Endocrinology and Metabolism

Original Articles

Diabetes, obesity and metabolism
Plasma C-Peptide Levels and the Continuous Glucose Monitoring-Defined Coefficient of Variation in Risk Prediction for Hypoglycemia in Korean People with Diabetes Having Normal and Impaired Kidney Function: So Yoon Kwon, Jiyun Park, So Hee Park, You-Bin Lee, Gyuri Kim, Kyu Yeon Hur, Jae Hyeon Kim, Sang-Man Jin; Endocrinol Metab. 2025;40(2):268-277. Published online February 27, 2025; DOI: https://doi.org/10.3803/EnM.2024.2083

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Background
We aimed to investigate the predictive values of plasma C-peptide levels and the continuous glucose monitoring (CGM)-defined coefficient of variation (CV) in risk prediction for hypoglycemia in Korean people with diabetes with normal and impaired kidney function.
Methods
We analyzed data from 1,185 participants diagnosed with type 1 and type 2 diabetes who underwent blinded professional CGM between January 2009 and May 2021 at outpatient clinics. We explored correlations among CGM-defined CV, plasma C-peptide levels, and time below range at <70 and 54 mg/dL across different kidney function categories.
Results
In patients with chronic kidney disease (CKD) stages 1–2 (n=934), 89.3% who had a random plasma C-peptide level higher than 600 pmol/L exhibited a CV of ≤36%. Among those in CKD stage 3 (n=161) with a random plasma C-peptide level exceeding 600 pmol/L, 66.7% showed a CV of ≤36%. In stages 4–5 of CKD (n=90), the correlation between random C-peptide levels and CV was not significant (r=–0.05, P=0.640), including cases with a CV greater than 36% despite very high random plasma C-peptide levels. Random plasma C-peptide levels and CGM-assessed CV significantly predicted hypoglycemia in CKD stages 1–2 and 1–5, respectively.
Conclusion
The established C-peptide criteria in Western populations are applicable to Korean people with diabetes for hypoglycemic risk prediction, unless kidney function is impaired equivalent to CKD stage 3–5. The CGM-defined CV is informative for hypoglycemic risk prediction regardless of kidney function.

Citations

Citations to this article as recorded by

Continuous glucose monitoring in high-risk individuals
Zhiyue Chen, Yinbei Zhang, Lin Sun, Weiying Guo
Clinica Chimica Acta.2026; 580: 120733. CrossRef
The evolution of C-peptide's role in diabetes care
Laura Briggs, Alexander Read, Sarah Darch, Emma L. Williams, Wann Jia Loh, Julia S. Kenkre
Current Opinion in Endocrinology, Diabetes & Obesity.2026; 33(1): 16. CrossRef
Plasma C-Peptide Level and Continuous Glucose Monitoring-Derived Coefficient of Variation as a Predictable Risk Factor for Hypoglycemia in Koreans with Diabetes
Seung-Hyun Ko
Endocrinology and Metabolism.2025; 40(2): 198. CrossRef
Beneficial Role of Increased Glucose Infusion in Decompensated Type 2 Diabetes Patient
Marie Ticha, Ondrej Sobotka, Pavel Skorepa, Lubos Sobotka
Diabetology.2025; 6(6): 47. CrossRef

Diabetes, obesity and metabolism Big Data Articles (National Health Insurance Service Database)
Time to Insulin Therapy and Severe Hypoglycemia in Korean Adults Initially Diagnosed with Type 2 Diabetes: A Nationwide Study: You-Bin Lee, Kyungdo Han, Bongsung Kim, So Hee Park, Kyu Yeon Hur, Gyuri Kim, Jae Hyeon Kim, Sang-Man Jin; Endocrinol Metab. 2025;40(3):421-433. Published online February 4, 2025; DOI: https://doi.org/10.3803/EnM.2024.2082

