Endocrinology and Metabolism

Original Articles

Comparison of the Effectiveness and Hypocalcemia Risk of Antiresorptive Agents in Patients with Hypercalcemia of Malignancy: Sung Hye Kong, Seung Shin Park, Jung Hee Kim, Sang Wan Kim, Se Hyun Kim, Jee Hyun Kim, Chan Soo Shin; Received August 2, 2024 Accepted October 29, 2024 Published online February 4, 2025; DOI: https://doi.org/10.3803/EnM.2024.2132 [Epub ahead of print]

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Abstract PDF Supplementary Material PubReader ePub: Background
Hypercalcemia of malignancy (HCM), a major metabolic complication of cancer, is often managed with bisphosphonates (BP) and, increasingly, with denosumab. We aimed to compare the effectiveness and safety of denosumab with that of BP, with or without calcitonin, in treating HCM.
Methods
This retrospective cohort study was conducted at a tertiary hospital from 2017 to 2022 and included 317 patients treated for HCM. Participants were divided into three treatment groups: denosumab, intravenous (IV) BP only, and IV BP combined with calcitonin. The primary outcomes measured were changes in calcium levels and the incidence of hypocalcemia. Analysis of covariance was used to adjust for age, sex, body mass index, creatinine level, type of malignancy, and the use of furosemide and steroids.
Results
The mean participant age was 65 years, and 37.5% were female. After adjustment, both denosumab and IV BPs were found to effectively lower calcium levels. Denosumab led to a decrease of 2.0 mg/dL (−15.9%), while IV BP alone resulted in a reduction of 1.8 mg/dL (−13.9%). The largest reduction, of 2.7 mg/dL (−20.9%), occurred with IV BP and calcitonin. Both denosumab and IV BP+calcitonin yielded their lowest calcium levels within 48 hours, whereas the IV BP only group reached a nadir within 72 hours. Despite these differences in treatment effectiveness, hypocalcemia occurred significantly less frequently in the denosumab group compared to the other groups.
Conclusion
Denosumab and IV BP were similarly effective in reducing calcium levels. However, IV BP combined with calcitonin yielded a more rapid and pronounced decrease.

Calcium & bone metabolism
Protein Signatures of Parathyroid Adenoma according to Tumor Volume and Functionality: Sung Hye Kong, Jeong Mo Bae, Jung Hee Kim, Sang Wan Kim, Dohyun Han, Chan Soo Shin; Endocrinol Metab. 2024;39(2):375-386. Published online March 21, 2024; DOI: https://doi.org/10.3803/EnM.2023.1827

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Parathyroid adenoma (PA) is a common endocrine disease linked to multiple complications, but the pathophysiology of the disease remains incompletely understood. The study aimed to identify the key regulator proteins and pathways of PA according to functionality and volume through quantitative proteomic analyses.
Methods
We conducted a retrospective study of 15 formalin-fixed, paraffin-embedded PA samples from tertiary hospitals in South Korea. Proteins were extracted, digested, and the resulting peptides were analyzed using liquid chromatography-tandem mass spectrometry. Pearson correlation analysis was employed to identify proteins significantly correlated with clinical variables. Canonical pathways and transcription factors were analyzed using Ingenuity Pathway Analysis.
Results
The median age of the participants was 52 years, and 60.0% were female. Among the 8,153 protein groups analyzed, 496 showed significant positive correlations with adenoma volume, while 431 proteins were significantly correlated with parathyroid hormone (PTH) levels. The proteins SLC12A9, LGALS3, and CARM1 were positively correlated with adenoma volume, while HSP90AB2P, HLA-DRA, and SCD5 showed negative correlations. DCPS, IRF2BPL, and FAM98A were the main proteins that exhibited positive correlations with PTH levels, and SLITRK4, LAP3, and AP4E1 had negative correlations. Canonical pathway analysis demonstrated that the RAN and sirtuin signaling pathways were positively correlated with both PTH levels and adenoma volume, while epithelial adherence junction pathways had negative correlations.
Conclusion
Our study identified pivotal proteins and pathways associated with PA, offering potential therapeutic targets. These findings accentuate the importance of proteomics in understanding disease pathophysiology and the need for further research.

Calcium & Bone Metabolism
Development of a Spine X-Ray-Based Fracture Prediction Model Using a Deep Learning Algorithm: Sung Hye Kong, Jae-Won Lee, Byeong Uk Bae, Jin Kyeong Sung, Kyu Hwan Jung, Jung Hee Kim, Chan Soo Shin; Endocrinol Metab. 2022;37(4):674-683. Published online August 5, 2022; DOI: https://doi.org/10.3803/EnM.2022.1461

