Endocrinology and Metabolism

Original Articles

Thyroid Big Data Articles (National Health Insurance Service Database)
Unveiling Risk Factors for Treatment Failure in Patients with Graves’ Disease: A Nationwide Cohort Study in Korea: Jung A Kim, Kyeong Jin Kim, Jimi Choi, Kyoung Jin Kim, Eyun Song, Ji Hee Yu, Nam Hoon Kim, Hye Jin Yoo, Ji A Seo, Nan Hee Kim, Kyung Mook Choi, Sei Hyun Baik, Sin Gon Kim; Endocrinol Metab. 2025;40(1):125-134. Published online January 13, 2025; DOI: https://doi.org/10.3803/EnM.2024.2093

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Background
Antithyroid drug (ATD) treatment is the preferred initial treatment for Graves’ disease (GD) in South Korea, despite higher treatment failure rates than radioactive iodine (RAI) therapy or thyroidectomy. This study aimed to evaluate the incidence of treatment failure associated with the primary modalities for GD treatment in real-world practice.
Methods
We included 452,001 patients diagnosed with GD between 2004 and 2020 from the Korean National Health Insurance Service-National Health Information Database. Treatment failure was defined as switching from ATD, RAI, or thyroidectomy treatments, and for ATD specifically, inability to discontinue medication for over 2 years.
Results
Mean age was 46.2 years, with females constituting 70.8%. Initial treatments for GD included ATDs (98.0%), thyroidectomy (1.3%), and RAI (0.7%), with a noted increment in ATD application from 96.2% in 2004 to 98.8% in 2020. During a median follow- up of 8.5 years, the treatment failure rates were 58.5% for ATDs, 21.3% for RAI, and 2.1% for thyroidectomy. Multivariate analysis indicated that the hazard ratio for treatment failure with ATD was 2.81 times higher than RAI. RAI treatments ≥10 mCi had 37% lower failure rates than doses <10 mCi.
Conclusion
ATDs are the most commonly used for GD in South Korea, followed by thyroidectomy and RAI. Although the risk of treatment failure for ATD is higher than that of RAI therapy, initial RAI treatment in South Korea is relatively limited compared to that in Western countries. Further studies are required to evaluate the cause of low initial RAI treatment rates in South Korea.

Citations

Citations to this article as recorded by

Treatment of Graves’ Disease: Faster Remission or Longer but Safe, That Is the Question
Chan-Hee Jung
Endocrinology and Metabolism.2025; 40(1): 70. CrossRef

Diabetes, obesity and metabolism Big Data Articles (National Health Insurance Service Database)
Risk of Diabetes Mellitus in Adults with Intellectual Disabilities: A Nationwide Cohort Study: Hye Yeon Koo, In Young Cho, Yoo Jin Um, Yong-Moon Mark Park, Kyung Mee Kim, Chung Eun Lee, Kyungdo Han; Endocrinol Metab. 2025;40(1):103-111. Published online November 20, 2024; DOI: https://doi.org/10.3803/EnM.2024.2126

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Abstract PDF Supplementary Material PubReader ePub: Background
Intellectual disability (ID) may be associated with an increased risk of diabetes mellitus (DM). However, evidence from longitudinal studies is scarce, particularly in Asian populations.
Methods
This retrospective cohort study used representative linked data from the Korea National Disability Registration System and the National Health Insurance Service database. Adults (≥20 years) who received a national health examination in 2009 (3,385 individuals with ID and 3,463,604 individuals without ID) were included and followed until 2020. ID was identified using legal registration information. Incident DM was defined by prescription records with relevant diagnostic codes. Multivariable-adjusted Cox proportional hazards regression models were used to estimate the adjusted hazard ratio (aHR) and 95% confidence interval (CI) for DM risks in individuals with ID compared to those without ID.
Results
Over a mean follow-up of 9.8 years, incident DM occurred in 302 (8.9%) individuals with ID and 299,156 (8.4%) individuals without ID. Having ID was associated with increased DM risk (aHR, 1.38; 95% CI, 1.23 to 1.55). Sensitivity analysis confirmed a higher DM risk in individuals with ID (aHR, 1.39; 95% CI, 1.24 to 1.56) than those with other disabilities (aHR, 1.11; 95% CI, 1.10 to 1.13) or no disability (reference). Stratified analysis showed higher DM risk in non-hypertensive subjects (aHR, 1.63; 95% CI, 1.43 to 1.86) compared to hypertensive subjects (aHR, 1.00; 95% CI, 0.80 to 1.26; P for interaction <0.001).
Conclusion
Adults with ID have an increased risk of developing DM, highlighting the need for targeted public health strategies to promote DM prevention in this population.

