Journal of Pathology and Translational Medicine

Review Article

A comprehensive review of ossifying fibromyxoid tumor: insights into its clinical, pathological, and molecular landscape: Kyriakos Chatzopoulos, Antonia Syrnioti, Mohamed Yakoub, Konstantinos Linos; J Pathol Transl Med. 2026;60(1):6-19. Published online January 14, 2026; DOI: https://doi.org/10.4132/jptm.2025.10.02

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Abstract PDF: Ossifying fibromyxoid tumor (OFMT) is a rare mesenchymal neoplasm first described in 1989. It typically arises in the superficial soft tissues of the extremities as a slow-growing, painless mass. Histologically, it is commonly characterized by a multilobular architecture composed of uniform epithelioid cells embedded in a fibromyxoid matrix, often surrounded by a rim of metaplastic bone. While classic cases are readily identifiable, the tumor's histopathological heterogeneity can mimic a range of benign and malignant neoplasms, posing significant diagnostic challenges. Molecularly, most OFMTs harbor PHF1 rearrangements, commonly involving fusion partners such as EP400, MEAF6, or TFE3. This review underscores the importance of an integrated diagnostic approach- incorporating histopathological, immunohistochemical, and molecular data- to accurately classify OFMT and distinguish it from its mimics. Expanding awareness of its morphologic and molecular spectrum is essential for precise diagnosis, optimal patient management, and a deeper understanding of this enigmatic neoplasm.

Original Articles

E-cadherin expression and tumor-stroma ratio as prognostic biomarkers of peritoneal recurrence in advanced gastric cancer: a digital image analysis-based stratification study: Somang Lee, Binnari Kim; J Pathol Transl Med. 2025;59(6):408-420. Published online November 6, 2025; DOI: https://doi.org/10.4132/jptm.2025.08.27

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Abstract PDF: Background
Gastric cancer remains a significant global health burden, with a high peritoneal recurrence rates after curative surgery. E-cadherin and the tumor-stroma ratio (TSR) have been proposed as prognostic indicators, but their combined prognostic utility remains unclear. Methods: This retrospective study included 130 patients with T3/T4a gastric cancer who underwent curative gastrectomy at Ulsan University Hospital between 2014 and 2019. Immunohistochemistry for E-cadherin and Vimentin was performed. Digital image analysis using QuPath’s object classifier quantified E-cadherin expression and TSR. Results: Low E-cadherin expression was associated with diffuse-type histology and advanced T stage. Low TSR was linked to younger age, female sex, and XELOX treatment. In Kaplan-Meier analysis, low TSR showed a non-significant trend toward higher peritoneal recurrence (p = .054), while low E-cadherin expression was significantly associated with increased peritoneal recurrence (p = .002). Combined biomarker analysis also revealed a significant difference in recurrence-free survival (RFS) among the four groups (p = .005); patients with both high TSR and high E-cadherin expression experienced the most favorable RFS. In multivariable analysis, E-cadherin expression remained the only independent predictor of peritoneal recurrence (high vs. low; hazard ratio, 0.348; 95% confidence interval, 0.149 to 0.816; p = .015). Conclusions: E-cadherin and TSR reflect distinct tumor biology such as epithelial integrity and stromal composition, and their combined evaluation improves prognostic stratification. Digital image analysis enhances reproducibility and objectivity, supporting their integration into clinical workflows.

Adenomatoid odontogenic tumor: clinicopathological analysis of 34 cases from Karachi, Pakistan: Summaya Zafar, Sehar Sulaiman, Madeeha Nisar, Poonum Khan, Nasir Ud Din; J Pathol Transl Med. 2025;59(6):390-397. Published online October 16, 2025; DOI: https://doi.org/10.4132/jptm.2025.07.11

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Abstract PDF: Background
Adenomatoid odontogenic tumor (AOT) is a benign slow-growing neoplasm of odontogenic epithelial origin that is relatively uncommon. Only a few studies have described its histological features. Hence, we aimed to describe the clinicopathological features of AOT in a cohort of patients. Methods: AOT cases diagnosed between 2009 and 2024 were searched electronically. Glass slides were retrieved from archives and were reviewed by two pathologists to record the associated morphological features. Other data including patient demographics and tumor site were collected by reviewing histopathology reports. Results: The age of patients ranged from 9 to 44 years (mean, 17.7 years), and most were female (55.9%). The maxilla (44.1%) was the most common tumor site. Histologically, a predominantly solid growth pattern (n = 34) accompanied by ducts with a cuboidal/columnar epithelial lining (n = 31), eosinophilic secretions (n = 31), calcifications (n = 31), lattice work pattern (n = 30), and cystic areas (n = 20) were observed. Less frequent features included calcifying epithelial odontogenic tumor (CEOT)–like areas (n = 13), osteodentin (n = 6), association with impacted tooth (n = 3), mucin in tubules (n = 7), fibrocollagenous stroma (n = 6), mucin in ducts (n = 3) and ossifying fibroma-like areas (n = 6). The association of ducts with a cuboidal/columnar epithelial lining, lattice work pattern, calcifications, and eosinophilic secretions with gingival tumors was statistically significant (p ≤ .05). Additionally, tooth tumors were significantly associated with CEOT-like areas (p = .03). Conclusions: Our study confirms the trends in the clinicopathological features of AOT in previous case reports. Our results suggest that AOTs usually exhibit a predominantly solid pattern with duct-like spaces. Only a few cases with CEOT-like and ossifying fibroma-like areas were observed, similar to infrequent cases reported in the past.

Attitudes toward artificial intelligence in pathology: a survey-based study of pathologists in northern India: Manupriya Sharma, Kavita Kumari, Navpreet Navpreet, Sushma Bharti, Rajneesh Kumari; J Pathol Transl Med. 2025;59(6):382-389. Published online October 2, 2025; DOI: https://doi.org/10.4132/jptm.2025.07.10

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Abstract PDF Supplementary Material: Background
Artificial intelligence (AI) is transforming pathology by enhancing diagnostic accuracy, efficiency, and workflow standardization. Despite its growing presence, AI adoption remains limited, particularly in resource-constrained settings like India. This study assessed the knowledge, awareness, and perceptions of AI among pathologists in Northern India. Methods: A cross-sectional survey was conducted among 138 practicing pathologists in Northern India between April and June 2024. A structured online questionnaire was used to collect data on demographics, AI awareness, self-reported knowledge, sources of AI education, technological proficiency, and interest in AI-related training programs. Data analysis included descriptive statistics and chi-square tests, with p < .05 considered statistically significant. Results: AI awareness was high (88.4%), with significant sex differences (93.5% in females vs. 78.3% in males, p = .008). However, formal AI training was limited (6.5%), and only 16.7% had used AI as a diagnostic tool. Academic pathologists were more likely to engage with AI literature than their non-academic counterparts (p = .003). Interest in AI workshops was strong (92.8%). Access to whole slide imaging (WSI) correlated with higher AI knowledge (p = .008), as did self-reported technological proficiency (p = .001). Conclusions: Despite high AI awareness among pathologists, significant gaps remain in training, infrastructure, and practical application. Expanding access to digital pathology tools like WSI and improving digital literacy could facilitate AI adoption. Structured educational programs and greater investment in digital infrastructure are crucial for integrating AI into pathology practice.

National quality assurance program using digital cytopathology: a 5-year digital transformation experience by the Korean Society for Cytopathology: Yosep Chong, Hyeong Ju Kwon, Soon Auck Hong, Sung Soon Kim, Bo-Sung Kim, Younghee Choi, Yoon Jung Choi, Jung-Soo Pyo, Ji Yun Jeong, Soo Jin Jung, Hoon Kyu Oh, Seung-Sook Lee; J Pathol Transl Med. 2025;59(5):320-333. Published online September 15, 2025; DOI: https://doi.org/10.4132/jptm.2025.06.27

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Background
Digital cytopathology (DC) is emerging as a transformative approach in quality assurance programs (QAP), though its comprehensive evaluation remains limited. Since 2020, the Korean Society for Cytopathology has progressively incorporated DC into its national QAP, including digital proficiency testing (PT), sample adequacy testing (SAT), a customizable PT module, and a self-assessment module (SAM), aiming for full digital implementation by 2026. Methods: This 5-year study assessed diagnostic concordance between conventional and digital PT formats and analyzed participant feedback on service quality and digital image usability across PT, SAT, and SAM. Parallel testing was conducted during the transitional phase, and satisfaction was measured through structured surveys. Results: Participation in digital PT increased from 48 institutions in 2020 to 93 in 2024, while digital SAT participation rose from 29 to 71 between 2022 and 2024. In 2023, 56 institutions joined SAM. Diagnostic concordance rates were comparable between digital and conventional PTs (78.6%–84.6% vs. 82.0%–85.1%), including similar category C (major discordance) rates. Satisfaction with digital PT services and image quality exceeded 85%, and over 90% of institutions reported positive feedback on SAT and SAM. Over 80% were satisfied with the customizable PT module. Conclusions: DC is a reliable and effective modality for cytopathology QAP. It demonstrates diagnostic equivalence to conventional methods and high user satisfaction, supporting its broader implementation in national quality assurance frameworks.

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Practice of Cytopathology in Korea: A 40‐Year Evolution Through Standardization, Digital Transformation, and Global Partnership
Yosep Chong, Ran Hong, Hyeong Ju Kwon, Haeryoung Kim, Lucia Kim, Soon Jae Kim, Yoon Jung Choi
Diagnostic Cytopathology.2025;[Epub] CrossRef

A single-institution demographic study of pathologically proven kidney disease in South Korea over the last 33 years: Hyejin Noh, Jiyeon Kim, Yeong Jin Choi; J Pathol Transl Med. 2025;59(5):306-319. Published online September 10, 2025; DOI: https://doi.org/10.4132/jptm.2025.06.18

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Abstract PDF Supplementary Material: Background
To date, epidemiological studies on the entire spectrum of kidney disease based on pathology have been rarely reported. Methods: A retrospective study was conducted on patients diagnosed with kidney disease at Seoul St. Mary's Hospital between 1991 and 2023. Results: Among 7,803 patients with native kidney disease, glomerular disease (70.3%) was the most common, followed by tubulointerstitial (15.1%) and vascular disease (8.8%). In kidney biopsy, glomerular disease (77.8%) showed the highest frequency, particularly in those under 20s (95.6%) (p = .013). Primary glomerulonephritis (GN) (72.8%) was the predominant glomerular disease, with IgA nephropathy (IgAN) (47.3%) being the most common one. Tubulointerstitial and vascular diseases increased with age, showing the highest prevalence in those over 60 years (p = .008 and p = .032, respectively). Glomerular disease was diagnosed at a younger age (39.7 ± 16.7 years) than tubulointerstitial (49.1 ± 16.2) and vascular (48.1 ± 15.3) diseases (p < .001). When glomerular diseases were classified morphologically, proliferative GN (57.9%) was the most common, followed by non-proliferative (39.6%) and sclerosing (1.6%). When classified by etiology, primary GN accounted for the most (72.8%), followed by secondary (19.3%) and hereditary GN (5.7%). In nephrectomy, tubulointerstitial disease (64.6%) was the most common. Those with a tubulointerstitial disease had a higher mean age than those with a glomerular disease (p < .001). In cases where nephrectomy was performed for glomerular diseases, IgAN (34.1%) was the most common diagnosis. Conclusions: Kidney disease has been increasing in South Korea for 33 years. Glomerular disease was the most common across all age groups, tubulointerstitial and vascular diseases increased over 60 years.

The Automatable Activity–Based Approach to Complexity Unit Scoring as a task-specific model approach to monetizing outcomes of pathology artificial intelligence solutions: Stavros Pantelakos, Martha Nifora, Georgios Agrogiannis; J Pathol Transl Med. 2025;59(4):225-234. Published online July 3, 2025; DOI: https://doi.org/10.4132/jptm.2025.04.15

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Abstract PDF: Background
Cost-containment policies are increasingly affecting decision-making in healthcare. In this context, the need for monetization of digital health interventions has been recently emphasized. Previous studies have attempted to extrapolate cost containment in conjunction with the implementation of digital pathology solutions mostly on the basis of operational cost savings or diagnostic error reduction. However, no study has attempted to link a wider spectrum of potential diagnostic tasks performed by artificial intelligence algorithms to financial figures.
Methods
Herein, we employ a workload measurement tool for the purpose of monetizing particular outcomes associated with the implementation of a pathology artificial intelligence solution. A hundred and thirty-two prostate core biopsy samples were encoded for workload using the Automatable Activity–Based Approach to Complexity Unit Scoring. Subsequently, avoided workload, full-time equivalent gains, and corresponding cost savings were calculated assuming full clinical deployment of a well-developed prostate cancer screening tool.
Results
For a fixed percentage of negative cores and a steady yearly workload of prostate core biopsies, the estimated total avoided workload amounted to 4,291 complexity units per year, with an average avoidance of 16.25 complexity units per ascension number. The calculated full-time equivalent gains were 0.12, whereas projected cost savings were as high as €2,402.34 per year or €0.55 per complexity unit, which in turn would yield an average of €8.93 per ascension number.
Conclusions
The Automatable Activity–Based Approach to Complexity Unit Scoring appears to be a suitable economic evaluation tool for assessing the possible implementation of task-specific artificial intelligence solutions in a given histopathology laboratory or group of laboratories, considering it is a task-specific workload measurement tool per design.

