alexa Detection of recurrent thyroid cancer by sensitive nested reverse transcription-polymerase chain reaction of thyroglobulin and sodium iodide symporter messenger ribonucleic acid transcripts in peripheral blood.
Diabetes & Endocrinology

Diabetes & Endocrinology

Journal of Thyroid Disorders & Therapy

Author(s): Biscolla RP, Cerutti JM, Maciel RM

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Abstract To investigate whether circulating thyroglobulin (Tg) messenger ribonucleic acid (mRNA) and sodium/iodide symporter (NIS) mRNA transcripts in peripheral blood are valuable in the follow-up of patients with thyroid cancer, we developed highly sensitive nested Tg and NIS mRNA detection assays and compared their accuracy with serum thyroglobulin (sTg) and whole body scan with 131I during the monitoring of 34 patients with well differentiated thyroid carcinoma who had undergone total thyroidectomy (17 of 34 also submitted to thyroid ablation with radioiodine) and were taking T4. Circulating Tg mRNA was found in 13 of 34 patients, 5 of 13 with detectable and 8 of 13 with undetectable sTg. From these 8 patients with undetectable Tg, 6 showed no cervical radioiodine uptake, and 3 presented proven metastatic disease (2 of them positive for antithyroglobulin antibodies). NIS mRNA was detected in 11 of 34 patients, but its measurement did not improve the ability to detect patients with metastases. Overall, identification of metastatic thyroid cancer was better associated with Tg mRNA than with NIS mRNA, sTg, or whole body scan (83\% vs. 16.6\% vs. 50\% vs. 50\%; P < 0.001). These data showed that circulating Tg mRNA is not only a more sensitive marker of residual thyroid tissue or thyroid cancer than sTg, particularly in patients during T4 therapy and with positive antithyroglobulin antibodies, but also was more sensitive than NIS mRNA in all patients. This article was published in J Clin Endocrinol Metab and referenced in Journal of Thyroid Disorders & Therapy

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