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Winarto H, Habiburrahman M, Siregar TP, Nuryanto KH. Magnetic resonance imaging pitfalls in determining myometrial invasion in stage I endometrial cancer: A case report and literature review. Radiol Case Rep 2022; 17:2680-2688. [PMID: 35663819 PMCID: PMC9160413 DOI: 10.1016/j.radcr.2022.05.021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2022] [Revised: 05/06/2022] [Accepted: 05/11/2022] [Indexed: 11/17/2022] Open
Abstract
The degree of myometrial invasion (MI) is crucial in the preoperative diagnosis of endometrial cancer (EC) using MRI in terms of therapeutic and prognostic implications. However, several pitfalls should be kept in mind when using this modality. We report a case of EC on a 64-year-old woman, identified preoperatively without MI based on ultrasonography and MRI, implying a low risk of lymph node metastasis; surprisingly, the uterine incision showed the lesion had invaded <50% of the myometrium. Thus, a total laparoscopic hysterectomy and bilateral salpingo-oophorectomy were performed, and histopathologic analysis confirmed that the EC was on stage IA (cancer is in the endometrium only or less than halfway through the myometrium). In our case, thinning myometrium and uterine atrophy due to aging, multiple leiomyomas, previous curettage, and blood clots were all pitfalls for MRI in detecting MI. By detecting tiny or isointense tumors and depicting distinct vascularity of the malignancy in postmenopausal women, functional MRI techniques such as diffusion-weighted imaging (DWI) and dynamic contrast-enhanced MRI (DCE-MRI) can help reduce pitfalls when assessing MI. Clinicians can employ DWI preoperatively, which is more reliable and superior to DCE-MRI in determining tumor areas without contrast injection and perform a postoperative histopathological examination to confirm MI in EC.
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Dickson Michelson EL, Kram JJF, Heslin K, Baugh D, Bamra V, Hu J, Shukla A, Kamelle SA. Can Magnetic Resonance Imaging Predict Pathologic Findings for Endometrioid Endometrial Cancer? J Patient Cent Res Rev 2020; 7:206-212. [PMID: 32377553 DOI: 10.17294/2330-0698.1720] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
Abstract
This pilot study aimed to assess the feasibility of precisely measuring tumor diameter and myometrial invasion in patients with endometrioid endometrial cancer (EEC) using preoperative contrast-enhanced magnetic resonance imaging (MRI). Adult patients with confirmed diagnosis of complex hyperplasia with atypia or EEC were included. Three radiologists separately measured tumor diameter and myometrial invasion. Basic descriptive statistics were used to describe patient characteristics and to compare radiology- and pathology-measured tumor diameter and myometrial invasion. Using the pathology results for tumor diameter as the gold standard for comparison, at least 1 radiologist was able to predict largest tumor diameter within 5 mm for 41.7% of patients. Similarly, based on pathology results for myometrial invasion, at least 1 radiologist was able to predict myometrial invasion within 5% for 50% of patients. All radiologists were able to predict superficial (<50%) or deep (≥50%) myometrial invasion for 75% of patients, with greater sensitivity, specificity, and accuracy for deep myometrial invasion. Given variation among radiologic measurements, it is difficult to recommend preoperative MRI as a basis for measuring tumor diameter and myometrial invasion. Even so, the ability to predict superficial versus deep myometrial invasion may benefit patients with EEC for whom surgery is not a viable option or for those seeking fertility-sparing treatment options.