Reviews

Next step of molecular pathology: next-generation sequencing in cytology: Ricella Souza da Silva, Fernando Schmitt; J Pathol Transl Med. 2024;58(6):291-298. Published online November 7, 2024; DOI: https://doi.org/10.4132/jptm.2024.10.22

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Abstract PDF

The evolving landscape of precision oncology underscores the pivotal shift from morphological diagnosis to treatment decisions driven by molecular profiling. Recent guidelines from the European Society for Medical Oncology recomend the use of next-generation sequencing (NGS) across a broader range of cancers, reflecting its superior efficiency and clinical value. NGS not only updates oncology testing by offering quicker, sample-friendly, and sensitive analysis but also reduces the need for multiple individual tests. Cytology samples, often obtained through less invasive methods, can yield high-quality genetic material suitable for molecular analysis. This article focuses on optimizing the use of cytology samples in NGS, and outlines their potential benefits in identifying actionable molecular alterations for targeted therapies across various solid tumors. It also addresses the need for validation studies and the strategies to incorporate or combine different types of samples into routine clinical practice. Integrating cytological and liquid biopsies into routine clinical practice, alongside conventional tissue biopsies, offers a comprehensive approach to tumor genotyping, early disease detection, and monitoring of therapeutic responses across various solid tumor types. For comprehensive biomarker characterization, all patient specimens, although limited, is always valuable.

Citations

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The World Health Organization Reporting System for Lymph Node, Spleen, and Thymus Cytopathology: Part 1 – Lymph Node
Immacolata Cozzolino, Mats Ehinger, Maria Calaminici, Andrea Ronchi, Mousa A. Al-Abbadi, Helena Barroca, Beata Bode-Lesniewska, David F. Chhieng, Ruth L. Katz, Oscar Lin, L. Jeffrey Medeiros, Martha Bishop Pitman, Arvind Rajwanshi, Fernando C. Schmitt, Ph
Acta Cytologica.2025; : 1. CrossRef
The impact of cytological preparation techniques on RNA quality: A comparative study on smear samples
Cisel Aydin Mericoz, Gulsum Caylak, Elif Sevin Sanioglu, Zeynep Seçil Satilmis, Ayse Humeyra Dur Karasayar, Ibrahim Kulac
Cancer Cytopathology.2025;[Epub] CrossRef
Reimagining cytopathology in the molecular era: Integration or fragmentation?
Sumanta Das, R. Naveen Kumar, Biswajit Dey, Pranjal Kalita
Cytojournal.2025; 22: 94. CrossRef

Diagnosis of interstitial lung diseases: from Averill A. Liebow to artificial intelligence: Eunhee S. Yi, Paul Wawryko, Jay H. Ryu; J Pathol Transl Med. 2024;58(1):1-11. Published online January 10, 2024; DOI: https://doi.org/10.4132/jptm.2023.11.17

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Abstract PDF

Histopathologic criteria of usual interstitial pneumonia (UIP)/idiopathic pulmonary fibrosis (IPF) were defined over the years and endorsed by leading organizations decades after Dr. Averill A. Liebow first coined the term UIP in the 1960s as a distinct pathologic pattern of fibrotic interstitial lung disease. Novel technology and recent research on interstitial lung diseases with genetic component shed light on molecular pathogenesis of UIP/IPF. Two antifibrotic agents introduced in the mid-2010s opened a new era of therapeutic approaches to UIP/IPF, albeit contentious issues regarding their efficacy, side effects, and costs. Recently, the concept of progressive pulmonary fibrosis was introduced to acknowledge additional types of progressive fibrosing interstitial lung diseases with the clinical and pathologic phenotypes comparable to those of UIP/IPF. Likewise, some authors have proposed a paradigm shift by considering UIP as a stand-alone diagnostic entity to encompass other fibrosing interstitial lung diseases that manifest a relentless progression as in IPF. These trends signal a pendulum moving toward the tendency of lumping diagnoses, which poses a risk of obscuring potentially important information crucial to both clinical and research purposes. Recent advances in whole slide imaging for digital pathology and artificial intelligence technology could offer an unprecedented opportunity to enhance histopathologic evaluation of interstitial lung diseases. However, current clinical practice trends of moving away from surgical lung biopsies in interstitial lung disease patients may become a limiting factor in this endeavor as it would be difficult to build a large histopathologic database with correlative clinical data required for artificial intelligence models.

Citations

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Identification of early genes in the pathophysiology of fibrotic interstitial lung disease in a new model of pulmonary fibrosis
Nathan Hennion, Corentin Bedart, Léonie Vandomber, Frédéric Gottrand, Sarah Humez, Cécile Chenivesse, Jean-Luc Desseyn, Valérie Gouyer
Cellular and Molecular Life Sciences.2025;[Epub] CrossRef
Radiological Insights into UIP Pattern: A Comparison Between IPF and Non-IPF Patients
Stefano Palmucci, Miriam Adorna, Angelica Rapisarda, Alessandro Libra, Sefora Fischetti, Gianluca Sambataro, Letizia Antonella Mauro, Emanuele David, Pietro Valerio Foti, Claudia Mattina, Corrado Spatola, Carlo Vancheri, Antonio Basile
Journal of Clinical Medicine.2025; 14(12): 4162. CrossRef

Original Articles

Tumor-infiltrating T lymphocytes evaluated using digital image analysis predict the prognosis of patients with diffuse large B-cell lymphoma: Yunjoo Cho, Jiyeon Lee, Bogyeong Han, Sang Eun Yoon, Seok Jin Kim, Won Seog Kim, Junhun Cho; J Pathol Transl Med. 2024;58(1):12-21. Published online January 10, 2024; DOI: https://doi.org/10.4132/jptm.2023.11.02

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Abstract PDF

Background
The implication of the presence of tumor-infiltrating T lymphocytes (TIL-T) in diffuse large B-cell lymphoma (DLBCL) is yet to be elucidated. We aimed to investigate the effect of TIL-T levels on the prognosis of patients with DLBCL.
Methods
Ninety-six patients with DLBCL were enrolled in the study. The TIL-T ratio was measured using QuPath, a digital pathology software package. The TIL-T ratio was investigated in three foci (highest, intermediate, and lowest) for each case, resulting in TIL-T–Max, TIL-T–Intermediate, and TIL-T–Min. The relationship between the TIL-T ratios and prognosis was investigated.
Results
When 19% was used as the cutoff value for TIL-T–Max, 72 (75.0%) and 24 (25.0%) patients had high and low TIL-T–Max, respectively. A high TIL-T–Max was significantly associated with lower serum lactate dehydrogenase levels (p < .001), with patient group who achieved complete remission after RCHOP therapy (p < .001), and a low-risk revised International Prognostic Index score (p < .001). Univariate analysis showed that patients with a low TIL-T–Max had a significantly worse prognosis in overall survival compared to those with a high TIL-T–Max (p < .001); this difference remained significant in a multivariate analysis with Cox proportional hazards (hazard ratio, 7.55; 95% confidence interval, 2.54 to 22.42; p < .001).
Conclusions
Patients with DLBCL with a high TIL-T–Max showed significantly better prognosis than those with a low TIL-T–Max, and the TIL-T–Max was an independent indicator of overall survival. These results suggest that evaluating TIL-T ratios using a digital pathology system is useful in predicting the prognosis of patients with DLBCL.

Citations

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Do Pre‐Treatment Biopsy Characteristics Predict Early Tumour Progression in Feline Diffuse Large B Cell Nasal Lymphoma Treated With Radiotherapy?
Valerie J. Poirier, Valeria Meier, Michelle Turek, Neil Christensen, Jacqueline Bowal, Matthew D. Ponzini, Stefan M. Keller
Veterinary and Comparative Oncology.2025; 23(1): 82. CrossRef
Comprehensive Analysis of Tumor Microenvironment and PD-L1 Expression Associations with Clinicopathological Features and Prognosis in Diffuse Large B-Cell Lymphoma
Yun-Li Xie, Long-Feng Ke, Wen-Wen Zhang, Fu Kang, Shu-Yi Lu, Chen-Yu Wu, Huan-Huan Zhu, Jian-Chao Wang, Gang Chen, Yan-Ping Chen
Blood and Lymphatic Cancer: Targets and Therapy.2025; Volume 15: 167. CrossRef
Metabolic-immune axis in the tumor microenvironment: a new strategy for prognostic assessment and precision therapy in DLBCL and FL
Chengqian Chen, Wei Guo, Haotian Wang, Luming Cao, Ou Bai
Frontiers in Immunology.2025;[Epub] CrossRef
Integrative analysis of a novel immunogenic PANoptosis‑related gene signature in diffuse large B-cell lymphoma for prognostication and therapeutic decision-making
Ming Xu, Ming Ruan, Wenhua Zhu, Jiayue Xu, Ling Lin, Weili Li, Weirong Zhu
Scientific Reports.2024;[Epub] CrossRef

Establishing molecular pathology curriculum for pathology trainees and continued medical education: a collaborative work from the Molecular Pathology Study Group of the Korean Society of Pathologists: Jiwon Koh, Ha Young Park, Jeong Mo Bae, Jun Kang, Uiju Cho, Seung Eun Lee, Haeyoun Kang, Min Eui Hong, Jae Kyung Won, Youn-La Choi, Wan-Seop Kim, Ahwon Lee; J Pathol Transl Med. 2023;57(5):265-272. Published online September 15, 2023; DOI: https://doi.org/10.4132/jptm.2023.08.26

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Abstract PDF

Background
The importance of molecular pathology tests has increased during the last decade, and there is a great need for efficient training of molecular pathology for pathology trainees and as continued medical education.
Methods
The Molecular Pathology Study Group of the Korean Society of Pathologists appointed a task force composed of experienced molecular pathologists to develop a refined educational curriculum of molecular pathology. A 3-day online educational session was held based on the newly established structure of learning objectives; the audience were asked to score their understanding of 22 selected learning objectives before and after the session to assess the effect of structured education.
Results
The structured objectives and goals of molecular pathology was established and posted as a web-based interface which can serve as a knowledge bank of molecular pathology. A total of 201 pathologists participated in the educational session. For all 22 learning objectives, the scores of self-reported understanding increased after educational session by 9.9 points on average (range, 6.6 to 17.0). The most effectively improved items were objectives from next-generation sequencing (NGS) section: ‘NGS library preparation and quality control’ (score increased from 51.8 to 68.8), ‘NGS interpretation of variants and reference database’ (score increased from 54.1 to 68.0), and ‘whole genome, whole exome, and targeted gene sequencing’ (score increased from 58.2 to 71.2). Qualitative responses regarding the adequacy of refined educational curriculum were collected, where favorable comments dominated.
Conclusions
Approach toward the education of molecular pathology was refined, which would greatly benefit the future trainees.

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Presence of RB1 or Absence of LRP1B Mutation Predicts Poor Overall Survival in Patients with Gastric Neuroendocrine Carcinoma and Mixed Adenoneuroendocrine Carcinoma
In Hye Song, Bokyung Ahn, Young Soo Park, Deok Hoon Kim, Seung-Mo Hong
Cancer Research and Treatment.2025; 57(2): 492. CrossRef

Diagnostic proficiency test using digital cytopathology and comparative assessment of whole slide images of cytologic samples for quality assurance program in Korea: Yosep Chong, Soon Auck Hong, Hoon Kyu Oh, Soo Jin Jung, Bo-Sung Kim, Ji Yun Jeong, Ho-Chang Lee, Gyungyub Gong; J Pathol Transl Med. 2023;57(5):251-264. Published online August 24, 2023; DOI: https://doi.org/10.4132/jptm.2023.07.17

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Abstract PDF Supplementary Material

Background
The Korean Society for Cytopathology introduced a digital proficiency test (PT) in 2021. However, many doubtful opinions remain on whether digitally scanned images can satisfactorily present subtle differences in the nuclear features and chromatin patterns of cytological samples.
Methods
We prepared 30 whole-slide images (WSIs) from the conventional PT archive by a selection process for digital PT. Digital and conventional PT were performed in parallel for volunteer institutes, and the results were compared using feedback. To assess the quality of cytological assessment WSIs, 12 slides were collected and scanned using five different scanners, with four cytopathologists evaluating image quality through a questionnaire.
Results
Among the 215 institutes, 108 and 107 participated in glass and digital PT, respectively. No significant difference was noted in category C (major discordance), although the number of discordant cases was slightly higher in the digital PT group. Leica, 3DHistech Pannoramic 250 Flash, and Hamamatsu NanoZoomer 360 systems showed comparable results in terms of image quality, feature presentation, and error rates for most cytological samples. Overall satisfaction was observed with the general convenience and image quality of digital PT.
Conclusions
As three-dimensional clusters are common and nuclear/chromatin features are critical for cytological interpretation, careful selection of scanners and optimal conditions are mandatory for the successful establishment of digital quality assurance programs in cytology.

