Journal of Korean Endocrine Society 2004;19(2):165-174.
Published online April 1, 2004.
Relationship between The Expressions of Sodium/Iodide Symporter and The Findings of Thallium-201 Scan in Thyroid Nodules.
Joon Hyop An, Min Ah Na, Sang Soo Kim, Ok Nyu Kong, Ju Won Seok, Chang Hun Lee, Chang Won Lee, In Joo Kim, Yong Ki Kim
1Department of Internal Medicine, College of Medicine, Pusan National University, Korea.
2Department of Nuclear Medicine, College of Medicine, Pusan National University, Korea.
3Department of Pathology, College of Medicine, Pusan National University, Korea.
4Department of Internal Medicine, College of Medicine, Konyang University, Korea.
Abstract
BACKGROUND
The sodium/iodide symporter (NIS) has an important role in the diagnosis and treatment of well differentiated thyroid carcinoma. The relationship between the uptake of thallium- 201 scan (201Tl scan) and the expression of sodium/iodide symporter (hNIS) was studied in thyroid nodules. METHODS: Patients that had undergone operations for thyroid nodules, and who received a 201Tl scan before their operations, were investigated. Anti-NIS antibodies were used to analyze the presence and distribution of the hNIS protein by immunohistochemical staining of their thyroid tissues. RESULTS: Forty-four patients (papillary carcinoma; 18, follicular adenoma; 11, adenomatous goiter; 14, nonspecific thyroiditis; 1) 30 with no immunoreactivity and 14 with a positive reaction to the anti-NIS antibody, were included. The NIS negative patients (12/30) had no 201Tl uptake, but all others were positive on 201Tl scan, and the NIS-positive patients (13/14) had positive 201Tl uptake, with 1 negative on 201Tl scan, with significant difference (p=0.035). Of the 18 patients with a papillary thyroid carcinoma, the NIS negative patients (2/10) had no 201Tl uptake and the others were positive on 201Tl scan, but without significant difference. NIS positive patients (1/8) with a papillary thyroid carcinoma had no 201Tl uptake, and the others were positive on 201Tl scan, but without significant difference. Whether the results of NIS staining and 201Tl scan were positive or not did not affect the responses of radioactive iodine therapy in our study. CONCLUSION: These results suggest that thallium-201 uptake may be correlated with hNIS expression in thyroid nodules
Key Words: Sodium/iodide symporter, Thallium-201 scan, Thyroid nodule, Immunohistochemistry


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