Endocrinology and Metabolism

Original Articles

Clinical Study
Triiodothyronine Levels Are Independently Associated with Metabolic Syndrome in Euthyroid Middle-Aged Subjects: Hye Jeong Kim, Ji Cheol Bae, Hyeong Kyu Park, Dong Won Byun, Kyoil Suh, Myung Hi Yoo, Jae Hyeon Kim, Yong-Ki Min, Sun Wook Kim, Jae Hoon Chung; Endocrinol Metab. 2016;31(2):311-319. Published online May 13, 2016; DOI: https://doi.org/10.3803/EnM.2016.31.2.311

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Background

Recent studies have shown an association between thyroid hormone levels and metabolic syndrome (MetS) among euthyroid individuals; however, there have been some inconsistencies between studies. Here, we evaluated the relationship between thyroid hormone levels and MetS in euthyroid middle-aged subjects in a large cohort.

Methods

A retrospective analysis of 13,496 euthyroid middle-aged subjects who participated in comprehensive health examinations was performed. Subjects were grouped according to thyroid stimulating hormone, total triiodothyronine (T3), total thyroxine (T4), and T3-to-T4 ratio quartile categories. We estimated the odds ratios (ORs) for MetS according to thyroid hormone quartiles using logistic regression models, adjusted for potential confounders.

Results

Of the study patients, 12% (n=1,664) had MetS. A higher T3 level and T3-to-T4 ratio were associated with unfavourable metabolic profiles, such as higher body mass index, systolic and diastolic blood pressure, triglycerides, fasting glucose and glycated hemoglobin, and lower high density lipoprotein cholesterol levels. The proportion of participants with MetS increased across the T3 quartile categories (P for trend <0.001) and the T3-to-T4 ratio quartile categories (P for trend <0.001). The multi-variate-adjusted OR (95% confidence interval) for MetS in the highest T3 quartile group was 1.249 (1.020 to 1.529) compared to the lowest T3 quartile group, and that in the highest T3-to-T4 ratio quartile group was 1.458 (1.141 to 1.863) compared to the lowest T3-to-T4 ratio quartile group, even after adjustment for potential confounders.

Conclusion

Serum T3 levels and T3-to-T4 ratio are independently associated with MetS in euthyroid middle-aged subjects. Longitudinal studies are needed to define this association and its potential health implications.

Citations

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Thyroid
The Validity of Ultrasonography-Guided Fine Needle Aspiration Biopsy in Thyroid Nodules 4 cm or Larger Depends on Ultrasonography Characteristics: Jin Hwa Kim, Na Kyung Kim, Young Lyun Oh, Hye Jeong Kim, Sang Yong Kim, Jae Hoon Chung, Sun Wook Kim; Endocrinol Metab. 2014;29(4):545-552. Published online December 29, 2014; DOI: https://doi.org/10.3803/EnM.2014.29.4.545

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Background

The objective of this study was to evaluate the validity of fine needle aspiration biopsy (FNAB) according to ultrasonography (US) characteristics in thyroid nodules 4 cm and larger.

Methods

We retrospectively reviewed the cases of 263 patients who underwent thyroid surgery for thyroid nodules larger than 4 cm between January 2001 and December 2010.

Results

The sensitivity of US-FNAB was significantly higher in nodules with calcifications (micro- or macro-) than those without (97.9% vs. 87.% P<0.05). The accuracy of US-FNAB was higher in large thyroid nodules with US features suspicious of malignancy, such as a solid component, ill-defined margin, hypoechogenicity or marked hypoechogenicity, or any calcifications (micro- or macro-) compared to thyroid nodules with none of these features. Furthermore, the accuracy improved as the number of these features increased. The overall false negative rate (FNR) was 11.9%. The FNR of thyroid nodules that appeared benign on US, such as mixed nodules (7.7%) or nodules without calcification (9.8%), trended toward being lower than that of solid nodules (17.9%) or nodules with any microcalcification or macrocalcification (33.3%). In nodules without suspicious features of malignancy, the FNR of US-FNAB was 0% (0/15).

Conclusion

We suggest individualized strategies for large thyroid nodules according to US features. Patients with benign FNAB can be followed in the absence of any malignant features in US. However, if patients exhibit any suspicious features, potential false negative results of FNAB should be kept in mind and surgery may be considered.

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Frequency of RAS Mutations and PAX8/PPARgamma Rearrangement in Follicular Thyroid Tumors in Korea.: Hye Jeong Kim, Hye Won Jang, Seo Young Sohn, Yoon La Choi, Hee Jin Kim, Young Lyun Oh, Sun Wook Kim, Jae Hoon Chung; Endocrinol Metab. 2012;27(1):45-53. Published online March 1, 2012; DOI: https://doi.org/10.3803/EnM.2012.27.1.45

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Abstract PDF

BACKGROUND
Follicular thyroid tumors harbor several genetic alterations such as RAS mutations and PAX8/PPARgamma rearrangement. The aims of our study were to investigate the prevalence of RAS mutations and PAX8/PPARgamma rearrangement in follicular thyroid tumors and to correlate RAS mutations and/or PAX8/PPARgamma rearrangement with clinicopathologic features in Korean patients with follicular thyroid carcinomas. METHODS: RAS mutations were investigated by polymerase chain reaction and DNA sequencing in surgical specimens of 37 follicular thyroid carcinomas (FTCs) and 16 follicular thyroid adenomas (FTAs). PAX8/PPARgamma rearrangement was analyzed by fluorescent in situ hybridization in surgical specimens of 31 FTCs and 13 FTAs. RESULTS: RAS mutations were detected in 30% (11 of 37) of FTCs and 19% (three of 16) of FTAs. Three of 11 FTC patients with RAS mutations died of thyroid cancer, but none of the 26 FTC patients without RAS mutations. PAX8/PPARgamma rearrangement was found in 10% (three of 31) of FTCs, but in none of the 13 FTAs. All three FTC patients with PAX8/PPARgamma rearrangement remained in complete remission during follow-up. There were no FTC patients with both RAS mutations and PAX8/PPARgamma rearrangement. CONCLUSION: The prevalence of RAS mutations in our series of follicular tumors was similar to previous studies. The frequency of PAX8/PPARgamma rearrangements in our group of FTC was lower than previous western reports, but higher than Japanese reports. RAS mutations may be associated with hematogeneous metastasis and poor survival while PAX8/PPARgamma rearrangement may be related to more favorable prognosis in Korean patients with FTCs.

Citations

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Preoperative serum thyroglobulin and changes in serum thyroglobulin during TSH suppression independently predict follicular thyroid carcinoma in thyroid nodules with a cytological diagnosis of follicular lesion
Hye Jeong Kim, Ji-Oh Mok, Chul Hee Kim, Yeo Joo Kim, Sang Jin Kim, Hyeong Kyu Park, Dong Won Byun, Kyoil Suh, Myung Hi Yoo
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