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Sensitivity, Specificity, and Cost–Benefit Effect Between Primary Human Papillomavirus Testing, Primary Liquid‐Based Cytology, and Co‐Testing Algorithms for Cervical Lesions
Chang Gok Woo, Seung‐Myoung Son, Hye‐Kyung Hwang, Jung‐Sil Bae, Ok‐Jun Lee, Ho‐Chang Lee
Diagnostic Cytopathology.2025; 53(1): 35. CrossRef
Integration of AI‐Assisted in Digital Cervical Cytology Training: A Comparative Study
Yihui Yang, Dongyi Xian, Lihua Yu, Yanqing Kong, Huaisheng Lv, Liujing Huang, Kai Liu, Hao Zhang, Weiwei Wei, Hongping Tang
Cytopathology.2025; 36(2): 156. CrossRef
National quality assurance program using digital cytopathology: a 5-year digital transformation experience by the Korean Society for Cytopathology
Yosep Chong, Hyeong Ju Kwon, Soon Auck Hong, Sung Soon Kim, Bo-Sung Kim, Younghee Choi, Yoon Jung Choi, Jung-Soo Pyo, Ji Yun Jeong, Soo Jin Jung, Hoon Kyu Oh, Seung-Sook Lee
Journal of Pathology and Translational Medicine.2025; 59(5): 320. CrossRef
Integration of Digital Cytology in Quality Assurance Programs for Cytopathology
Yosep Chong, Maria Jesús Fernández Aceñero, Zaibo Li, Andrey Bychkov
Acta Cytologica.2025; : 1. CrossRef
Practice of Cytopathology in Korea: A 40‐Year Evolution Through Standardization, Digital Transformation, and Global Partnership
Yosep Chong, Ran Hong, Hyeong Ju Kwon, Haeryoung Kim, Lucia Kim, Soon Jae Kim, Yoon Jung Choi
Diagnostic Cytopathology.2025;[Epub] CrossRef
Quantitative Assessment of Focus Quality in Whole-Slide Imaging of Thyroid Liquid-Based Cytology Using Laplacian Variance
Chan Kwon Jung, Chankyung Kim, Sora Jeon, Andrey Bychkov
Endocrine Pathology.2025;[Epub] CrossRef
Validation of digital image slides for diagnosis in cervico-vaginal cytology
Francisco Tresserra, Gemma Fabra, Olga Luque, Miriam Castélla, Carla Gómez, Carmen Fernández-Cid, Ignacio Rodríguez
Revista Española de Patología.2024; 57(3): 182. CrossRef
Improved Diagnostic Accuracy of Thyroid Fine-Needle Aspiration Cytology with Artificial Intelligence Technology
Yujin Lee, Mohammad Rizwan Alam, Hongsik Park, Kwangil Yim, Kyung Jin Seo, Gisu Hwang, Dahyeon Kim, Yeonsoo Chung, Gyungyub Gong, Nam Hoon Cho, Chong Woo Yoo, Yosep Chong, Hyun Joo Choi
Thyroid®.2024; 34(6): 723. CrossRef

Single-center study on clinicopathological and typical molecular pathologic features of metastatic brain tumor: Su Hwa Kim, Young Suk Lee, Sung Hak Lee, Yeoun Eun Sung, Ahwon Lee, Jun Kang, Jae-Sung Park, Sin Soo Jeun, Youn Soo Lee; J Pathol Transl Med. 2023;57(4):217-231. Published online July 11, 2023; DOI: https://doi.org/10.4132/jptm.2023.06.10

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Abstract PDF

Background
The metastatic brain tumor is the most common brain tumor. The aim of this study was to demonstrate the clinicopathological and molecular pathologic features of brain metastases (BM).
Methods
A total of 269 patients were diagnosed with BM through surgical resection at Seoul St. Mary’s Hospital from January 2010 to March 2020. We reviewed the clinicopathological features and molecular status of primary and metastatic brain tissues using immunohistochemistry and molecular pathology results.
Results
Among 269 patients, 139 males and 130 females were included. The median age of primary tumor was 58 years (range, 13 to 87 years) and 86 patients (32.0%) had BM at initial presentation. Median BM free interval was 28.0 months (range, 1 to 286 months). The most frequent primary site was lung 46.5% (125/269), and followed by breast 15.6% (42/269), colorectum 10.0% (27/269). Epidermal growth factor receptor (EGFR) mutation was found in 50.8% (32/63) and 58.0% (40/69) of lung primary and BM, respectively. In both breast primary and breast cancer with BM, luminal B was the most frequent subtype at 37.9% (11/29) and 42.9% (18/42), respectively, followed by human epidermal growth factor receptor 2 with 31.0% (9/29) and 33.3% (14/42). Triple-negative was 20.7% (6/29) and 16.7% (7/42), and luminal A was 10.3% (3/29) and 7.1% (3/42) of breast primary and BM, respectively. In colorectal primary and colorectal cancer with BM, KRAS mutation was found in 76.9% (10/13) and 66.7% (2/3), respectively.
Conclusions
We report the clinicopathological and molecular pathologic features of BM that can provide useful information for understanding the pathogenesis of metastasis and for clinical trials based on the tumor’s molecular pathology.

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Colorectal cancer metastasis to the brain: A scoping review of incidence, treatment, and outcomes
Hunter J Hutchinson, Melanie Gonzalez, Diana Feier, Colin E Welch, Brandon Lucke-Wold
World Journal of Gastrointestinal Pathophysiology.2025;[Epub] CrossRef

Case Study

Thyroid pathology, a clue to PTEN hamartoma tumor syndrome: Yurimi Lee, Young Lyun Oh; J Pathol Transl Med. 2023;57(3):178-183. Published online March 30, 2023; DOI: https://doi.org/10.4132/jptm.2023.03.04

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Abstract PDF

Phosphatase and tensin homolog (PTEN) hamartoma tumor syndrome (PHTS) is a hereditary disorder caused by germline inactivating mutations in the PTEN tumor suppressor gene. As a type of PHTS, Cowden syndrome is associated with abnormalities of the thyroid, breast, uterus, and gastrointestinal tract. A 52-year-old-woman visited the outpatient clinic of our endocrinology clinic with multiple thyroid nodules and Hashimoto's thyroiditis. Computed tomography imaging revealed a multinodular mass measuring up to 3.5 cm in the left thyroid lobe, causing laryngotracheal airway displacement. The total thyroidectomy specimen revealed multiple follicular adenomas and adenomatous nodules with lymphocytic thyroiditis and lipomatous metaplasia in the background. The patient was suspected of PTHS based on her thyroid pathology, family history, and numerous hamartomatous lesions of the breast, uterus, and skin. Her diagnosis was confirmed through molecular testing. This case demonstrates that pathologists must be well acquainted with thyroid pathology in PHTS.

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Original Article

Current state of cytopathology residency training: a Korean national survey of pathologists: Uiju Cho, Tae Jung Kim, Wan Seop Kim, Kyo Young Lee, Hye Kyoung Yoon, Hyun Joo Choi; J Pathol Transl Med. 2023;57(2):95-101. Published online March 14, 2023; DOI: https://doi.org/10.4132/jptm.2023.01.06

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Background
Although the Korean Society for Cytopathology has developed educational goals as guidelines for cytopathology education in Korea, there is still no systematic approach to cytopathology education status for pathology residents. Furthermore, satisfaction with cytopathology education and with the outcome of the current training/educational program has not been investigated in Korea. This study aimed to obtain comprehensive data on the current state of cytopathology education for residents and evaluate education outcomes.
Methods
An online survey was conducted in December 2020 for the board-certified pathologists and training residents registered as members of the Korean Society for Cytopathology. The questionnaire comprised questions that investigated the current status of cytopathology at each training institution, the degree of satisfaction with the work and education related to cytopathology, outcomes of cytopathology training, and educational accomplishments.
Results
Of the participants surveyed, 12.3% (132/1,075) completed the questionnaire, and 36.8% (32/87) of cytopathology residents participated. The mean overall satisfaction with cytopathology education was 3.1 points (on a 1- to 5-point scale, 5: very satisfied). The most frequent suggestion among the free description format responses was to expand educational opportunities, such as online education opportunities, outside of the individual institutions.
Conclusions
Our results showed that cytopathology training in Korea needs further improvement. We expect that this study will inform systematic training of competent medical personnel armed with broad cytopathology knowledge and strong problem-solving abilities.

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Seung-Yeon Yoo, Yuri Hwang, Seokju Yun, Ok Hee Lee, Jiwook Jang, Youngjin Park, Tae Young Cho, Young Sin Ko
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Reviews

A standardized pathology report for gastric cancer: 2nd edition: Young Soo Park, Myeong-Cherl Kook, Baek-hui Kim, Hye Seung Lee, Dong-Wook Kang, Mi-Jin Gu, Ok Ran Shin, Younghee Choi, Wonae Lee, Hyunki Kim, In Hye Song, Kyoung-Mee Kim, Hee Sung Kim, Guhyun Kang, Do Youn Park, So-Young Jin, Joon Mee Kim, Yoon Jung Choi, Hee Kyung Chang, Soomin Ahn, Mee Soo Chang, Song-Hee Han, Yoonjin Kwak, An Na Seo, Sung Hak Lee, Mee-Yon Cho; J Pathol Transl Med. 2023;57(1):1-27. Published online January 15, 2023; DOI: https://doi.org/10.4132/jptm.2022.12.23

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The first edition of ‘A Standardized Pathology Report for Gastric Cancer’ was initiated by the Gastrointestinal Pathology Study Group of the Korean Society of Pathologists and published 17 years ago. Since then, significant advances have been made in the pathologic diagnosis, molecular genetics, and management of gastric cancer (GC). To reflect those changes, a committee for publishing a second edition of the report was formed within the Gastrointestinal Pathology Study Group of the Korean Society of Pathologists. This second edition consists of two parts: standard data elements and conditional data elements. The standard data elements contain the basic pathologic findings and items necessary to predict the prognosis of GC patients, and they are adequate for routine surgical pathology service. Other diagnostic and prognostic factors relevant to adjuvant therapy, including molecular biomarkers, are classified as conditional data elements to allow each pathologist to selectively choose items appropriate to the environment in their institution. We trust that the standardized pathology report will be helpful for GC diagnosis and facilitate large-scale multidisciplinary collaborative studies.

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Single-cell and spatial sequencing application in pathology: Yoon-Seob Kim, Jinyong Choi, Sug Hyung Lee; J Pathol Transl Med. 2023;57(1):43-51. Published online January 10, 2023; DOI: https://doi.org/10.4132/jptm.2022.12.12

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Abstract PDF

Traditionally, diagnostic pathology uses histology representing structural alterations in a disease’s cells and tissues. In many cases, however, it is supplemented by other morphology-based methods such as immunohistochemistry and fluorescent in situ hybridization. Single-cell RNA sequencing (scRNA-seq) is one of the strategies that may help tackle the heterogeneous cells in a disease, but it does not usually provide histologic information. Spatial sequencing is designed to assign cell types, subtypes, or states according to the mRNA expression on a histological section by RNA sequencing. It can provide mRNA expressions not only of diseased cells, such as cancer cells but also of stromal cells, such as immune cells, fibroblasts, and vascular cells. In this review, we studied current methods of spatial transcriptome sequencing based on their technical backgrounds, tissue preparation, and analytic procedures. With the pathology examples, useful recommendations for pathologists who are just getting started to use spatial sequencing analysis in research are provided here. In addition, leveraging spatial sequencing by integration with scRNA-seq is reviewed. With the advantages of simultaneous histologic and single-cell information, spatial sequencing may give a molecular basis for pathological diagnosis, improve our understanding of diseases, and have potential clinical applications in prognostics and diagnostic pathology.