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Abstract PDF Supplementary Material PubReader ePub: Background
We examined the distribution of time to insulin therapy (TIT) post-diabetes diagnosis and the hazard of severe hypoglycemia (SH) according to TIT in Korean adults initially diagnosed with type 2 diabetes (T2D) and who progressed to insulin therapy.
Methods
Using data from the Korean National Health Insurance Service (2002 to 2018), we selected adult incident insulin users (initially diagnosed as T2D) who underwent health examinations between 2009 and 2012. The hazards of SH, recurrent SH, and problematic hypoglycemia were analyzed according to groups categorized using the TIT and clinical risk factors for SH (TIT ≥5 years with risk factors, TIT ≥5 years without risk factors, 3 ≤TIT <5 years, 1 ≤TIT <3 years, and TIT <1 year).
Results
Among 41,637 individuals, 14,840 (35.64%) and 10,587 (25.43%) initiated insulin therapy within <5 and <3 years postdiabetes diagnosis, respectively. During a median 6.53 years, 3,406 SH events occurred. Compared to individuals with TIT ≥5 years and no risk factor for SH, individuals with TIT <3 years had higher outcome hazards in a graded manner (adjusted hazard ratio [95% confidence intervals] for any SH: 1.117 [0.967 to 1.290] in those with 3 ≤TIT <5 years; 1.459 [1.284 to 1.657] in those with 1 ≤ TIT <3 years; and 1.515 [1.309 to 1.754] in those with TIT <1 year). This relationship was more pronounced in the non-obese subpopulation.
Conclusion
Among adults who progressed to insulin therapy after being diagnosed with T2D, a shorter TIT was not uncommon and may predict an increased risk of SH, particularly in non-obese patients.

Hypothalamus and pituitary gland
Clinical Characteristics, Diagnosis, and Treatment of Thyroid Stimulating Hormone-Secreting Pituitary Neuroendocrine Tumor (TSH PitNET): A Single-Center Experience: Jung Heo, Yeon-Lim Suh, Se Hoon Kim, Doo-Sik Kong, Do-Hyun Nam, Won-Jae Lee, Sung Tae Kim, Sang Duk Hong, Sujin Ryu, You-Bin Lee, Gyuri Kim, Sang-Man Jin, Jae Hyeon Kim, Kyu Yeon Hur; Endocrinol Metab. 2024;39(2):387-396. Published online February 5, 2024; DOI: https://doi.org/10.3803/EnM.2023.1877

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Background
Thyroid-stimulating hormone (TSH)-secreting pituitary neuroendocrine tumor (TSH PitNET) is a rare subtype of PitNET. We investigated the comprehensive characteristics and outcomes of TSH PitNET cases from a single medical center. Also, we compared diagnostic methods to determine which showed superior sensitivity.
Methods
A total of 17 patients diagnosed with TSH PitNET after surgery between 2002 and 2022 in Samsung Medical Center was retrospectively reviewed. Data on comprehensive characteristics and treatment outcomes were collected. The sensitivities of diagnostic methods were compared.
Results
Seven were male (41%), and the median age at diagnosis was 42 years (range, 21 to 65); the median follow-up duration was 37.4 months. The most common (59%) initial presentation was hyperthyroidism-related symptoms. Hormonal co-secretion was present in four (23%) patients. Elevated serum alpha-subunit (α-SU) showed the greatest diagnostic sensitivity (91%), followed by blunted response at thyrotropin-releasing hormone (TRH) stimulation (80%) and elevated sex hormone binding globulin (63%). Fourteen (82%) patients had macroadenoma, and a specimen of one patient with heavy calcification was negative for TSH. Among 15 patients who were followed up for more than 6 months, 10 (67%) achieved hormonal and structural remission within 6 months postoperatively. A case of growth hormone (GH)/TSH/prolactin (PRL) co-secreting mixed gangliocytoma-pituitary adenoma (MGPA) was discovered.
Conclusion
The majority of the TSH PitNET cases was macroadenoma, and 23% showed hormone co-secretion. A rare case of GH/TSH/PRL co-secreting MGPA was discovered. Serum α-SU and TRH stimulation tests showed great diagnostic sensitivity. Careful consideration is needed in diagnosing TSH PitNET. Achieving remission requires complete tumor resection. In case of nonremission, radiotherapy or medical therapy can improve the long-term remission rate.