Mineral, Bone & Muscle Big Data Articles (National Health Insurance Service Database)
Elevated Fracture Risks in Patients Using Inhaled Corticosteroids: A Korean Nationwide Study: Sung Hye Kong, Ae Jeong Jo, Chan Mi Park, Kyun Ik Park, Ji Eun Yun, Jung Hee Kim; Endocrinol Metab. 2025;40(1):82-92. Published online August 30, 2024; DOI: https://doi.org/10.3803/EnM.2024.1990

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In this comprehensive retrospective nationwide cohort study, we examined the relationships between various asthma medications and bone health, utilizing data from the National Health Insurance Service database of South Korea.
Methods
From 2015 to 2019, the relevant dataset included 168,611 individuals aged 66 years, among whom 8,747 were diagnosed with asthma. We focused on a subset of 6,173 patients, all 66-year-old women. Participants were categorized into four groups: nonusers of asthma medication (n=2,868), leukotriene antagonist users (n=2,281), inhaled corticosteroid (ICS) users (n=517), and those using a combination of ICS and long-acting beta-agonist (ICS+LABA) medication (n=507). The primary outcomes measured were the incidences of major osteoporotic fractures and hip fractures during the follow-up period.
Results
Over 2.7 years of follow-up, 615 cases of major osteoporotic fractures and 96 cases of hip fractures were recorded. ICS users exhibited a heightened risk of both injuries, with hazard ratios of 1.38 (95% confidence interval [CI], 1.18 to 1.63; P<0.001) for major osteoporotic fractures and 1.56 (95% CI, 1.33 to 1.83; P<0.001) for hip fractures. Similarly elevated risks were observed in the ICS+LABA group. Notably, the risk associated with ICS was particularly pronounced among patients with osteopenia for both fracture types. Overall, the use of ICS, alone or in combination with LABA, in patients with asthma is associated with significantly increased risks of osteoporotic fractures, especially among those with osteopenia.
Conclusion
These findings underscore the importance of considering bone health when managing asthma, especially in older patients and those with existing bone density issues.

Namgok Lecture 2024

Hypothalamus and pituitary gland Big Data Articles (National Health Insurance Service Database)
Long-Term Prognosis and Systemic Impact of Acromegaly: Analyses Utilizing Korean National Health Insurance Data: Sangmo Hong, Kyungdo Han, Cheol-Young Park; Endocrinol Metab. 2025;40(1):1-9. Published online February 4, 2025; DOI: https://doi.org/10.3803/EnM.2024.2285

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Abstract PDF PubReader ePub: Acromegaly is a rare endocrine disorder caused by excessive growth hormone secretion. Its low prevalence poses challenges in studying its long-term prognosis and systemic effects. To address this research gap, we conducted five studies using nationwide cohort data from the Korean National Health Insurance Database (NHID). This review consolidates the findings of these studies, which examined various long-term effects of acromegaly. The results demonstrated significant associations between acromegaly and increased mortality, a higher prevalence of mortality, cardiovascular outcomes, neurodegenerative diseases, depression, end-stage kidney disease, respiratory complications, specifically bronchiectasis, spine & hip fracture, and malignancy. These findings highlight the critical need for early diagnosis, comprehensive care, and long-term monitoring, and underscore the importance of a multidisciplinary approach in managing acromegaly.

Original Articles

Thyroid Big Data Articles (National Health Insurance Service Database)
Rising Incidence and Comorbidities of Endogenous Hypothyroidism in Republic of Korea from 2004 to 2018: A Nationwide Population Study: Chae Won Chung, Hwa Young Ahn, Sun Wook Cho, Ka Hee Yi; Endocrinol Metab. 2024;39(6):891-898. Published online September 23, 2024; DOI: https://doi.org/10.3803/EnM.2024.1996

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Abstract PDF Supplementary Material PubReader ePub: Background
Hypothyroidism, a prevalent endocrine disorder, results from insufficient thyroid hormone production or release, affecting metabolism. However, disparities in comorbidities and treatment trajectories may exist between endogenous and exogenous hypothyroidism.
Methods
Data from the Korean National Health Insurance Service from 2004 to 2018. Endogenous hypothyroidism was defined as cases with two or more diagnostic codes for hypothyroidism coupled with a history of thyroid hormone intake exceeding 60 days. To eliminate iatrogenic hypothyroidism, individuals with diagnosis codes for thyroid cancer, treatment codes for thyroid surgery, or radiotherapy were excluded. Hypothyroidism-related comorbidities were defined as new occurrences of the corresponding diagnosis code after the diagnosis of hypothyroidism during the entire study period.
Results
The age-standardized incidence of endogenous hypothyroidism among men was 0.2 per 1,000 person-years in 2004, increasing to 0.8 in 2018. Among women, the incidence increased from 1.6 per 1,000 person-years in 2004 to 3.7 in 2018. When comparing age groups of 20s–50s and 60s–90s, both sexes in the 60s–90s demonstrated a more rapid increase in incidence than those in the 20s–50s age range. Patients with endogenous hypothyroidism demonstrated a higher incidence of mood disorders across all age groups and cerebrovascular disease in individuals ≥60 years old, regardless of sex.
Conclusion
In Republic of Korea, endogenous hypothyroidism incidence has been increased in recent years. The incidence of endogenous hypothyroidism is increasing more rapidly in men than in women, especially in the elderly. Patients with endogenous hypothyroidism seem to have a heightened risk for cerebrovascular disease and mood disorders.