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Original Articles

Development of quality assurance program for digital pathology by the Korean Society of Pathologists: Yosep Chong, Jeong Mo Bae, Dong Wook Kang, Gwangil Kim, Hye Seung Han; J Pathol Transl Med. 2022;56(6):370-382. Published online November 15, 2022; DOI: https://doi.org/10.4132/jptm.2022.09.30

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Abstract PDF Supplementary Material

Background
Digital pathology (DP) using whole slide imaging is a recently emerging game changer technology that can fundamentally change the way of working in pathology. The Digital Pathology Study Group (DPSG) of the Korean Society of Pathologists (KSP) published a consensus report on the recommendations for pathologic practice using DP. Accordingly, the need for the development and implementation of a quality assurance program (QAP) for DP has been raised.
Methods
To provide a standard baseline reference for internal and external QAP for DP, the members of the Committee of Quality Assurance of the KSP developed a checklist for the Redbook and a QAP trial for DP based on the prior DPSG consensus report. Four leading institutes participated in the QAP trial in the first year, and we gathered feedback from these institutes afterwards.
Results
The newly developed checklists of QAP for DP contain 39 items (216 score): eight items for quality control of DP systems; three for DP personnel; nine for hardware and software requirements for DP systems; 15 for validation, operation, and management of DP systems; and four for data security and personal information protection. Most participants in the QAP trial replied that continuous education on unfamiliar terminology and more practical experience is demanding.
Conclusions
The QAP for DP is essential for the safe implementation of DP in pathologic practice. Each laboratory should prepare an institutional QAP according to this checklist, and consecutive revision of the checklist with feedback from the QAP trial for DP needs to follow.

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An equivalency and efficiency study for one year digital pathology for clinical routine diagnostics in an accredited tertiary academic center
Viola Iwuajoku, Kübra Ekici, Anette Haas, Mohammed Zaid Khan, Azar Kazemi, Atsuko Kasajima, Claire Delbridge, Alexander Muckenhuber, Elisa Schmoeckel, Fabian Stögbauer, Christine Bollwein, Kristina Schwamborn, Katja Steiger, Carolin Mogler, Peter J. Schüf
Virchows Archiv.2025; 487(1): 3. CrossRef
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Miklós Vincze, Béla Molnár, Miklós Kozlovszky
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Yosep Chong, Maria Jesús Fernández Aceñero, Zaibo Li, Andrey Bychkov
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Diagnostic proficiency test using digital cytopathology and comparative assessment of whole slide images of cytologic samples for quality assurance program in Korea
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Diagnostic distribution and pitfalls of glandular abnormalities in cervical cytology: a 25-year single-center study: Jung-A Sung, Ilias P. Nikas, Haeryoung Kim, Han Suk Ryu, Cheol Lee; J Pathol Transl Med. 2022;56(6):354-360. Published online November 9, 2022; DOI: https://doi.org/10.4132/jptm.2022.09.05

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Abstract PDF

Background
Detection of glandular abnormalities in Papanicolaou (Pap) tests is challenging. This study aimed to review our institute’s experience interpreting such abnormalities, assess cytohistologic concordance, and identify cytomorphologic features associated with malignancy in follow-up histology.
Methods
Patients with cytologically-detected glandular lesions identified in our pathology records from 1995 to 2020 were included in this study.
Results
Of the 683,197 Pap tests performed, 985 (0.144%) exhibited glandular abnormalities, 657 of which had tissue follow-up available. One hundred eighty-eight cases were cytologically interpreted as adenocarcinoma and histologically diagnosed as malignant tumors of various origins. There were 213 cases reported as atypical glandular cells (AGC) and nine cases as adenocarcinoma in cytology, yet they were found to be benign in follow-up histology. In addition, 48 cases diagnosed with AGC and six with adenocarcinoma cytology were found to have cervical squamous lesions in follow-up histology, including four squamous cell carcinomas. Among the cytomorphological features examined, nuclear membrane irregularity, three-dimensional clusters, single-cell pattern, and presence of mitoses were associated with malignant histology in follow-up.
Conclusions
This study showed our institute’s experience detecting glandular abnormalities in cervical cytology over a 25-year period, revealing the difficulty of this task. Nonetheless, the present study indicates that several cytological findings such as membrane irregularity, three-dimensional clusters, single-cell pattern, and evidence of proliferation could help distinguishing malignancy from a benign lesion.

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Review

Neuropathologic features of central nervous system hemangioblastoma: Rebecca A. Yoda, Patrick J. Cimino; J Pathol Transl Med. 2022;56(3):115-125. Published online May 3, 2022; DOI: https://doi.org/10.4132/jptm.2022.04.13

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Abstract PDF

Hemangioblastoma is a benign, highly vascularized neoplasm of the central nervous system (CNS). This tumor is associated with loss of function of the VHL gene and demonstrates frequent occurrence in von Hippel-Lindau (VHL) disease. While this entity is designated CNS World Health Organization grade 1, due to its predilection for the cerebellum, brainstem, and spinal cord, it is still an important cause of morbidity and mortality in affected patients. Recognition and accurate diagnosis of hemangioblastoma is essential for the practice of surgical neuropathology. Other CNS neoplasms, including several tumors associated with VHL disease, may present as histologic mimics, making diagnosis challenging. We outline key clinical and radiologic features, pathophysiology, treatment modalities, and prognostic information for hemangioblastoma, and provide a thorough review of the gross, microscopic, immunophenotypic, and molecular features used to guide diagnosis.

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Original Article

Clinicopathologic features and survival outcomes of ocular melanoma: a series of 31 cases from a tertiary university hospital: Selin Kestel, Feriha Pınar Uyar Göçün, Betül Öğüt, Özlem Erdem; J Pathol Transl Med. 2022;56(4):187-198. Published online May 3, 2022; DOI: https://doi.org/10.4132/jptm.2022.03.10

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Background
We aimed to determine the effect of clinicopathologic features on overall survival among Caucasian ocular melanoma patients in the Central Anatolia region of Turkey.
Methods
This single-center study included conjunctival (n = 12) and uveal (n = 19) melanoma patients diagnosed between January 2008 and March 2020. Clinicopathologic features and outcomes were reviewed retrospectively. Five cases were tested for BRAF V600 mutations with real-time polymerase chain reaction, and one case was tested with nextgeneration sequencing. Survival was calculated using the Kaplan-Meier method.
Results
Thirty-one patients had a mean initial age of 58.32 years (median, 61 years; range 25 to 78 years). There were 13 male and 18 female patients. The median follow-up time was 43.5 months (range, 6 to 155 months) for conjunctival melanoma and 35 months (range, 8 to 151 months) for uveal melanoma. When this study ended, eight of the 12 conjunctival melanoma patients (66.7%) and nine of the 19 uveal melanoma patients (47.4%) had died. The presence of tumor-infiltrating lymphocytes was related to improved overall survival in conjunctival melanoma (p = .014), whereas the presence of ulceration (p = .030), lymphovascular invasion (p = .051), tumor in the left eye (p = .012), tumor thickness of > 2 mm (p = .012), and mitotic count of >1/mm² (p = .012) reduced the overall survival in conjunctival melanoma. Uveal melanoma tumors with the largest diameter of 9.1–15 mm led to the lowest overall survival among subgroups (p = .035). Involvement of the conjunctiva (p=.005) and lens (p = .003) diminished overall survival in uveal melanoma. BRAF V600 mutation was present in one case of conjunctival melanoma, GNAQ R183Q mutation was present in one case of uveal melanoma. Patients with uveal melanoma presented with an advanced pathological tumor stage compared to those with conjunctival melanoma (p = .019).
Conclusions
This study confirmed the presence of tumor-infiltrating lymphocytes as a favorable factor in conjunctival melanoma and conjunctival and lens involvement as unfavorable prognostic factors in uveal melanoma for overall survival, respectively.

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Toward Precision Medicine: Gene Therapy Applications in the Management of Uveal Melanoma
Alireza Azani, Vahid Ghassemifar, Zahra Mehrdad, Maryam Saberivand, Anahid Bagheripour, Safa Tahmasebi, Hossein Gharedaghi, Malihe Sharafi, Hassan Foroozand, Mohammad Saeed Soleimani Meigoli, Saba Pourali, Arash Salmaninejad, Faeze Ahmadi Beni, Qumars Beh
Cancer Reports.2025;[Epub] CrossRef
Uveal melanoma in the Iranian population: two decades of patient management in a tertiary eye center
Hamid Riazi-Esfahani, Abdulrahim Amini, Babak Masoomian, Mehdi Yaseri, Siamak Sabour, Ali Rashidinia, Mojtaba Arjmand, Seyed Mohsen Rafizadeh, Mohammadkarim Johari, Elias Khalili Pour, Fariba Ghassemi
International Journal of Retina and Vitreous.2024;[Epub] CrossRef
Clinical features and prognosis of patients with metastatic ocular and orbital melanoma: A bi‐institutional study
Xin Liu, Han Yue, Shiyu Jiang, Lin Kong, Yu Xu, Yong Chen, Chunmeng Wang, Yan Wang, Xiaoli Zhu, Yunyi Kong, Xiaowei Zhang, Jiang Qian, Zhiguo Luo
Cancer Medicine.2023; 12(15): 16163. CrossRef
Metastatic melanoma: clinicopathologic features and overall survival comparison
Selin Kestel, Feriha Pınar Uyar Göçün, Betül Öğüt, Özlem Erdem
Acta Dermatovenerologica Alpina Pannonica et Adriatica.2022;[Epub] CrossRef

Review

Hepatocellular adenomas: recent updates: Haeryoung Kim, Young Nyun Park; J Pathol Transl Med. 2021;55(3):171-180. Published online April 7, 2021; DOI: https://doi.org/10.4132/jptm.2021.02.27

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Abstract PDF

Hepatocellular adenoma (HCA) is a heterogeneous entity, from both the histomorphological and molecular aspects, and the resultant subclassification has brought a strong translational impact for both pathologists and clinicians. In this review, we provide an overview of the recent updates on HCA from the pathologists’ perspective and discuss several practical issues and pitfalls that may be useful for diagnostic practice.

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Original Article

Deep learning for computer-assisted diagnosis of hereditary diffuse gastric cancer: Sean A. Rasmussen, Thomas Arnason, Weei-Yuarn Huang; J Pathol Transl Med. 2021;55(2):118-124. Published online January 22, 2021; DOI: https://doi.org/10.4132/jptm.2020.12.22

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Abstract PDF

Background
Patients with hereditary diffuse gastric cancer often undergo prophylactic gastrectomy to minimize cancer risk. Because intramucosal poorly cohesive carcinomas in this setting are typically not grossly visible, many pathologists assess the entire gastrectomy specimen microscopically. With 150 or more slides per case, this is a major time burden for pathologists. This study utilizes deep learning methods to analyze digitized slides and detect regions of carcinoma.
Methods
Prophylactic gastrectomy specimens from seven patients with germline CDH1 mutations were analyzed (five for training/validation and two for testing, with a total of 133 tumor foci). All hematoxylin and eosin slides containing cancer foci were digitally scanned, and patches of size 256×256 pixels were randomly extracted from regions of cancer as well as from regions of normal background tissue, resulting in 15,851 images for training/validation and 970 images for testing. A model with DenseNet-169 architecture was trained for 150 epochs, then evaluated on images from the test set. External validation was conducted on 814 images scanned at an outside institution.
Results
On individual patches, the trained model achieved a receiver operating characteristic (ROC) area under the curve (AUC) of 0.9986. This enabled it to maintain a sensitivity of 90% with a false-positive rate of less than 0.1%. On the external validation dataset, the model achieved a similar ROC AUC of 0.9984. On whole slide images, the network detected 100% of tumor foci and correctly eliminated an average of 99.9% of the non-cancer slide area from consideration.
Conclusions
Overall, our model shows encouraging progress towards computer-assisted diagnosis of hereditary diffuse gastric cancer.

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Reviews

Standardized pathology report for breast cancer: Soo Youn Cho, So Yeon Park, Young Kyung Bae, Jee Yeon Kim, Eun Kyung Kim, Woo Gyeong Kim, Youngmee Kwon, Ahwon Lee, Hee Jin Lee, Ji Shin Lee, Jee Young Park, Gyungyub Gong, Hye Kyoung Yoon; J Pathol Transl Med. 2021;55(1):1-15. Published online January 11, 2021; DOI: https://doi.org/10.4132/jptm.2020.11.20

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Abstract PDF Supplementary Material

Given the recent advances in management and understanding of breast cancer, a standardized pathology report reflecting these changes is critical. To meet this need, the Breast Pathology Study Group of the Korean Society of Pathologists has developed a standardized pathology reporting format for breast cancer, consisting of ‘standard data elements,’ ‘conditional data elements,’ and a biomarker report form. The ‘standard data elements’ consist of the basic pathologic features used for prognostication, while other factors related to prognosis or diagnosis are described in the ‘conditional data elements.’ In addition to standard data elements, all recommended issues are also presented. We expect that this standardized pathology report for breast cancer will improve diagnostic concordance and communication between pathologists and clinicians, as well as between pathologists inter-institutionally.

