Endocrinology and Metabolism

Original Articles

Thyroid
Efficacy and Safety of Long-Term Methimazole versus Radioactive Iodine in the Treatment of Toxic Multinodular Goiter: Fereidoun Azizi, Navid Saadat, Mir Alireza Takyar, Hengameh Abdi, Ladan Mehran, Atieh Amouzegar; Endocrinol Metab. 2022;37(6):861-869. Published online November 23, 2022; DOI: https://doi.org/10.3803/EnM.2022.1476

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Background
This study compared the degree of sustained control of hyperthyroidism in patients with toxic multinodular goiter (TMNG) treated with long-term methimazole (LT-MMI) or radioactive iodine (RAI).
Methods
In this clinical trial, 130 untreated patients with TMNG were randomized to either LT-MMI or RAI treatment. Both groups were followed for 108 to 148 months, with median follow-up durations of 120 and 132 months in the LT-MMI and RAI groups, respectively. Both groups of patients were followed every 1 to 3 months in the first year and every 6 months thereafter.
Results
After excluding patients in whom the treatment modality was changed and those who were lost to follow-up, 53 patients in the LT-MMI group and 54 in the RAI group completed the study. At the end of the study period, 50 (96%) and 25 (46%) patients were euthyroid, and two (4%) and 25 (46%) were hypothyroid in LT-MMI and RAI groups, respectively. In the RAI group, four (8%) patients had subclinical hyperthyroidism. The mean time to euthyroidism was 4.3±1.3 months in LT-MMI patients and 16.3± 15.0 months in RAI recipients (P<0.001). Patients treated with LT-MMI spent 95.8%±5.9% of the 12-year study period in a euthyroid state, whereas this proportion was 72.4%±14.8% in the RAI-treated patients (P<0.001). No major treatment-related adverse events were observed in either group.
Conclusion
In patients with TMNG, LT-MMI therapy is superior to RAI treatment, as shown by the earlier achievement of euthyroidism and the longer duration of sustained normal serum thyrotropin.

Citations

Citations to this article as recorded by

Management of hyperthyroidism in adults in India: Consensus statement of the Indian Thyroid Society
Shashank Joshi, Krishna Seshadri, Sujoy Ghosh, Pramila Kalra, Arun S. Menon, Himagirish K. Rao, Mini G. Pillai, Sarita Bajaj, YP Ganavi, Narendra Kotwal, Rajesh Rajput
Thyroid Research and Practice.2026; 22(1): 1. CrossRef
Analysis of the Clinical Characteristics of 45 Patients with Toxic Goiter in a Single Center
秋娥刘
Advances in Clinical Medicine.2025; 15(03): 2091. CrossRef
Antithyroid drugs and the dose–risk balance: a meta-analysis on agranulocytosis in hyperthyroidism
Luis Agustín Ramírez Stieben, Lucas Ricardo Brun, Paula Nasazzi Doddi, María Lorena Brance
Endocrine.2025; 90(2): 391. CrossRef
Methimazole-Induced Agranulocytosis: A Clinical Case Report
João Menino, Inês Meira, Juliana Gonçalves, Sara Ribeiro, Jorge Pedro, Joana Queirós
Endocrinology Insights.2025; 20(2): 112. CrossRef
Effects of iodine and fluorine levels in the environment on thyroid function indicators in Hebei Province, China
Yanguo Li, Ruixia Yan, Yuan Zhou, Wen Tang, Qiannan Li, Shuzhen Li, Liping Zhang
Annals of Human Biology.2025;[Epub] CrossRef
Control rate of hyperthyroidism and its associated factors after prolonged use of anti-thyroid drugs in a hospital setting, Northwest Ethiopia
Seyoum Mengesha, Abilo Tadesse, Biruk Mulat Worku, Kifle Alamrew, Tesfaye Yesuf, Yonas Gedamu
Medicine.2024; 103(23): e38201. CrossRef
Approach to the Patient Considering Long-term Antithyroid Drug Therapy for Graves’ Disease
Fereidoun Azizi, Ladan Mehran, Hengameh Abdi, Atieh Amouzegar
The Journal of Clinical Endocrinology & Metabolism.2024; 109(10): e1881. CrossRef
Mechanism of Huatan Sanjie Fang in improving goiter in Graves' disease mice based on the Hippo signaling pathway
Huimin Yuan, Wenxin Ma, Yifei Song, Hang Wang, Shuxin Yan, Silan Hao, Xiaoyun Zhu, Yang Tang
Journal of Traditional Chinese Medical Sciences.2023; 10(3): 289. CrossRef

Thyroid
Clinical Outcomes of Repeated Radioactive Iodine Therapy for Graves’ Disease: Min Joo Kim, Sun Wook Cho, Ye An Kim, Hoon Sung Choi, Young Joo Park, Do Joon Park, Bo Youn Cho; Endocrinol Metab. 2022;37(3):524-532. Published online June 16, 2022; DOI: https://doi.org/10.3803/EnM.2022.1418