Thyroid Big Data Articles (National Health Insurance Service Database)
Risk of Subsequent Primary Cancers in Thyroid Cancer Survivors according to the Dose of Levothyroxine: A Nationwide Cohort Study: Min-Su Kim, Jang Won Lee, Min Kyung Hyun, Young Shin Song; Endocrinol Metab. 2024;39(2):288-299. Published online March 4, 2024; DOI: https://doi.org/10.3803/EnM.2023.1815

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Background
Current research has not investigated the effect of thyroid-stimulating hormone suppression therapy with levothyroxine on the risk for developing subsequent primary cancers (SPCs). This study aimed to investigate the association between levothyroxine dosage and the risk for SPCs in thyroid cancer patients.
Methods
We conducted a nationwide population-based retrospective cohort study form Korean National Health Insurance database. This cohort included 342,920 thyroid cancer patients between 2004 and 2018. Patients were divided into the non-levothyroxine and the levothyroxine groups, the latter consisting of four dosage subgroups according to quartiles. Cox proportional hazard models were performed to evaluate the risk for SPCs by adjusting for variables including cumulative doses of radioactive iodine (RAI) therapy.
Results
A total of 17,410 SPC cases were observed over a median 7.3 years of follow-up. The high-dose levothyroxine subgroups (Q3 and Q4) had a higher risk for SPC (adjusted hazard ratio [HR], 1.14 and 1.27; 95% confidence interval [CI], 1.05–1.24 and 1.17– 1.37; respectively) compared to the non-levothyroxine group. In particular, the adjusted HR of stomach (1.31), colorectal (1.60), liver and biliary tract (1.95), and pancreatic (2.48) cancers were increased in the Q4 subgroup. We consistently observed a positive association between high levothyroxine dosage per body weight and risk of SPCs, even after adjusting for various confounding variables. Moreover, similar results were identified in the stratified analyses according to thyroidectomy type and RAI therapy, as well as in a subgroup analysis of patients with good adherence.
Conclusion
High-dose levothyroxine use was associated with increased risk of SPCs among thyroid cancer patients regardless of RAI therapy.

Citations

Citations to this article as recorded by

Tailoring TSH suppression in differentiated thyroid carcinoma: evidence, controversies, and future directions
Xinxin Song, Xin Zhi, Linxue Qian
Endocrine.2025;[Epub] CrossRef
The Levothyroxine Odyssey: Navigating the Path of Survivorship in Thyroid Cancer
Jin Hwa Kim
Endocrinology and Metabolism.2024; 39(2): 283. CrossRef
Levothyroxine Dosage and the Increased Risk of Second Primary Malignancy in Thyroid Cancer Survivors
Young Joo Park
Clinical Thyroidology®.2024; 36(7): 258. CrossRef

Diabetes, obesity and metabolism Big Data Articles (National Health Insurance Service Database)
Long-Term Cumulative Exposure to High γ-Glutamyl Transferase Levels and the Risk of Cardiovascular Disease: A Nationwide Population-Based Cohort Study: Han-Sang Baek, Bongseong Kim, Seung-Hwan Lee, Dong-Jun Lim, Hyuk-Sang Kwon, Sang-Ah Chang, Kyungdo Han, Jae-Seung Yun; Endocrinol Metab. 2023;38(6):770-781. Published online November 6, 2023; DOI: https://doi.org/10.3803/EnM.2023.1726

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Background
Elevated γ-glutamyl transferase (γ-GTP) levels are associated with metabolic syndrome. We investigated the association of cumulative exposure to high γ-GTP with the risk of cardiovascular disease (CVD) in a large-scale population.
Methods
Using nationally representative data from the Korean National Health Insurance system, 1,640,127 people with 4 years of consecutive γ-GTP measurements from 2009 to 2012 were included and followed up until the end of 2019. For each year of the study period, participants were grouped by the number of exposures to the highest γ-GTP quartile (0–4), and the sum of quartiles (0–12) was defined as cumulative γ-GTP exposure. The hazard ratio for CVD was evaluated using the Cox proportional hazards model.
Results
During the 6.4 years of follow-up, there were 15,980 cases (0.97%) of myocardial infarction (MI), 14,563 (0.89%) of stroke, 29,717 (1.81%) of CVD, and 25,916 (1.58%) of death. Persistent exposure to high γ-GTP levels was associated with higher risks of MI, stroke, CVD, and death than those without such exposure. The risks of MI, stroke, CVD, and mortality increased in a dose-dependent manner according to total cumulative γ-GTP (all P for trend <0.0001). Subjects younger than 65 years, with a body mass index <25 kg/m², and without hypertension or fatty liver showed a stronger relationship between cumulative γ-GTP and the incidence of MI, CVD, and death.
Conclusion
Cumulative γ-GTP elevation is associated with CVD. γ-GTP could be more widely used as an early marker of CVD risk, especially in individuals without traditional CVD risk factors.