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Background
Since image-based fracture prediction models using deep learning are lacking, we aimed to develop an X-ray-based fracture prediction model using deep learning with longitudinal data.
Methods
This study included 1,595 participants aged 50 to 75 years with at least two lumbosacral radiographs without baseline fractures from 2010 to 2015 at Seoul National University Hospital. Positive and negative cases were defined according to whether vertebral fractures developed during follow-up. The cases were divided into training (n=1,416) and test (n=179) sets. A convolutional neural network (CNN)-based prediction algorithm, DeepSurv, was trained with images and baseline clinical information (age, sex, body mass index, glucocorticoid use, and secondary osteoporosis). The concordance index (C-index) was used to compare performance between DeepSurv and the Fracture Risk Assessment Tool (FRAX) and Cox proportional hazard (CoxPH) models.
Results
Of the total participants, 1,188 (74.4%) were women, and the mean age was 60.5 years. During a mean follow-up period of 40.7 months, vertebral fractures occurred in 7.5% (120/1,595) of participants. In the test set, when DeepSurv learned with images and clinical features, it showed higher performance than FRAX and CoxPH in terms of C-index values (DeepSurv, 0.612; 95% confidence interval [CI], 0.571 to 0.653; FRAX, 0.547; CoxPH, 0.594; 95% CI, 0.552 to 0.555). Notably, the DeepSurv method without clinical features had a higher C-index (0.614; 95% CI, 0.572 to 0.656) than that of FRAX in women.
Conclusion
DeepSurv, a CNN-based prediction algorithm using baseline image and clinical information, outperformed the FRAX and CoxPH models in predicting osteoporotic fracture from spine radiographs in a longitudinal cohort.

Citations

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A CT-based Deep Learning Model for Predicting Subsequent Fracture Risk in Patients with Hip Fracture
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A Computed Tomography–Based Fracture Prediction Model With Images of Vertebral Bones and Muscles by Employing Deep Learning: Development and Validation Study
Sung Hye Kong, Wonwoo Cho, Sung Bae Park, Jaegul Choo, Jung Hee Kim, Sang Wan Kim, Chan Soo Shin
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Srinivasa Rao Gadu, Chandra Sekhar Potala
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Jeonghoon Ha
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Calcium & Bone Metabolism
Effect of Vitamin D Supplementation on Risk of Fractures and Falls According to Dosage and Interval: A Meta-Analysis: Sung Hye Kong, Han Na Jang, Jung Hee Kim, Sang Wan Kim, Chan Soo Shin; Endocrinol Metab. 2022;37(2):344-358. Published online April 25, 2022; DOI: https://doi.org/10.3803/EnM.2021.1374

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Background
Although recent studies comparing various dosages and intervals of vitamin D supplementation have been published, it is yet to be elucidated whether there is an appropriate dose or interval to provide benefit regarding fracture risk. We aimed to assess the published evidence available to date regarding the putative beneficial effects of vitamin D supplements on fractures and falls according to various dosages and intervals.
Methods
We performed a meta-analysis of randomized controlled studies reporting associations between vitamin D supplementation and the risks of fractures and falls in PubMed, EMBASE, and Cochrane library. Studies with supplements of ergocalciferol or calcitriol, those with a number of event ≤10, or those with a follow-up duration of less than 6 months were also excluded.
Results
Thirty-two studies were included in the final analysis. Vitamin D supplementation with daily dose of 800 to 1,000 mg was associated with lower risks of osteoporotic fracture and fall (pooled relative risk [RR], 0.87; 95% confidence interval [CI], 0.78 to 0.97 and RR, 0.91; 95% CI, 0.85 to 0.98), while studies with <800 or >1,000 mg/day did not. Also, among intervals, daily administration of vitamin D was associated with the reduced risk of falls, while intermittent dose was not. Also, patients with vitamin D deficiency showed a significant risk reduction of falls after vitamin D supplementation.
Conclusion
Daily vitamin D dose of 800 to 1,000 IU was the most probable way to reduce the fracture and fall risk. Further studies designed with various regimens and targeted vitamin D levels are required to elucidate the benefits of vitamin D supplements.

Citations

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Ukrainian Consensus on Diagnosis and Management of Vitamin D Deficiency in Adults
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Adrenal Gland
Outcome-Based Decision-Making Algorithm for Treating Patients with Primary Aldosteronism: Jung Hee Kim, Chang Ho Ahn, Su Jin Kim, Kyu Eun Lee, Jong Woo Kim, Hyun-Ki Yoon, Yu-Mi Lee, Tae-Yon Sung, Sang Wan Kim, Chan Soo Shin, Jung-Min Koh, Seung Hun Lee; Endocrinol Metab. 2022;37(2):369-382. Published online April 14, 2022; DOI: https://doi.org/10.3803/EnM.2022.1391