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Background
Radioactive iodine (RAI) therapy is a successful therapeutic modality for Graves’ disease. However, RAI therapy can fail, and RAI therapy after antithyroid drugs (ATDs) has a lower remission rate. Therefore, many patients require repeated RAI therapy. This study investigated the clinical outcomes of repeated RAI therapy for Graves’ disease.
Methods
Patients who underwent RAI therapy as second-line therapy after failure of ATD treatment between 2001 and 2015 were reviewed. Remission was defined as hypothyroid or euthyroid status without ATD, and with or without levothyroxine at 12 months after RAI therapy.
Results
The 1-year remission rate after 2nd RAI therapy (66%, 152/230) is significantly higher than that after 1st RAI therapy (48%, 393/815) or long-term ATD treatment after 1st RAI therapy failure (42%). The clinical response to 2nd RAI therapy was more rapid. The median time intervals from the 2nd RAI therapy to ATD discontinuation (1.3 months) and to the start of levothyroxine replacement (2.5 months) were significantly shorter than those for the 1st RAI therapy. A smaller goiter size, a longer time interval between the 1st and 2nd RAI therapies, and a longer ATD discontinuation period predicted remission after the 2nd RAI therapy. Finally, in 78 patients who failed the 2nd RAI therapy, the mean ATD dosage significantly reduced 5.1 mg over 12 months.
Conclusion
Repeated RAI therapy can be a good therapeutic option, especially in patients with smaller goiters and those who are more responsive to the 1st RAI therapy.

Citations

Citations to this article as recorded by

Outcome of MRI-Guided Single-Dose Iodine-131 for Graves’ Hyperthyroidism with Large Goiter
Shangcheng Yan, Xiansheng Chen, Bing Yan, Xin Li, Zhen Cao, Pan Zhang, Yajun Wang, Wenmei Guo, Ziwen Liu
Annals of Nuclear Medicine.2026; 40(6): 624. CrossRef
Outcomes of Fixed-Dose Radioactive Iodine Therapy in Hyperthyroidism and Optimization of Follow-Up After Treatment Failure With Low-Dose Antithyroid Medication
Panita Kantikool, Naphat Buraphanawibun
Cureus.2025;[Epub] CrossRef
Tingkat Keberhasilan Terapi Radioiodin Pertama pada Pasien Graves’ Disease
Aliya Khadijah Kemaleratu, Yuliana Rahmah Retnaningrum, Yudanti Riastiti
Jurnal Sains dan Kesehatan.2025; 6(1): 1. CrossRef
Association of high‐dose radioactive iodine therapy with PPM1D‐mutated clonal hematopoiesis in older individuals
Jaeryuk Kim, Sungwoo Bae, Jaeyong Choi, Sun‐Wha Im, Bukyoung Cha, Gyeongseo Jung, Sun Wook Cho, Eul‐Ju Seo, Young Ah Lee, Jin Chul Paeng, Young Joo Park, Jong‐Il Kim
Molecular Oncology.2025; 19(11): 3079. CrossRef
Characteristics of Japanese patients with Graves’ disease who fail first radioiodine therapy
Yuki Yamamoto, Hiroshi Fukazawa, Jun Ito, Kei Ito, Masanao Fujii, Aiko Hosoda, Yoshinori Osaki, Hiroaki Yagyu
Thyroid Science.2025; 2(4): 100028. CrossRef
Prospective study to evaluate radioactive iodine of 20 mCi vs 10–15 mCi in Graves’ disease
Wasit Kanokwongnuwat, Nawarat Penpong
BMC Endocrine Disorders.2024;[Epub] CrossRef
The Early Changes in Thyroid-Stimulating Immunoglobulin Bioassay over Anti-Thyroid Drug Treatment Could Predict Prognosis of Graves’ Disease
Jin Yu, Han-Sang Baek, Chaiho Jeong, Kwanhoon Jo, Jeongmin Lee, Jeonghoon Ha, Min Hee Kim, Jungmin Lee, Dong-Jun Lim
Endocrinology and Metabolism.2023; 38(3): 338. CrossRef
Effect of liver dysfunction on outcome of radioactive iodine therapy for Graves’ disease
Yuyang Ze, Fei Shao, Xuefeng Feng, Shanmei Shen, Yan Bi, Dalong Zhu, Xiaowen Zhang
BMC Endocrine Disorders.2022;[Epub] CrossRef

Clinical Study
Clinical Outcomes after Early and Delayed Radioiodine Remnant Ablation in Patients with Low-Risk Papillary Thyroid Carcinoma: Propensity Score Matching Analysis: Jonghwa Ahn, Meihua Jin, Eyun Song, Min Ji Jeon, Tae Yong Kim, Jin-Sook Ryu, Won Bae Kim, Young Kee Shong, Ji Min Han, Won Gu Kim; Endocrinol Metab. 2020;35(4):830-837. Published online November 18, 2020; DOI: https://doi.org/10.3803/EnM.2020.747

