Endocrinology and Metabolism

Original Article

Thyroid Big Data Articles (National Health Insurance Service Database)
Prevalence, Treatment Status, and Comorbidities of Hyperthyroidism in Korea from 2003 to 2018: A Nationwide Population Study: Hwa Young Ahn, Sun Wook Cho, Mi Young Lee, Young Joo Park, Bon Seok Koo, Hang-Seok Chang, Ka Hee Yi; Endocrinol Metab. 2023;38(4):436-444. Published online July 12, 2023; DOI: https://doi.org/10.3803/EnM.2023.1684

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Background
This study aimed to investigate the changes of incidence and treatment of choice for hyperthyroidism from 2003 to 2018 and explore the treatment-related complications and concomitant comorbidities in South Korea using data from the National Health Insurance Service.
Methods
This is a retrospective observational study. Hyperthyroidism was defined as a case having two or more diagnostic codes of thyrotoxicosis, with antithyroid drug intake for more than 6 months.
Results
The average age-standardized incidence of hyperthyroidism from 2003 to 2018 was 42.23 and 105.13 per 100,000 men and women, respectively. In 2003 to 2004, hyperthyroidism was most often diagnosed in patients in their 50s, but in 2017 to 2018, people were most often diagnosed in their 60s. During the entire period, about 93.7% of hyperthyroidism patients were prescribed with antithyroid drugs, and meanwhile, the annual rates of ablation therapy decrease from 7.68% in 2008 to 4.56% in 2018. Antithyroid drug-related adverse events, mainly agranulocytosis and acute hepatitis, as well as complications of hyperthyroidism such as atrial fibrillation or flutter, osteoporosis, and fractures, occurred more often in younger patients.
Conclusion
In Korea, hyperthyroidism occurred about 2.5 times more in women than in men, and antithyroid drugs were most preferred as the first-line treatment. Compared to the general population, hyperthyroid patients may have a higher risk of atrial fibrillation or flutter, osteoporosis, and fractures at a younger age.

Citations

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Long-term effect of thyrotropin-binding inhibitor immunoglobulin on atrial fibrillation in euthyroid patients
Jung-Chi Hsu, Kang-Chih Fan, Ting-Chuan Wang, Shu-Lin Chuang, Ying-Ting Chao, Ting-Tse Lin, Kuan-Chih Huang, Lian-Yu Lin, Lung-Chun Lin
Endocrine Practice.2024;[Epub] CrossRef
The Current Status of Hyperthyroidism in Korea
Hyemi Kwon
Endocrinology and Metabolism.2023; 38(4): 392. CrossRef
Is Thyroid Dysfunction Associated with Unruptured Intracranial Aneurysms? A Population-Based, Nested Case–Control Study from Korea
Hyeree Park, Sun Wook Cho, Sung Ho Lee, Kangmin Kim, Hyun-Seung Kang, Jeong Eun Kim, Aesun Shin, Won-Sang Cho
Thyroid®.2023; 33(12): 1483. CrossRef

Review Article

Thyroid
Diagnosis and Management of Thyroid Disease during Pregnancy and Postpartum: 2023 Revised Korean Thyroid Association Guidelines: Hwa Young Ahn, Ka Hee Yi; Endocrinol Metab. 2023;38(3):289-294. Published online June 9, 2023; DOI: https://doi.org/10.3803/EnM.2023.1696

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Thyroid hormone plays a critical role in fetal growth and development, and thyroid dysfunction during pregnancy is associated with several adverse outcomes, such as miscarriage and preterm birth. In this review, we introduce and explain three major changes in the revised Korean Thyroid Association (KTA) guidelines for the diagnosis and management of thyroid disease during pregnancy: first, the normal range of thyroid-stimulating hormone (TSH) during pregnancy; second, the treatment of subclinical hypothyroidism; and third, the management of euthyroid pregnant women with positive thyroid autoantibodies. The revised KTA guidelines adopt 4.0 mIU/L as the upper limit of TSH in the first trimester. A TSH level between 4.0 and 10.0 mIU/L, combined with free thyroxine (T4) within the normal range, is defined as subclinical hypothyroidism, and a TSH level over 10 mIU/L is defined as overt hypothyroidism regardless of the free T4 level. Levothyroxine treatment is recommended when the TSH level is higher than 4 mIU/L in subclinical hypothyroidism, regardless of thyroid peroxidase antibody positivity. However, thyroid hormone therapy to prevent miscarriage is not recommended in thyroid autoantibody-positive women with normal thyroid function.

Citations

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Use of thyroid hormones in hypothyroid and euthyroid patients: A survey of members of the Endocrine Society of Australia
Nicole Lafontaine, Suzanne J. Brown, Petros Perros, Enrico Papini, Endre V. Nagy, Roberto Attanasio, Laszlo Hegedüs, John P. Walsh
Clinical Endocrinology.2024; 100(5): 477. CrossRef
Management of Subclinical Hypothyroidism: A Focus on Proven Health Effects in the 2023 Korean Thyroid Association Guidelines
Eu Jeong Ku, Won Sang Yoo, Hyun Kyung Chung
Endocrinology and Metabolism.2023; 38(4): 381. CrossRef
Maternal isolated hypothyroxinemia in the first trimester is not associated with adverse pregnancy outcomes, except for macrosomia: a prospective cohort study in China
Jing Du, Linong Ji, Xiaomei Zhang, Ning Yuan, Jianbin Sun, Dan Zhao
Frontiers in Endocrinology.2023;[Epub] CrossRef

