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Thyroglobulin before ablation and correlation with posttreatment scanning
Pedro Weslley Souza de Rosário1, Valéria C Guimarães, Frederico Fernandes Ribeiro Maia
1Department of Thyroid, Santa Casa de Belo Horizonte, Minas Gerais, Brazil. pedrorosario@globo.com
The Laryngoscope
|February 4, 2005
Summary
Thyroglobulin (Tg) levels after thyroid cancer treatment help predict metastasis. A Tg level below 10 ng/mL rarely indicates distant spread, guiding further imaging and therapy decisions.
Area of Science:
- Endocrinology
- Oncology
- Nuclear Medicine
Background:
- Thyroid carcinoma management involves monitoring thyroglobulin (Tg) levels post-treatment.
- Assessing the utility of Tg levels before ablation is crucial for patient management.
Purpose of the Study:
- To evaluate the effectiveness of thyroglobulin (Tg) measurements before radioactive iodine ablation.
- To correlate preoperative Tg levels with posttreatment scanning results in thyroid cancer patients.
Main Methods:
- Prospective study involving 212 patients with thyroid carcinoma.
- Thyroglobulin (Tg) levels measured during hypothyroidism before ablation.
- Disease staging based on clinical exams, Tg, posttherapy scans, imaging, and histology.
Main Results:
- Distant metastases were found in 17% of patients, lymph node metastases in 31%.
- Posttreatment scanning sensitivity was 71% for lymph nodes and 94.1% for distant metastases.
- Ectopic uptake on scanning increased with Tg levels, reaching 51% for Tg > 10 ng/mL.
Conclusions:
- A postoperative thyroglobulin (Tg) level < 10 ng/mL rarely indicates distant metastases.
- Tg levels > 10 ng/mL correlate with a higher incidence of metastases, suggesting its use for guiding imaging and radioiodine therapy.
- Neck ultrasound remains essential for detecting lymph node metastases, even with undetectable Tg.