Endocrinology and Metabolism

Original Article

Diabetes, obesity and metabolism
Efficacy and Safety of Stage 5 Connected Insulin Pens in Type 1 or Type 2 Diabetes: Randomized Controlled Trial Protocol (SMART-5 Study): Ji Yoon Kim, Nam Hoon Kim, Soo Heon Kwak, Chang Hee Jung, Eun Seok Kang, Jun Sung Moon, Sun Joon Moon, So Yoon Kwon, Jee Hee Yoo, Younghoon Kim, Tae-min Lee, Chung-il Yang, Jae Hyeon Kim, Sang-Man Jin; Endocrinol Metab. 2026;41(3):393-404. Published online December 12, 2025; DOI: https://doi.org/10.3803/EnM.2025.2579

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Abstract PDF PubReader ePub: Background
Stage 2 or 3 connected insulin pens (CIPs) refer to tracking insulin pens that are capable of transmitting insulin dose data via cloud connectivity. Stage 4 CIPs feature a bolus calculator that determines appropriate insulin doses based on real-time continuous glucose monitoring (CGM) data, carbohydrate intake, previous dosing history, and preset parameters. Stage 5 CIPs additionally offer advanced decision-support features, such as education modules and coaching. However, the efficacy and safety of stage 5 CIPs have not yet been established.
Methods
In this prospective, open-label, parallel-group, multicenter, randomized controlled trial, we will include adults aged ≥19 and <75 years with type 1 or type 2 diabetes receiving multiple daily insulin injections (MDI) and having glycosylated hemoglobin (HbA1c) levels of 7.5% to 12.0%. In total, 152 participants will be randomized in a 1:1 ratio to receive either stage 5 CIPs with CGM or tracking insulin pens with CGM. Stage 5 CIPs include a Setup Wizard that recommends individualized initial settings and an algorithm that provides advanced insulin dosing guidance based on analyses of each participant’s CGM and insulin injection data. The primary outcome will be the change in HbA1c levels from baseline to week 12 (ClinicalTrials.gov, NCT07004153).
Conclusion
This trial (Stage 5 connected insulin pen for MDI with Advanced decision support in a Randomized Trial [SMART-5 Study]) will determine whether stage 5 CIPs are superior to tracking insulin pens in improving glycemic control among adults with type 1 or type 2 diabetes treated with MDI. Overall, this study may offer a promising strategy for enhancing the management and outcomes of patients with diabetes.

Review Article

Diabetes, obesity and metabolism
Advances in Continuous Glucose Monitoring: Clinical Applications: So Yoon Kwon, Jun Sung Moon; Endocrinol Metab. 2025;40(2):161-173. Published online April 8, 2025; DOI: https://doi.org/10.3803/EnM.2025.2370

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Continuous glucose monitoring (CGM) has revolutionized diabetes management, significantly enhancing glycemic control across diverse patient populations. Recent evidence supports its effectiveness in both type 1 and type 2 diabetes management, with benefits extending beyond traditional glucose monitoring approaches. CGM has demonstrated substantial improvements in glycemic control across multiple metrics. Studies report consistent glycosylated hemoglobin reductions of 0.25%–3.0% and notable time in range improvements of 15%–34%. CGM effectively reduces hypoglycemic events, with studies reporting significant reductions in time spent in hypoglycemia. CGM also serves as an educational tool for lifestyle modification, providing real-time feedback that helps patients understand how diet and physical activity affect glucose levels. While skin-related complications remain a concern, technological advancements have addressed many initial concerns. High satisfaction rates and long-term use suggest that device-related issues are manageable with proper education and support. Despite high initial costs, CGM’s prevention of complications and hospitalizations ultimately reduces healthcare expenditures. With appropriate training and support, CGM represents a transformative technology for comprehensive diabetes care.

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Original Article

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

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Zhiyue Chen, Yinbei Zhang, Lin Sun, Weiying Guo
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Soojin Park, So Hyun Cho, Seohyun Kim, Sang Ho Park, Ji Yoon Kim, Rosa Oh, Myunghwa Jang, You-Bin Lee, Gyuri Kim, Kyu Yeon Hur, Jae Hyeon Kim, Sang-Man Jin
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Plasma C-Peptide Level and Continuous Glucose Monitoring-Derived Coefficient of Variation as a Predictable Risk Factor for Hypoglycemia in Koreans with Diabetes
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Brief Reports

Adrenal gland
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; Endocrinol Metab. 2024;39(6):965-969. Published online November 15, 2024; DOI: https://doi.org/10.3803/EnM.2024.1985

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Liquid chromatography-tandem mass spectrometry (LC-MS/MS) accurately measures plasma aldosterone concentration (PAC), but its correlation with radioimmunoassay (RIA), equivalent RIA levels, and optimal cutoff for PAC and aldosterone-to-renin ratio (ARR) in primary aldosteronism (PA) screening have not been determined in a Korean population. Our study of 127 patients who underwent diagnostic testing for PA showed that the LC-MS/MS and RIA methods have good correlation, with a mean bias of 29.3% for PAC. An LC-MS/MS PAC level of 11.7 ng/dL was equivalent to an RIA PAC level of 15 ng/dL. Receiver operating characteristic curve analysis showed that an LC-MS/MS PAC level of 10.3 ng/dL and LC-MS/MS ARR level of 20.0 provided sensitivity of 73.1% with a specificity of 57.3% and sensitivity of 92.3% with a specificity of 14.7%, respectively. When the LC-MS/MS method is used for PA screening, an adjustment of cutoff values is necessary.

Citations

Citations to this article as recorded by

Magnetic bead-assisted extraction combined with LC–MS/MS for simultaneous quantification of aldosterone and related steroids in human plasma
Yudong Chu, Qin Su, Ziyuan Huang, Chenyi Yuan, Shazhou Ye, Xueyan Bian
Analytical and Bioanalytical Chemistry.2026; 418(1): 343. CrossRef

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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