Editorial

Thyroid Thyroid Cancer Screening
The 2017 United States Preventive Services Task Force Recommendation for Thyroid Cancer Screening Is No Longer the Gold Standard: Ka Hee Yi; Endocrinol Metab. 2023;38(1):72-74. Published online February 27, 2023; DOI: https://doi.org/10.3803/EnM.2023.106

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Original Articles

Thyroid
Clinicopathological Characteristics and Recurrence-Free Survival of Rare Variants of Papillary Thyroid Carcinomas in Korea: A Retrospective Study: Mijin Kim, Sun Wook Cho, Young Joo Park, Hwa Young Ahn, Hee Sung Kim, Yong Joon Suh, Dughyun Choi, Bu Kyung Kim, Go Eun Yang, Il-Seok Park, Ka Hee Yi, Chan Kwon Jung, Bo Hyun Kim; Endocrinol Metab. 2021;36(3):619-627. Published online June 10, 2021; DOI: https://doi.org/10.3803/EnM.2021.974

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Background
We aimed to evaluate the clinicopathological features and biological behaviors of Korean thyroid cancer patients with rare variants of papillary thyroid carcinoma (PTC) to address the ambiguity regarding the prognostic consequences of these variants.
Methods
We retrospectively reviewed the medical records of 5,496 patients who underwent thyroid surgery for PTC, between January and December 2012, in nine tertiary hospitals. Rare PTC variants included tall cell (TCV), columnar cell (CCV), diffuse sclerosing (DSV), cribriform-morular (CMV), solid (SV), hobnail, and Warthin-like variants. Recurrence-free survival (RFS) was defined as the time from the date of thyroidectomy until recurrence.
Results
Rare variants accounted for 1.1% (n=63) of the PTC patients; with 0.9% TCV, 0.02% CCV, 0.1% DSV, 0.1% CMV, and 0.1% SV. The mean age of patients and primary tumor size were 42.1±13.1 years and 1.3±0.9 cm, respectively. Extrathyroidal extension and cervical lymph node metastasis were observed in 38 (60.3%) and 37 (58.7%) patients, respectively. Ultrasonographic findings revealed typical malignant features in most cases. During a median follow-up of 7 years, 6.3% of patients experienced a locoregional recurrence. The 5-year RFS rates were 71.4% in patients with DSV or SV, 95.9% for TCV, or CCV, and 100% for other variants. DSV emerged an independent risk factor associated with shorter RFS.
Conclusion
In this multicenter Korean cohort, rare variants accounted for 1.1% of all PTC cases, with TCV being the most frequent subtype. DSV emerged as a significant prognostic factor for RFS.

Citations

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Serum thyroglobulin testing after thyroid lobectomy in patients with 1–4 cm papillary thyroid carcinoma
Ahreum Jang, Meihua Jin, Chae A Kim, Min Ji Jeon, Yu-Mi Lee, Tae-Yon Sung, Tae Yong Kim, Won Bae Kim, Young Kee Shong, Won Gu Kim
Endocrine.2023; 81(2): 290. CrossRef
Do Histologically Aggressive Subtypes of Papillary Thyroid Microcarcinoma have Worse Clinical Outcome than Non-Aggressive Papillary Thyroid Microcarcinoma Subtypes? A Multicenter Cohort Study
Sayid Shafi Zuhur, Hunkar Aggul, Ugur Avci, Selvinaz Erol, Mazhar Müslüm Tuna, Serhat Uysal, Gulhan Akbaba, Faruk Kilinç, Merve Catak, Sakin Tekin, Ogun Irem Bilen, Beyza Olcay Öztürk, Ecem Bilgehan Erden, Gulsah Elbuken, Halise Cinar Yavuz, Pinar Kadiogl
Hormone and Metabolic Research.2023; 55(05): 323. CrossRef
The Warthin-like variant of papillary thyroid carcinomas: a clinicopathologic analysis report of two cases
Xing Zhao, Yijia Zhang, Pengyu Hao, Mingzhen Zhao, Xingbin Shen
Oncologie.2023; 25(5): 581. CrossRef
A Retrospective Cohort Study with Validation of Predictors of Differentiated Thyroid Cancer Outcomes
Ayanthi Wijewardene, Anthony J. Gill, Matti Gild, Diana L. Learoyd, Anthony Robert Glover, Mark Sywak, Stan Sidhu, Paul Roach, Geoffrey Schembri, Jeremy Hoang, Bruce Robinson, Lyndal Tacon, Roderick Clifton-Bligh
Thyroid.2022;[Epub] CrossRef
Clinicopathological Implications of the BRAFV600E Mutation in Papillary Thyroid Carcinoma of Ukrainian Patients Exposed to the Chernobyl Radiation in Childhood: A Study for 30 Years After the Accident
Liudmyla Zurnadzhy, Tetiana Bogdanova, Tatiana I. Rogounovitch, Masahiro Ito, Mykola Tronko, Shunichi Yamashita, Norisato Mitsutake, Michael Bolgov, Serhii Chernyshov, Sergii Masiuk, Vladimir A. Saenko
Frontiers in Medicine.2022;[Epub] CrossRef