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Affiliation(s)
| | - Jessica J F Kram
- Aurora UW Medical Group, Aurora Health Care, Milwaukee, WI.,Center for Urban Population Health, Milwaukee, WI
| | - Kayla Heslin
- Aurora UW Medical Group, Aurora Health Care, Milwaukee, WI.,Center for Urban Population Health, Milwaukee, WI.,Aurora Research Institute, Aurora Health Care, Milwaukee, WI
| | - David Baugh
- Radiology, Aurora St. Luke's Medical Center, Milwaukee, WI
| | - Vikram Bamra
- Radiology, Aurora St. Luke's Medical Center, Milwaukee, WI
| | - Jiahao Hu
- Radiology, Aurora St. Luke's Medical Center, Milwaukee, WI
| | - Abhishek Shukla
- Pathology, Aurora St. Luke's Medical Center, Aurora Health Care, Milwaukee, WI
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Reijnen C, IntHout J, Massuger LFAG, Strobbe F, Küsters-Vandevelde HVN, Haldorsen IS, Snijders MPLM, Pijnenborg JMA. Diagnostic Accuracy of Clinical Biomarkers for Preoperative Prediction of Lymph Node Metastasis in Endometrial Carcinoma: A Systematic Review and Meta-Analysis. Oncologist 2019; 24:e880-e890. [PMID: 31186375 DOI: 10.1634/theoncologist.2019-0117] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2019] [Revised: 04/29/2019] [Accepted: 05/01/2019] [Indexed: 11/17/2022] Open
Abstract
BACKGROUND In endometrial carcinoma (EC), preoperative classification is based on histopathological criteria, with only moderate diagnostic performance for the risk of lymph node metastasis (LNM). So far, existing molecular classification systems have not been evaluated for prediction of LNM. Optimized use of clinical biomarkers as recommended by international guidelines might be a first step to improve tailored treatment, awaiting future molecular biomarkers. AIM To determine the diagnostic accuracy of preoperative clinical biomarkers for the prediction of LNM in endometrial cancer. METHODS A systematic review was performed according to the Meta-analysis of Observational Studies in Epidemiology (MOOSE) guidelines. Studies identified in MEDLINE and EMBASE were selected by two independent reviewers. Included biomarkers were based on recommended guidelines (cancer antigen 125 [Ca-125], lymphadenopathy on magnetic resonance imaging, computed tomography, and 18F-fluorodeoxyglucose positron emission tomography/computed tomography [18FDG PET-CT]) or obtained by physical examination (body mass index, cervical cytology, blood cell counts). Pooled sensitivity, specificity, area under the curve (AUC), and likelihood ratios were calculated with bivariate random-effects meta-analysis. Likelihood ratios were classified into small (0.5-1.0 or 1-2.0), moderate (0.2-0.5 or 2.0-5.0) or large (0.1-0.2 or ≥ 5.0) impact. RESULTS Eighty-three studies, comprising 18,205 patients, were included. Elevated Ca-125 and thrombocytosis were associated with a moderate increase in risk of LNM; lymphadenopathy on imaging with a large increase. Normal Ca-125, cytology, and no lymphadenopathy on 18FDG PET-CT were associated with a moderate decrease. AUCs were above 0.75 for these biomarkers. Other biomarkers had an AUC <0.75 and incurred only small impact. CONCLUSION Ca-125, thrombocytosis, and imaging had a large and moderate impact on risk of LNM and could improve preoperative risk stratification. IMPLICATIONS FOR PRACTICE Routine lymphadenectomy in clinical early-stage endometrial carcinoma does not improve outcome and is associated with 15%-20% surgery-related morbidity, underlining the need for improved preoperative risk stratification. New molecular classification systems are emerging but have not yet been evaluated for the prediction of lymph node metastasis. This article provides a robust overview of diagnostic performance of all clinical biomarkers recommended by international guidelines. Based on these, at least measurement of cancer antigen 125 serum level, assessment of thrombocytosis, and imaging focused on lymphadenopathy should complement current preoperative risk stratification in order to better stratify these patients by risk.