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Recommendations for pathologic practice using digital pathology: consensus report of the Korean Society of Pathologists: Yosep Chong, Dae Cheol Kim, Chan Kwon Jung, Dong-chul Kim, Sang Yong Song, Hee Jae Joo, Sang-Yeop Yi; J Pathol Transl Med. 2020;54(6):437-452. Published online October 8, 2020; DOI: https://doi.org/10.4132/jptm.2020.08.27

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Abstract PDF Supplementary Material

Digital pathology (DP) using whole slide imaging (WSI) is becoming a fundamental issue in pathology with recent advances and the rapid development of associated technologies. However, the available evidence on its diagnostic uses and practical advice for pathologists on implementing DP remains insufficient, particularly in light of the exponential growth of this industry. To inform DP implementation in Korea, we developed relevant and timely recommendations. We first performed a literature review of DP guidelines, recommendations, and position papers from major countries, as well as a review of relevant studies validating WSI. Based on that information, we prepared a draft. After several revisions, we released this draft to the public and the members of the Korean Society of Pathologists through our homepage and held an open forum for interested parties. Through that process, this final manuscript has been prepared. This recommendation contains an overview describing the background, objectives, scope of application, and basic terminology; guidelines and considerations for the hardware and software used in DP systems and the validation required for DP implementation; conclusions; and references and appendices, including literature on DP from major countries and WSI validation studies.

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Pathologic interpretation of endoscopic ultrasound–guided fine needle aspiration cytology/biopsy for pancreatic lesions: Haeryoung Kim, Kee-Taek Jang; J Pathol Transl Med. 2020;54(5):367-377. Published online August 31, 2020; DOI: https://doi.org/10.4132/jptm.2020.07.21

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Abstract PDF

Pathologic interpretation of endoscopic ultrasound–guided fine needle aspiration (EUS-FNA) cytology/biopsy specimens is one of the most challenging tasks in cytology and surgical pathology practice, as the procedure often yields minimal amounts of diagnostic material and contains contaminants, such as blood cells and normal intestinal mucosa. EUS-FNA cytology/biopsy will nevertheless become a more popular procedure for evaluation of various pancreatic lesions because they are difficult to approach with conventional endoscopic procedures. Pathologists should understand the structural differences and limitations of EUS-FNA that make pathologic diagnosis difficult. Ancillary tests are available for differential diagnosis of EUS-FNA for various pancreatic lesions. Immunostains are the most commonly used ancillary tests, and pathologists should able to choose the necessary panel for differential diagnosis. Pathologists should review clinical history and radiologic and/or EUS findings before selecting an immunostain panel and making a pathologic diagnosis. In addition, one’s threshold of malignancy should be adjusted according to the appropriate clinical setting to avoid under-evaluation of pathologic diagnoses. Clinico-pathologic correlation is essential in pathologic evaluation of EUS-FNA for pancreatic lesions. Pathologists can reduce errors by correlating clinical and radiologic findings when evaluating EUS-FNA. Some molecular tests can be applied in differential diagnosis of pancreatic neoplastic and cystic lesions. Molecular data should be used as supportive evidence of a specific disease entity, rather than direct evidence, and should be correlated with clinico-pathologic findings to avoid errors in pathologic diagnosis.

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Original Article

A retrospective cytohistological correlation of fine-needle aspiration cytology with classification by the Milan System for Reporting Salivary Gland Cytopathology: Ji Hyun Park, Yoon Jin Cha, Ja Yeong Seo, Jae Yol Lim, Soon Won Hong; J Pathol Transl Med. 2020;54(5):419-425. Published online July 8, 2020; DOI: https://doi.org/10.4132/jptm.2020.06.09

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Abstract PDF

Background
Before publication of the new classification system named the Milan System for Reporting Salivary Gland Cytopathology (MSRSGC) in 2018, there was no standard classification for salivary gland lesions obtained by fine-needle aspiration (FNA). We therefore aimed to evaluate the diagnostic utility of this system by retrospectively reviewing FNA samples using the MSRSGC and to determine their risk of developing into neoplasms and becoming malignant.
Methods
Retrospective slide review and classification of salivary gland FNAs obtained over a 6-year period (2013–2018) at a single center were performed by two pathologists. The risks of neoplasm and malignancy for each category also were calculated.
Results
This study surveyed 374 FNAs (371 patients) performed over a six-year period and selected 148 cases that included documented surgical follow-up (39.6%). Among the surgically treated cases, the distributions of FNA categories were as follows: non-diagnostic (ND; 16.9%), non-neoplastic (NN; 2.7%), atypia of undetermined significance (AUS; 3.4%), benign (BN; 54.7%), salivary gland neoplasm of uncertain malignant potential (SUMP; 10.1%), suspicious for malignancy (SM; 6.8%), and malignant (M; 5.4%). The risk of malignancy (ROM) was 24.0% for ND, 0% for NN, 40.0% for AUS, 2.5% for BN, 46.7% for SUMP, 100% for SM, and 87.5% for M. The overall diagnostic accuracy was 95.9% (142/148 cases).
Conclusions
The newly proposed MSRSGC appears to be a reliable system for classification of salivary gland lesions according to the associated ROM.

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Case Study

Appendiceal actinomycosis mimicking appendiceal tumor, appendicitis or inflammatory bowel disease: You-Na Sung, Jihun Kim; J Pathol Transl Med. 2021;55(5):349-354. Published online June 26, 2020; DOI: https://doi.org/10.4132/jptm.2020.05.17

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Abstract PDF

Appendiceal actinomycosis is very rare and its diagnosis is often difficult even in surgically resected specimens. Here we report two cases of appendiceal actinomycosis confirmed by pathologic examination of surgically resected specimens. Characteristic histologic features included transmural chronic inflammation with Crohn-like lymphoid aggregates and polypoid mucosal protrusion into cecal lumen through fibrous expansion of the submucosa. Chronic active inflammation involved the mucosa of the appendix and cecum around the appendiceal orifice. Crohn’s disease with predominant cecal involvement and inflammatory pseudotumor were considered as differential diagnoses. Careful examination revealed a few actinomycotic colonies in the mucosa, confirming the diagnosis. A high index of suspicion with awareness of the characteristic histologic features might prompt careful inspection for the actinomycotic colonies, leading to the appropriate diagnosis of this rare disease.

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Introduction to digital pathology and computer-aided pathology: Soojeong Nam, Yosep Chong, Chan Kwon Jung, Tae-Yeong Kwak, Ji Youl Lee, Jihwan Park, Mi Jung Rho, Heounjeong Go; J Pathol Transl Med. 2020;54(2):125-134. Published online February 13, 2020; DOI: https://doi.org/10.4132/jptm.2019.12.31

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Abstract PDF

Digital pathology (DP) is no longer an unfamiliar term for pathologists, but it is still difficult for many pathologists to understand the engineering and mathematics concepts involved in DP. Computer-aided pathology (CAP) aids pathologists in diagnosis. However, some consider CAP a threat to the existence of pathologists and are skeptical of its clinical utility. Implementation of DP is very burdensome for pathologists because technical factors, impact on workflow, and information technology infrastructure must be considered. In this paper, various terms related to DP and computer-aided pathologic diagnosis are defined, current applications of DP are discussed, and various issues related to implementation of DP are outlined. The development of computer-aided pathologic diagnostic tools and their limitations are also discussed.

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Standardized Pathology Report for Colorectal Cancer, 2nd Edition: Baek-hui Kim, Joon Mee Kim, Gyeong Hoon Kang, Hee Jin Chang, Dong Wook Kang, Jung Ho Kim, Jeong Mo Bae, An Na Seo, Ho Sung Park, Yun Kyung Kang, Kyung-Hwa Lee, Mee Yon Cho, In-Gu Do, Hye Seung Lee, Hee Kyung Chang, Do Youn Park, Hyo Jeong Kang, Jin Hee Sohn, Mee Soo Chang, Eun Sun Jung, So-Young Jin, Eunsil Yu, Hye Seung Han, Youn Wha Kim; J Pathol Transl Med. 2020;54(1):1-19. Published online November 13, 2019; DOI: https://doi.org/10.4132/jptm.2019.09.28

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The first edition of the ‘Standardized Pathology Report for Colorectal Cancer,’ which was developed by the Gastrointestinal Pathology Study Group (GIP) of the Korean Society of Pathologists, was published 13 years ago. Meanwhile, there have been many changes in the pathologic diagnosis of colorectal cancer (CRC), pathologic findings included in the pathology report, and immunohistochemical and molecular pathology required for the diagnosis and treatment of colorectal cancer. In order to reflect these changes, we (GIP) decided to make the second edition of the report. The purpose of this standardized pathology report is to provide a practical protocol for Korean pathologists, which could help diagnose and treat CRC patients. This report consists of “standard data elements” and “conditional data elements.” Basic pathologic findings and parts necessary for prognostication of CRC patients are classified as “standard data elements,” while other prognostic factors and factors related to adjuvant therapy are classified as “conditional data elements” so that each institution could select the contents according to the characteristics of the institution. The Korean version is also provided separately so that Korean pathologists can easily understand and use this report. We hope that this report will be helpful in the daily practice of CRC diagnosis.

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How to Foster Professional Values during Pathology Residency: Yong-Jin Kim; J Pathol Transl Med. 2019;53(4):207-209. Published online June 27, 2019; DOI: https://doi.org/10.4132/jptm.2019.06.12

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Abstract PDF

The importance of professional and ethical behavior by physicians both in training and in practice cannot be overemphasized, particularly in pathology. Professionalism education begins in medical school, and professional attitudes and behaviors are further internalized during residency. Learning how to be a professional is a vital part of residency training. While hospital- or institution-based lecture style educational programs exist, they are often ineffective because the curriculum is not applicable to all specialties, although the basic concepts are the same. In this paper, the author suggests ways for institutions to develop professional attitude assessments and to survey residents’ responses to various unprofessional situations using case scenarios.

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Artificial Intelligence in Pathology: Hye Yoon Chang, Chan Kwon Jung, Junwoo Isaac Woo, Sanghun Lee, Joonyoung Cho, Sun Woo Kim, Tae-Yeong Kwak; J Pathol Transl Med. 2019;53(1):1-12. Published online December 28, 2018; DOI: https://doi.org/10.4132/jptm.2018.12.16

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Abstract PDF

As in other domains, artificial intelligence is becoming increasingly important in medicine. In particular,deep learning-based pattern recognition methods can advance the field of pathology byincorporating clinical, radiologic, and genomic data to accurately diagnose diseases and predictpatient prognoses. In this review, we present an overview of artificial intelligence, the brief historyof artificial intelligence in the medical domain, recent advances in artificial intelligence applied topathology, and future prospects of pathology driven by artificial intelligence.

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Case Study

Squamous Metaplasia in Pleomorphic Adenoma: A Diagnostic and Prognostic Enigma: Swati Sharma, Monica Mehendiratta, Nivedita Chaudhary, Vineet Gupta, Maulshree Kohli, Anjana Arora; J Pathol Transl Med. 2018;52(6):411-415. Published online October 1, 2018; DOI: https://doi.org/10.4132/jptm.2018.07.15

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144 Download
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Abstract PDF

Pleomorphic adenoma (PA) is the most common benign salivary gland tumor. Histologically, squamous metaplasia has been reported in PA, but has rarely been documented as being extensive enough to cause significant misdiagnosis. Here, we present an unusual case of PA in a 50-year-old female patient presenting with swelling on the postero-lateral aspect of the palate for a week. Histopathologically, the tumor exhibited the features of conventional PA with extensive squamous metaplasia and giant keratotic lamellae in cyst-like areas. Such exuberant squamous metaplasia and keratin can be a diagnostic and prognostic pitfall and lead to overtreatment of the patient.

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Jie‐Qiong Wang, Ge Li, Shao‐Hua Wang, Bo Yang, Yun Liu, Yu Wan, Cong‐Gai Huang, Fan Li
Cytopathology.2025; 36(5): 484. CrossRef
Keratocystoma: Molecular insights and diagnostic challenges in a rare salivary gland tumor
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Bronchial pleomorphic adenoma successfully diagnosed and resected with left lower sleeve lobectomy; a case report and literature review
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Salivary Gland Pleomorphic Adenomas Presenting With Extremely Varied Clinical Courses. A Single Institution Case-Control Study†
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Reviews

Let Archived Paraffin Blocks Be Utilized for Research with Waiver of Informed Consent: Yong-Jin Kim, Jeong Sik Park, Karam Ko, Chang Rok Jeong; J Pathol Transl Med. 2018;52(3):141-147. Published online April 5, 2018; DOI: https://doi.org/10.4132/jptm.2018.02.07

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Abstract PDF

Advances in biomedical and genetic research have contributed to more effective public health improvement via bench-to-bed research and the emergence of personalized medicine. This has certainly showcased the importance of archived human tissues, especially paraffin-embedded blocks in pathology. Currently in Korea, undue legislative regulations of the Bioethics and Safety Act suspend and at times discourage studies from taking place. In this paper, the authors underline the value of paraffin blocks in the era of personalized and translational medicine. We discuss detailed clauses regarding the applicability of paraffin blocks from a legal perspective and compare Korea’s regulations with those of other countries. The necessity for allowing waived consent and Institutional Review Board (IRB) approval will be argued throughout. The authors suggest that researchers declare the following to obtain IRB approval and waiver of informed consents: research could not be practically carried out without a waiver of consent; the proposed research presents no more than minimal risk of harm to subjects, and the waiver of consent will not adversely affect the rights and welfare of subjects; and research will not utilize a tissue block if only 1 is available for each subject, to allow future clinical use such as re-evaluation or further studies.