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Background
Optimal management of primary aldosteronism (PA) is crucial due to the increased risk of cardiovascular and cerebrovascular diseases. Adrenal venous sampling (AVS) is the gold standard method for determining subtype but is technically challenging and invasive. Some PA patients do not benefit clinically from surgery. We sought to develop an algorithm to improve decision- making before engaging in AVS and surgery in clinical practice.
Methods
We conducted the ongoing Korean Primary Aldosteronism Study at two tertiary centers. Study A involved PA patients with successful catheterization and a unilateral nodule on computed tomography and aimed to predict unilateral aldosterone-producing adenoma (n=367). Study B involved similar patients who underwent adrenalectomy and aimed to predict postoperative outcome (n=330). In study A, we implemented important feature selection using the least absolute shrinkage and selection operator regression.
Results
We developed a unilateral PA prediction model using logistic regression analysis: lowest serum potassium level ≤3.4 mEq/L, aldosterone-to-renin ratio ≥150, plasma aldosterone concentration ≥30 ng/mL, and body mass index <25 kg/m2 (area under the curve, 0.819; 95% confidence interval, 0.774 to 0.865; sensitivity, 97.6%; specificity, 25.5%). In study B, we identified female, hypertension duration <5 years, anti-hypertension medication <2.5 daily defined dose, and the absence of coronary artery disease as predictors of clinical success, using stepwise logistic regression models (sensitivity, 94.2%; specificity, 49.3%). We validated our algorithm in the independent validation dataset (n=53).
Conclusion
We propose this new outcome-driven diagnostic algorithm, simultaneously considering unilateral aldosterone excess and clinical surgical benefits in PA patients.

Citations

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Outcomes after medical treatment for primary aldosteronism: an international consensus and analysis of treatment response in an international cohort
Jun Yang, Jacopo Burrello, Jessica Goi, Martin Reincke, Christian Adolf, Evelyn Asbach, Denise Brűdgam, Qifu Li, Ying Song, Jinbo Hu, Shumin Yang, Fumitoshi Satoh, Yoshikiyo Ono, Renata Libianto, Michael Stowasser, Nanfang Li, Qing Zhu, Namki Hong, Drishy
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Subtype-specific Body Composition and Metabolic Risk in Patients With Primary Aldosteronism
Seung Shin Park, Chang Ho Ahn, Sang Wan Kim, Ji Won Yoon, Jung Hee Kim
The Journal of Clinical Endocrinology & Metabolism.2024; 109(2): e788. CrossRef
Correlation of Histopathologic Subtypes of Primary Aldosteronism with Clinical Phenotypes and Postsurgical Outcomes
Chang Ho Ahn, You-Bin Lee, Jae Hyeon Kim, Young Lyun Oh, Jung Hee Kim, Kyeong Cheon Jung
The Journal of Clinical Endocrinology & Metabolism.2024; 109(8): e1582. CrossRef
Predicting the resolution of hypertension following adrenalectomy in primary aldosteronism: Controversies and unresolved issues a narrative review
Luigi Marzano
Langenbeck's Archives of Surgery.2024;[Epub] CrossRef
Prognostic models to predict complete resolution of hypertension after adrenalectomy in primary aldosteronism: A systematic review and meta‐analysis
Luigi Marzano, Amir Kazory, Faeq Husain‐Syed, Claudio Ronco
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2023 Korean Endocrine Society Consensus Guidelines for the Diagnosis and Management of Primary Aldosteronism
Jeonghoon Ha, Jung Hwan Park, Kyoung Jin Kim, Jung Hee Kim, Kyong Yeun Jung, Jeongmin Lee, Jong Han Choi, Seung Hun Lee, Namki Hong, Jung Soo Lim, Byung Kwan Park, Jung-Han Kim, Kyeong Cheon Jung, Jooyoung Cho, Mi-kyung Kim, Choon Hee Chung
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Calcium & Bone Metabolism
Unveiling Genetic Variants Underlying Vitamin D Deficiency in Multiple Korean Cohorts by a Genome-Wide Association Study: Ye An Kim, Ji Won Yoon, Young Lee, Hyuk Jin Choi, Jae Won Yun, Eunsin Bae, Seung-Hyun Kwon, So Eun Ahn, Ah-Ra Do, Heejin Jin, Sungho Won, Do Joon Park, Chan Soo Shin, Je Hyun Seo; Endocrinol Metab. 2021;36(6):1189-1200. Published online December 2, 2021; DOI: https://doi.org/10.3803/EnM.2021.1241