Thyroid
Effect of Cigarette Smoking on Thyroid Cancer: Meta-Analysis: Joon-Hyop Lee, Young Jun Chai, Ka Hee Yi; Endocrinol Metab. 2021;36(3):590-598. Published online May 26, 2021; DOI: https://doi.org/10.3803/EnM.2021.954

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Background
Although smoking is generally carcinogenic, its effect on thyroid cancers is still subject to controversy. The purpose of this study was to summarize the role of smoking in relation to thyroid cancer occurrence.
Methods
We performed a meta-analysis of 24 eligible studies: 21 case-control studies and three prospective cohort studies. The summary odds ratio (OR) and 95% confidence interval (CI) of all studies were acquired based on random effect model. Further subgroup analyses were conducted according to gender, histological type of thyroid cancer, and smoking status of patients for the case-control studies.
Results
The summary effect size indicated a negative association of smoking for thyroid cancer (OR, 0.798; 95% CI, 0.681 to 0.935). From the subgroup analyses for the case-control studies, reduced risk of thyroid cancer was observed in both men (OR, 0.734; 95% CI, 0.553 to 0.974) and women (OR, 0.792; 95% CI, 0.700 to 0.897). The protective effect of smoking was observed in studies in which thyroid cancer was limited to differentiated thyroid cancers (DTCs) (OR, 0.798; 95% CI, 0.706 to 0.902).
Conclusion
Our results suggests that smoking may have a protective effect on thyroid cancer, especially on DTCs. Further studies with larger sample sizes should be conducted in elucidating the dose and time dependent effect of smoking on thyroid cancer with specific focus on the types of thyroid cancers.

Citations

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Yifei Liu, Suzhen Guan, Haiming Xu, Na Zhang, Min Huang, Zhihong Liu
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Maternal gestational weight gain and offspring’s neurodevelopmental outcomes: A systematic review and meta-analysis
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Neuroscience & Biobehavioral Reviews.2023; 153: 105360. CrossRef
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Cigarette smoking and thyroid cancer risk: A Mendelian randomization study
Hongzhan Jiang, Yi Li, Jiali Shen, Huihui Lin, Siyue Fan, Rongliang Qiu, Jiaxi He, Ende Lin, Lijuan Chen
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Longitudinal Changes in Smoking Habits in Women and Subsequent Risk of Cancer
Thi Xuan Mai Tran, Soyeoun Kim, Huiyeon Song, Boyoung Park
American Journal of Preventive Medicine.2022; 63(6): 894. CrossRef

Thyroid
A Multicenter, Randomized, Controlled Trial for Assessing the Usefulness of Suppressing Thyroid Stimulating Hormone Target Levels after Thyroid Lobectomy in Low to Intermediate Risk Thyroid Cancer Patients (MASTER): A Study Protocol: Eun Kyung Lee, Yea Eun Kang, Young Joo Park, Bon Seok Koo, Ki-Wook Chung, Eu Jeong Ku, Ho-Ryun Won, Won Sang Yoo, Eonju Jeon, Se Hyun Paek, Yong Sang Lee, Dong Mee Lim, Yong Joon Suh, Ha Kyoung Park, Hyo-Jeong Kim, Bo Hyun Kim, Mijin Kim, Sun Wook Kim, Ka Hee Yi, Sue K. Park, Eun-Jae Jung, June Young Choi, Ja Seong Bae, Joon Hwa Hong, Kee-Hyun Nam, Young Ki Lee, Hyeong Won Yu, Sujeong Go, Young Mi Kang, MASTER study group; Endocrinol Metab. 2021;36(3):574-581. Published online May 26, 2021; DOI: https://doi.org/10.3803/EnM.2020.943

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Background
Postoperative thyroid stimulating hormone (TSH) suppression therapy is recommended for patients with intermediate- and high-risk differentiated thyroid cancer to prevent the recurrence of thyroid cancer. With the recent increase in small thyroid cancer cases, the extent of resection during surgery has generally decreased. Therefore, questions have been raised about the efficacy and long-term side effects of TSH suppression therapy in patients who have undergone a lobectomy.
Methods
This is a multicenter, prospective, randomized, controlled clinical trial in which 2,986 patients with papillary thyroid cancer are randomized into a high-TSH group (intervention) and a low-TSH group (control) after having undergone a lobectomy. The principle of treatment includes a TSH-lowering regimen aimed at TSH levels between 0.3 and 1.99 μIU/mL in the low-TSH group. The high-TSH group targets TSH levels between 2.0 and 7.99 μIU/mL. The dose of levothyroxine will be adjusted at each visit to maintain the target TSH level. The primary outcome is recurrence-free survival, as assessed by neck ultrasound every 6 to 12 months. Secondary endpoints include disease-free survival, overall survival, success rate in reaching the TSH target range, the proportion of patients with major cardiovascular diseases or bone metabolic disease, the quality of life, and medical costs. The follow-up period is 5 years.
Conclusion
The results of this trial will contribute to establishing the optimal indication for TSH suppression therapy in low-risk papillary thyroid cancer patients by evaluating the benefit and harm of lowering TSH levels in terms of recurrence, metabolic complications, costs, and quality of life.