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Current Status of Thyroid Fine-Needle Aspiration Practice in Thailand: Somboon Keelawat, Samreung Rangdaeng, Supinda Koonmee, Tikamporn Jitpasutham, Andrey Bychkov; J Pathol Transl Med. 2017;51(6):565-570. Published online November 15, 2017; DOI: https://doi.org/10.4132/jptm.2017.08.12

9,957 View
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Abstract PDF

Thyroid carcinoma is one of the leading malignancies in Thailand increasingly prevalent in the female population. Fine-needle aspiration (FNA) cytology is a widely used diagnostic tool for evaluation of thyroid nodules and thyroid cancer. Thyroid FNA is a routine procedure universally performed in Thai hospitals by a variety of clinical specialists. Manual guidance is the first-line choice complemented by ultrasound assistance in selected cases. Despite national guidelines recommendations, the diagnostic criteria and terminology of the Bethesda System for Reporting Thyroid Cytopathology (TBSRTC) was slowly adopted in the local settings. Currently, the Bethesda system is actively promoted by the local professional societies as a uniform reporting system. Experience with thyroid FNA has been rarely reported to date—only a handful of publications are available in local journals. Our review, in addition to presenting various aspects of thyroid FNA in Thailand, established for the first time national references for a certain statistical outputs of TBSRTC based on the original multi-institutional cohort. The risk of malignancy in 2,017 operated thyroid nodules collected from three tertiary thyroid cancer centers was 21.7%, 14.7%, 35.9%, 44.4%, 76.7%, and 92.6% for categories I to VI, respectively. The malignancy risk in several diagnostic categories (II to IV) was higher than the risk estimated by TBSRTC and recent meta-analysis studies. We endorse the use of uniform terminology of the Bethesda system in Thailand, which will help facilitate communication among diverse medical professionals involved in the management of patients with thyroid nodules, to share local experience with the international audience.

Citations

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The Asian Thyroid Working Group, from 2017 to 2023
Kennichi Kakudo, Chan Kwon Jung, Zhiyan Liu, Mitsuyoshi Hirokawa, Andrey Bychkov, Huy Gia Vuong, Somboon Keelawat, Radhika Srinivasan, Jen-Fan Hang, Chiung-Ru Lai
Journal of Pathology and Translational Medicine.2023; 57(6): 289. CrossRef
Application of the Bethesda system for reporting thyroid cytopathology for classification of thyroid nodules: A clinical and cytopathological characteristics in Bhutanese population
Sonam Choden, Chimi Wangmo, Sushna Maharjan
Diagnostic Cytopathology.2021; 49(11): 1179. CrossRef
Patient Discomfort in Relation to Thyroid Nodule Fine-Needle Aspiration (FNA) Performed with or without Parenteral and/or Topical Anesthetic
Chenxiang Cao, Sina Jasim, Amrita Cherian, Aziza Nassar, Ana-Maria Chindris, Ana Marcella Rivas, Stephanie Bonnett, Melanie Caserta, Marius N. Stan, Victor J. Bernet
Endocrine Practice.2020; 26(12): 1497. CrossRef
Incidence and malignancy rates classified by The Bethesda System for Reporting Thyroid Cytopathology (TBSRTC) – An 8-year tertiary center experience in Thailand
Yotsapon Thewjitcharoen, Siriwan Butadej, Soontaree Nakasatien, Phawinpon Chotwanvirat, Sriurai Porramatikul, Sirinate Krittiyawong, Nampetch Lekpittaya, Thep Himathongkam
Journal of Clinical & Translational Endocrinology.2019; 16: 100175. CrossRef
The Use of Fine-Needle Aspiration (FNA) Cytology in Patients with Thyroid Nodules in Asia: A Brief Overview of Studies from the Working Group of Asian Thyroid FNA Cytology
Chan Kwon Jung, SoonWon Hong, Andrey Bychkov, Kennichi Kakudo
Journal of Pathology and Translational Medicine.2017; 51(6): 571. CrossRef
Thyroid FNA cytology in Asian practice—Active surveillance for indeterminate thyroid nodules reduces overtreatment of thyroid carcinomas
K. Kakudo, M. Higuchi, M. Hirokawa, S. Satoh, C. K. Jung, A. Bychkov
Cytopathology.2017; 28(6): 455. CrossRef

Thyroid Cytology: The Japanese System and Experience at Yamashita Thyroid Hospital: Shinya Satoh, Hiroyuki Yamashita, Kennichi Kakudo; J Pathol Transl Med. 2017;51(6):548-554. Published online October 11, 2017; DOI: https://doi.org/10.4132/jptm.2017.09.29

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Abstract PDF

In Japan, fine-needle aspiration (FNA) cytology is the most important diagnostic modality for triaging patients with thyroid nodules. A clinician (endocrinologist, endocrine surgeon, or head and neck surgeon) generally performs FNA cytology at the outpatient clinic, and ultrasound (US)-guided FNA is widespread because US is extremely common and most clinicians are familiar with it. Although almost all FNA thyroid samples are examined by certified cytopathologists and pathologists, some clinicians assess cytological specimens themselves. In Japan, there are two clinical guidelines regarding the management of thyroid nodules. One is the General Rules for the Description of Thyroid Cancer (GRDTC) published by the Japanese Society of Thyroid Surgery (JSTS) in 2005, and the other is the national reporting system for thyroid FNA cytology published by the Japan Thyroid Association in 2013 (Japanese system). Although the Bethesda System for Reporting Thyroid Cytopathology (Bethesda system) is rarely used in Japan, both the GRDTC and Japanese system tried to incorporate the Bethesda system so that the cytological diagnoses would be compatible with each other. The essential point of the Japanese system is stratification of follicular neoplasm (FN) into three subgroups based on cytological features in order to reduce unnecessary diagnostic thyroidectomy, and this system has been successful in stratifying the risk of malignancy in FN patients at several high-volume thyroid surgery centers. In Japan, the measurement of thyroglobulin and/or calcitonin in FNA needle washings is often used as an adjunct for diagnosis of possible cervical lymph node metastasis when FNA cytology is performed.

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Fine needle aspiration cytology diagnoses of follicular thyroid carcinoma: results from a multicenter study in Asia
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The Asian Thyroid Working Group, from 2017 to 2023
Kennichi Kakudo, Chan Kwon Jung, Zhiyan Liu, Mitsuyoshi Hirokawa, Andrey Bychkov, Huy Gia Vuong, Somboon Keelawat, Radhika Srinivasan, Jen-Fan Hang, Chiung-Ru Lai
Journal of Pathology and Translational Medicine.2023; 57(6): 289. CrossRef
Criteria for follow‐up of thyroid nodules diagnosed as follicular neoplasm without molecular testing – The experience of a high‐volume thyroid centre in Japan
Mitsuyoshi Hirokawa, Ayana Suzuki, Makoto Kawakami, Takumi Kudo, Akira Miyauchi
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The Significance of RAS-Like Mutations and MicroRNA Profiling in Predicting Malignancy in Thyroid Biopsy Specimens
Nicole A. Cipriani, Daniel N. Johnson, David H. Sarne, Peter Angelos, Ward Reeves, Tatjana Antic
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Mohannad Rajab, Richard J. Payne, Véronique-Isabelle Forest, Marc Pusztaszeri
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The Incidence of Noninvasive Follicular Thyroid Neoplasm with Papillary-Like Nuclear Features: A Meta-Analysis Assessing Worldwide Impact of the Reclassification
Chanchal Rana, Huy Gia Vuong, Thu Quynh Nguyen, Hoang Cong Nguyen, Chan Kwon Jung, Kennichi Kakudo, Andrey Bychkov
Thyroid.2021;[Epub] CrossRef
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Exploring the Inter-observer Agreement Among the Members of the Italian Consensus for the Classification and Reporting of Thyroid Cytology
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Sylvia L. Asa
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Clinical Impact of Non-Invasive Follicular Thyroid Neoplasm with Papillary-Like Nuclear Features on the Risk of Malignancy in the Bethesda System for Reporting Thyroid Cytopathology: A Meta-Analysis of 14,153 Resected Thyroid Nodules
Huy Gia Vuong, Thao T.K. Tran, Andre y. Bychkov, Chan Kwon Jung, Tadao Nakazawa, Kennichi Kakudo, R yohei Katoh, Tetsuo Kondo
Endocrine Practice.2019; 25(5): 491. CrossRef
A Multi-institutional Study of Prevalence and Clinicopathologic Features of Non-invasive Follicular Thyroid Neoplasm with Papillary-like Nuclear Features (NIFTP) in Korea
Ja Yeong Seo, Ji Hyun Park, Ju Yeon Pyo, Yoon Jin Cha, Chan Kwon Jung, Dong Eun Song, Jeong Ja Kwak, So Yeon Park, Hee Young Na, Jang-Hee Kim, Jae Yeon Seok, Hee Sung Kim, Soon Won Hong
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Noninvasive follicular thyroid neoplasm with papillary‐like nuclear features (NIFTP) in thyroid tumor classification
Kennichi Kakudo, Adel K. El‐Naggar, Steven P. Hodak, Elham Khanafshar, Yuri E Nikiforov, Vania Nosé, Lester D. R. Thompson
Pathology International.2018; 68(6): 327. CrossRef
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Haeyon Cho, Ji‐Ye Kim, Young Lyun Oh
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Hyunseo Cha, Ju Yeon Pyo, Soon Won Hong
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Impact of the modification of the diagnostic criteria in the 2017 Bethesda System for Reporting Thyroid Cytopathology: a report of a single institution in Japan
Miyoko Higuchi, Mitsuyoshi Hirokawa, Risa Kanematsu, Aki Tanaka, Ayana Suzuki, Naoki Yamao, Toshitetsu Hayashi, Seiji Kuma, Akira Miyauchi
Endocrine Journal.2018; 65(12): 1193. CrossRef
The Use of Fine-Needle Aspiration (FNA) Cytology in Patients with Thyroid Nodules in Asia: A Brief Overview of Studies from the Working Group of Asian Thyroid FNA Cytology
Chan Kwon Jung, SoonWon Hong, Andrey Bychkov, Kennichi Kakudo
Journal of Pathology and Translational Medicine.2017; 51(6): 571. CrossRef

Thyroid Cytology in India: Contemporary Review and Meta-analysis: Shipra Agarwal, Deepali Jain; J Pathol Transl Med. 2017;51(6):533-547. Published online October 5, 2017; DOI: https://doi.org/10.4132/jptm.2017.08.04

12,915 View
244 Download
17 Web of Science
20 Crossref

Abstract PDF

Fine-needle aspiration cytology (FNAC) is a screening test for triaging thyroid nodules, aiding in subsequent clinical management. However, the advantages have been overshadowed by the multiplicity of reporting systems and a wide range of nomenclature used. The Bethesda System for Reporting Thyroid Cytopathology (TBSRTC) was formulated in 2007, to give the world a uniform thyroid cytology reporting system, facilitating easy interpretation by the clinicians. Here, we review the status of thyroid FNAC in India in terms of various reporting systems used including a meta-analysis of the previously published data. An extensive literature search was performed using internet search engines. The reports with detailed classification system used in thyroid cytology were included. The meta-analysis of published data was compared with the implied risk of malignancy by TBSRTC. More than 50 studies were retrieved and evaluated. TBSRTC is currently the most widely used reporting system with different studies showing good efficacy and interobserver concordance. Ancillary techniques have, as of now, limited applicability and acceptability in thyroid cytology in India. Twenty-eight published articles met the criteria for inclusion in the meta-analysis. When compared with TBSRTC recommendations, the meta-analysis showed a higher risk of malignancy for categories I and III. Thyroid FNAC is practiced all over India. TBSRTC has found widespread acceptance, with most institutions using this system for routine thyroid cytology reporting. However, reasons for a high malignancy risk for categories I and III need to be looked into. Various possible contributing factors are discussed in the review.