Citations

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Association of Serum Gamma-Glutamyltransferase with In-hospital Heart Failure in Patients with ST-segment Elevation Myocardial Infarction Undergoing Primary Percutaneous Coronary Intervention
An-Cheng Hou, Jian-Tong Hou, Wei-Ning Zhou, Yan-Jin Wei, Zhi-Hong Ou, Cun-Fei Liu
Reviews in Cardiovascular Medicine.2025;[Epub] CrossRef
The J-shaped relationship between the gamma-glutamyltransferase to high-density lipoprotein cholesterol ratio and mortality risk in U.S. adults
Shujuan Qiu, Chunlei Li, Zhentao Guo
Preventive Medicine Reports.2025; 52: 102958. CrossRef
Interplay of serum biomarkers bilirubin and γ-glutamyltranspeptidase in predicting cardiovascular complications in type-2 diabetes mellitus
Ebtesam Abdullah Al-Suhaimi, Abdullah Ahmed Al-Rubaish
World Journal of Diabetes.2024; 15(6): 1074. CrossRef

Mineral, Bone & Muscle Big Data Articles (National Health Insurance Service Database)
Increased Risk of Hip Fracture in Patients with Acromegaly: A Nationwide Cohort Study in Korea: Jiwon Kim, Namki Hong, Jimi Choi, Ju Hyung Moon, Eui Hyun Kim, Eun Jig Lee, Sin Gon Kim, Cheol Ryong Ku; Endocrinol Metab. 2023;38(6):690-700. Published online October 30, 2023; DOI: https://doi.org/10.3803/EnM.2023.1782

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Background
Acromegaly leads to various skeletal complications, and fragility fractures are emerging as a new concern in patients with acromegaly. Therefore, this study investigated the risk of fractures in Korean patients with acromegaly.
Methods
We used the Korean nationwide claims database from 2009 to 2019. A total of 931 patients with acromegaly who had never used an osteoporosis drug before and were treated with surgery alone were selected as study participants, and a 1:29 ratio of 26,999 age- and sex-matched osteoporosis drug-naïve controls without acromegaly were randomly selected from the database.
Results
The mean age was 46.2 years, and 50.0% were male. During a median follow-up of 54.1 months, there was no difference in the risks of all, vertebral, and non-vertebral fractures between the acromegaly and control groups. However, hip fracture risk was significantly higher (hazard ratio [HR], 2.73; 95% confidence interval [CI], 1.32 to 5.65), and non-hip and non-vertebral fractures risk was significantly lower (HR, 0.40; 95% CI, 0.17 to 0.98) in patients with acromegaly than in controls; these results remained robust even after adjustment for socioeconomic status and baseline comorbidities. Age, type 2 diabetes mellitus, cardio-cerebrovascular disease, fracture history, recent use of acid-suppressant medication, psychotropic medication, and opioids were risk factors for all fractures in patients with acromegaly (all P<0.05).
Conclusion
Compared with controls, patients surgically treated for acromegaly had a higher risk of hip fractures. The risk factors for fracture in patients with acromegaly were consistent with widely accepted risk factors in the general population.

Citations

Citations to this article as recorded by

Long-Term Prognosis and Systemic Impact of Acromegaly: Analyses Utilizing Korean National Health Insurance Data
Sangmo Hong, Kyungdo Han, Cheol-Young Park
Endocrinology and Metabolism.2025; 40(1): 1. CrossRef
Musculoskeletal disease in acromegaly—a population-based registry study
Christian Rosendal, Mai Christiansen Arlien-Søborg, Eigil Husted Nielsen, Claus Larsen Feltoft, Åse Krogh Rasmussen, Marianne Skovsager Andersen, Jens Otto Lunde Jørgensen, Jakob Dal
European Journal of Endocrinology.2025; 192(3): 308. CrossRef
Novel approach to bone comorbidity in resistant acromegaly
Stefano Frara, Matteo Acanfora, Vincenzo Franzese, Maria Luisa Brandi, Marco Losa, Andrea Giustina
Pituitary.2024; 27(6): 813. CrossRef

Mineral, Bone & Muscle Big Data Articles (National Health Insurance Service Database)
Association between Smoking Status and the Risk of Hip Fracture in Patients with Type 2 Diabetes: A Nationwide Population-Based Study: Se-Won Lee, Jun-Young Heu, Ju-Yeong Kim, Jinyoung Kim, Kyungdo Han, Hyuk-Sang Kwon; Endocrinol Metab. 2023;38(6):679-689. Published online December 6, 2023; DOI: https://doi.org/10.3803/EnM.2023.1760

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Background
Limited longitudinal evidence exists regarding the potential association between smoking status and hip fracture among individuals with type 2 diabetes. We investigated this association using large-scale, nationwide cohort data for the Korean population.
Methods
This nationwide cohort study included 1,414,635 adults aged 40 and older who received Korean National Health Insurance Service health examinations between 2009 and 2012. Subjects with type 2 diabetes were categorized according to their smoking status, amount smoked (pack-years), number of cigarettes smoked per day, and duration of smoking. The results are presented as hazard ratios (HRs) and 95% confidence intervals (CIs) for the associations between smoking status parameters and risk of hip fracture in multivariable Cox proportional hazard regression analysis.
Results
Compared with never-smokers, an increased adjusted HR (aHR) for hip fracture was observed in current smokers (1.681; 95% CI, 1.578 to 1.791), and a comparable aHR for hip fracture was found in former smokers (1.065; 95% CI, 0.999 to 1.136). For former smokers who had smoked 20 pack-years or more, the risk was slightly higher than that for never-smokers (aHR, 1.107; 95% CI, 1.024 to 1.196). The hip fracture risk of female former smokers was similar to that of female current smokers, but the hip fracture risk in male former smokers was similar to that of male never-smokers.
Conclusion
Smoking is associated with an increased risk of hip fracture in patients with type 2 diabetes. Current smokers with diabetes should be encouraged to quit smoking because the risk of hip fracture is greatly reduced in former smokers.