Citations

Citations to this article as recorded by

Glucose metabolism in anterior pituitary adenomas
Valeria Hernández-Brito, Stephanie Lemoni Casco-Morales, Andrés Vega-Rosas
Clinica Chimica Acta.2026; 578: 120587. CrossRef
TSH-secreting pituitary adenomas and bone
Marco Losa, Alberto Vassallo, Stefano Frara, Pietro Mortini, Andrea Giustina
Pituitary.2024; 27(6): 752. CrossRef

Brief Report

Adrenal Gland
Aldosterone Immunoassay-Specific Cutoff Value for Seated Saline Suppression Test for Diagnosing Primary Aldosteronism: So Yoon Kwon, Jiyun Park, So Hee Park, So Hyun Cho, You-Bin Lee, Soo-Youn Lee, Jae Hyeon Kim; Endocrinol Metab. 2022;37(6):938-942. Published online December 6, 2022; DOI: https://doi.org/10.3803/EnM.2022.1535

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A seated saline loading test (SLT) using liquid chromatography-tandem mass spectrometry (LC-MS/MS) is one of the most accepted confirmatory tests of primary aldosteronism. However, LC-MS/MS is time-consuming and is not widely available in diagnostic laboratories compared to immunoassay. With immunoassay, it is unknown whether SLT in the seated position is more accurate than that of the supine position, and a cutoff value of post-seated SLT plasma aldosterone concentration (PAC) must be established in the Korean population. Ninety-eight patients underwent SLT in both positions, and post-SLT PAC was measured by LC-MS/MS and radioimmunoassay. We confirmed primary aldosteronism if post-seated SLT PAC by LC-MS/MS exceeded 5.8 ng/dL. The area under the receiver operating characteristic curve was greater for seated than supine SLT (0.928 vs. 0.834, P=0.003). The optimal cutoff value of post-seated SLT by radioimmunoassay was 6.6 ng/dL (sensitivity 83.3%, specificity 92.2%).

Citations

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Investigating the cut-off values of captopril challenge test for primary aldosteronism using the novel chemiluminescent enzyme immunoassay method: a retrospective cohort study
Yuta Tezuka, Kei Omata, Yoshikiyo Ono, Kengo Kambara, Hiroki Kamada, Sota Oguro, Yuto Yamazaki, Celso E. Gomez-Sanchez, Akihiro Ito, Hironobu Sasano, Kei Takase, Tetsuhiro Tanaka, Hideki Katagiri, Fumitoshi Satoh
Hypertension Research.2024; 47(5): 1362. CrossRef
Usefulness of the Upright Posture Test in the Diagnosis of Primary Aldosteronism
Nada Younes, Matthieu St-Jean, Marie-Josée Desrochers, Eric Therasse, Mathieu Latour, Isabelle Bourdeau, André Lacroix
Journal of the Endocrine Society.2024;[Epub] CrossRef
Screening and treatment of endocrine hypertension focusing on adrenal gland disorders: a narrative review
Seung Min Chung
Journal of Yeungnam Medical Science.2024; 41(4): 269. CrossRef
Comparative Analysis of Liquid Chromatography-Tandem Mass Spectrometry and Radioimmunoassay in Determining Plasma Aldosterone Concentration and Plasma Renin Activity for Primary Aldosteronism Screening
So Yoon Kwon, Kyeong-Jin Kim, Soo-Youn Lee, Jae Hyeon Kim
Endocrinology and Metabolism.2024; 39(6): 965. CrossRef