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Affiliation(s)
- Casper Reijnen
- Department of Obstetrics and Gynaecology, Radboud University Medical Center, Nijmegen, The Netherlands
- Department of Obstetrics and Gynaecology, Canisius Wilhelmina Hospital, Nijmegen, The Netherlands
| | - Joanna IntHout
- Department for Health Evidence, Radboud University Medical Center, Nijmegen, The Netherlands
| | - Leon F A G Massuger
- Department of Obstetrics and Gynaecology, Radboud University Medical Center, Nijmegen, The Netherlands
| | - Fleur Strobbe
- Department of Obstetrics and Gynaecology, Radboud University Medical Center, Nijmegen, The Netherlands
| | | | - Ingfrid S Haldorsen
- Mohn Medical Imaging and Visualization Centre, Department of Radiology, Haukeland University Hospital, Bergen, Norway
- Department of Clinical Medicine, University of Bergen, Bergen, Norway
| | - Marc P L M Snijders
- Department of Obstetrics and Gynaecology, Canisius Wilhelmina Hospital, Nijmegen, The Netherlands
| | - Johanna M A Pijnenborg
- Department of Obstetrics and Gynaecology, Radboud University Medical Center, Nijmegen, The Netherlands
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Magnetic resonance imaging in the assessment of high-risk features of endometrial carcinoma: a meta-analysis. Int J Gynecol Cancer 2016; 25:837-42. [PMID: 25010040 DOI: 10.1097/igc.0000000000000194] [Citation(s) in RCA: 58] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
OBJECTIVE The aim of this study was to review the available literature on the reliability of contemporary magnetic resonance imaging (MRI) techniques in the assessment of high-risk features of endometrial carcinoma, that is, deep myometrial invasion, cervical stromal involvement, and lymph node metastasis. METHODS The PubMed and Scopus databases were searched for studies published before March 2014. Studies on plain MRI were excluded. RESULTS Fifty-two eligible studies were identified. For the assessment of deep (≥ 50%) myometrial invasion (50 studies, 3720 patients), the pooled sensitivity, specificity, positive predictive value, and negative predictive value were 80.7%, 88.5%, 77.6%, and 89.5%, respectively, by random-effects analysis. For predicting cervical stromal involvement (12 studies, 1153 patients), the pooled values were 57.0%, 94.8%, 68.7%, and 90.5%, respectively. For lymph node metastasis on a per-patient basis (10 studies, 862 patients), they were 43.5%, 95.9%, 66.3%, and 92.2%, respectively. In a meta-regression analysis, dynamic imaging was associated with a higher sensitivity in detecting deep myometrial invasion, as compared with contrast-enhanced imaging (P = 0.021). The improvement by diffusion-weighted imaging was of a borderline significance (P = 0.057). Significant small-study effects were found for the sensitivity of MRI in detecting deep myometrial invasion (P < 0.0001) and cervical stromal involvement (P = 0.049). CONCLUSIONS Considering the poor-to-moderate sensitivity of MRI in detecting high-risk features of endometrial carcinoma, patients with negative findings on MRI may not safely forgo surgical staging unless the findings are confirmed by a backup method. The high specificities allow the targeting of staging procedures by MRI alone in patients with positive findings. Compared with contrast-enhanced imaging, dynamic and diffusion-weighted imaging may be more reliable in the radiological staging of endometrial carcinoma.
