Journal of Pathology and Translational Medicine

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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Abstract PDF Supplementary Material: 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.

Reviews

Molecular biomarker testing for non–small cell lung cancer: consensus statement of the Korean Cardiopulmonary Pathology Study Group: Sunhee Chang, Hyo Sup Shim, Tae Jung Kim, Yoon-La Choi, Wan Seop Kim, Dong Hoon Shin, Lucia Kim, Heae Surng Park, Geon Kook Lee, Chang Hun Lee; J Pathol Transl Med. 2021;55(3):181-191. Published online May 11, 2021; DOI: https://doi.org/10.4132/jptm.2021.03.23

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Molecular biomarker testing is the standard of care for non–small cell lung cancer (NSCLC) patients. In 2017, the Korean Cardiopulmonary Pathology Study Group and the Korean Molecular Pathology Study Group co-published a molecular testing guideline which contained almost all known genetic changes that aid in treatment decisions or predict prognosis in patients with NSCLC. Since then there have been significant changes in targeted therapies as well as molecular testing including newly approved targeted drugs and liquid biopsy. In order to reflect these changes, the Korean Cardiopulmonary Pathology Study Group developed a consensus statement on molecular biomarker testing. This consensus statement was crafted to provide guidance on what genes should be tested, as well as methodology, samples, patient selection, reporting and quality control.

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Liquid biopsy using extracellular vesicle–derived DNA in lung adenocarcinoma: In Ae Kim, Jae Young Hur, Hee Joung Kim, Seung Eun Lee, Wan Seop Kim, Kye Young Lee; J Pathol Transl Med. 2020;54(6):453-461. Published online October 8, 2020; DOI: https://doi.org/10.4132/jptm.2020.08.13

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Abstract PDF

Blood liquid biopsy has emerged as a way of overcoming the clinical limitations of repeat biopsy by testing for the presence of acquired resistance mutations to therapeutic agents. Despite its merits of repeatability and non-invasiveness, this method is currently only used as a supplemental test due to a relatively low sensitivity rate of 50%–60%, and cannot replace tissue biopsy. The circulating tumor DNAs used in blood liquid biopsies are passive products of fragmented DNA with a short half-life released following tumor cell death; the low sensitivity seen with liquid blood biopsy results from this instability, which makes increasing the sensitivity of this test fundamentally difficult. Extracellular vesicles (EVs) are ideal carriers of cancer biomarkers, as cancer cells secret an abundance of EVs, and the contents of tumor cell-originated EVs reflect the molecular and genetic composition of parental cells. In addition, EV-derived DNAs (EV DNAs) consist of large-sized genomic DNAs and tumor-specific oncogenic mutant DNAs. For these reasons, liquid biopsy using EV DNA has the potential to overcome issues arising from tissue shortages associated with small biopsies, which are often seen in lung cancer patients, and the biopsy product can be used in other diagnostic methods, such as epidermal growth factor receptor (EGFR) mutation testing and next-generation sequencing (NGS). A higher sensitivity can be achieved when EV DNAs obtained from bronchoalveolar lavage fluid (BALF) are used rather than those from blood. BALF, when obtained close to the tumor site, is a promising liquid biopsy tool, as it enables the gathering of both cellular and non-cellular fractions of the tumor microenvironment, and provides increased diagnostic sensitivity when compared to blood.

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Current status and future perspectives of liquid biopsy in non-small cell lung cancer: Sunhee Chang, Jae Young Hur, Yoon-La Choi, Chang Hun Lee, Wan Seop Kim; J Pathol Transl Med. 2020;54(3):204-212. Published online April 15, 2020; DOI: https://doi.org/10.4132/jptm.2020.02.27

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Abstract PDF

With advances in target therapy, molecular analysis of tumors is routinely required for treatment decisions in patients with advanced non-small cell lung cancer (NSCLC). Liquid biopsy refers to the sampling and analysis of circulating cell-free tumor DNA (ctDNA) in various body fluids, primarily blood. Because the technique is minimally invasive, liquid biopsies are the future in cancer management. Epidermal growth factor receptor (EGFR) ctDNA tests have been performed in routine clinical practice in advanced NSCLC patients to guide tyrosine kinase inhibitor treatment. In the near future, liquid biopsy will be a crucial prognostic, predictive, and diagnostic method in NSCLC. Here we present the current status and future perspectives of liquid biopsy in NSCLC.