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Background
Epidemiological data have shown that vitamin D deficiency is highly prevalent in Korea. Genetic factors influencing vitamin D deficiency in humans have been studied in Europe but are less known in East Asian countries, including Korea. We aimed to investigate the genetic factors related to vitamin D levels in Korean people using a genome-wide association study (GWAS).
Methods
We included 12,642 subjects from three different genetic cohorts consisting of Korean participants. The GWAS was performed on 7,590 individuals using linear or logistic regression meta- and mega-analyses. After identifying significant single nucleotide polymorphisms (SNPs), we calculated heritability and performed replication and rare variant analyses. In addition, expression quantitative trait locus (eQTL) analysis for significant SNPs was performed.
Results
rs12803256, in the actin epsilon 1, pseudogene (ACTE1P) gene, was identified as a novel polymorphism associated with vitamin D deficiency. SNPs, such as rs11723621 and rs7041, in the group-specific component gene (GC) and rs11023332 in the phosphodiesterase 3B (PDE3B) gene were significantly associated with vitamin D deficiency in both meta- and mega-analyses. The SNP heritability of the vitamin D concentration was estimated to be 7.23%. eQTL analysis for rs12803256 for the genes related to vitamin D metabolism, including glutamine-dependent NAD(+) synthetase (NADSYN1) and 7-dehydrocholesterol reductase (DHCR7), showed significantly different expression according to alleles.
Conclusion
The genetic factors underlying vitamin D deficiency in Korea included polymorphisms in the GC, PDE3B, NADSYN1, and ACTE1P genes. The biological mechanism of a non-coding SNP (rs12803256) for DHCR7/NADSYN1 on vitamin D concentrations is unclear, warranting further investigations.

Citations

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Implications of vitamin D deficiency in systemic inflammation and cardiovascular health
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Corrigendum

Miscellaneous
Corrigendum: Correction of Acknowledgments. Transformation of Mature Osteoblasts into Bone Lining Cells and RNA Sequencing-Based Transcriptome Profiling of Mouse Bone during Mechanical Unloading: A Ram Hong, Kwangsoo Kim, Ji Yeon Lee, Jae-Yeon Yang, Jung Hee Kim, Chan Soo Shin, Sang Wan Kim; Endocrinol Metab. 2021;36(6):1314. Published online November 18, 2021; DOI: https://doi.org/10.3803/EnM.2021.601; Corrects: Endocrinol Metab 2020;35(2):456

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Review Article

Calcium & Bone Metabolism
Applications of Machine Learning in Bone and Mineral Research: Sung Hye Kong, Chan Soo Shin; Endocrinol Metab. 2021;36(5):928-937. Published online October 21, 2021; DOI: https://doi.org/10.3803/EnM.2021.1111

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In this unprecedented era of the overwhelming volume of medical data, machine learning can be a promising tool that may shed light on an individualized approach and a better understanding of the disease in the field of osteoporosis research, similar to that in other research fields. This review aimed to provide an overview of the latest studies using machine learning to address issues, mainly focusing on osteoporosis and fractures. Machine learning models for diagnosing and classifying osteoporosis and detecting fractures from images have shown promising performance. Fracture risk prediction is another promising field of research, and studies are being conducted using various data sources. However, these approaches may be biased due to the nature of the techniques or the quality of the data. Therefore, more studies based on the proposed guidelines are needed to improve the technical feasibility and generalizability of artificial intelligence algorithms.

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Response

Adrenal Gland
Diagnostic Accuracy of Computed Tomography in Predicting Primary Aldosteronism Subtype According to Age (Endocrinol Metab 2021;36:401-12, Seung Hun Lee et al.): Seung Hun Lee, Jong Woo Kim, Hyun-Ki Yoon, Jung-Min Koh, Chan Soo Shin, Sang Wan Kim, Jung Hee Kim; Endocrinol Metab. 2021;36(4):914-915. Published online August 27, 2021; DOI: https://doi.org/10.3803/EnM.2021.402

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Strategies for subtyping primary aldosteronism
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Diagnostic consistency between computed tomography and adrenal vein sampling of primary aldosteronism: Leading to successful curative outcome after adrenalectomy: A retrospective study
Byung-Chang Kim, Hyun-Ki Yoon, Kye Jin Park, Gun Ha Kim, Shin Jeong Pak, Douk Kwon, Jae Won Cho, Won Woong Kim, Yu-mi Lee, Jung-Min Koh, Seung Hun Lee, Ki-Wook Chung, Tae-Yon Sung
International Journal of Surgery.2023;[Epub] CrossRef

Original Articles

Clinical Study
Radioactive Parathyroid Adenomas on Sestamibi Scans: Low Parathyroid Hormone Secretory Potential and Large Volume: Sung Hye Kong, Jung Hee Kim, Sang Wan Kim, Chan Soo Shin; Endocrinol Metab. 2021;36(2):351-358. Published online April 6, 2021; DOI: https://doi.org/10.3803/EnM.2020.823