Citations

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Effect of thyroid-stimulating hormone suppression on quality of life in thyroid lobectomy patients: interim analysis of a multicenter, randomized controlled trial in low- to intermediate-risk thyroid cancer patients (MASTER study)
Ja Kyung Lee, Eu Jeong Ku, Su-jin Kim, Woochul Kim, Jae Won Cho, Kyong Yeun Jung, Hyeong Won Yu, Yea Eun Kang, Mijin Kim, Hee Kyung Kim, Junsun Ryu, June Young Choi
Annals of Surgical Treatment and Research.2024; 106(1): 19. CrossRef
Clinical impact of coexistent chronic lymphocytic thyroiditis on central lymph node metastasis in low- to intermediate-risk papillary thyroid carcinoma: The MASTER study
Da Beom Heo, Ho-Ryun Won, Kyung Tae, Yea Eun Kang, Eonju Jeon, Yong Bae Ji, Jae Won Chang, June Young Choi, Hyeong Won Yu, Eu Jeong Ku, Eun Kyung Lee, Mijin Kim, Jun-Ho Choe, Bon Seok Koo
Surgery.2024; 175(4): 1049. CrossRef
Dynamic Changes in Treatment Response af-ter ¹³¹I in Differentiated Thyroid Cancer and Their Relationship with Recurrence Risk Stratification and TNM Staging
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Advances in Clinical Medicine.2024; 14(03): 1083. CrossRef
ASO Author Reflections: Active Surveillance may be Possible in Patients with T1b Papillary Thyroid Carcinoma Over 55 Years of Age Without High-Risk Features on Preoperative Examinations
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Current Controversies in Low-Risk Differentiated Thyroid Cancer: Reducing Overtreatment in an Era of Overdiagnosis
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Age-Dependent Clinicopathological Characteristics of Patients with T1b Papillary Thyroid Carcinoma: Implications for the Possibility of Active Surveillance
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Annals of Surgical Oncology.2023; 30(4): 2246. CrossRef
Potential impact of obesity on the aggressiveness of low- to intermediate-risk papillary thyroid carcinoma: results from a MASTER cohort study
Mijin Kim, Yae Eun Kang, Young Joo Park, Bon Seok Koo, Eu Jeong Ku, June Young Choi, Eun Kyung Lee, Bo Hyun Kim
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Differentiated thyroid cancer: a focus on post-operative thyroid hormone replacement and thyrotropin suppression therapy
Benjamin J. Gigliotti, Sina Jasim
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Thyroid stimulating hormone suppression and recurrence after thyroid lobectomy for papillary thyroid carcinoma
Mi Rye Bae, Sung Hoon Nam, Jong-Lyel Roh, Seung-Ho Choi, Soon Yuhl Nam, Sang Yoon Kim
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Clinical Study
A Phase II Multi-Center, Non-Randomized, Parallel Group, Non-Inferiority Study to Compare the Efficacy of No Radioactive Iodine Remnant Ablation to Remnant Ablation Treatment in Low- to Intermediate-Risk of Papillary Thyroid Cancer: The MOREthyroid Trial Protocol: Eun Kyung Lee, You Jin Lee, Young Joo Park, Jae Hoon Moon, Ka Hee Yi, Koon Soon Kim, Joo Hee Lee, Sun Wook Cho, Jungnam Joo, Yul Hwangbo, Sujeong Go, Do Joon Park; Endocrinol Metab. 2020;35(3):571-577. Published online September 22, 2020; DOI: https://doi.org/10.3803/EnM.2020.681

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Abstract PDF Supplementary Material PubReader ePub: Background
Radioactive iodine (RAI) remnant ablation is recommended in patients with papillary thyroid cancer (PTC) and extrathyroidal extension or central lymph node metastasis. However, there exists little evidence about the necessity of remnant ablation in PTC patients with low- to intermediate-risk, those have been increasing in recent decades.
Methods
This multicenter, prospective, non-randomized, parallel group clinical trial will enroll 310 eligible patients with low- to intermediate-risk of thyroid cancer. Inclusion criteria are patients who recently underwent total thyroidectomy for PTC with 3 or less tumors of size 1≤ to ≤2 cm with no microscopic extension and N0/x, or size ≤2 cm with microscopic extension and/or N1a (number of lymph node ≤3, size of tumor foci ≤0.2 cm, and lymph node ratio <0.4). Patients choose to undergo RAI ablation (¹³¹I, dose 1.1 GBq) or diagnostic whole-body scan (DxWBS) (¹³¹I or ¹²³I, dose 0.074 to 0.222 GBq), followed by subsequent measurement of stimulated thyroglobulin (sTg) within 1 year. Survey for quality of life (QOL) will be performed at baseline and at 1 year after follow-up. The total enrollment period is 5 years, and patients will be followed up for 1 year. The primary endpoint is the non-inferiority of surgery alone to surgery with ablation in terms of biochemical remission (BCR) rate (sTg ≤2 ng/mL) without evidence of structural recurrence. The secondary endpoint was the difference of QOL.
Conclusion
This study will evaluate whether surgery alone achieves similar BCR and improved QOL compared to RAI ablation in patients with low- to intermediate-risk PTC within 1 year.

