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Thyroid hormone-producing metastases in differentiated thyroid cancer
1Endocrine Division and Nuclear Unit, Hospital de Clinicas de Porto Alegre, RS, Brazil.
Journal of Endocrinological Investigation
|January 1, 1996
Summary
Thyroid hormone-producing metastases from differentiated thyroid cancer are rare. This study suggests a link between these hormone-producing metastases and environmental factors like iodine deficiency, particularly in follicular thyroid carcinoma.
Area of Science:
- Endocrinology
- Oncology
- Epidemiology
Background:
- Thyroid hormone production by differentiated thyroid carcinoma metastases is a rare phenomenon with an unknown pathogenesis.
- Environmental factors, specifically iodine deficiency, are hypothesized to play a role.
Purpose of the Study:
- To investigate clinical and demographic evidence linking thyroid hormone-producing metastases of differentiated thyroid carcinoma to environmental factors, particularly iodine deficiency.
Main Methods:
- A cross-sectional study of 125 differentiated thyroid carcinoma patients with distant metastases.
- Serum hormone levels (T3, T4, thyroglobulin, TSH) and 131I whole-body scintigraphy were analyzed.
- Patients were categorized into hormone-producing (6) and non-producing (29) metastases groups.
Main Results:
- All hormone-producing metastases were associated with pure follicular thyroid carcinoma.
- Patients with hormone-producing metastases had a higher prevalence of long-standing goiter (p < 0.01) and came from iodine-deficient areas (p < 0.05).
- Serum thyroglobulin levels tended to be higher in the hormone-producing group (p = 0.069).
Conclusions:
- Late diagnosis of follicular thyroid carcinoma in patients with long-standing multinodular goiter may lead to well-differentiated, bulky metastases capable of hormone production.
- Iodine deficiency is a potential contributing environmental factor.