Clinical Trials Logo

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 high levels of PBR. 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, N-fluroacetyl-N-(2,5-dimethoxybenzyl)-2-phenoxyaniline ([(18)F]FBR), which showed much greater specific signals than [(11) C]PK11195 in non-human primates.

The major objective of this protocol is to assess the utility of [(18) F]FBR PET to detect neuroinflammation in patients with neurocysticercosis.

A secondary objective is to study whether some healthy subjects do not show binding of [(18)F]FBR by performing whole body imaging using [18F]FBR and binding assays using blood cells. In other protocols using a PET ligand with similar structure, [(11)C]PBR28, approximately 8% of subjects (9/~ 118 ) did not show binding. In protocols 07-N-0035 and 08-M-0158, we compared binding of [11C]PBR28 and [(11)C]PK 11195 in approximately ten healthy subjects including five who did not show binding of [(11)C]PBR28 in prior whole body imaging. We found differences in organs with regard to sensitivity to the phenomenon of non-binding. In the non-binders, PBR28 showed no binding in all five organs with high PBR density. However, PK 11195 showed significantly reduced binding in only two organs with PBR. We now wish to determine whether PBR06 is more similar to PBR28 or to PK 11195 in terms of the non-binding phenomenon. In the current protocol, in addition to whole body imaging using [(18)F]FBR, we will do in vitro binding assays using blood cells as another tissue to examine the effect of non-binding.

Study population

For [(18)F]FBR brain scans, ten 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). Fifteen healthy subjects will be recruited.

For whole body scan using [(18)F]FBR, additional 30 healthy subjects will be recruited. Therefore, total accrual numbers are 10 patients with neurocysticercosis and 45 healthy subjects (15 for brain [(18)F]FBR and 30 for whole body [(18)F]FBR scans.

Design

Ten patients with neurocysticercosis and 15 age-matched healthy subjects will have brain PET scans. In addition, we will also perform a whole body PET scan on 30 healthy subjects to study the radiation-absorbed doses and study whether some healthy subjects do not show binding of [(18)F]FBR. Patients will have up to three [(18)F]FBR PET scans during the follow-up and the treatment under 85-I-0127, typically a few weeks apart.

Outcome measures

<TAB>

In brain PET scans, [(18)F]FBR binding will be compared with clinical symptoms and MRI findings. In addition, the binding will be compared between patients and age-matched control subjects. We have calculated radiation absorbed doses in approximately seven healthy subjects who showed normal distribution (i.e., binders) of activity in organs. If we found subjects who appear to have no binding to [(18)F]FBR, we will calculate radiation-absorbed doses of the non-binders. ;


Study Design


Related Conditions & MeSH terms


NCT number NCT00527579
Study type Interventional
Source National Institutes of Health Clinical Center (CC)
Contact
Status Completed
Phase Phase 1
Start date September 4, 2007
Completion date November 26, 2013

See also
  Status Clinical Trial Phase
Terminated NCT00001844 - Study of New Magnetic Resonance Methods
Completed NCT03160261 - Effect of Exenatide on Cortisol Secretion Phase 4
Recruiting NCT03662100 - A Study of Two Formulations of LY3074828 in Healthy Participants Phase 1
Recruiting NCT02875301 - Investigating Gains in Neurocognition in an Intervention Trial of Exercise Phase 3
Recruiting NCT03670082 - Study With Lu AF35700 in Healthy Men and Women in Fasting and Fed State Phase 1
Not yet recruiting NCT03656952 - A Phase 1 Study to Evaluate the PF-06700841 Effect on QTc Interval in Healthy Volunteers Phase 1
Completed NCT03056846 - Probiotics on Stress-associated Gastrointestinal Function in University Students N/A
Completed NCT03203824 - The Effects of Dark Chocolate (70% Cacao) on EEG Brain Waves in Vigorously Active Individuals N/A
Recruiting NCT03114839 - Effect of Lactobacillus Casei Shirota on the Small Intestinal Microbiota (ROBIN) N/A
Completed NCT03224702 - First-in-Human Trial of Anti-ADAMTS-5 Nanobody in Healthy Volunteers Phase 1
Completed NCT03259464 - This Study Tests BI 685509 in Healthy Chinese and Japanese Men; the Study Tests How Different Doses of BI 685509 Are Taken up in the Body and How Well They Are Tolerated Phase 1
Completed NCT03309566 - Bioequivalence Study of Two Formulatiosns With the Asscociaton of Efavirenz, Emtricitabine and Tenofovir Phase 4
Completed NCT00526916 - PET Imaging of Peripheral Benzodiazepine Receptors in Patients With Neurocysticercosis Using [C-11]PBR28 Phase 1
Completed NCT03373162 - Functional Effects of Botox on the Brain Using MRS and fMRI Phase 4
Active, not recruiting NCT02509494 - Staged Phase 3 Study to Assess the Safety and Immunogenicity of Ebola Candidate Vaccines Ad26.ZEBOV and MVA-BN-Filo During Implementation of Stages 1 and 2 Phase 3
Terminated NCT02555085 - Single Ascending Doses of BIIB063 in Healthy Volunteers Phase 1
Completed NCT03125018 - Accuracy of SpO2 for Noninvasive Pulse Oximeter Sensor (LNCS ADTX) N/A
Completed NCT03124901 - Accuracy of Noninvasive Pulse Oximeter Measurement of Hemoglobin for Rainbow DCI Sensor N/A
Completed NCT00004556 - The Effects of Dextroamphetamine on Brain Function
Not yet recruiting NCT03617861 - Effect of Secretin in Functional Dyspepsia and Healthy Subjects Phase 1/Phase 2