Citations

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Influence of quitting smoking on diabetes-related complications: A scoping review with a systematic search strategy
Magdalena Walicka, Arkadiusz Krysiński, Giusy Rita Maria La Rosa, Ang Sun, Davide Campagna, Agostino Di Ciaula, Tabinda Dugal, Andre Kengne, Phuong Le Dinh, Anoop Misra, Riccardo Polosa, Syed Abbas Raza, Cristina Russo, Roberta Sammut, Noel Somasundaram
Diabetes & Metabolic Syndrome: Clinical Research & Reviews.2024; 18(5): 103044. CrossRef

Diabetes, obesity and metabolism Big Data Articles (National Health Insurance Service Database)
Risk of Cause-Specific Mortality across Glucose Spectrum in Elderly People: A Nationwide Population-Based Cohort Study: Joonyub Lee, Hun-Sung Kim, Kee-Ho Song, Soon Jib Yoo, Kyungdo Han, Seung-Hwan Lee, Committee of Big Data, Korean Endocrine Society; Endocrinol Metab. 2023;38(5):525-537. Published online September 7, 2023; DOI: https://doi.org/10.3803/EnM.2023.1765

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Background
This study investigated the risk of cause-specific mortality according to glucose tolerance status in elderly South Koreans.
Methods
A total of 1,292,264 individuals aged ≥65 years who received health examinations in 2009 were identified from the National Health Information Database. Participants were classified as normal glucose tolerance, impaired fasting glucose, newly-diagnosed diabetes, early diabetes (oral hypoglycemic agents ≤2), or advanced diabetes (oral hypoglycemic agents ≥3 or insulin). The risk of system-specific and disease-specific deaths was estimated using multivariate Cox proportional hazards analysis.
Results
During a median follow-up of 8.41 years, 257,356 deaths were recorded. Diabetes was associated with significantly higher risk of all-cause mortality (hazard ratio [HR], 1.58; 95% confidence interval [CI], 1.57 to 1.60); death due to circulatory (HR, 1.49; 95% CI, 1.46 to 1.52), respiratory (HR, 1.51; 95% CI, 1.47 to 1.55), and genitourinary systems (HR, 2.22; 95% CI, 2.10 to 2.35); and neoplasms (HR, 1.30; 95% CI, 1.28 to 1.32). Diabetes was also associated with a significantly higher risk of death due to ischemic heart disease (HR, 1.70; 95% CI, 1.63 to 1.76), cerebrovascular disease (HR, 1.46; 95% CI, 1.41 to 1.50), pneumonia (HR, 1.69; 95% CI, 1.63 to 1.76), and acute or chronic kidney disease (HR, 2.23; 95% CI, 2.09 to 2.38). There was a stepwise increase in the risk of death across the glucose spectrum (P for trend <0.0001). Stroke, heart failure, or chronic kidney disease increased the risk of all-cause mortality at every stage of glucose intolerance.
Conclusion
A dose-dependent association between the risk of mortality from various causes and severity of glucose tolerance was noted in the elderly population.

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Inverse association between obesity and suicidal death risk
Joonyub Lee, Seung-Hwan Lee, Mee-Kyoung Kim, Hyuk-Sang Kwon, Jae-Seung Yun, Yeoree Yang, Kun-Ho Yoon, Jae-Hyoung Cho, Chi-Un Pae, Kyungdo Han, Jang Won Son
BMC Psychiatry.2025;[Epub] CrossRef
The growing range of complications of diabetes mellitus
Peter S. Hamblin, Anthony W. Russell, Stella Talic, Sophia Zoungas
Trends in Endocrinology & Metabolism.2025;[Epub] CrossRef
Effect of glucose variability on the mortality of adults aged 75 years and over during the first year of the COVID-19 pandemic
Miguel A. Salinero-Fort, F. Javier San Andrés-Rebollo, Juan Cárdenas-Valladolid, José Mostaza, Carlos Lahoz, Fernando Rodriguez-Artalejo, Paloma Gómez-Campelo, Pilar Vich-Pérez, Rodrigo Jiménez-García, José M. de-Miguel-Yanes, Javier Maroto-Rodriguez, Bel
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Islet transplantation in Korea
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Diabetes Research and Clinical Practice.2024; 217: 111876. CrossRef
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Kyoung Hwa Ha, Dae Jung Kim
Endocrinology and Metabolism.2024; 39(5): 669. CrossRef
Osteoporosis incidence and its associated factors in the older Korean population: findings from a population-based cohort study
Tanmoy Das, Md Abdullah Al Jubayer Biswas, Prosanta Mondal, Sabuj Sarker, Hyun J.“June” Lim
Archives of Osteoporosis.2024;[Epub] CrossRef
Income-Related Disparities in Mortality Among Young Adults With Type 2 Diabetes
Ji Yoon Kim, Sojeong Park, Minae Park, Nam Hoon Kim, Sin Gon Kim
JAMA Network Open.2024; 7(11): e2443918. CrossRef
The Characteristics and Risk of Mortality in the Elderly Korean Population
Sunghwan Suh
Endocrinology and Metabolism.2023; 38(5): 522. CrossRef