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Thyroid FNA cytology in Asian practice—Active surveillance for indeterminate thyroid nodules reduces overtreatment of thyroid carcinomas
K. Kakudo, M. Higuchi, M. Hirokawa, S. Satoh, C. K. Jung, A. Bychkov
Cytopathology.2017; 28(6): 455. CrossRef
The Use of Fine-Needle Aspiration (FNA) Cytology in Patients with Thyroid Nodules in Asia: A Brief Overview of Studies from the Working Group of Asian Thyroid FNA Cytology
Chan Kwon Jung, SoonWon Hong, Andrey Bychkov, Kennichi Kakudo
Journal of Pathology and Translational Medicine.2017; 51(6): 571. CrossRef

Thyroid Fine-Needle Aspiration Practice in the Philippines: Agustina D. Abelardo; J Pathol Transl Med. 2017;51(6):555-559. Published online October 5, 2017; DOI: https://doi.org/10.4132/jptm.2017.07.14

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Fine-needle aspiration (FNA) is a well accepted initial approach in the management of thyroid lesions. It has come a long way since its introduction for nearly a century ago. In the Philippines, FNA of the thyroid was first introduced 30 years ago and has been utilized until now as a mainstay in the diagnosis of thyroid malignancy. The procedure is performed by pathologists, endocrinologists, surgeons, and radiologists. Most pathologists report the cytodiagnosis using a combination of the aspiration biopsy cytology method that closely resembles the histopathologic diagnosis of thyroid disorders and the six-tier nomenclature of The Bethesda System for Reporting Thyroid Cytopathology. Local endocrinologists and surgeons follow the guidelines of the 2015 American Thyroid Association in the management of thyroid disorders. There is still a paucity of local research studies but available data deal with cytohistologic correlations, sensitivity, specificity, and accuracy rates as well as usefulness of ultrasound-guided FNA. Cytohistologic correlations have a wide range of sensitivity from 30.7% to 73% and specificity from 83% to 100%. The low sensitivity can be attributed to poor tissue sampling since a majority of the thyroid FNA is done by palpation only. The reliability can be improved if FNA is guided by ultrasound as attested in both international and local studies. Overall, FNA of the thyroid has enabled the diagnosis of thyroid disorders with an accuracy of 72.8% to 87.2% and it correlates well with histopathology.

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Journal of Pathology and Translational Medicine.2023; 57(6): 289. CrossRef
Application of the Bethesda System for Reporting Thyroid Cytopathology in the Pediatric Population
Huy Gia Vuong, Ayana Suzuki, Hee Young Na, Pham Van Tuyen, Doan Minh Khuy, Hiep Canh Nguyen, Tikamporn Jitpasutham, Agustina Abelardo, Takashi Amano, So Yeon Park, Chan Kwon Jung, Mitsuyoshi Hirokawa, Ryohei Katoh, Kennichi Kakudo, Andrey Bychkov
American Journal of Clinical Pathology.2021; 155(5): 680. CrossRef
Thyroid FNA cytology in Asian practice—Active surveillance for indeterminate thyroid nodules reduces overtreatment of thyroid carcinomas
K. Kakudo, M. Higuchi, M. Hirokawa, S. Satoh, C. K. Jung, A. Bychkov
Cytopathology.2017; 28(6): 455. CrossRef
The Use of Fine-Needle Aspiration (FNA) Cytology in Patients with Thyroid Nodules in Asia: A Brief Overview of Studies from the Working Group of Asian Thyroid FNA Cytology
Chan Kwon Jung, SoonWon Hong, Andrey Bychkov, Kennichi Kakudo
Journal of Pathology and Translational Medicine.2017; 51(6): 571. CrossRef

Original Articles

Intraosseous Hibernoma: A Rare and Unique Intraosseous Lesion: Boram Song, Hye Jin Ryu, Cheol Lee, Kyung Chul Moon; J Pathol Transl Med. 2017;51(5):499-504. Published online August 22, 2017; DOI: https://doi.org/10.4132/jptm.2017.07.28

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Background
Hibernoma is a rare benign tumor of adults that is composed of multivacuolated adipocytes resembling brown fat cells. Hibernoma typically occurs in soft tissue, and intraosseous examples are very rare. Intraosseous hibernomas can radiologically mimic metastatic carcinoma and other tumorous conditions. Methods: To collect the intraosseous hibernomas, we searched the pathologic database and reviewed the hematoxylin and eosin (H&E)–stained slides of bone biopsy samples performed to differentiate radiologically abnormal bone lesions from 2006 to 2016. A total of six intraosseous hibernoma cases were collected, and clinical and radiological information was verified from electronic medical records. H&E slide review and immunohistochemical staining for CD68, pan-cytokeratin, and S-100 protein were performed. Results: Magnetic resonance imaging of intraosseous hibernomas showed low signal intensity with slightly hyperintense foci on T1 and intermediate to high signal intensity on T2 weighted images. Intraosseous hibernomas appeared as heterogeneous sclerotic lesions with trabecular thickening on computed tomography scans and revealed mild hypermetabolism on positron emission tomography scans. Histopathologically, the bone marrow space was replaced by sheets of multivacuolated, foamy adipocytes resembling brown fat cells, without destruction of bone trabeculae. In immunohistochemical analysis, the tumor cells were negative for CD68 and pan-cytokeratin and positive for S-100 protein. Conclusions: Intraosseous hibernoma is very rare. This tumor can be overlooked due to its rarity and resemblance to bone marrow fat. Pathologists need to be aware of this entity to avoid misdiagnosis of this rare lesion.

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Clinical, Radiological, and Pathological Features of Intraosseous Hibernoma: A Systematic Review of Case Reports and Case Series
Jawad Albashri, Ahmed Albashri, Muhannad Alhamrani, Abdulrahman Hassan, Hisham Shamah, Rayan Alhefzi, Najim Z. Alshahrani, Mohammed R. Algethami, Louis-Romée Le Nail, Ramy Samargandi
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The Use of the Bethesda System for Reporting Thyroid Cytopathology in Korea: A Nationwide Multicenter Survey by the Korean Society of Endocrine Pathologists: Mimi Kim, Hyo Jin Park, Hye Sook Min, Hyeong Ju Kwon, Chan Kwon Jung, Seoung Wan Chae, Hyun Ju Yoo, Yoo Duk Choi, Mi Ja Lee, Jeong Ja Kwak, Dong Eun Song, Dong Hoon Kim, Hye Kyung Lee, Ji Yeon Kim, Sook Hee Hong, Jang Sihn Sohn, Hyun Seung Lee, So Yeon Park, Soon Won Hong, Mi Kyung Shin; J Pathol Transl Med. 2017;51(4):410-417. Published online June 14, 2017; DOI: https://doi.org/10.4132/jptm.2017.04.05

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Abstract PDF

Background
The Bethesda System for Reporting Thyroid Cytopathology (TBSRTC) has standardized the reporting of thyroid cytology specimens. The objective of the current study was to evaluate the nationwide usage of TBSRTC and assess the malignancy rates in each category of TBSRTC in Korea.
Methods
Questionnaire surveys were used for data collection on the fine needle aspiration (FNA) of thyroid nodules at 74 institutes in 2012. The incidences and follow-up malignancy rates of each category diagnosed from January to December, 2011, in each institute were also collected and analyzed.
Results
Sixty out of 74 institutes answering the surveys reported the results of thyroid FNA in accordance with TBSRTC. The average malignancy rates for resected cases in 15 institutes were as follows: nondiagnostic, 45.6%; benign, 16.5%; atypical of undetermined significance, 68.8%; suspicious for follicular neoplasm (SFN), 30.2%; suspicious for malignancy, 97.5%; malignancy, 99.7%.
Conclusions
More than 80% of Korean institutes were using TBSRTC as of 2012. All malignancy rates other than the SFN and malignancy categories were higher than those reported by other countries. Therefore, the guidelines for treating patients with thyroid nodules in Korea should be revisited based on the malignancy rates reported in this study.

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Reviews

Molecular Testing of Lymphoproliferative Disorders: Current Status and Perspectives: Yoon Kyung Jeon, Sun Och Yoon, Jin Ho Paik, Young A Kim, Bong Kyung Shin, Hyun-Jung Kim, Hee Jeong Cha, Ji Eun Kim, Jooryung Huh, Young-Hyeh Ko; J Pathol Transl Med. 2017;51(3):224-241. Published online May 10, 2017; DOI: https://doi.org/10.4132/jptm.2017.04.09

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Abstract PDF

Molecular pathologic testing plays an important role for the diagnosis, prognostication and decision of treatment strategy in lymphoproliferative disease. Here, we briefly review the molecular tests currently used for lymphoproliferative disease and those which will be implicated in clinical practice in the near future. Specifically, this guideline addresses the clonality test for B- and T-cell proliferative lesions, molecular cytogenetic tests for malignant lymphoma, determination of cell-of-origin in diffuse large B-cell lymphoma, and molecular genetic alterations incorporated in the 2016 revision of the World Health Organization classification of lymphoid neoplasms. Finally, a new perspective on the next-generation sequencing for diagnostic, prognostic, and therapeutic purpose in malignant lymphoma will be summarized.

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Abstract PDF

Next-generation sequencing (NGS) has recently emerged as an essential component of personalized cancer medicine due to its high throughput and low per-base cost. However, no sufficient guidelines for implementing NGS as a clinical molecular pathology test are established in Korea. To ensure clinical grade quality without inhibiting adoption of NGS, a taskforce team assembled by the Korean Society of Pathologists developed laboratory guidelines for NGS cancer panel testing procedures and requirements for clinical implementation of NGS. This consensus standard proposal consists of two parts: laboratory guidelines and requirements for clinical NGS laboratories. The laboratory guidelines part addressed several important issues across multistep NGS cancer panel tests including choice of gene panel and platform, sample handling, nucleic acid management, sample identity tracking, library preparation, sequencing, analysis and reporting. Requirements for clinical NGS tests were summarized in terms of documentation, validation, quality management, and other required written policies. Together with appropriate pathologist training and international laboratory standards, these laboratory standards would help molecular pathology laboratories to successfully implement NGS cancer panel tests in clinic. In this way, the oncology community would be able to help patients to benefit more from personalized cancer medicine.

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Original Articles

An Experimental Infarct Targeting the Internal Capsule: Histopathological and Ultrastructural Changes: Chang-Woo Han, Kyung-Hwa Lee, Myung Giun Noh, Jin-Myung Kim, Hyung-Seok Kim, Hyung-Sun Kim, Ra Gyung Kim, Jongwook Cho, Hyoung-Ihl Kim, Min-Cheol Lee; J Pathol Transl Med. 2017;51(3):292-305. Published online May 10, 2017; DOI: https://doi.org/10.4132/jptm.2017.02.17

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Abstract PDF

Background
Stroke involving the cerebral white matter (WM) has increased in prevalence, but most experimental studies have focused on ischemic injury of the gray matter. This study was performed to investigate the WM in a unique rat model of photothrombotic infarct targeting the posterior limb of internal capsule (PLIC), focusing on the identification of the most vulnerable structure in WM by ischemic injury, subsequent glial reaction to the injury, and the fundamental histopathologic feature causing different neurologic outcomes.
Methods
Light microscopy with immunohistochemical stains and electron microscopic examinations of the lesion were performed between 3 hours and 21 days post-ischemic injury.
Results
Initial pathological change develops in myelinated axon, concomitantly with reactive change of astrocytes. The first pathology to present is nodular loosening to separate the myelin sheath with axonal wrinkling. Subsequent pathologies include rupture of the myelin sheath with extrusion of axonal organelles, progressive necrosis, oligodendrocyte degeneration and death, and reactive gliosis. Increase of glial fibrillary acidic protein (GFAP) immunoreactivity is an early event in the ischemic lesion. WM pathologies result in motor dysfunction. Motor function recovery after the infarct was correlated to the extent of PLIC injury proper rather than the infarct volume.
Conclusions
Pathologic changes indicate that the cerebral WM, independent of cortical neurons, is highly vulnerable to the effects of focal ischemia, among which myelin sheath is first damaged. Early increase of GFAP immunoreactivity indicates that astrocyte response initially begins with myelinated axonal injury, and supports the biologic role related to WM injury or plasticity. The reaction of astrocytes in the experimental model might be important for the study of pathogenesis and treatment of the WM stroke.