Special Article

Adrenal gland
Diagnosis for Pheochromocytoma and Paraganglioma: A Joint Position Statement of the Korean Pheochromocytoma and Paraganglioma Task Force: Eu Jeong Ku, Kyoung Jin Kim, Jung Hee Kim, Mi Kyung Kim, Chang Ho Ahn, Kyung Ae Lee, Seung Hun Lee, You-Bin Lee, Kyeong Hye Park, Yun Mi Choi, Namki Hong, A Ram Hong, Sang-Wook Kang, Byung Kwan Park, Moon-Woo Seong, Myungshin Kim, Kyeong Cheon Jung, Chan Kwon Jung, Young Seok Cho, Jin Chul Paeng, Jae Hyeon Kim, Ohk-Hyun Ryu, Yumie Rhee, Chong Hwa Kim, Eun Jig Lee; Endocrinol Metab. 2021;36(2):322-338. Published online April 6, 2021; DOI: https://doi.org/10.3803/EnM.2020.908

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Pheochromocytoma and paraganglioma (PPGLs) are rare catecholamine-secreting neuroendocrine tumors but can be life-threatening. Although most PPGLs are benign, approximately 10% have metastatic potential. Approximately 40% cases are reported as harboring germline mutations. Therefore, timely and accurate diagnosis of PPGLs is crucial. For more than 130 years, clinical, molecular, biochemical, radiological, and pathological investigations have been rapidly advanced in the field of PPGLs. However, performing diagnostic studies to localize lesions and detect metastatic potential can be still challenging and complicated. Furthermore, great progress on genetics has shifted the paradigm of genetic testing of PPGLs. The Korean PPGL task force team consisting of the Korean Endocrine Society, the Korean Surgical Society, the Korean Society of Nuclear Medicine, the Korean Society of Pathologists, and the Korean Society of Laboratory Medicine has developed this position statement focusing on the comprehensive and updated diagnosis for PPGLs.

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Nicola Rotolo, Giorgia Cerretani, Sabrina Casagrande, Elisa Nardecchia, Elena Asteggiano, Alberto Colombo, Luca Filipponi, Filippo Piacentino, Schiorlin Ilaria, Federico Fontana
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Successful Laparoscopic Resection of a Giant Para-aortic Pheochromocytoma: A Case Report
Loay Ghalyoun, Diya E Viju, Khadiga Abdelmonem, Fahed S Khdrawe, Joaquin Picazo-Yeste
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Young-Wook Kim
Vascular Specialist International.2025;[Epub] CrossRef
PHEOCHROMOCYTOMA AND PARAGANGLIOMA: CLINICAL PICTURE, DIAGNOSIS, TREATMENT, FOLLOW-UP AND PROGNOSIS - A LITERATURE REVIEW
Dominika Żyła, Kornelia Rojek, Andrzej Zuzak, Katarzyna Zych, Sylwia Koziej, Adam Jakubas, Mateusz Korga, Milena Krawczyk
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Seung Shin Park, Chang Ho Ahn, Seunghoo Lee, Woochang Lee, Won Woong Kim, Yu‐Mi Lee, Su Jin Kim, Tae‐Yon Sung, Kyu Eun Lee, Jung Hee Kim, Seung Hun Lee, Jung‐Min Koh
Journal of Internal Medicine.2024; 296(1): 68. CrossRef
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Kwan Hoon Jo, Jaewoong Lee, Jaeeun Yoo, Hoon Seok Kim, Eun Sook Kim, Je Ho Han, Yi Sun Jang, Jae-Seung Yun, Jang Won Son, Soon Jib Yoo, Seung Hwan Lee, Dong Jun Lim, Hyuk-Sang Kwon, Seungok Lee, Sungdae Moon, Myungshin Kim
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Romolo M. DORIZZI, Vincenzo BRESCIA, Marina VITILLO, Ottavia PORZIO, Federica D’AURIZIO
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Meditsinskiy sovet = Medical Council.2024; (16): 206. CrossRef
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Naoki Okada, Akihiro Shioya, Sumihito Togi, Hiroki Ura, Yo Niida
Cureus.2023;[Epub] CrossRef
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Case Report