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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Unveiling Risk Factors for Treatment Failure in Patients with Graves’ Disease: A Nationwide Cohort Study in Korea
Jung A Kim, Kyeong Jin Kim, Jimi Choi, Kyoung Jin Kim, Eyun Song, Ji Hee Yu, Nam Hoon Kim, Hye Jin Yoo, Ji A Seo, Nan Hee Kim, Kyung Mook Choi, Sei Hyun Baik, Sin Gon Kim
Endocrinology and Metabolism.2025; 40(1): 125. CrossRef
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; 30(6): 537. CrossRef
Treatment Patterns and Preferences for Graves’ Disease in Korea: Insights from a Nationwide Cohort Study
Kyeong Jin Kim, Jimi Choi, Soo Myoung Shin, Jung A Kim, Kyoung Jin Kim, Sin Gon Kim
Endocrinology and Metabolism.2024; 39(4): 659. CrossRef
Dynamic Risk Model for the Medical Treatment of Graves’ Hyperthyroidism according to Treatment Duration
Meihua Jin, Chae A Kim, Min Ji Jeon, Won Bae Kim, Tae Yong Kim, Won Gu Kim
Endocrinology and Metabolism.2024; 39(4): 579. CrossRef
Effect of COVID-19 Vaccination on Thyroid Disease in 7 Million Adult and 0.2 Million Adolescent Vaccine Recipients
Sungho Bea, Hwa Young Ahn, Jieun Woo, Ju-Young Shin, Sun Wook Cho
The Journal of Clinical Endocrinology & Metabolism.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

Adrenal gland Big Data Articles (National Health Insurance Service Database)
Mortality and Severity of Coronavirus Disease 2019 in Patients with Long-Term Glucocorticoid Therapy: A Korean Nationwide Cohort Study: Eu Jeong Ku, Keeho Song, Kyoung Min Kim, Gi Hyeon Seo, Soon Jib Yoo; Endocrinol Metab. 2023;38(2):253-259. Published online March 21, 2023; DOI: https://doi.org/10.3803/EnM.2022.1607

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Background
The severity of coronavirus disease 2019 (COVID-19) among patients with long-term glucocorticoid treatment (LTGT) has not been established. We aimed to evaluate the association between LTGT and COVID-19 prognosis.
Methods
A Korean nationwide cohort database of COVID-19 patients between January 2019 and September 2021 was used. LTGT was defined as exposure to at least 150 mg of prednisolone (≥5 mg/day and ≥30 days) or equivalent glucocorticoids 180 days before COVID-19 infection. The outcome measurements were mortality, hospitalization, intensive care unit (ICU) admission, length of stay, and mechanical ventilation.
Results
Among confirmed patients with COVID-19, the LTGT group (n=12,794) was older and had a higher proportion of comorbidities than the control (n=359,013). The LTGT group showed higher in-hospital, 30-day, and 90-day mortality rates than the control (14.0% vs. 2.3%, 5.9% vs. 1.1%, and 9.9% vs. 1.8%, respectively; all P<0.001). Except for the hospitalization rate, the length of stay, ICU admission, and mechanical ventilation proportions were significantly higher in the LTGT group than in the control (all P<0.001). Overall mortality was higher in the LTGT group than in the control group, and the significance remained in the fully adjusted model (odds ratio [OR], 5.75; 95% confidence interval [CI], 5.31 to 6.23) (adjusted OR, 1.82; 95% CI, 1.67 to 2.00). The LTGT group showed a higher mortality rate than the control within the same comorbidity score category.
Conclusion
Long-term exposure to glucocorticoids increased the mortality and severity of COVID-19. Prevention and early proactive measures are inevitable in the high-risk LTGT group with many comorbidities.

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Hormonal Implications of SARS‐CoV‐2: A Review of Endocrine Disruptions
Aliya Yskak, Yevgeniy Sokharev, Kuanysh Zhumalynov, Elizaveta Koneva, Natalia Afanasyeva, Dmitri Borodulin, Dmitrii Babaskin, Almabek Nugmanov, Murat Nurushev, Vadim Chashkov, Gianmarco Ferrara
Scientifica.2025;[Epub] CrossRef
Outpatient glucocorticoid use and COVID-19 outcomes: a population-based study
Almudena Rodríguez-Fernández, Irene Visos-Varela, Maruxa Zapata-Cachafeiro, Samuel Pintos-Rodríguez, Rosa M. García-Álvarez, Teresa M. Herdeiro, María Piñeiro-Lamas, Adolfo Figueiras, Ángel Salgado-Barreira, Rosendo Bugarín-González, Eduardo Carracedo-Mar
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Glucocorticoids as a Double-Edged Sword in the Treatment of COVID-19: Mortality and Severity of COVID-19 in Patients Receiving Long-Term Glucocorticoid Therapy
Eun-Hee Cho
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Pituitary Diseases and COVID-19 Outcomes in South Korea: A Nationwide Cohort Study
Jeonghoon Ha, Kyoung Min Kim, Dong-Jun Lim, Keeho Song, Gi Hyeon Seo
Journal of Clinical Medicine.2023; 12(14): 4799. CrossRef