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Provisional Guideline Recommendation for EGFR Gene Mutation Testing in Liquid Samples of Lung Cancer Patients: A Proposal by the Korean Cardiopulmonary Pathology Study Group: Dong Hoon Shin, Hyo Sup Shim, Tae Jung Kim, Heae Surng Park, Yun La Choi, Wan Seop Kim, Lucia Kim, Sun Hee Chang, Joon Seon Song, Hyo jin Kim, Jung Ho Han, Chang Hun Lee, Geon Kook Lee, Se Jin Jang; J Pathol Transl Med. 2019;53(3):153-158. Published online February 28, 2019; DOI: https://doi.org/10.4132/jptm.2019.02.22

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Abstract PDF

Liquid biopsy for detection of mutation from circulating tumor DNA is a new technology which is attractive in that it is non-invasive. Epidermal growth factor receptor (EGFR) tyrosine kinase inhibitors (TKI) is an effective first line drug for advanced non-small cell lung cancer patients who harbor activating EGFR mutation. During the course of treatment, resistance against TKI arises which can be contributed to EGFR T790M mutation in about 50–60% of patients. Third generation TKI may overcome the resistance. In patients who cannot undergo tissue biopsy due to variable reasons, liquid biopsy is an excellent alternative for the detection of EGFR T790M mutation. However, this relatively novel method requires standardization and vigorous quality insurance. Thus, a standard set of guideline recommendations for liquid biopsy for EGFR mutation testing suitable for the Korean medical community is necessary. In this article, we propose a set of provisional guideline recommendations that was discussed and approved by the Cardiopulmonary Pathology Study Group of the Korean Society of Pathologists.

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Molecular biomarker testing for non–small cell lung cancer: consensus statement of the Korean Cardiopulmonary Pathology Study Group
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Current status and future perspectives of liquid biopsy in non-small cell lung cancer
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Original Articles

Current Cytology Practices in Korea: A Nationwide Survey by the Korean Society for Cytopathology: Eun Ji Oh, Chan Kwon Jung, Dong-Hoon Kim, Han Kyeom Kim, Wan Seop Kim, So-Young Jin, Hye Kyoung Yoon; J Pathol Transl Med. 2017;51(6):579-587. Published online September 27, 2017; DOI: https://doi.org/10.4132/jptm.2017.08.11

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Abstract PDF

Background
Limited data are available on the current status of cytology practices in Korea. This nationwide study presents Korean cytology statistics from 2015.
Methods
A nationwide survey was conducted in 2016 as a part of the mandatory quality-control program by the Korean Society for Cytopathology. The questionnaire was sent to 208 medical institutions performing cytopathologic examinations in Korea. Individual institutions were asked to submit their annual cytology statistical reports and gynecologic cytology-histology correlation data for 2015.
Results
Responses were obtained from 206 medical institutions including 83 university hospitals, 87 general hospitals, and 36 commercial laboratories. A total of 8,284,952 cytologic examinations were performed in 2015, primarily in commercial laboratories (74.9%). The most common cytology specimens were gynecologic samples (81.3%). Conventional smears and liquid-based cytology were performed in 6,190,526 (74.7%) and 2,094,426 (25.3%) cases, respectively. The overall diagnostic concordance rate between cytologic and histologic diagnoses of uterine cervical samples was 70.5%. Discordant cases were classified into three categories: category A (minimal clinical impact, 17.4%), category B (moderate clinical impact, 10.2%), and category C (major clinical impact, 1.9%). The ratio of atypical squamous cells of undetermined significance to squamous intraepithelial lesion was 1.6 in university hospitals, 2.9 in general hospitals, and 4.9 in commercial laboratories.
Conclusions
This survey reveals the current status and trend of cytology practices in Korea. The results of this study can serve as basic data for the establishment of nationwide cytopathology policies and quality improvement guidelines in Korean medical institutions.