Adrenal gland
Bilateral Adrenocortical Masses Producing Aldosterone and Cortisol Independently: Seung-Eun Lee, Jae Hyeon Kim, You-Bin Lee, Hyeri Seok, In Seub Shin, Yeong Hee Eun, Jung-Han Kim, Young Lyun Oh; Endocrinol Metab. 2015;30(4):607-613. Published online December 31, 2015; DOI: https://doi.org/10.3803/EnM.2015.30.4.607

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A 31-year-old woman was referred to our hospital with symptoms of hypertension and bilateral adrenocortical masses with no feature of Cushing syndrome. The serum aldosterone/renin ratio was elevated and the saline loading test showed no suppression of the plasma aldosterone level, consistent with a diagnosis of primary hyperaldosteronism. Overnight and low-dose dexamethasone suppression tests showed no suppression of serum cortisol, indicating a secondary diagnosis of subclinical Cushing syndrome. Adrenal vein sampling during the low-dose dexamethasone suppression test demonstrated excess secretion of cortisol from the left adrenal mass. A partial right adrenalectomy was performed, resulting in normalization of blood pressure, hypokalemia, and high aldosterone level, implying that the right adrenal mass was the main cause of the hyperaldosteronism. A total adrenalectomy for the left adrenal mass was later performed, resulting in a normalization of cortisol level. The final diagnosis was bilateral adrenocortical adenomas, which were secreting aldosterone and cortisol independently. This case is the first report of a concurrent cortisol-producing left adrenal adenoma and an aldosterone-producing right adrenal adenoma in Korea, as demonstrated by adrenal vein sampling and sequential removal of adrenal masses.

Citations

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Bilateral adrenal adenomas with autonomous cortisol secretion from both glands and autonomous aldosterone secretion from the left adrenal: a case report
Jung Eun Han, Soyeon Yoo, Sang Ah Lee, Gwanpyo Koh
Journal of Yeungnam Medical Science.2025; 42: 33. CrossRef
Problems of diagnosis and treatment of Connshing syndrome
M. S. Annaev, B. I. Geltser, K. V. Stegniy, O. I. Pak, R. A. Goncharuk, S. M. Selyutin, A. M. Morozova, O. G. Tsygankova, E. V. Maslyantsev, V. G. Fisenko
Clinical Medicine (Russian Journal).2024; 102(4): 367. CrossRef
Different cell compositions and a novel somatic KCNJ5 variant found in a patient with bilateral adrenocortical adenomas secreting aldosterone and cortisol
Liling Zhao, Jinjing Wan, Yujun Wang, Wenjun Yang, Qi Liang, Jinrong Wang, Ping Jin
Frontiers in Endocrinology.2023;[Epub] CrossRef
Adrenal Vein Cortisol to Metanephrine Ratio for Localizing ACTH-Independent Cortisol-Producing Adenoma: A Case Report
Rishi Raj, Philip A Kern, Neelima Ghanta, Edilfavia M Uy, Kamyar Asadipooya
Journal of the Endocrine Society.2021;[Epub] CrossRef
Adrenal Venous Sampling for Subtype Diagnosis of Primary Hyperaldosteronism
Mitsuhide Naruse, Akiyo Tanabe, Koichi Yamamoto, Hiromi Rakugi, Mitsuhiro Kometani, Takashi Yoneda, Hiroki Kobayashi, Masanori Abe, Youichi Ohno, Nobuya Inagaki, Shoichiro Izawa, Masakatsu Sone
Endocrinology and Metabolism.2021; 36(5): 965. CrossRef
Hypercortisolism and primary aldosteronism caused by bilateral adrenocortical adenomas: a case report
Kaiyun Ren, Jia Wei, Qilin Liu, Yuchun Zhu, Nianwei Wu, Ying Tang, Qianrui Li, Qianying Zhang, Yerong Yu, Zhenmei An, Jing Chen, Jianwei Li
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