Clinical Evaluation of a New Highly Sensitive Thyroglobulin Assay in Differentiated Thyroid Carcinoma

Study Overview
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Brief Summary
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Human thyroglobulin (Tg) is the most sensitive biochemical marker for recurrence of differentiated cancer (DTC), especially after the complete removal of thyroid tissue through surgery and radioiodine therapy (RIT). Unfortunately, current assays for measuring Tg in blood samples are not sensitive enough to reliably measure Tg while patients are under thyroid hormone replacement therapy. Instead patients have to withdraw thyroid hormone for several weeks or receive costly injections of recombinant thyroid stimulating hormone (TSH) in order to raise Tg production by thyroid remnant and/or thyroid cancer cells so that it can be measured by current Tg assays. Other patients have antibodies against Tg that interfere in current immunoassays. The purpose of the study was to characterize a new highly sensitive assay for measuring Tg in the serum in thyroid cancer patients both on thyroid hormone therapy and off therapy in comparison to the normal routine assay already in use at Münster University Hospital.

Detailed Description
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Sera of 100 consecutive DTC patients after total thyroidectomy were to be collected at the Department of Nuclear Medicine both under TSH-suppression therapy and under endogenous TSH stimulation (TSH > 25 mU/l). All patients were staged by clinical examination, cervical ultrasound (7.5 MHz), I-131 whole-body scintigraphy and - where applicable - F18-FDG-PET. Written informed consent was obtained from all pts. Sera were taken in separation tubes without anticoagulants and stored at -20°C until analysis. Sera were allowed to come to room temperature prior to analysis. Tg, TgR and TgAb concentrations were determined by fully automated two-site chemiluminescence immunoassays (CLIA; Nichols Advantage®; Nichols Institute Diagnostics, San Clemente, California). All 3 assays are based on the identical highly purified hTg material for calibration (Tg), recovery (TgR) and antigen (TgAb; biotinylated and acridinium ester labeled) for optimum comparability of test results. In addition, Tg and TgR was measured by a fully automated two-site TRACE immunoassay (BRAHMS Kryptor®, Brahms AG, Hennigsdorf, Germany) and TSH with a 3rd-generation CLIA assay (TSH-3, Advia Centaur, Bayer Corporation).

Official Title
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Clinical Evaluation of a New Highly Sensitive Thyroglobulin Assay in Differentiated Thyroid Carcinoma

Conditions
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Thyroid Neoplasms

Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: histological diagnosis of differentiated thyroid carcinoma total or near total thyroidectomy informed consent Exclusion Criteria: no informed consent

Ages Eligible for Study
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Minimum Age: 0 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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differentiated thyroid carcinoma, thyroglobulin, immunoassay, thyroidectomy, radioiodine therapy