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Background
The clinical outcomes of delayed radioiodine remnant ablation (RRA) therapy in patients with low-risk papillary thyroid carcinoma (PTC) are unclear. We aimed to evaluate the clinical impact of the interval between total thyroidectomy (TT) and RRA therapy in patients with low-risk PTC.
Methods
We included 526 patients who underwent TT and RRA for low-risk PTC with a primary tumor size of >1 cm between 2000 and 2012. Patients were divided into the early (<90 days) and the delayed (≥90 days) RRA groups based on the interval between TT and RRA. The results of diagnostic whole-body scan (DxWBS), ongoing risk stratification (ORS; response to therapy), and disease-free survival (DFS) were evaluated before and after propensity score matching (PSM).
Results
Among the 526 patients, 75 (14.3%) patients underwent delayed RRA; they had more cervical lymph node metastasis and received a higher RRA dose than those who underwent early RRA. The median follow-up period was 9.1 years after initial therapy, and the structural recurrence rate was 1.9%. In DxWBS, 60 patients had focal iodine uptake limited in operative bed, with no significant difference between groups. According to ORS, 78%, 20%, 1%, and 1% patients were classified into excellent, indeterminate, biochemical incomplete, and structural incomplete response groups, respectively. There was no significant difference in ORS or DFS between groups before and after PSM.
Conclusion
The timing of the first RRA had no clinical impact in patients with low-risk PTC. Thus, the clinical decision for RRA can be determined >3 months after TT considering other prognostic factors.

Citations

Citations to this article as recorded by

Dynamic risk assessment in patients with differentiated thyroid cancer
Erika Abelleira, Fernando Jerkovich
Reviews in Endocrine and Metabolic Disorders.2024; 25(1): 79. CrossRef
Ablation Rates and Long-Term Outcome Following Low-Dose Radioiodine for Differentiated Thyroid Cancer in the West of Scotland: A Retrospective Analysis
Kathryn Graham, Fay Tough, Helena Belikova, Irene Wotherspoon, David Colville, Nicholas Reed
Endocrine Practice.2024; 30(4): 327. CrossRef
Radioiodine ablation after thyroidectomy could be safely abandoned or postponed in selected stage I papillary thyroid carcinoma patients of low-risk group: an observational prospective study
S.M. Cherenko, A.Yu. Glagolieva, D.E. Makhmudov
INTERNATIONAL JOURNAL OF ENDOCRINOLOGY (Ukraine).2024; 20(1): 7. CrossRef
Analysis of delayed initial radioactive iodine therapy and clinical outcomes in papillary thyroid cancer: a two-center retrospective study
Tao He, Ming Li, Zheng-lian Gao, Xiang-yu Li, Hai-rong Zhong, Cui-shuang Ding, Hua-wei Cai
Nuclear Medicine Communications.2024; 45(9): 779. CrossRef
Advances in the selection and timing of postoperative radioiodine treatment in patients with differentiated thyroid carcinoma
Xin Dai, Xinyi Ren, Jinyu Zhang, Yuxin Zheng, Zhengjie Wang, Gang Cheng
Annals of Nuclear Medicine.2024; 38(9): 688. CrossRef
Comparative evaluation of low and high radioiodine doses in differentiated thyroid carcinoma management: A multicenter study
M.B. Al-Osaimi, E.M. Abdelrazek, Ehab M. Attalla, Hosam Salaheldin
Journal of Radiation Research and Applied Sciences.2024; 17(4): 101206. CrossRef
Patient Preparation and Radiation Protection Guidance for Adult Patients Undergoing Radioiodine Treatment for Thyroid Cancer in the UK
J. Wadsley, N. Armstrong, V. Bassett-Smith, M. Beasley, R. Chandler, L. Cluny, A.J. Craig, K. Farnell, K. Garcez, N. Garnham, K. Graham, A. Hallam, S. Hill, H. Hobrough, F. McKiddie, M.W.J. Strachan
Clinical Oncology.2023; 35(1): 42. CrossRef
Delay of initial radioactive iodine therapy beyond 3 months has no effect on clinical responses and overall survival in patients with thyroid carcinoma: A cohort study and a meta‐analysis
Fang Cheng, Juan Xiao, Fengyan Huang, Chunchun Shao, Shouluan Ding, Canhua Yun, Hongying Jia
Cancer Medicine.2022; 11(12): 2386. CrossRef
Delayed (>3 Months) Postoperative Radioactive Iodine Ablation Does Not Impact Clinical Response or Survival in Differentiated Thyroid Cancers
Tatiana Fedorova, Lilah F. Morris-Wiseman
Clinical Thyroidology.2022; 34(10): 456. CrossRef

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