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Neuroglia and immune cells play different roles in neuroinflammation and neuroimmune response in post-stroke neural injury and repair
Hui Guo, Wen-cao Liu, Yan-yun Sun, Xin-chun Jin, Pan-pan Geng
Acta Pharmacologica Sinica.2025;[Epub] CrossRef
Animal models of focal ischemic stroke: brain size matters
Blazej Nowak, Piotr Rogujski, Raphael Guzman, Piotr Walczak, Anna Andrzejewska, Miroslaw Janowski
Frontiers in Stroke.2023;[Epub] CrossRef
Motor Cortex Plasticity During Functional Recovery Following Brain Damage
Noriyuki Higo
Journal of Robotics and Mechatronics.2022; 34(4): 700. CrossRef
Neurodegeneration, Myelin Loss and Glial Response in the Three-Vessel Global Ischemia Model in Rat
Tatiana Anan’ina, Alena Kisel, Marina Kudabaeva, Galina Chernysheva, Vera Smolyakova, Konstantin Usov, Elena Krutenkova, Mark Plotnikov, Marina Khodanovich
International Journal of Molecular Sciences.2020; 21(17): 6246. CrossRef
Quantitative assessment of demyelination in ischemic stroke in vivo using macromolecular proton fraction mapping
Marina Y Khodanovich, Alena A Kisel, Andrey E Akulov, Dmitriy N Atochin, Marina S Kudabaeva, Valentina Y Glazacheva, Michael V Svetlik, Yana A Medvednikova, Lilia R Mustafina, Vasily L Yarnykh
Journal of Cerebral Blood Flow & Metabolism.2018; 38(5): 919. CrossRef
Immunosignals of Oligodendrocyte Markers and Myelin-Associated Proteins Are Critically Affected after Experimental Stroke in Wild-Type and Alzheimer Modeling Mice of Different Ages
Dominik Michalski, Anna L. Keck, Jens Grosche, Henrik Martens, Wolfgang Härtig
Frontiers in Cellular Neuroscience.2018;[Epub] CrossRef
Administration of Downstream ApoE Attenuates the Adverse Effect of Brain ABCA1 Deficiency on Stroke
Xiaohui Wang, Rongwen Li, Alex Zacharek, Julie Landschoot-Ward, Fengjie Wang, Kuan-Han Hank Wu, Michael Chopp, Jieli Chen, Xu Cui
International Journal of Molecular Sciences.2018; 19(11): 3368. CrossRef

Current Status of Pathologic Examinations in Korea, 2011–2015, Based on the Health Insurance Review and Assessment Service Dataset: Sun-ju Byeon; J Pathol Transl Med. 2017;51(2):137-147. Published online February 22, 2017; DOI: https://doi.org/10.4132/jptm.2016.12.30

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Abstract PDF Supplementary Material

Background
Pathologic examinations play an important role in medical services. Until recently, the overall status of pathologic examinations in Korea has not been identified. I conducted a nationwide survey of pathologic examination status using the insurance reimbursements (IRs) dataset from the Health Insurance Review and Assessment Service (HIRA). The aims of this study were to estimate current pathologic examination status in Korea and to provide information for future resource arrangement in the pathology area. Methods: I asked HIRA to provide data on IR requests, including pathologic examinations from 2011 to 2015. Pathologic examination status was investigated according to the following categories: annual statistics, requesting department, type of medical institution, administrative district, and location at which pathologic examinations were performed. Results: Histologic mapping, immunohistochemistry, and cervicovaginal examinations have increased in the last 5 years. Internal medicine, general surgery, obstetrics/gynecology, and urology were the most common medical departments requesting pathologic examinations. The majority of pathologic examinations were frequently performed in tertiary hospitals. About 60.3% of pathologic examinations were requested in medical institutions located in Seoul, Gyeonggi-do, and Busan. More than half of the biopsies and aspiration cytologic examinations were performed using outside services. The mean period between IR requests and 99 percentile IR request completion inspections was 6.2 months. Conclusions: This survey was based on the HIRA dataset, which is one of the largest medical datasets in Korea. The trends of some pathologic examinations were reflected in the policies and needs for detailed diagnosis. The numbers and proportions of pathologic examinations were correlated with the population and medical institutions of the area, as well as patient preference. These data will be helpful for future resource arrangement in the pathology area.

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Validation of the pathological prognostic staging system proposed in the revised eighth edition of the AJCC staging manual in different molecular subtypes of breast cancer
Nuri Jang, Jung Eun Choi, Su Hwan Kang, Young Kyung Bae
Virchows Archiv.2019; 474(2): 193. CrossRef

Analysis of Surgical Pathology Data in the HIRA Database: Emphasis on Current Status and Endoscopic Submucosal Dissection Specimens: Sun-ju Byeon, Woo Ho Kim; J Pathol Transl Med. 2016;50(3):204-210. Published online April 4, 2016; DOI: https://doi.org/10.4132/jptm.2016.03.04

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Abstract PDF

Background
In Korea, medical institutions make claims for insurance reimbursement to the Health Insurance Review and Assessment Service (HIRA). Thus, HIRA databases reflect the general medical services that are provided in Korea. We conducted two pathology-related studies using a HIRA national patient sample (NPS) data (selection probability, 0.03). First, we evaluated the current status of general pathologic examination in Korea. Second, we evaluated pathologic issues associated with endoscopic submucosal dissection (ESD).
Methods
The sample data used in this study was HIRA-NPS-2013-0094.
Results
In the NPS dataset, 163,372 pathologic examinations were performed in 103,528 patients during the year 2013. Considering sampling weight (33.3), it is estimated that 5,440,288 (163,372 × 33.3) pathologic examinations were performed. Internal medicine and general surgery were the most common departments requesting pathologic examinations. The region performing pathologic examinations were different according to type of medical institution. In total, 490 patients underwent ESD, and 43.4% (213/490) underwent ESD due to gastric carcinoma. The results of the ESD led to a change in disease code for 10.5% (29/277) of non-gastric carcinoma patients. In addition, 21 patients (4.3%) underwent surgery following the ESD. The average period between ESD and surgery was 44 days.
Conclusions
HIRA sample data provide the nation-wide landscape of specific procedure. However, in order to reduce the statistical error, further studies using entire HIRA data are needed.

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Min Ah Suh, Su Bee Park, Min Seob Kwak, Jin Young Yoon, Jae Myung Cha
Yonsei Medical Journal.2023; 64(9): 549. CrossRef
Using big data to see the forest and the trees: endoscopic submucosal dissection of early gastric cancer in Korea
Chang Seok Bang, Gwang Ho Baik
The Korean Journal of Internal Medicine.2019; 34(4): 772. CrossRef
Current Status of Pathologic Examinations in Korea, 2011–2015, Based on the Health Insurance Review and Assessment Service Dataset
Sun-ju Byeon
Journal of Pathology and Translational Medicine.2017; 51(2): 137. CrossRef

Reviews

Idiopathic Noncirrhotic Portal Hypertension: An Appraisal: Hwajeong Lee, Aseeb Ur Rehman, M. Isabel Fiel; J Pathol Transl Med. 2016;50(1):17-25. Published online November 11, 2015; DOI: https://doi.org/10.4132/jptm.2015.09.23

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Abstract PDF

Idiopathic noncirrhotic portal hypertension is a poorly defined clinical condition of unknown etiology. Patients present with signs and symptoms of portal hypertension without evidence of cirrhosis. The disease course appears to be indolent and benign with an overall better outcome than cirrhosis, as long as the complications of portal hypertension are properly managed. This condition has been recognized in different parts of the world in diverse ethnic groups with variable risk factors, resulting in numerous terminologies and lack of standardized diagnostic criteria. Therefore, although the diagnosis of idiopathic noncirrhotic portal hypertension requires clinical exclusion of other conditions that can cause portal hypertension and histopathologic confirmation, this entity is under-recognized clinically as well as pathologically. Recent studies have demonstrated that variable histopathologic entities with different terms likely represent a histologic spectrum of a single entity of which obliterative portal venopathy might be an underlying pathogenesis. This perception calls for standardization of the nomenclature and formulation of widely accepted diagnostic criteria, which will facilitate easier recognition of this disorder and will highlight awareness of this entity.

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Pathology-MRI Correlation of Hepatocarcinogenesis: Recent Update: Jimi Huh, Kyung Won Kim, Jihun Kim, Eunsil Yu; J Pathol Transl Med. 2015;49(3):218-229. Published online May 15, 2015; DOI: https://doi.org/10.4132/jptm.2015.04.15

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Abstract PDF

Understanding the important alterations during hepatocarcinogenesis as well as the characteristic magnetic resonance imaging (MRI) and histopathological features will be helpful for managing patients with chronic liver disease and hepatocellular carcinoma. Recent advances in MRI techniques, such as fat/iron quantification, diffusion-weighted images, and gadoxetic acid-enhanced MRI, have greatly enhanced our understanding of hepatocarcinogenesis.

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Original Article

Pathologic Factors Associated with Prognosis after Adjuvant Chemotherapy in Stage II/III Microsatellite-Unstable Colorectal Cancers: Jung Ho Kim, Jeong Mo Bae, Hyeon Jeong Oh, Hye Seung Lee, Gyeong Hoon Kang; J Pathol Transl Med. 2015;49(2):118-128. Published online March 12, 2015; DOI: https://doi.org/10.4132/jptm.2015.02.05

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Background
Although there are controversies regarding the benefit of fluoropyrimidine-based adjuvant chemotherapy in patients with microsatellite instability–high (MSI-H) colorectal cancer (CRC), the pathologic features affecting postchemotherapeutic prognosis in these patients have not been fully identified yet. Methods: A total of 26 histopathologic and immunohistochemical factors were comprehensively evaluated in 125 stage II or III MSI-H CRC patients who underwent curative resection followed by fluoropyrimidine-based adjuvant chemotherapy. We statistically analyzed the associations of these factors with disease-free survival (DFS). Results: Using a Kaplan- Meier analysis with log-rank test, we determined that ulceroinfiltrative gross type (p=.003), pT4 (p<.001), pN2 (p=.002), perineural invasion (p=.001), absence of peritumoral lymphoid reaction (p=.041), signet ring cell component (p=.006), and cribriform comedo component (p=.004) were significantly associated with worse DFS in patients receiving oxaliplatin-based adjuvant chemotherapy (n=45). By contrast, pT4 (p<.001) and tumor budding-positivity (p=.032) were significant predictors of poor survival in patients receiving non-oxaliplatin–based adjuvant chemotherapy (n=80). In Cox proportional hazards regression model-based univariate and multivariate analyses, pT category (pT1-3 vs pT4) was the only significant prognostic factor in patients receiving non-oxaliplatin–based adjuvant chemotherapy, whereas pT category, signet ring cell histology and cribriform comedo histology remained independent prognostic factors in patients receiving oxaliplatin-based adjuvant chemotherapy. Conclusions: pT4 status is the most significant pathologic determinant of poor outcome after fluoropyrimidine-based adjuvant chemotherapy in patients with stage II/III MSI-H CRC.

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Review

Utility of Transmission Electron Microscopy in Small Round Cell Tumors: Na Rae Kim, Seung Yeon Ha, Hyun Yee Cho; J Pathol Transl Med. 2015;49(2):93-101. Published online March 12, 2015; DOI: https://doi.org/10.4132/jptm.2015.01.30

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Abstract PDF

Small round cell tumors (SRCTs) are a heterogeneous group of neoplasms composed of small, primitive, and undifferentiated cells sharing similar histology under light microscopy. SRCTs include Ewing sarcoma/peripheral neuroectodermal tumor family tumors, neuroblastoma, desmoplastic SRCT, rhabdomyosarcoma, poorly differentiated round cell synovial sarcoma, mesenchymal chondrosarcoma, small cell osteosarcoma, small cell malignant peripheral nerve sheath tumor, and small cell schwannoma. Non-Hodgkin’s malignant lymphoma, myeloid sarcoma, malignant melanoma, and gastrointestinal stromal tumor may also present as SRCT. The current shift towards immunohistochemistry and cytogenetic molecular techniques for SRCT may be inappropriate because of antigenic overlapping or inconclusive molecular results due to the lack of differentiation of primitive cells and unavailable genetic service or limited moleculocytogenetic experience. Although usage has declined, electron microscopy (EM) remains very useful and shows salient features for the diagnosis of SRCTs. Although EM is not always required, it provides reliability and validity in the diagnosis of SRCT. Here, the ultrastructural characteristics of SRCTs are reviewed and we suggest that EM would be utilized as one of the reliable modalities for the diagnosis of undifferentiated and poorly differentiated SRCTs.

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Original Article

Incidence and Malignancy Rates of Diagnoses in the Bethesda System for Reporting Thyroid Aspiration Cytology: An Institutional Experience: Ji Hye Park, Sun Och Yoon, Eun Ju Son, Hye Min Kim, Ji Hae Nahm, SoonWon Hong; Korean J Pathol. 2014;48(2):133-139. Published online April 28, 2014; DOI: https://doi.org/10.4132/KoreanJPathol.2014.48.2.133

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Abstract PDF

Background

The Bethesda System for Reporting Thyroid Cytopathology (BSRTC) uses six diagnostic categories to standardize communication of thyroid fine-needle aspiration (FNA) interpretations between clinicians and cytopathologists. Since several studies have questioned the diagnostic accuracy of this system, we examined its accuracy in our hospital.

Methods

We calculated the incidences and malignancy rates of each diagnostic category in the BSRTC for 1,730 FNAs that were interpreted by four cytopathologists in Gangnam Severance Hospital between October 1, 2011, and December 31, 2011.

Results

The diagnostic incidences of categories I-VI were as follows: 13.3%, 40.6%, 9.1%, 0.4%, 19.3%, and 17.3%, respectively. Similarly, the malignancy rates of these categories were as follows: 35.3%, 5.6%, 69.0%, 50.0%, 98.7%, and 98.9%, respectively. In categories II, V, and VI, there were no statistically significant differences in the ranges of the malignancy rates among the four cytopathologists. However, there were significant differences in the ranges for categories I and III.

Conclusions

Our findings suggest that institutions that use the BSRTC should regularly update their diagnostic criteria. We also propose that institutions issue an annual report of incidences and malignancy rates to help other clinicians improve the case management of patients with thyroid nodules.

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