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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
Journal of Pathology and Translational Medicine.2023; 57(2): 95. 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
Journal of Pathology and Translational Medicine.2023; 57(5): 251. CrossRef
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Current status of cytopathology practice in Korea: impact of the coronavirus pandemic on cytopathology practice
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Dominique Diouf, Gora Diop, Cheikh Ahmadou Tidian Diarra, Aminata Issa Ngom, Khadija Niane, Moussa Ndiaye, Sidy Ka, Oumar Faye, Ahmadou Dem
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Current status of cytopathology practices in Korea: annual report on the Continuous Quality Improvement program of the Korean Society for Cytopathology for 2018
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Review of Medical Advisory Services by the Korean Society of Pathologists from 2003 to 2014: Min Hye Jang, Geon Kook Lee, Han Seong Kim, Wan Seop Kim; J Pathol Transl Med. 2016;50(1):37-44. Published online November 17, 2015; DOI: https://doi.org/10.4132/jptm.2015.09.18

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Abstract PDF Supplementary Material: Background
Since 2003, the Korean Society of Pathologists (KSP) has been officially providing medical advisory services (MAS). We reviewed the cases submitted to the KSP between 2003 and 2014. Methods: In total, 1,950 cases were submitted, most by private health insurance companies. The main purposes of the consultations were to clarify the initial diagnoses and to assign a proper disease classification code. We comprehensively reviewed 1,803 consultation cases with detailed information. Results: In spite of some fluctuations, the number of submitted cases has been significantly increasing over the 12 study years. The colon and rectum (40.3%), urinary bladder (14.2%), and stomach (6.9%) were the three most common tissues of origin. The most common diagnoses for each of the three tissues of origin were neuroendocrine tumor (50.7%), non-invasive papillary urothelial carcinoma (70.7%), and adenocarcinoma (36.2%). Regardless of the tissue of origin, neuroendocrine tumor of the digestive system was the most common diagnosis (419 of 1,803). Conclusions: In the current study, we found that pathologic consultations associated with private health insurance accounted for a large proportion of the MAS. Coding of the biologic behavior of diseases was the main issue of the consultations. In spite of the effort of the KSP to set proper guidelines for coding and classification of tumors, this review revealed that problems still exist and will continue to be an important issue.

Analysis of Mutations in Epidermal Growth Factor Receptor Gene in Korean Patients with Non-small Cell Lung Cancer: Summary of a Nationwide Survey: Sang Hwa Lee, Wan Seop Kim, Yoo Duk Choi, Jeong Wook Seo, Joung Ho Han, Mi Jin Kim, Lucia Kim, Geon Kook Lee, Chang Hun Lee, Mee Hye Oh, Gou Young Kim, Sun Hee Sung, Kyo Young Lee, Sun Hee Chang, Mee Sook Rho, Han Kyeom Kim, Soon Hee Jung, Se Jin Jang, The Cardiopulmonary Pathology Study Group of Korean Society of Pathologists; J Pathol Transl Med. 2015;49(6):481-488. Published online October 13, 2015; DOI: https://doi.org/10.4132/jptm.2015.09.14

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Abstract PDF

Background
Analysis of mutations in the epidermal growth factor receptor gene (EGFR) is important for predicting response to EGFR tyrosine kinase inhibitors. The overall rate of EGFR mutations in Korean patients is variable. To obtain comprehensive data on the status of EGFR mutations in Korean patients with lung cancer, the Cardiopulmonary Pathology Study Group of the Korean Society of Pathologists initiated a nationwide survey. Methods: We obtained 1,753 reports on EGFR mutations in patients with lung cancer from 15 hospitals between January and December 2009. We compared EGFR mutations with patient age, sex, history of smoking, histologic diagnosis, specimen type, procurement site, tumor cell dissection, and laboratory status. Results: The overall EGFR mutation rate was 34.3% in patients with non-small cell lung cancer (NSCLC) and 43.3% in patients with adenocarcinoma. EGFR mutation rate was significantly higher in women, never smokers, patients with adenocarcinoma, and patients who had undergone excisional biopsy. EGFR mutation rates did not differ with respect to patient age or procurement site among patients with NSCLC. Conclusions: EGFR mutation rates and statuses were similar to those in published data from other East Asian countries.

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Correspondence

Erratum: Correction of Acknowledgments. ERG Immunohistochemistry as an Endothelial Marker for Assessing Lymphovascular Invasion: Sehun Kim, Hyung Kyu Park, Ho Young Jung, So-Young Lee, Kyueng-Whan Min, Wook Youn Kim, Hye Seung Han, Wan Seop Kim, Tae Sook Hwang, So Dug Lim; Korean J Pathol. 2013;47(5):503-503. Published online October 25, 2013; DOI: https://doi.org/10.4132/KoreanJPathol.2013.47.5.503

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Case Study

Rhabdoid Colorectal Carcinomas: Reports of Two Cases: Sang Hwa Lee, Hyesil Seol, Wook Youn Kim, So Dug Lim, Wan Seop Kim, Tae Sook Hwang, Hye Seung Han; Korean J Pathol. 2013;47(4):372-377. Published online August 26, 2013; DOI: https://doi.org/10.4132/KoreanJPathol.2013.47.4.372