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Bhosale P, Ma J, Iyer R, Ramalingam P, Wei W, Soliman P, Frumovitz M, Kundra V. Feasibility of a reduced field-of-view diffusion-weighted (rFOV) sequence in assessment of myometrial invasion in patients with clinical FIGO stage I endometrial cancer. J Magn Reson Imaging 2016; 43:316-24. [PMID: 26185031 PMCID: PMC4715803 DOI: 10.1002/jmri.25001] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2015] [Accepted: 06/25/2015] [Indexed: 01/23/2023] Open
Abstract
PURPOSE To compare the clinical usefulness of reduced field-of-view diffusion-weighted imaging (rFOV) with other imaging techniques in determining the depth of myometrial invasion (DMI) in endometrial cancer. MATERIALS AND METHODS In this prospective study we reviewed 3T magnetic resonance images of 51 patients with clinical Stage I endometrial cancer who underwent total abdominal hysterectomy with bilateral salphingoopherectomy within 3 days after imaging. rFOV with apparent diffusion coefficient reconstruction was obtained in three standard planes followed by sagittal T2 -weighted (T2 WI) images and 3D dynamic T1 -weighted and contrast-enhanced imaging (DCE MRI). Two radiologists with expertise in imaging gynecologic cancers evaluated images independently. The DMI was recorded on imaging and correlated with surgical pathology results. Sensitivity, specificity, positive predictive value, negative predictive value, and accuracy for DMI were calculated (<50% vs. >50%). RESULTS Compared with sagittal T2 WI + DCE MRI, rFOV imaging yielded greater specificity (82.2% vs. 90.0%, positive predictive value (42.8% vs. 60.0%), and accuracy (84.0% vs. 92%) for DMI determined by reader 1 and greater the sensitivity (83.3% vs. 100%) for DMI determined by reader 2. The error of measurement of DMI as a continuous variable in millimeters did not differ significantly between the rFOV and pathology results (P < 0.21). However, there was a statistically significant difference for the DMI measured on the dynamic sequence. The DMI on DCE was greater than that seen on pathology at P = 0.02. CONCLUSION rFOV can be used to assess DMI in clinical Stage I endometrial cancer.
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Affiliation(s)
- Priya Bhosale
- Department of Diagnostic Radiology, the University of Texas MD Anderson Cancer Center, Houston, Texas 77030, USA
| | - Jingfei Ma
- Department of Physics, The University of Texas MD Anderson Cancer Center, Houston, Texas 77030
| | - Revathy Iyer
- Department of Diagnostic Radiology, the University of Texas MD Anderson Cancer Center, Houston, Texas 77030, USA
| | - Preetha Ramalingam
- Department of Pathology, The University of Texas MD Anderson Cancer Center, Houston, Texas 77030
| | - Wei Wei
- Department of Biostatistics, The University of Texas MD Anderson Cancer Center, Houston, Texas 77030
| | - Pamela Soliman
- Department of Gynecologic Oncology, The University of Texas MD Anderson Cancer Center, Houston, Texas 77030, USA
| | - Michael Frumovitz
- Department of Gynecologic Oncology, The University of Texas MD Anderson Cancer Center, Houston, Texas 77030, USA
| | - Vikas Kundra
- Department of Diagnostic Radiology, the University of Texas MD Anderson Cancer Center, Houston, Texas 77030, USA
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Teng F, Zhang YF, Wang YM, Yu J, Lang X, Tian WY, Jiang CX, Xue FX. Contrast-enhanced MRI in preoperative assessment of myometrial and cervical invasion, and lymph node metastasis: diagnostic value and error analysis in endometrial carcinoma. Acta Obstet Gynecol Scand 2015; 94:266-73. [PMID: 25545203 DOI: 10.1111/aogs.12570] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2014] [Accepted: 12/12/2014] [Indexed: 01/01/2023]
Abstract
OBJECTIVE To determine the ability of contrast-enhanced magnetic resonance imaging to predict myometrial invasion, cervical invasion, and pelvic lymph node metastasis in endometrial carcinoma and to analyze factors that lead to errors in this identification. DESIGN A retrospective study. SETTING University general hospital. POPULATION A total of 167 women diagnosed with endometrial carcinoma. METHODS All patients received a preoperative contrast-enhanced magnetic resonance imaging scan. Histopathological findings were used as the definitive diagnosis. MAIN OUTCOME MEASURES The results were compared with histopathological findings, factors that make accurate assessment of myometrial invasion, cervical invasion, and pelvic lymph node metastasis difficult by contrast-enhanced magnetic resonance imaging were analyzed. RESULTS The sensitivity, specificity, diagnostic accuracy, positive predictive values, and negative predictive values of contrast-enhanced magnetic resonance imaging were 90.9, 91.8, 91.6, 73.2 and 97.6%, respectively, for identifying deep myometrial invasion; 84.2, 96.0, 94.6, 72.7 and 97.9%, respectively, for identifying cervical invasion; and 45.0, 91.2, 85.6, 40.9 and 92.4%, respectively, for identifying pelvic lymph node metastasis. The main causes of error in contrast-enhanced magnetic resonance imaging were myomas, cornual lesions, deep myometrial invasion, large tumor size, non-endometrioid tumor type, and lower tumor grade. CONCLUSION Contrast-enhanced magnetic resonance imaging has a high accuracy and a low tendency to produce false-negative predictive values. Gynecological oncologists should combine the imaging data and clinical information to make therapeutic decisions and avoid diagnostic errors.
