Study to Evaluate Serum Free Thyroxine (FT4) and Free Triiodothyronine (FT3) Measurements for Subjects Treated With Eslicarbazeine Acetate (ESL)

February 5, 2018 updated by: Sunovion

Ex-vivo Study to Evaluate Serum Free Thyroxine (FT4) and Free Triiodothyronine (FT3) Measurements Using Equilibrium Dialysis (ED) and Automated Kit Assay for Subjects Treated With Eslicarbazeine Acetate

The purpose of this research study is to determine if the blood tests used to measure free thyroid hormone levels are affected by a drug called eslicarbazepine acetate. To determine if eslicarbazepine acetate interferes with these blood tests, blood samples will be analysed so that researchers can compare different types of lab tests that measure these thyroid hormones. Half of the people who participate in this study will already be taking eslicarbazepine acetate either as a study drug or as a prescription (Part 1) and the other half will be people who do not take eslicarbazepine acetate (Part 2).

Study Overview

Status

Completed

Conditions

Intervention / Treatment

Detailed Description

Part 1 of the study will enroll a minimum of 30 male and female subjects who have received at least 1200 mg once daily (QD) ESL over a minimum 6-week period (ESL-exposed subjects). Subjects, who meet study eligibility requirements and provide written consent, will provide blood samples for measurement of thyroid hormones, thyroxine binding globulins (TBG), serum pregnancy (female subjects of childbearing potential 1only), thyroid peroxidase (TPO) antibodies, and ESL metabolites (eslicarbazepine and (R)-licarbazepine).

Optional blood samples will be requested from subjects in Part 1 who provide genetic consent and are eligible to participate (as controls) in a separate rash registry protocol. These samples will be tested for HLA typing, genetic ancestry, and viral titers (including human herpes virus [HHV]-6, HHV-7, and Epstein-Barr virus [EBV]).

ESL metabolites will be determined by a validated liquid chromatography- tandem mass spectrometry (LC-MS/MS) assay. Levels of FT4 and FT3 in ESL-exposed serum will be assayed using the automated kit assay (Roche Cobas ECLIA kits FT4 II and FT3 III) and Equilibrium Dialysis (ED) method. FT4 and FT3 results measured by both methods will be compared to evaluate potential assay differences. Serum TSH, TT4, TT3, and TBG in ESL treated subject samples will also be measured using automated kit assays.

Part 2 of the study will enroll a minimum of 30 age (± 5 y) and gender-matched non-ESL exposed volunteers. Subjects, who meet study eligibility requirements and provide written consent, will provide a blood sample for measurement of thyroid hormones, TBG, serum pregnancy (female subjects of childbearing potential only), and TPO antibodies. Serum samples obtained from non-ESL exposed subjects will be split into 4 aliquots, one aliquot will be used as the control blank (unspiked) and the rest spiked with 3 levels (high, low, and a concentration representative of therapeutic levels also called middle) of eslicarbazepine (range approximately 5 to 18 μg/mL) and (R)-licarbazepine (range approximately 0.5 to 1.8 μg/mL). The low concentration for spiking the non-ESL exposed samples will be approximately 1 standard deviation (SD) below Cavg associated with the 800 mg dose in chronic use in the epilepsy population and the high concentration for spiking will be approximately 1 SD above Cavg associated with the 1200 mg dose.

After sample is spiked with eslicarbazepine and (R)-licarbazepine, serum FT4 and FT3 will be measured by the automated kit assay method, as well as ED method. FT4 and FT3 measured in non-spiked and spiked volunteer samples will be compared to detect potential in vitro artifacts. Serum TSH, TT4, TT3, and TBG in non-spiked and spiked volunteer samples will also be measured using automated kit assays.

Study Type

Observational

Enrollment (Actual)

71

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

    • Arizona
      • Sun City, Arizona, United States, 85351
        • The More foundation/The Core Institute
    • Idaho
      • Boise, Idaho, United States, 83702
        • Consultans in Epilepsy & Neurology, PLLC
    • Kentucky
      • Lexington, Kentucky, United States, 40504
        • Bluegrass Epilepsy Research
    • Maryland
      • Bethesda, Maryland, United States, 20817
        • Mid-Atlantic Epilepsy Center
    • Minnesota
      • Golden Valley, Minnesota, United States, 55422
        • Minneapolis Clinic of Neurology
    • New York
      • New York, New York, United States, 10019
        • Clinilabs
    • Texas
      • Dallas, Texas, United States, 75251
        • NeurologicalClinic of Texas, P.A.