Diabetes, obesity and metabolism Big Data Articles (National Health Insurance Service Database)
Risk for Newly Diagnosed Type 2 Diabetes Mellitus after COVID-19 among Korean Adults: A Nationwide Matched Cohort Study: Jong Han Choi, Kyoung Min Kim, Keeho Song, Gi Hyeon Seo; Endocrinol Metab. 2023;38(2):245-252. Published online April 5, 2023; DOI: https://doi.org/10.3803/EnM.2023.1662

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Background
Coronavirus disease 2019 (COVID-19) can cause various extrapulmonary sequelae, including diabetes. However, it is unclear whether these effects persist 30 days after diagnosis. Hence, we investigated the incidence of newly diagnosed type 2 diabetes mellitus (T2DM) in the post-acute phase of COVID-19.
Methods
This cohort study used data from the Health Insurance Review and Assessment Service, a representative national healthcare database in Korea. We established a cohort of 348,180 individuals diagnosed with COVID-19 without a history of diabetes between January 2020 and September 2021. The control group consisted of sex- and age-matched individuals with neither a history of diabetes nor COVID-19. We assessed the hazard ratios (HR) of newly diagnosed T2DM patients with COVID-19 compared to controls, adjusted for age, sex, and the presence of hypertension and dyslipidemia.
Results
In the post-acute phase, patients with COVID-19 had an increased risk of newly diagnosed T2DM compared to those without COVID-19 (adjusted HR, 1.30; 95% confidence interval [CI], 1.27 to 1.33). The adjusted HRs of non-hospitalized, hospitalized, and intensive care unit-admitted patients were 1.14 (95% CI, 1.08 to 1.19), 1.34 (95% CI, 1.30 to 1.38), and 1.78 (95% CI, 1.59 to 1.99), respectively. The risk of T2DM in patients who were not administered glucocorticoids also increased (adjusted HR, 1.29; 95% CI, 1.25 to 1.32).
Conclusion
COVID-19 may increase the risk of developing T2DM beyond the acute period. The higher the severity of COVID-19 in the acute phase, the higher the risk of newly diagnosed T2DM. Therefore, T2DM should be included as a component of managing long-term COVID-19.

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Incidence of diabetes mellitus following hospitalisation for COVID‐19 in the United Kingdom: A prospective observational study
Freya Tyrer, Safoora Gharibzadeh, Clare Gillies, Claire Lawson, Ash Routen, Nazrul Islam, Cameron Razieh, Francesco Zaccardi, Tom Yates, Melanie J. Davies, Christopher E. Brightling, James D. Chalmers, Annemarie B. Docherty, Omer Elneima, Rachael A. Evans
Diabetes, Obesity and Metabolism.2025; 27(2): 767. CrossRef
Comparison of incidence trends of early-onset and late-onset type 2 diabetes in the Asia-Pacific region, 1990-2021: a join point regression analysis based on the global burden of disease study 2021
Chenying Lin, Haohua An, Jingna Lin, Yuejuan Cao, Zhen Yang
Frontiers in Endocrinology.2025;[Epub] CrossRef
New-Onset Diabetes Mellitus in COVID-19: A Scoping Review
Anca Pantea Stoian, Ioana-Cristina Bica, Teodor Salmen, Wael Al Mahmeed, Khalid Al-Rasadi, Kamila Al-Alawi, Maciej Banach, Yajnavalka Banerjee, Antonio Ceriello, Mustafa Cesur, Francesco Cosentino, Alberto Firenze, Massimo Galia, Su-Yen Goh, Andrej Janez,
Diabetes Therapy.2024; 15(1): 33. CrossRef
COVID-19 vaccines and blood glucose control: Friend or foe?
Walter Vena, Stella Pigni, Nazarena Betella, Annalisa Navarra, Marco Mirani, Gherardo Mazziotti, Andrea G. Lania, Antonio C. Bossi
Human Vaccines & Immunotherapeutics.2024;[Epub] CrossRef
Association of COVID-19 infection and the risk of new incident diabetes: a systematic review and meta-analysis
Jingye Zhou, Yuzhu Wang, Ruolan Xu
Frontiers in Endocrinology.2024;[Epub] CrossRef
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Kurt Taylor, Sophie Eastwood, Venexia Walker, Genevieve Cezard, Rochelle Knight, Marwa Al Arab, Yinghui Wei, Elsie M F Horne, Lucy Teece, Harriet Forbes, Alex Walker, Louis Fisher, Jon Massey, Lisa E M Hopcroft, Tom Palmer, Jose Cuitun Coronado, Samantha
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Diabetes & Metabolism Journal.2024; 48(4): 763. CrossRef
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Kyoung Hwa Ha, Dae Jung Kim
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Pituitary Diseases and COVID-19 Outcomes in South Korea: A Nationwide Cohort Study
Jeonghoon Ha, Kyoung Min Kim, Dong-Jun Lim, Keeho Song, Gi Hyeon Seo
Journal of Clinical Medicine.2023; 12(14): 4799. CrossRef