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Affiliation(s)
- Fei Teng
- Department of Obstetrics and Gynecology, Tianjin Medical University General Hospital, Tianjin, China
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Predictive value of serum human epididymis protein 4 and cancer antigen 125 concentrations in endometrial carcinoma. Am J Obstet Gynecol 2013; 209:142.e1-6. [PMID: 23583212 DOI: 10.1016/j.ajog.2013.04.014] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2012] [Revised: 02/22/2013] [Accepted: 04/04/2013] [Indexed: 11/20/2022]
Abstract
OBJECTIVE The purpose of this study was to evaluate the performance of preoperative serum levels of human epididymis protein 4 (HE4) and cancer antigen 125 (CA125) in the prediction of the presence of metastases in endometrial carcinoma. STUDY DESIGN Preoperative sera were collected from 98 women with a diagnosis of endometrial carcinoma. The concentrations of HE4 and CA125 were assessed by enzyme-linked immunosorbent assay and correlated with the results of the final histopathologic report. RESULTS Fourteen patients had metastases (≥stage IIIA, International Federation of Gynecology and Obstetrics 2009 classification). The serum concentrations of HE4 and CA125 were higher in the group with metastases than in the group without metastases (median [interquartile range], 148.6 pmol/L [71.6-219.1 pmol/L] vs 77.2 pmol/L [52.9-99.3 pmol/L]; P = .001; and 20.0 U/mL [10.1-70.8 U/mL] vs 4.3 U/mL [2.9-10.4 U/mL]; P < .001, respectively). By a multivariate analysis, the combination of HE4 and CA125 (a risk score algorithm) was the only predictive factor for the presence of metastases (odds ratio, 21.562; 95% confidence interval, 5.472-84.963; P < .001), and the grade was the predictor for a deep (≥50%) myometrial invasion by the tumor (odds ratio, 2.005; 95% confidence interval, 1.123-3.581; P = .019). The sensitivity, specificity, positive predictive value, and negative predictive value for the combination of the markers to predict the presence of metastases were 71.4%, 89.5%, 55.6%, and 94.4%, respectively. CONCLUSION A combination of preoperative HE4 and CA125 seems to be a better predictor of metastatic disease than either 1 alone in endometrial carcinoma.