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

18 years and older (Adult, Older Adult)

Accepts Healthy Volunteers

Yes

Genders Eligible for Study

All

Sampling Method

Non-Probability Sample

Study Population

Males and Females greater than or equal to 18 years of age, either exposed to drug or not exposed to drug

Description

Inclusion Criteria:

  • ESL-exposed Subjects

    1. Subject must give written informed consent and privacy authorization prior to participation in the study.
    2. Male or female patient (≥ 18 years of age) who has received at least 1200 mg QD ESL for at least 6 weeks and has not experienced any rash or other allergic reaction at the time of blood draw.
  • Non-ESL-exposed Subjects

    1. Subject must give written informed consent and privacy authorization prior to participation in the study.
    2. Male or female healthy normal volunteer (≥ 18 years of age).

Exclusion Criteria:

  • Both ESL-exposed and non-ESL exposed subjects

    1. Subject who does not tolerate venipuncture or Has poor venous access that would cause difficulty for collecting blood samples.
    2. Subject with a history of thyroid disease or clinical condition (eg, renal insufficiency, Sjogren's syndrome, lupus, rheumatoid arthritis, pernicious anemia etc.) that in the opinion of the Investigator may effect levels of thyroid hormones, TBG, and/or TPO antibodies.
    3. Female subject who is pregnant.
    4. Female subject with a positive urine pregnancy test at screening.
    5. Subject who received any excluded medication for at least 30 days prior to blood draw.
    6. Subject has experienced significant blood loss and/or donated blood within last 60 days of blood draw.
    7. Subject intends to donate blood or undergo elective surgery within next 30 days following blood draw.
    8. Subject has donated plasma within last 72 hours of blood draw or intends to donate plasma during study participation.
    9. Subject is, in the opinion of the Investigator, unsuitable in any other way to participate in the study.

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
Eslicarbazepine acetate treated
Investigate the possibility of assay artifacts impacting the measurement of thyroid hormones, in particular FT4 and FT3, in ESL treated subjects compared to non-ESL-treated subjects.
Non-Eslicarbazepine acetate treated
Investigate the possibility of assay artifacts impacting the measurement of thyroid hormones, in particular FT4 and FT3, in ESL treated subjects compared to non-ESL-treated subjects.

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Time Frame
Comparison of Concentrations of Free Thyroid Hormones (FT4 and FT3) as Measured by ED and Automated Kit Assay Method in ESL-exposed Subjects
Time Frame: 1 day
1 day
Comparison of Concentrations of Free Thyroid Hormones (FT4 and FT3) as Measured by Automated Kit Assay in Non-ESL Exposed Subjects, With and Without the in Vitro Addition of Eslicarbazepine and (R)-Licarbazepine.
Time Frame: 1 day
1 day

Secondary Outcome Measures

Outcome Measure
Time Frame
Comparison of Concentrations of TT4, and TT3 as Measured in Non-ESL-exposed Subject Samples, With or Without the in Vitro Addition of Eslicarbazepine and (R)-Licarbazepine.
Time Frame: 1 day
1 day
Comparison of Concentrations of Free Thyroid Hormones (FT4 and FT3) in Spiked and Unspiked Volunteer Samples Using ED and Automated Kit Assay.
Time Frame: 1 day
1 day
Comparison of Concentrations of TSH,as Measured in Non-ESL-exposed Subject Samples, With or Without the in Vitro Addition of Eslicarbazepine and (R)-Licarbazepine.
Time Frame: 1 day
1 day

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

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

September 1, 2015

Primary Completion (Actual)

March 1, 2016

Study Completion (Actual)

March 1, 2016

Study Registration Dates

First Submitted

July 2, 2015

First Submitted That Met QC Criteria

July 6, 2015

First Posted (Estimate)

July 7, 2015

Study Record Updates

Last Update Posted (Actual)

February 7, 2018

Last Update Submitted That Met QC Criteria

February 5, 2018

Last Verified

February 1, 2018

More Information

Terms related to this study

Other Study ID Numbers

  • SEP093-451

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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