• 1. Department of Nuclear Medicine, the Second People's Hospital of Chengdu, Chengdu, Sichuan 610017, P. R. China;
  • 2. Department of Nuclear Medicine, West China Hospital, Sichuan University, Chengdu, Sichuan 610041, P. R. China;
TANGGong-shun, Email: tgs010@163.com
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Objective To evaluate whether thyroglobin (Tg) value by radioimmunoassay (Tg-RIA) can be used as a complementary marker in differentiated thyroid cancer (DTC) patients, as serum Tg value is the key marker for the follow-up of patients with DTC, and endogenous antithyroglobulin (TgAb) interferes with serum Tg value by immunometric assay (Tg-IMA). Methods Fifty-five in-hospital patients with DTC after total thyroidectomy and 131I ablation during September and December 2012 were enrolled. Tg-IMA tests and Tg-RIA tests were performed separately. Diagnostic criteria about relapse, metastasis or disease-free status of thyroid carcinoma were established by serum Tg, diagnostic whole body scan (D-WBS), neck ultrasonography, chest CT and patients' history. Results Two DTC patients showed false negative Tg-IMA and true positive Tg-RIA. Five patients had false negative Tg-RIA because of low sensitivity of RIA. Four patients with weak positive Tg-IMA (1.07-4.09 μg/L) required follow-up. Among the 11 DTC patients with strong TgAb positivity (>115 kU/L), two patients with positive Tg-IMA and positive Tg-RIA received second operation or radioiodine therapy, seven patients had positive Tg-RIA and negative Tg-IMA. Five of the seven patients with strong positive TgAb needed further follow-up, and two of them received radioiodine therapy. Conclusion Tg value with radioimmunoassay is a complementary marker to find false negative Tg-IMA in follow-up patients with DTC.

Citation: HEJian, PANMing-zhi, HUANGRui, TANGGong-shun. The Complementary Role of Radioimmunoassay for Immunometric Assay of Thyroglobin. West China Medical Journal, 2014, 29(8): 1479-1482. doi: 10.7507/1002-0179.20140454 Copy

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