Diabetes, Obesity and Metabolism Big Data Articles (National Health Insurance Service Database)
Predicting the Risk of Insulin-Requiring Gestational Diabetes before Pregnancy: A Model Generated from a Nationwide Population-Based Cohort Study in Korea: Seung-Hwan Lee, Jin Yu, Kyungdo Han, Seung Woo Lee, Sang Youn You, Hun-Sung Kim, Jae-Hyoung Cho, Kun-Ho Yoon, Mee Kyoung Kim; Endocrinol Metab. 2023;38(1):129-138. Published online January 27, 2023; DOI: https://doi.org/10.3803/EnM.2022.1609

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Background
The severity of gestational diabetes mellitus (GDM) is associated with adverse pregnancy outcomes. We aimed to generate a risk model for predicting insulin-requiring GDM before pregnancy in Korean women.
Methods
A total of 417,210 women who received a health examination within 52 weeks before pregnancy and delivered between 2011 and 2015 were recruited from the Korean National Health Insurance database. The risk prediction model was created using a sample of 70% of the participants, while the remaining 30% were used for internal validation. Risk scores were assigned based on the hazard ratios for each risk factor in the multivariable Cox proportional hazards regression model. Six risk variables were selected, and a risk nomogram was created to estimate the risk of insulin-requiring GDM.
Results
A total of 2,891 (0.69%) women developed insulin-requiring GDM. Age, body mass index (BMI), current smoking, fasting blood glucose (FBG), total cholesterol, and γ-glutamyl transferase were significant risk factors for insulin-requiring GDM and were incorporated into the risk model. Among the variables, old age, high BMI, and high FBG level were the main contributors to an increased risk of insulin-requiring GDM. The concordance index of the risk model for predicting insulin-requiring GDM was 0.783 (95% confidence interval, 0.766 to 0.799). The validation cohort’s incidence rates for insulin-requiring GDM were consistent with the risk model’s predictions.
Conclusion
A novel risk engine was generated to predict insulin-requiring GDM among Korean women. This model may provide helpful information for identifying high-risk women and enhancing prepregnancy care.

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Anna S. Koefoed, H. David McIntyre, Kristen S. Gibbons, Charlotte W. Poulsen, Jens Fuglsang, Per G. Ovesen
Reproductive Medicine.2023; 4(3): 133. CrossRef
Prepregnancy Glucose Levels Within Normal Range and Its Impact on Obstetric Complications in Subsequent Pregnancy: A Population Cohort Study
Ho Yeon Kim, Ki Hoon Ahn, Geum Joon Cho, Soon-Cheol Hong, Min-Jeong Oh, Hai-Joong Kim
Journal of Korean Medical Science.2023;[Epub] CrossRef
Risk of Cause-Specific Mortality across Glucose Spectrum in Elderly People: A Nationwide Population-Based Cohort Study
Joonyub Lee, Hun-Sung Kim, Kee-Ho Song, Soon Jib Yoo, Kyungdo Han, Seung-Hwan Lee
Endocrinology and Metabolism.2023; 38(5): 525. CrossRef
The CHANGED Score—A New Tool for the Prediction of Insulin Dependency in Gestational Diabetes
Paul Rostin, Selina Balke, Dorota Sroka, Laura Fangmann, Petra Weid, Wolfgang Henrich, Josefine Theresia Königbauer
Journal of Clinical Medicine.2023; 12(22): 7169. CrossRef

Review Article

Diabetes, Obesity and Metabolism Big Data Articles (National Health Insurance Service Database)
Big Data Research in the Field of Endocrine Diseases Using the Korean National Health Information Database: Sun Wook Cho, Jung Hee Kim, Han Seok Choi, Hwa Young Ahn, Mee Kyoung Kim, Eun Jung Rhee; Endocrinol Metab. 2023;38(1):10-24. Published online February 9, 2023; DOI: https://doi.org/10.3803/EnM.2023.102

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Abstract PDF Supplementary Material PubReader ePub

The Korean National Health Information Database (NHID) contains big data combining information obtained from the National Health Insurance Service and health examinations. Data are provided in the form of a cohort, and the NHID can be used to conduct longitudinal studies and research on rare diseases. Moreover, data on the cause and date of death are provided by Statistics Korea. Research and publications based on the NHID have increased explosively in the field of endocrine disorders. However, because the data were not collected for research purposes, studies using the NHID have limitations, particularly the need for the operational definition of diseases. In this review, we describe the characteristics of the Korean NHID, operational definitions of endocrine diseases used for research, and an overview of recent studies in endocrinology using the Korean NHID.

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