Assay of Thyrotropin Receptor Antibodies with Recombinant Human Thyrotropin Receptor Expressed on Chinese Hamster Ovary Cells.: Bo Youn Cho, Hong Kyu Lee, Chang Soon Koh, Jae Hoon Chung, Ka Hee Yi, Kyung Soo Ko, Won Bae Kim; J Korean Endocr Soc. 1995;10(4):347-361. Published online November 7, 2019

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Abstract PDF: Thyroid stimulating antibody which results in the development of hyperthyroidism and goiter in Graves' patients used to be measured by using rat thyroid cells, FRTL-5. However, this assay has disadvantages: decreased sensitivity due to differences in species, and fastidious culture conditions for FRTL-5 cells. Thus, we recently created stably transfected Chinese hamster ovary(CHO) cells containing the human TSH receptor(hTSHR-CHO) and developed optimal conditions for the measurement of thyroid stimulating antibody using hTSHR-CHO cells. In this study, to evaluate the clinical relevance of thyroid stimulating antibody measurement using hTSHR-CHO cells, we measured thyroid stimulating antibody activities of IgGs from Graves' disease and other thyroid disease using hTSHR-CHO cells, and compared to those of thyroid stimulating antibody assays using FRTL-5 cells. 1) The cut off value of positive thyroid stimulating antibody activity measured in hTSHR-CHO cells was 145%(above the mean +2SD) which was lower than 165% in FRTL-5 cells. The intra-assay and inter-assay variances were 3.9% to 9.0% and 12.7% to 1.6%, respectively. 2) Thyroid stimulating antibody activity was detected in 90% of patients with untreated Graves' disease when patients initially presented. Further, in patients seen initially but already under therapy, 75% had positive values if they were hyperthyroid but only 43% had IgGs with activity if they were euthyroid. Patients in clinical remission after therapy showed positive values in 23% of cases. Only 2 of 25 patients with Hashimoto's thyroiditis showed weak thyroid stimulating antibody activity, none of 18 patients with nodular nontoxie goiter, 1 of 15 patients with primary myxedema, and 2 of 33 control patients with no thyroid disease. Thus, the detection frequency and specificity of the assay with hTSHR-CHO cells was excellent for this type bioassay.3) The detection frequency of thyroid stimulating antibody activity by hTSHR-CHO cells assay system(90%) was higher than that by FRTL-5 cells assay system(66%) in untreated Graves' patients. Those two activities were positively correlated with each other(r=0.52, p<0.001). However, some IgGs showed discrepancy of the thyroid stimulating antibody activity measured in hTSHR-CHO cells and in FRTL-5 cells; 56 of 87 patients were positive in both cells system, 8 of 87 were negative in both cells system, 1 of 87 was only positive in FRTL-5 cells and 22 of 87 were only positive in hTSHR-CHO cell system. Thus, 73%(22/30) of IgGs showing negative values of thyroid stimulating antibody activities in FRTL-5 cells were detected its activities in hTSHR-CHO cells system.In summary, thyroid stimulating antibody assay with hTSHR-CHO cells exhibited so excellent sensitivity and specificity that this technique should be used for clinical practice as well as basic research.

Thyroid Stimulating Antibody Assay with Chinese Hamster Ovary Cells Expressing Human Thyroid Stimulating Hormone (TSH) Receptor; Optimization of Assay Condition.: Bo Youn Cho, Hong Kyu Lee, Young Kee Shong, Chang Soon Koh, Ka Hee Yi, Yeon Sahng Oh, Won Bae Kim; J Korean Endocr Soc. 1995;10(4):333-346. Published online November 7, 2019

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Abstract PDF: We investigated the optimal condition of thyroid stimulating antibody(TSAb) assay using Chinese hamster ovary cells transfected with cDNA of human TSH receptor(TSHr-CHO) stably expressing functional TSH receptors. The extracellular cAMP responses of TSHr-CHO cells to the stimulation of bTSH or Graves' IgG were observed in three different incubation media. Stimulation indices of extracellular cAMP were higher when sucrose containing NaCl-free isotonic Hank's balanced salt solution(HBSS)(media A)was used as incubation media than those of NaCl-free hypotonic HBSS(media B) or those of NaCl containing isotonic HBSS(media C). The incubation of TSHr-CHO cells in media B caused marked increase in the basal cAMP level without concomittant fold-increase in the stimulated cAMP level at various doses of bTSH and Graves' IgG. Decreasing the stimulation indices of extracellular cAMP, use of media B failed to detect TSAb activities in two TSAb-positive Graves' IgG tested. In case of media C, extracellular cAMP responses are poor at 0.001 and 0.1U/L of bTSH and at all doses of Graves' IgG tested(0.5, 1, 5g/L). The incubation of TSHr-CHO cells in media B caused significant increase in the number of trypan blue-stained, nonviable cells(5.7+-1.5, 7.6+-1.9 and 8.5+-1.6% at 1, 2 and 3h of incubation, respectively; p<0.01) comparing to those incubated in media A or media C(about 2-3% in both media). Those decrease in the viability of TSHr-CHO cells when incubated in hypotonic incubation media may explain the decrease in the stimulation index of extracellular cAMP with the use of media B in contrast to the case of FRTL-5 cells. TSAb assay of 87 consecutive fresh Graves' patients with TSHr-CHO cells using media A detected TSAb activities in 90%(78 patients) of them, and moreover TSAb activities showed significant positive correlation with the pre-treatment serum T_3 and free T_4 levels of those patients. We conclude that TSAb assay with TSHr-CHO cells is a sensitive and physiologically relevant assay system to measure TSAb activities merely through measurements of extracellular cAMP provided that the cells are incubated in NaCl-free isotonic incubation media.

