- ICH GCP
- US Clinical Trials Registry
- Clinical Trial NCT01976078
Development of Voriconazole Pharmacokinetics and Metabolism in Children and Adolescents
February 16, 2018 updated by: Michael Neely, Children's Hospital Los Angeles
Ontogeny of Voriconazole Pharmacokinetics and Metabolism in Children and Adolescents
The death rate in children from the invasive fungal infection called aspergillosis is more than 50%.
Voriconazole is the first-line therapy for this infection.
In a previous publication the investigators have shown a highly significant relationship between voriconazole plasma concentrations and survival.
However, voriconazole dosing is currently poorly established, and plasma drug exposure varies between children by 400% or more, even after intravenous dosing.
The objective of this study is to investigate the reasons for this variability in voriconazole pharmacokinetics (PK).In two studies, the investigators will enroll 80 children/adolescents receiving oral or intravenous voriconazole, divided by age under 2 years (n=15), and 2-18 years (n=65).
From each patient the investigators will collect the following: 1) a blood sample for detection of several genetic changes known to affect drug metabolizing enzyme (DME) activity; 2) up to 9 blood samples after a voriconazole dose for measurement of voriconazole ("PK sampling"); 3) follow-up samples after each PK sampling visit if necessary to adjust the dose so that voriconazole concentrations in the blood are satisfactory (known as therapeutic drug monitoring or TDM).
At the time of the voriconazole dose prior to the PK sampling, we will also give single IV or oral (corresponding to the route of voriconazole administration) low doses of esomeprazole (an antacid), midazolam (a sedative), and ranitidine (an antacid) as a cocktail to test or probe DME activity.
All of these medications are used commonly in children already.
The investigators will estimate DME activity or phenotype using ratios of probe drug metabolite to parent drug concentrations, while simultaneously quantifying the amount of DME genetic material (mRNA) and protein in white blood cells.
The investigators will test associations between DME activity, mRNA, protein, voriconazole PK, age, sex, and degree of illness.
The investigators will also use a computer program to integrate all these data to develop a comprehensive model that will predict blood concentrations of voriconazole in children of all ages, as well as assist physicians and pharmacists to dose voriconazole more accurately.The total study duration for each subject will be until after the TDM follow up visit, generally about one week.
Study Overview
Status
Completed
Conditions
Intervention / Treatment
Study Type
Observational
Enrollment (Actual)
45
Contacts and Locations
This section provides the contact details for those conducting the study, and information on where this study is being conducted.
Study Locations
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California
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Los Angeles, California, United States, 90027
- Children's Hospital Los Angeles
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Participation Criteria
Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.
Eligibility Criteria
Ages Eligible for Study
No older than 18 years (Child, Adult)
Accepts Healthy Volunteers
No
Genders Eligible for Study
All
Sampling Method
Probability Sample
Study Population
Children with an invasive fungal infection
Description
Inclusion Criteria:
- Participants will be enrolled before their 18th birthday.
- Participant/parent/legal guardian must be able and willing to provide signed informed consent.
Laboratory values obtained within 7 days prior to study entry (obtained for clinical purposes)
- Hemoglobin ≥ 7.0 g/dL (transfusion dependence acceptable)
- Aspartate aminotransferase (AST) (SGOT), alanine aminotransferase (ALT) (SGPT), and total bilirubin ≤ 5 X upper limit of age-appropriate normal (ULN)
- Serum creatinine ≤ 3 X ULN
Exclusion Criteria:
- Pregnancy
- Active substance abuse or other psychiatric illness that would prevent adherence to the study protocol. Investigators will not record this information in the screening log, and the information will be obtained from existing documents in the medical record only.
- Known hypersensitivity or intolerance to study medications
- Not expected to survive >1 week.
- Weight < 4.5 kg (blood volume draw limitations)
Study Plan
This section provides details of the study plan, including how the study is designed and what the study is measuring.
How is the study designed?
Design Details
Cohorts and Interventions
Group / Cohort |
Intervention / Treatment |
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Midazolam/Ranitidine/Esomeprazole
All enrolled subjects will have a study pharmacokinetic visit where they will be given the above cocktail of drugs along with their clinically indicated voriconazole dose, followed by blood sampling over the next 12 hours.
