendazole, (PI: Theodore E. Nash, MD, NIAID). Thirty healthy subjects will be recruited.

Design

Fifteen patients with neurocysticercosis and the first 15 age-matched healthy subjects will have brain PET scans. Patients will have up to three [(11)C]PBR28 PET scans during the follow-up and the treatment under 85-I-0127, typically a few weeks apart.

Outcome measures

PBR28 binding will be compared with clinical symptoms and MRI findings. In addition, the binding will be compared between patients and age-matched control subjects because the high levels of specific binding may allow detection of an increase of PBR in regions where MRI does not detect inflammation. ;

Study Design

Related Conditions & MeSH terms

Clinical Trial Details

NCT number	NCT00526916
Study type	Interventional
Source	National Institutes of Health Clinical Center (CC)
Contact
Status	Completed
Phase	Phase 1
Start date	September 4, 2007
Completion date	September 5, 2014

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Clinical trials are conducted in a series of steps, called phases - each phase is designed to answer a separate research question.

Phase 1: Researchers test a new drug or treatment in a small group of people for the first time to evaluate its safety, determine a safe dosage range, and identify side effects.
Phase 2: The drug or treatment is given to a larger group of people to see if it is effective and to further evaluate its safety.
Phase 3: The drug or treatment is given to large groups of people to confirm its effectiveness, monitor side effects, compare it to commonly used treatments, and collect information that will allow the drug or treatment to be used safely.
Phase 4: Studies are done after the drug or treatment has been marketed to gather information on the drug's effect in various populations and any side effects associated with long-term use.

PET Imaging of Peripheral Benzodiazepine Receptors in Patients With Neurocysticercosis Using [C-11]PBR28

Clinical Trial Summary

Clinical Trial Description

Study Design

Related Conditions & MeSH terms