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SAARELAINEN SAMIK, KÖÖBI LEA, JÄRVENPÄÄ RITVA, LAURILA MARITA, MÄENPÄÄ JOHANNAU. The preoperative assessment of deep myometrial invasion by three-dimensional ultrasound versus MRI in endometrial carcinoma. Acta Obstet Gynecol Scand 2012; 91:983-90. [DOI: 10.1111/j.1600-0412.2012.01439.x] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Saarelainen SK, Vuento MH, Kirkinen P, Mäenpää JU. Preoperative assessment of endometrial carcinoma by three-dimensional power Doppler angiography. ULTRASOUND IN OBSTETRICS & GYNECOLOGY : THE OFFICIAL JOURNAL OF THE INTERNATIONAL SOCIETY OF ULTRASOUND IN OBSTETRICS AND GYNECOLOGY 2012; 39:466-472. [PMID: 21953858 DOI: 10.1002/uog.10103] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 09/12/2011] [Indexed: 05/31/2023]
Abstract
OBJECTIVE Preoperative evaluation of the depth of myometrial invasion in endometrial carcinoma is challenging. The objective of this study was to evaluate the usefulness of three-dimensional power Doppler angiography (3D-PDA) in this setting. METHODS Sonographic and histological data on 100 consecutive cases of endometrial carcinoma were analyzed. The endometrial and myometrial vascular indices VI (vascularization index), FI (flow index) and VFI (vascularization flow index) were calculated by 3D-PDA. The results were compared with a complete surgical staging. RESULTS The mean ( ± SD) age of patients was 67.1 ± 8.8 (range, 33-87) years. Forty-six patients had deep (≥ 50%) myometrial invasion. Eight patients had metastases, seven of them with deep invasion. Three patients were found to have carcinomas of non-uterine origin on histology, and these were excluded from further statistical analysis. The median endometrial and myometrial vascular indices were higher in the group with deep invasion than in the group without. Following multivariable analysis of the indices only the endometrial FI was independently associated with deep invasion (OR, 1.061; 95% CI, 1.023-1.099; P = 0.001). However, a greater endometrial volume was also an independent predictor of deep invasion (OR, 1.109; 95% CI, 1.011-1.215; P = 0.028). CONCLUSION Our study suggests that endometrial and, to a lesser degree, myometrial vascular indices and endometrial volume correlate with the depth of myometrial invasion in endometrial carcinoma.
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Affiliation(s)
- S K Saarelainen
- Department of Obstetrics and Gynecology, Tampere University Hospital, Tampere, Finland
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Suh DH, Kim HS, Chung HH, Kim JW, Park NH, Song YS, Kang SB. Pre-operative systemic inflammatory response markers in predicting lymph node metastasis in endometrioid endometrial adenocarcinoma. Eur J Obstet Gynecol Reprod Biol 2012; 162:206-10. [PMID: 22445206 DOI: 10.1016/j.ejogrb.2012.02.028] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2011] [Revised: 12/19/2011] [Accepted: 02/29/2012] [Indexed: 11/24/2022]
Abstract
OBJECTIVES To evaluate the correlation of pre-operative systemic inflammatory response (SIR) markers with lymph node (LN) metastasis compared with serum CA-125 in endometrioid endometrial adenocarcinoma. STUDY DESIGN Retrospective review of 319 patients who were pathologically proven to have endometrioid endometrial adenocarcinoma after staging operations. Serum CA-125 and pre-operative SIR markers [neutrophil/lymphocyte ratio (NLR), platelet/lymphocyte ratio (PLR), C-reactive protein (CRP), albumin, platelets and fibrinogen] were assessed. Receiver operating characteristic (ROC) curves were plotted for each SIR marker and serum CA-125. RESULTS NLR, PLR and serum CA-125 were higher in the LN-positive group compared with the LN-negative group (p=0.003, 0.012 and 0.025, respectively). Serum albumin was significantly lower in the LN-positive group compared with the LN-negative group (p<0.001). ROC curves demonstrated the best cut-off values for NLR (≥1.97), PLR (≥9.14), albumin (≤4.15 g/dl) and serum CA-125 (≥32.50 U/ml) for pre-operative diagnosis of LN metastasis. Sensitivity, specificity, positive predictive value (PPV), negative predictive value (NPV) and accuracy of serum CA-125 were 63.3%, 87.6%, 37.3%, 95.4% and 85.1%, respectively. No pre-operative SIR markers were superior to serum CA-125 in terms of sensitivity, specificity, PPV, NPV or accuracy, with the exception of the slightly higher sensitivity of PLR (64.5%). CONCLUSIONS Pre-operative SIR markers do not appear to be more effective in predicting LN metastasis than serum CA-125 in endometrioid endometrial adenocarcinoma.
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Affiliation(s)
- Dong Hoon Suh
- Department of Obstetrics and Gynaecology, Seoul National University College of Medicine, Seoul, Republic of Korea
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