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Background
We investigated the clinical characteristics of parathyroid adenomas according to radioactivity on ^99mTc-methoxyisobutylisonitrile (^99mTc-MIBI) single-photon emission computed tomography/computed tomography (SPECT/CT) in primary hyperparathyroidism (PHPT) patients.
Methods
The study included 217 patients diagnosed with PHPT from 2000 to 2019 at Seoul National University Hospital who underwent ^99mTc-MIBI SPECT/CT scans. On SPECT/CT, the radioactivity of parathyroid adenomas was measured as the ratio of the mean radioactivity count of the parathyroid adenoma to that of the contralateral thyroid.
Results
Tumors were localized by MIBI scans in 190 patients (MIBI [+] group) and by ultrasound or parathyroid four-dimensional CT in 27 patients (MIBI [–] group). The mean age was 55 years, and mean body mass index was 23.4 kg/m². Patients in the MIBI (+) group had higher parathyroid hormone (iPTH) and lower 25-hydroxy vitamin D levels than those in the MIBI (–) group (168.0 pg/mL [interquartile range, IQR, 111.0 to 250.7] vs. 134.7 pg/mL [IQR, 98.2 to 191.2], P=0.049; 15.4 ng/mL [IQR, 11.1 to 20.8] vs. 21.2 ng/mL [IQR, 13.9 to 24.8], P=0.012, respectively). Patients in the MIBI (+) group had larger tumor volumes, but lower iPTH/volume ratios than those in the MIBI (–) group (1,216.66 [IQR, 513.40 to 2,663.02], 499.82 mm³ [IQR, 167.77 to 1,229.80], P=0.002; 0.18 [IQR, 0.08 to 0.46], 0.40 pg/mL/mm³ [IQR, 0.16 to 1.29], P=0.016, respectively). Adenoma radioactivity was positively correlated with calcium, iPTH, and volume (r=0.180, P=0.020; r=0.208, P=0.006; r=0.288, P<0.001, respectively), but not with iPTH/volume.
Conclusion
Parathyroid adenomas with positive MIBI scans had larger volumes and higher iPTH than adenomas with negative scans, but lower iPTH per unit volume.

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Protein Signatures of Parathyroid Adenoma according to Tumor Volume and Functionality
Sung Hye Kong, Jeong Mo Bae, Jung Hee Kim, Sang Wan Kim, Dohyun Han, Chan Soo Shin
Endocrinology and Metabolism.2024; 39(2): 375. CrossRef
Incidentally detected follicular thyroid carcinoma mimicking parathyroid adenoma on Tc-99m MIBI scan: A case report
Yeon-Hee Han, Hwan-Jeong Jeong, Sun Young Lee, Seok Tae Lim
Medicine.2024; 103(18): e38107. CrossRef
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Antonio Giulio Napolitano, Massimo Monacelli, Valeria Liparulo, Eleonora Coviello, Domenico Pourmolkara, Stefano Avenia, Andrea Polistena
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Clinical Study
Diagnostic Accuracy of Computed Tomography in Predicting Primary Aldosteronism Subtype According to Age: Seung Hun Lee, Jong Woo Kim, Hyun-Ki Yoon, Jung-Min Koh, Chan Soo Shin, Sang Wan Kim, Jung Hee Kim; Endocrinol Metab. 2021;36(2):401-412. Published online March 31, 2021; DOI: https://doi.org/10.3803/EnM.2020.901

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Background
Guidelines by the Endocrine Society Guideline on bypassing adrenal vein sampling (AVS) in patients <35 years old with marked primary aldosteronism (PA) (hypokalemia and elevated plasma aldosterone concentration [PAC]) and a unilateral lesion on computed tomography (CT) are based on limited number of studies. We aimed to determine the accuracy of CT in PA patients according to age.
Methods
In this retrospective study, we investigated the concordance between CT and AVS in 466 PA patients from two tertiary centers who successfully underwent AVS.
Results
CT had an overall accuracy of 64.4% (300/466). In the group with unilateral lesion, patients with hypokalemia had higher concordance than those without hypokalemia (85.0% vs. 43.6%, P<0.001). In the group with marked PA (hypokalemia and PAC >15.9 ng/dL) and unilateral lesion, accuracy of CT was 84.6% (11/13) in patients aged <35 years; 100.0% (20/20), aged 35 to 39 years; 89.4% (59/66), aged 40 to 49 years; and 79.8% (79/99), aged ≥50 years. Cut-off age and PAC for concordance was <50 years and >29.6 ng/dL, respectively. The significant difference in accuracy of CT in 198 patients with marked PA and a unilateral lesion between the <50-year age group and ≥50-year age group (90.9% vs. 79.8%, P=0.044) disappeared in 139 of 198 patients with PAC > 30.0 ng/dL (91.9% vs. 87.7%, P=0.590).
Conclusion
Patients with hypokalemia, PAC >30.0 ng/dL, and unilateral lesion were at high risk of unilateral PA regardless of age.