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Each of the three drugs will be given at 10% of their usual doses for age/weight.
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What is the study measuring?
Primary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Voriconazole steady-state pharmacokinetics
Time Frame: During the 12 hours after a dose
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8 (after intravenous dosing) or 9 (after oral dosing) samples are taken after a voriconazole dose over a 12 hour timeframe.
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During the 12 hours after a dose
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Secondary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Voriconazole drug metabolizing enzyme activity
Time Frame: Within 12 hours after a study medication dosing
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At the time of the voriconazole dose used for the primary outcome, an intravenous or oral cocktail of "probe drugs", depending on the route of the voriconazole dose, consisting of midazolam, ranitidine, and esomeprazole will be administered.
Using the samples collected for the primary outcome, concentrations of all three probe drugs and their major metabolites will be measured and used to compute activity of the relevant drug metabolizing enzymes.
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Within 12 hours after a study medication dosing
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Other Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Accuracy of computer software for Bayesian dose optimization of voriconazole in individual patients
Time Frame: Within 4 weeks of study completion for each subject
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Using existing voriconazole pharmacokinetic data, we have constructed a population model of the drug's behavior in children and adults.
We are testing the use of this model in study subjects to compare the doses predicted by the software to achieve actual, measured voriconazole concentrations obtained for routine clinical care after the study PK visit, with the real doses that were administered and resulted in those measured voriconazole concentrations.
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Within 4 weeks of study completion for each subject
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Collaborators and Investigators
This is where you will find people and organizations involved with this study.
Sponsor
Collaborators
Investigators
- Principal Investigator: Michael N Neely, MD, Children's Hospital Los Angeles
Publications and helpful links
The person responsible for entering information about the study voluntarily provides these publications. These may be about anything related to the study.
General Publications
- Hope WW, Vanguilder M, Donnelly JP, Blijlevens NM, Bruggemann RJ, Jelliffe RW, Neely MN. Software for dosage individualization of voriconazole for immunocompromised patients. Antimicrob Agents Chemother. 2013 Apr;57(4):1888-94. doi: 10.1128/AAC.02025-12. Epub 2013 Feb 4.
- Neely M, Rushing T, Kovacs A, Jelliffe R, Hoffman J. Voriconazole pharmacokinetics and pharmacodynamics in children. Clin Infect Dis. 2010 Jan 1;50(1):27-36. doi: 10.1086/648679.
- Neely M, Margol A, Fu X, van Guilder M, Bayard D, Schumitzky A, Orbach R, Liu S, Louie S, Hope W. Achieving target voriconazole concentrations more accurately in children and adolescents. Antimicrob Agents Chemother. 2015;59(6):3090-7. doi: 10.1128/AAC.00032-15. Epub 2015 Mar 16.
Study record dates
These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.
Study Major Dates
Study Start (Actual)
September 1, 2012
Primary Completion (Actual)
April 22, 2015
Study Completion (Actual)
April 22, 2015
Study Registration Dates
First Submitted
September 18, 2013
First Submitted That Met QC Criteria
October 29, 2013
First Posted (Estimate)
November 5, 2013
Study Record Updates
Last Update Posted (Actual)
February 20, 2018
Last Update Submitted That Met QC Criteria
February 16, 2018
Last Verified
February 1, 2018
More Information
Terms related to this study
Keywords
Additional Relevant MeSH Terms
- Physiological Effects of Drugs
- Neurotransmitter Agents
- Molecular Mechanisms of Pharmacological Action
- Central Nervous System Depressants
- Enzyme Inhibitors
- Anesthetics, Intravenous
- Anesthetics, General
- Anesthetics
- Gastrointestinal Agents
- Tranquilizing Agents
- Psychotropic Drugs
- Hypnotics and Sedatives
- Adjuvants, Anesthesia
- Anti-Anxiety Agents
- GABA Modulators
- GABA Agents
- Anti-Ulcer Agents
- Proton Pump Inhibitors
- Histamine Antagonists
- Histamine Agents
- Histamine H2 Antagonists
- Midazolam
- Ranitidine
- Ranitidine bismuth citrate
- Esomeprazole
Other Study ID Numbers
- CCI-11-00334
- R01HD070996 (U.S. NIH Grant/Contract)
This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.
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