Case Report

A Case of Addison's Disease due to Tuberculosis.: Ji Young Kim, Ho Choon Jeon, Kyeong Young Kim, Sung Eun Cha, Hyung Seok Choi, In Sohn, Ka Hee Yi; J Korean Endocr Soc. 1994;10(3):306-310. Published online November 6, 2019

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Abstract PDF: We reported a case of Addison's disease due to tuberculosis, which was pathologically confirmed by fine-needle aspiration biopsy. In a 39-year-old man with fatigue, weakness, and generalized cutaneous pigmentation, the diagnosis of Addison's disease was made by the finding of elevated plasma ACTH level and subnormal response to rapid ACTH test. Computed tomographic scan revealed bilateral adrenal mass with heterogenous uptake and peripheral rim enhancement, and calcification. Ultrasoundguided fine-deedle aspiration biopsy of the left adrenal mass disclosed granulomatous inflammation with caseation necrosis. The patient also had active tuberculosis in the right inguinal lymph node.

Corrigendum

Miscellaneous
Corrigendum: Author's Name Correction. Study Protocol of Multicenter Prospective Cohort Study of Active Surveillance on Papillary Thyroid Microcarcinoma (MAeSTro): Jae Hoon Moon, Ji-hoon Kim, Eun Kyung Lee, Kyu Eun Lee, Sung Hye Kong, Yeo Koon Kim, Woo-Jin Jeong, Chang Yoon Lee, Roh-Eul Yoo, Yul Hwangbo, Young Shin Song, Min Joo Kim, Sun Wook Cho, Su-jin Kim, Eun-Jae Chung, June Young Choi, Chang Hwan Ryu, You Jin Lee, Jeong Hun Hah, Yuh-Seog Jung, Junsun Ryu, Yunji Hwang, Sue K. Park, Ho Kyung Sung, Ka Hee Yi, Do Joon Park, Young Joo Park; Endocrinol Metab. 2018;33(3):427. Published online August 14, 2018; DOI: https://doi.org/10.3803/EnM.2018.33.3.427

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Citations

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Invasiveness and Metastatic Aggressiveness in Small Differentiated Thyroid Cancers: Demography of Small Papillary Thyroid Carcinomas in the Swedish Population
Haytham Bayadsi, Martin Bergman, Malin Sund, Joakim Hennings
World Journal of Surgery.2020; 44(2): 461. CrossRef
Clinical and pathologic predictors of lymph node metastasis in papillary thyroid microcarcinomas
Ling Zhao, Xiaoya Sun, Yukun Luo, Fulin Wang, Zhaohui Lyu
Annals of Diagnostic Pathology.2020; 49: 151647. CrossRef

Original Articles

Thyroid
Study Protocol of Multicenter Prospective Cohort Study of Active Surveillance on Papillary Thyroid Microcarcinoma (MAeSTro): Jae Hoon Moon, Ji-hoon Kim, Eun Kyung Lee, Kyu Eun Lee, Sung Hye Kong, Yeo Koon Kim, Woo-jin Jung, Chang Yoon Lee, Roh-Eul Yoo, Yul Hwangbo, Young Shin Song, Min Joo Kim, Sun Wook Cho, Su-jin Kim, Eun Jae Jung, June Young Choi, Chang Hwan Ryu, You Jin Lee, Jeong Hun Hah, Yuh-Seog Jung, Junsun Ryu, Yunji Hwang, Sue K. Park, Ho Kyung Sung, Ka Hee Yi, Do Joon Park, Young Joo Park; Endocrinol Metab. 2018;33(2):278-286. Published online June 21, 2018; DOI: https://doi.org/10.3803/EnM.2018.33.2.278

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Background

The ongoing Multicenter Prospective Cohort Study of Active Surveillance on Papillary Thyroid Microcarcinoma (MAeSTro) aims to observe the natural course of papillary thyroid microcarcinoma (PTMC), develop a protocol for active surveillance (AS), and compare the long-term prognosis, quality of life, and medical costs between the AS and immediate surgery groups.

Methods

This multicenter prospective cohort study of PTMC started in June 2016. The inclusion criteria were suspicious of malignancy or malignancy based on fine needle aspiration or core needle biopsy, age of ≥18 years, and a maximum diameter of ≤1 cm. If there was no major organ involvement, no lymph node/distant metastasis, and no variants with poor prognosis, the patients were explained of the pros and cons of immediate surgery and AS before selecting AS or immediate surgery. Follow-up visits (physical examination, ultrasonography, thyroid function, and questionnaires) are scheduled every 6 months during the first 2 years, and then every 1 year thereafter. Progression was defined as a maximum diameter increase of ≥3, ≥2 mm in two dimensions, suspected organ involvement, or lymph node/distant metastasis.

Results

Among 439 enrolled patients, 290 patients (66.1%) chose AS and 149 patients (33.9%) chose immediate surgery. The median follow-up was 6.7 months (range, 0.2 to 11.9). The immediate surgery group had a larger maximum tumor diameter, compared to the AS group (7.1±1.9 mm vs. 6.6±2.0 mm, respectively; P=0.014).

Conclusion

The results will be useful for developing an appropriate PTMC treatment policy based on its natural course and risk factors for progression.