Citations

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Adrenal Vein Sampling for Primary Aldosteronism: Recommendations From the Australian and New Zealand Working Group
Jun Yang, Damon A. Bell, Richard Carroll, Cherie Chiang, Diane Cowley, Emma Croker, James C. G. Doery, Marianne Elston, Paul Glendenning, Julie Hetherington, Andrea R. Horvath, Shanshan Lu‐Shirzad, Elisabeth Ng, Amanda Mather, Nimalie Perera, Muddassir Ra
Clinical Endocrinology.2025; 102(1): 31. CrossRef
Predicting Bilateral Subtypes of Primary Aldosteronism Without Adrenal Vein Sampling: A Systematic Review and Meta-analysis
Elisabeth Ng, Stella May Gwini, Winston Zheng, Peter J Fuller, Jun Yang
The Journal of Clinical Endocrinology & Metabolism.2024; 109(2): e837. CrossRef
Subtype-specific Body Composition and Metabolic Risk in Patients With Primary Aldosteronism
Seung Shin Park, Chang Ho Ahn, Sang Wan Kim, Ji Won Yoon, Jung Hee Kim
The Journal of Clinical Endocrinology & Metabolism.2024; 109(2): e788. CrossRef
Imaging Concordance With Vein Sampling for Primary Aldosteronism: A Cohort Study and Literature Review
Sara Cartwright, MaKayla Gordon, Jessica Shank, Abbey Fingeret
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Correlation of Histopathologic Subtypes of Primary Aldosteronism with Clinical Phenotypes and Postsurgical Outcomes
Chang Ho Ahn, You-Bin Lee, Jae Hyeon Kim, Young Lyun Oh, Jung Hee Kim, Kyeong Cheon Jung
The Journal of Clinical Endocrinology & Metabolism.2024; 109(8): e1582. CrossRef
Temporal trends in clinical features of patients with primary aldosteronism over 20 years
Seung Shin Park, Chang Ho Ahn, Sang Wan Kim, Jung-Min Koh, Seung Hun Lee, Jung Hee Kim
Hypertension Research.2024; 47(8): 2019. CrossRef
Best Practices: Indications and Procedural Controversies of Adrenal Vein Sampling for Primary Aldosteronism
Keith B. Quencer, Abhilasha Singh, Anu Sharma
American Journal of Roentgenology.2023; 220(2): 190. CrossRef
Accuracy of Gallium-68 Pentixafor Positron Emission Tomography–Computed Tomography for Subtyping Diagnosis of Primary Aldosteronism
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Eleftheria Gkaniatsa, Oskar Ragnarsson
Experimental and Clinical Endocrinology & Diabetes.2023; 131(07/08): 435. CrossRef
2023 Korean Endocrine Society Consensus Guidelines for the Diagnosis and Management of Primary Aldosteronism
Jeonghoon Ha, Jung Hwan Park, Kyoung Jin Kim, Jung Hee Kim, Kyong Yeun Jung, Jeongmin Lee, Jong Han Choi, Seung Hun Lee, Namki Hong, Jung Soo Lim, Byung Kwan Park, Jung-Han Kim, Kyeong Cheon Jung, Jooyoung Cho, Mi-kyung Kim, Choon Hee Chung
Endocrinology and Metabolism.2023; 38(6): 597. CrossRef
Indices of ACTH‐stimulated adrenal venous sampling as predictors of postsurgical outcomes in primary aldosteronism
Seung Hun Lee, Jong Woo Kim, Hyun‐Ki Yoon, Sang Wan Kim, Su Jin Kim, Kyu Eun Lee, Yu‐Mi Lee, Tae‐Yon Sung, Suck Joon Hong, Chan Soo Shin, Jung‐Min Koh, Jung Hee Kim
Clinical Endocrinology.2022; 96(4): 521. CrossRef
Expression of CYP11B1 and CYP11B2 in adrenal adenoma correlates with clinical characteristics of primary aldosteronism
Chang Ho Ahn, Hee Young Na, So Yeon Park, Hyeong Won Yu, Su‐Jin Kim, June Young Choi, Kyu Eun Lee, Sang Wan Kim, Kyeong Cheon Jung, Jung Hee Kim
Clinical Endocrinology.2022; 96(1): 30. CrossRef
Letter to the Editor From Singhania et al: “Increasing Incidence of Primary Aldosteronism in Western Sweden During 3 Decades—Yet an Underdiagnosed Disorder”
Pankaj Singhania, Rana Bhattacharjee
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Development and validation of model for sparing adrenal venous sampling in diagnosing unilateral primary aldosteronism
Ying Song, Jun Yang, Hang Shen, Elisabeth Ng, Peter J. Fuller, Zhengping Feng, Jinbo Hu, Linqiang Ma, Yi Yang, Zhipeng Du, Yue Wang, Ting Luo, Wenwen He, Qifu Li, Fei-Fei Wu, Shumin Yang
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Validation of Existing Clinical Prediction Tools for Primary Aldosteronism Subtyping
Barbora Kološová, Petr Waldauf, Dan Wichterle, Jan Kvasnička, Tomáš Zelinka, Ondřej Petrák, Zuzana Krátká, Lubomíra Forejtová, Jan Kaván, Jiří Widimský, Robert Holaj
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Diagnostic Accuracy of Computed Tomography in Predicting Primary Aldosteronism Subtype According to Age (Endocrinol Metab 2021;36:401-12, Seung Hun Lee et al.)
Seung Hun Lee, Jong Woo Kim, Hyun-Ki Yoon, Jung-Min Koh, Chan Soo Shin, Sang Wan Kim, Jung Hee Kim
Endocrinology and Metabolism.2021; 36(4): 914. CrossRef
Diagnostic Accuracy of Computed Tomography in Predicting Primary Aldosteronism Subtype According to Age (Endocrinol Metab 2021;36:401-12, Seung Hun Lee et al.)
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Endocrinology and Metabolism.2021; 36(4): 912. CrossRef

