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

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. Read our disclaimer for details. Identifier: NCT00526916
Recruitment Status : Completed
First Posted : September 10, 2007
Last Update Posted : December 12, 2019
Information provided by (Responsible Party):
National Institutes of Health Clinical Center (CC) ( National Institute of Mental Health (NIMH) )

Brief 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.

Condition or disease Intervention/treatment Phase
Neurocysticercosis Healthy Drug: [C-11]PBR28 Phase 1

Detailed Description:


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.


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.

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Study Type : Interventional  (Clinical Trial)
Actual Enrollment : 18 participants
Allocation: Non-Randomized
Intervention Model: Parallel Assignment
Masking: None (Open Label)
Primary Purpose: Diagnostic
Official Title: PET Imaging of Peripheral Benzodiazepine Receptors in Patients With Neurocysticercosis Using [C-11]PBR28
Study Start Date : September 4, 2007
Actual Study Completion Date : September 5, 2014

Resource links provided by the National Library of Medicine

Primary Outcome Measures :
  1. Binding of [C-11]PBR28 at peripheral benzodiazepine receptors

Secondary Outcome Measures :
  1. MRI [ Time Frame: years ]

Information from the National Library of Medicine

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Ages Eligible for Study:   18 Years to 75 Years   (Adult, Older Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   Yes

Common to patients with neurocysticercosis and healthy subjects:

Ages between 18 and 75, inclusive.

Patients must meet the inclusion criteria of protocol 85-I-0127.


Are healthy based on history, physical exams, ECG, and lab tests.



Current psychiatric illness, substance abuse or severe systemic disease based on history and physical exam.

ECG with clinically significant abnormalities. Any existing physical exam and ECG within one year will be reviewed and if none already exists in the chart, these will be obtained and reviewed.

Prior participation in other research protocols or clinical care in the last year such that radiation exposure would exceed the annual guideline of RSC.

Pregnancy or breast feeding.


Positive HIV test.

Cannot lie on back for a few hours for the PET scans.

Presence of ferromagnetic metal in the body or heart pacemaker.


Medically unstable.

Seizures are not well controlled with medications.

A history of brain disease other than neurocysticercosis.

Laboratory tests with clinically significant abnormalities unrelated to neurocysticercosis or its treatment.


Laboratory tests with clinically significant abnormalities.

A history of brain disease.

The usage of nonsteroidal and other anti-inflammatory medications is not an exclusion criterion.

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): NCT00526916

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United States, Maryland
National Institutes of Health Clinical Center, 9000 Rockville Pike
Bethesda, Maryland, United States, 20892
Sponsors and Collaborators
National Institute of Mental Health (NIMH)
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Principal Investigator: Masahiro Fujita, M.D. National Institute of Mental Health (NIMH)
Publications automatically indexed to this study by Identifier (NCT Number):
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Responsible Party: National Institute of Mental Health (NIMH) Identifier: NCT00526916    
Other Study ID Numbers: 070208
First Posted: September 10, 2007    Key Record Dates
Last Update Posted: December 12, 2019
Last Verified: September 5, 2014
Keywords provided by National Institutes of Health Clinical Center (CC) ( National Institute of Mental Health (NIMH) ):
Taenia Solium
Compartment Model
Healthy Volunteer
Additional relevant MeSH terms:
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Central Nervous System Helminthiasis
Central Nervous System Parasitic Infections
Parasitic Diseases
Cestode Infections
Central Nervous System Infections
Central Nervous System Diseases
Nervous System Diseases