Citations

Citations to this article as recorded by

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Thyroid
Star-Shaped Intense Uptake of ¹³¹I on Whole Body Scans Can Reflect Good Therapeutic Effects of Low-Dose Radioactive Iodine Treatment of 1.1 GBq: Sung Hye Kong, Jung Ah Lim, Young Shin Song, Shinje Moon, Ye An Kim, Min Joo Kim, Sun Wook Cho, Jae Hoon Moon, Ka Hee Yi, Do Joon Park, Bo Youn Cho, Young Joo Park; Endocrinol Metab. 2018;33(2):228-235. Published online May 4, 2018; DOI: https://doi.org/10.3803/EnM.2018.33.2.228

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Background

After initial radioactive iodine (RAI) treatment in differentiated thyroid cancer patients, we sometimes observe a star-shaped region of intense uptake of ¹³¹I on whole body scans (WBSs), called a ‘star artifact.’ We evaluated the clinical implications of star artifacts on the success rate of remnant ablation and long-term prognosis.

Methods

Total 636 patients who received ¹³¹I dose of 1.1 GBq for the initial RAI therapy and who did not show distant metastasis at the time of diagnosis were retrospectively evaluated. A negative second WBS was used for evaluating the ablation efficacy of the RAI therapy. Among them, 235 patients (36.9%) showed a star artifact on their first WBS.

Results

In patients with first stimulated thyroglobulin (sTg) levels ≤2 ng/mL, patients with star artifacts had a higher rate of negative second WBS compared with those without star artifacts (77.8% vs. 63.9%, P=0.044), and showed significantly higher recurrence-free survival (P=0.043) during the median 8.0 years (range, 1.0 to 10.0) of follow-up. The 5- and 10-year recurrence rates (5YRR, 10YRR) were also significantly lower in patients with star artifacts compared with those without (0% vs. 4.9%, respectively, P=0.006 for 5YRR; 0% vs. 6.4%, respectively, P=0.005 for 10YRR). However, ablation success rate or recurrence-free survival was not different among patients whose first sTg levels >2 ng/mL regardless of star artifacts.

Conclusion

Therefore, star artifacts at initial RAI therapy imply a good ablation efficacy or a favorable long-term prognosis in patients with sTg levels ≤2 ng/mL.

Citations

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Prognostic value of star-shaped intense uptake of 131I in thyroid cancer patients
Liu Xiao, Wen Jie Zhang, Yue Qi Wang, Lin Li
Revista Española de Medicina Nuclear e Imagen Molecular (English Edition).2021; 40(1): 30. CrossRef
Valores pronósticos de la captación en estrella de 131I en pacientes con cáncer diferenciado de tiroides
L. Xiao, W.J. Zhang, Y.Q. Wang, L. Li
Revista Española de Medicina Nuclear e Imagen Molecular.2021; 40(1): 30. CrossRef
Comparison between planar and single-photon computed tomography images for radiation intensity quantification in iodine-131 scintigraphy
Yusuke Iizuka, Tomohiro Katagiri, Minoru Inoue, Kiyonao Nakamura, Takashi Mizowaki
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Review Articles

Thyroid
The Revised 2016 Korean Thyroid Association Guidelines for Thyroid Nodules and Cancers: Differences from the 2015 American Thyroid Association Guidelines: Ka Hee Yi; Endocrinol Metab. 2016;31(3):373-378. Published online September 26, 2016; DOI: https://doi.org/10.3803/EnM.2016.31.3.373

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Increased detection of thyroid nodules using high-resolution ultrasonography has resulted in a world-wide increase in the incidence of differentiated thyroid cancer (DTC). Despite the steep increase in its incidence, the age-standardized mortality rate of thyroid cancer has remained stable, which leads toward a trend of more conservative treatment. The latest American Thyroid Association (ATA) guidelines for thyroid nodules and thyroid cancer revised in 2015 suggested that fine needle aspiration biopsy should be performed for thyroid nodules larger than 1 cm and lobectomy might be sufficient for 1 to 4 cm intrathyroidal DTC. In addition, active surveillance instead of immediate surgical treatment was also recommended as a treatment option for papillary thyroid microcarcinoma based on the results of a few observational studies from Japan. The Korean Thyroid Association (KTA) has organized a task force team to develop revised guidelines for thyroid nodules and DTC after an extensive review of articles and intense discussion on whether we should accept the changes in the 2015 ATA guidelines. This paper introduces and discusses the updated major issues and differences in the ATA and the KTA guidelines.

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Thyroid
The Diagnosis and Management of Hyperthyroidism in Korea: Consensus Report of the Korean Thyroid Association: Jae Hoon Moon, Ka Hee Yi; Endocrinol Metab. 2013;28(4):275-279. Published online December 12, 2013; DOI: https://doi.org/10.3803/EnM.2013.28.4.275

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Abstract PDF PubReader

Hyperthyroidism is one of the causes of thyrotoxicosis and the most common cause of hyperthyroidism in Korea is Graves disease. The diagnosis and treatment of Graves disease are different according to geographical area. Recently, the American Thyroid Association and the American Association of Clinical Endocrinologists suggested new management guidelines for hyperthyroidism. However, these guidelines are different from clinical practice in Korea and are difficult to apply. Therefore, the Korean Thyroid Association (KTA) conducted a survey of KTA members regarding the diagnosis and treatment of hyperthyroidism, and reported the consensus on the management of hyperthyroidism. In this review, we summarized the KTA report on the contemporary practice patterns in the diagnosis and management of hyperthyroidism, and compared this report with guidelines from other countries.