Clinical Study
Whole Exome Sequencing Identifies Novel Genetic Alterations in Patients with Pheochromocytoma/Paraganglioma: Soo Hyun Seo, Jung Hee Kim, Man Jin Kim, Sung Im Cho, Su Jin Kim, Hyein Kang, Chan Soo Shin, Sung Sup Park, Kyu Eun Lee, Moon-Woo Seong; Endocrinol Metab. 2020;35(4):909-917. Published online December 23, 2020; DOI: https://doi.org/10.3803/EnM.2020.756

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Background
Pheochromocytoma and paragangliomas (PPGL) are known as tumors with the highest level of heritability, approximately 30% of all cases. Clinical practice guidelines of PPGL recommend genetic testing for germline variants in all patients. In this study, we used whole exome sequencing to identify novel causative variants associated with PPGL to improve the detection of rare genetic variants in our cohort.
Methods
Thirty-six tested negative for pathogenic variants in previous Sanger sequencing or targeted gene panel testing for PPGL underwent whole exome sequencing. Whole exome sequencing was performed using DNA samples enriched using TruSeq Custom Enrichment Kit and sequenced with MiSeq (Illumina Inc.). Sequencing alignment and variant calling were performed using SAMtools.
Results
Among previously mutation undetected 36 patients, two likely pathogenic variants and 13 variants of uncertain significance (VUS) were detected in 32 pheochromocytoma-related genes. SDHA c.778G>A (p.Gly260Arg) was detected in a patient with head and neck paraganglioma, and KIF1B c.2787-2A>C in a patient with a bladder paraganglioma. Additionally, a likely pathogenic variant in BRCA2, VUS in TP53, and VUS in NFU1 were detected.
Conclusion
Exome sequencing further identified genetic alterations by 5.6% in previously mutation undetected patients in PPGL. Implementation of targeted gene sequencing consisted of extended genes of PPGL in routine clinical screening can support the level of comprehensive patient assessment.

Citations

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Susan Richter, Nicole Bechmann
Journal of the Endocrine Society.2024;[Epub] CrossRef
Germline Mutations and Phenotypic Associations in Korean Patients With Pheochromocytoma and Paraganglioma: A Multicenter Study and Literature Review
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
Annals of Laboratory Medicine.2024; 44(6): 591. CrossRef
Clinical exome next‑generation sequencing panel for hereditary pheochromocytoma and paraganglioma diagnosis
Beatrice Melli, Vincenza Cusenza, Sandra Martinelli, Federica Castiglione, Loretta Fornaciari, Andrea Palicelli, Luca Braglia, Enrico Farnetti, Aurelio Negro, Simonetta Rosato, Andrea Frasoldati, Maicol Baldini, Chiara Grasselli, Davide Nicoli
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Case Report: Aggressive neural crest tumors in a child with familial von Hippel Lindau syndrome associated with a germline VHL mutation (c.414A>G) and a novel KIF1B gene mutation
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Mutations of 1p genes do not consistently abrogate tumor suppressor functions in 1p-intact neuroblastoma
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Clinical Study
Identification of Novel Genetic Variants Related to Trabecular Bone Score in Community-Dwelling Older Adults: Sung Hye Kong, Ji Won Yoon, Jung Hee Kim, JooYong Park, Jiyeob Choi, Ji Hyun Lee, A Ram Hong, Nam H. Cho, Chan Soo Shin; Endocrinol Metab. 2020;35(4):801-810. Published online November 24, 2020; DOI: https://doi.org/10.3803/EnM.2020.735

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Background
As the genetic variants of trabecular bone microarchitecture are not well-understood, we performed a genome-wide association study to identify genetic determinants of bone microarchitecture analyzed by trabecular bone score (TBS).
Methods
TBS-associated genes were discovered in the Ansung cohort (discovery cohort), a community-based rural cohort in Korea, and then validated in the Gene-Environment Interaction and Phenotype (GENIE) cohort (validation cohort), consisting of subjects who underwent health check-up programs. In the discovery cohort, 2,451 participants were investigated for 1.42 million genotyped and imputed markers.
Results
In the validation cohort, identified as significant variants were evaluated in 2,733 participants. An intronic variant in iroquois homeobox 3 (IRX3), rs1815994, was significantly associated with TBS in men (P=3.74E-05 in the discovery cohort, P=0.027 in the validation cohort). Another intronic variant in mitogen-activated protein kinase kinase 5 (MAP2K5), rs11630730, was significantly associated with TBS in women (P=3.05E-09 in the discovery cohort, P=0.041 in the validation cohort). Men with the rs1815994 variant and women with the rs11630730 variant had lower TBS and lumbar spine bone mineral density. The detrimental effects of the rs1815994 variant in men and rs11630730 variant in women were also identified in association analysis (β=–0.0281, β=–0.0465, respectively).
Conclusion
In this study, the rs1815994 near IRX3 in men and rs11630730 near MAP2K5 in women were associated with deterioration of the bone microarchitecture. It is the first study to determine the association of genetic variants with TBS. Further studies are needed to confirm our findings and identify additional variants contributing to the trabecular bone microarchitecture.

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Clinical Study
Stimulated Salivary Cortisol as a Noninvasive Diagnostic Tool for Adrenal Insufficiency: Yoon Ji Kim, Jung Hee Kim, A Ram Hong, Kyeong Seon Park, Sang Wan Kim, Chan Soo Shin, Seong Yeon Kim; Endocrinol Metab. 2020;35(3):628-635. Published online September 22, 2020; DOI: https://doi.org/10.3803/EnM.2020.707

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Background
Salivary cortisol is routinely used as a diagnostic test for Cushing syndrome. The diagnostic use of salivary cortisol for adrenal insufficiency (AI), however, is less established. We aimed to investigate the utility of morning basal and adrenocorticotropic hormone-stimulated salivary cortisol in diagnosing AI in Korean adults.
Methods
We prospectively included 120 subjects (female, n=70) from Seoul National University Hospital. AI was defined as a stimulated serum cortisol level of <496.8 nmol/L during the short Synacthen test (SST). Serum and saliva samples were drawn between 8:00 AM and 10:00 AM. Salivary cortisol levels were measured using an enzyme immunoassay kit.
Results
Thirty-four patients were diagnosed with AI according to the SST results. Age, sex, body mass index, serum albumin levels, and serum creatinine levels did not significantly differ between the normal and AI groups. Basal and stimulated salivary cortisol levels were positively correlated with basal (r=0.538) and stimulated serum cortisol levels (r=0.750), respectively (all P<0.001). Receiver operating characteristic curve analysis yielded a cutoff level of morning basal salivary cortisol of 3.2 nmol/L (sensitivity, 84.9%; specificity, 73.5%; area under the curve [AUC]=0.822). The optimal cutoff value of stimulated salivary cortisol was 13.2 nmol/L (sensitivity, 90.7%; specificity, 94.1%; AUC=0.959). Subjects with a stimulated salivary cortisol level above 13.2 nmol/L but a stimulated serum cortisol level below 496.8 nmol/L (n=2) had lower serum albumin levels than those showing a concordant response.
Conclusion
The diagnostic performance of stimulated salivary cortisol measurements after the SST was comparable to serum cortisol measurements for diagnosing AI.

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Endocrine Research
Transformation of Mature Osteoblasts into Bone Lining Cells and RNA Sequencing-Based Transcriptome Profiling of Mouse Bone during Mechanical Unloading: A Ram Hong, Kwangsoo Kim, Ji Yeon Lee, Jae-Yeon Yang, Jung Hee Kim, Chan Soo Shin, Sang Wan Kim; Endocrinol Metab. 2020;35(2):456-469. Published online June 24, 2020; DOI: https://doi.org/10.3803/EnM.2020.35.2.456; Correction in: Endocrinol Metab 2021;36(6):1314

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Background
We investigated RNA sequencing-based transcriptome profiling and the transformation of mature osteoblasts into bone lining cells (BLCs) through a lineage tracing study to better understand the effect of mechanical unloading on bone loss.
Methods
Dmp1-CreERt2(+):Rosa26R mice were injected with 1 mg of 4-hydroxy-tamoxifen three times a week starting at postnatal week 7, and subjected to a combination of botulinum toxin injection with left hindlimb tenotomy starting at postnatal week 8 to 10. The animals were euthanized at postnatal weeks 8, 9, 10, and 12. We quantified the number and thickness of X-gal(+) cells on the periosteum of the right and left femoral bones at each time point.
Results
Two weeks after unloading, a significant decrease in the number and a subtle change in the thickness of X-gal(+) cells were observed in the left hindlimbs compared with the right hindlimbs. At 4 weeks after unloading, the decrease in the thickness was accelerated in the left hindlimbs, although the number of labeled cells was comparable. RNA sequencing analysis showed downregulation of 315 genes in the left hindlimbs at 2 and 4 weeks after unloading. Of these, Xirp2, AMPD1, Mettl11b, NEXN, CYP2E1, Bche, Ppp1r3c, Tceal7, and Gadl1 were upregulated during osteoblastogenic/osteocytic and myogenic differentiation in vitro.
Conclusion
These findings demonstrate that mechanical unloading can accelerate the transformation of mature osteoblasts into BLCs in the early stages of bone loss in vivo. Furthermore, some of the genes involved in this process may have a pleiotropic effect on both bone and muscle.

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