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Jung Min Bae, June Hyunkyung Lee, Jae Seung Yun, Byeol Han, Tae Young Han
Journal of the American Academy of Dermatology.2017; 76(5): 871. CrossRef
Increased risk of thyroid diseases in patients with systemic lupus erythematosus: A nationwide population-based Study in Korea
Jae-Seung Yun, Jung Min Bae, Ki-Jo Kim, Yu Seok Jung, Gyong Moon Kim, Hyung-Rae Kim, Jun-Seok Lee, Seung-Hyun Ko, Seon-Ah Cha, Yu-Bae Ahn, Ludmila Prokunina-Olsson
PLOS ONE.2017; 12(6): e0179088. CrossRef
The Second Antithyroid Drug Treatment Is Effective in Relapsed Graves' Disease Patients: A Median 11-Year Follow-Up Study
Ye An Kim, Sun Wook Cho, Hoon Sung Choi, Shinje Moon, Jae Hoon Moon, Kyung Won Kim, Do Joon Park, Ka Hee Yi, Young Joo Park, Bo Youn Cho
Thyroid.2017; 27(4): 491. CrossRef
Free Thyroxine, Anti-Thyroid Stimulating Hormone Receptor Antibody Titers, and Absence of Goiter Were Associated with Responsiveness to Methimazole in Patients with New Onset Graves' Disease
Hoon Sung Choi, Won Sang Yoo
Endocrinology and Metabolism.2017; 32(2): 281. CrossRef
Long-Term Antithyroid Drug Treatment: A Systematic Review and Meta-Analysis
Fereidoun Azizi, Ramin Malboosbaf
Thyroid.2017; 27(10): 1223. CrossRef
The Recurrence Rate of Graves' Disease among Patients with Subclinical Thyrotoxicosis after Initial Remission with Antithyroid Agents
Myoung Sook Shim, Soo Min Nam, Jin Sae Yoo, Hae Kyung Kim, Sang Jun Lee, Mi Young Lee
International Journal of Thyroidology.2017; 10(2): 77. CrossRef
Serum 25-hydroxyvitamin D might be an independent prognostic factor for Graves disease recurrence
Hwa Young Ahn, Yun Jae Chung, Bo Youn Cho
Medicine.2017; 96(31): e7700. CrossRef
Recent Advances in Autoimmune Thyroid Diseases
Won Sang Yoo, Hyun Kyung Chung
Endocrinology and Metabolism.2016; 31(3): 379. CrossRef
Usefulness of Measuring Thyroid Stimulating Antibody at the Time of Antithyroid Drug Withdrawal for Predicting Relapse of Graves Disease
Hyemi Kwon, Won Gu Kim, Eun Kyung Jang, Mijin Kim, Suyeon Park, Min Ji Jeon, Tae Yong Kim, Jin-Sook Ryu, Young Kee Shong, Won Bae Kim
Endocrinology and Metabolism.2016; 31(2): 300. CrossRef
Hyperthyroidism
Simone De Leo, Sun Y Lee, Lewis E Braverman
The Lancet.2016; 388(10047): 906. CrossRef
Differentiating Graves' disease from subacute thyroiditis using ratio of serum free triiodothyronine to free thyroxine
Chutintorn Sriphrapradang, Adikan Bhasipol
Annals of Medicine and Surgery.2016; 10: 69. CrossRef
Management of hyperthyroid patients in dental emergencies: a case report
Kyung-Jin Lee, Wonse Park, Nan-Sim Pang, Jin-Hyung Cho, Kee-Deog Kim, Bock Young Jung, Eun-Jung Kwak
Journal of Dental Anesthesia and Pain Medicine.2016; 16(2): 147. CrossRef
The Presence of Thyroid-Stimulation Blocking Antibody Prevents High Bone Turnover in Untreated Premenopausal Patients with Graves’ Disease
Sun Wook Cho, Jae Hyun Bae, Gyeong Woon Noh, Ye An Kim, Min Kyong Moon, Kyoung Un Park, Junghan Song, Ka Hee Yi, Do Joon Park, June-Key Chung, Bo Youn Cho, Young Joo Park, Jung-Eun Kim
PLOS ONE.2015; 10(12): e0144599. CrossRef
Refractory Graves' Disease Successfully Cured by Adjunctive Cholestyramine and Subsequent Total Thyroidectomy
Yeoree Yang, Seawon Hwang, Minji Kim, Yejee Lim, Min-Hee Kim, Sohee Lee, Dong-Jun Lim, Moo-Il Kang, Bong-Yun Cha
Endocrinology and Metabolism.2015; 30(4): 620. CrossRef
Improved quality of life in hyperthyroidism patients after surgery
Branka Bukvic, Vladan Zivaljevic, Sandra Sipetic, Aleksandar Diklic, Katarina Tausanovic, Dragos Stojanovic, Dejan Stevanovic, Ivan Paunovic
Journal of Surgical Research.2015; 193(2): 724. CrossRef
Brief Review of Articles in 'Endocrinology and Metabolism' in 2013
Won-Young Lee
Endocrinology and Metabolism.2014; 29(3): 251. CrossRef

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