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Abstract PDF

Rhabdoid colorectal carcinomas are very rare and only 10 cases have been previously reported. We report two cases of rhabdoid colorectal carcinoma, one arising in the sigmoid colon of a 62-year-old man and another in the rectum of an 83-year-old woman. In both cases, the patients had advanced tumors with lymph node metastases. The tumors mostly showed a diffuse arrangement with rhabdoid features and small glandular regions were combined. Transitional areas from the adenocarcinomas to the rhabdoid tumors were also noted. Adenocarcinoma cells were positive for mixed cytokeratin (CK), CK20 and epithelial membranous antigen (EMA), but focal positive for vimentin. The rhabdoid tumor cells were positive for mixed CK, but focal positive or negative for CK20 and EMA. In addition, they were diffusely positive for vimentin, but negative for desmin. The histological and immunohistologial findings of these two cases suggest that the rhabodid tumor cells originated from dedifferentiated adenocarcinomas.

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Original Article

ERG Immunohistochemistry as an Endothelial Marker for Assessing Lymphovascular Invasion: Sehun Kim, Hyung Kyu Park, Ho Young Jung, So-Young Lee, Kyueng-Whan Min, Wook Youn Kim, Hye Seung Han, Wan Seop Kim, Tae Sook Hwang, So Dug Lim; Korean J Pathol. 2013;47(4):355-364. Published online August 26, 2013; DOI: https://doi.org/10.4132/KoreanJPathol.2013.47.4.355

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Abstract PDF

Background

ERG, a member of the ETS family of transcription factors, is a highly specific endothelial marker. We investigated whether the use of ERG immunostaining can help pathologists detect lymphovascular invasion (LVI) and decrease interobserver variability in LVI diagnosis.

Methods

Fifteen cases of surgically resected colorectal cancers with hepatic metastasis were selected and the most representative sections for LVI detection were immunostained with ERG, CD31, and D2-40. Eight pathologists independently evaluated LVI status on hematoxylin and eosin (H&E) and the corresponding immunostained sections and then convened for a consensus meeting. The results were analyzed by kappa (κ) statistics.

Results

The average rate of LVI positivity was observed in 43% with H&E only, 10% with CD31, 29% with D2-40, and 16% with ERG. Agreement among pathologists was fair for H&E only (κ=0.27), D2-40 (κ=0.21), ERG (κ=0.23), and was moderate for CD31 (κ=0.55). Consensus revealed that ERG nuclear immunoreactivity showed better visual contrast of LVI detection than the other staining, with improved agreement and LVI detection rate (κ=0.65, LVI positivity rate 80%).

Conclusions

The present study demonstrated a superiority with ERG immunostaining and indicated that ERG is a promising panendothelial marker that might help pathologists increase LVI detection and decrease interobserver variability in LVI diagnosis.

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Case Study

A Case of Multifocal Papillary Thyroid Carcinoma Consisting of One Encapsulated Follicular Variant with BRAF K601E Mutation and Three Conventional Types with BRAF V600E Mutation: Wook Youn Kim, Young Sin Ko, Tae Sook Hwang, Hye Seung Han, So Dug Lim, Wan Seop Kim, Seo Young Oh; Korean J Pathol. 2013;47(3):293-298. Published online June 25, 2013; DOI: https://doi.org/10.4132/KoreanJPathol.2013.47.3.293

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Abstract PDF

Multifocal papillary thyroid carcinoma (mPTC) comprises about 20-30% of PTC. In mPTC, individual tumor foci can be identical or frequently composed of different histological types including follicular, solid, tall-cell or conventional patterns. We report a case of mPTC consisting of one encapsulated follicular variant of papillary thyroid carcinoma (FVPTC) and three conventional PTCs in a 44-year-old woman. This case genetically demonstrates unique features including the simultaneous presence of the BRAF V600E (T1799A) mutation and the BRAF K601E (A1801G) mutation in conventional PTC and FVPTC, respectively.

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Original Articles

No Detection of Simian Virus 40 in Malignant Mesothelioma in Korea: Minseob Eom, Jamshid Abdul-Ghafar, Sun-Mi Park, Joung Ho Han, Soon Won Hong, Kun Young Kwon, Eun Suk Ko, Lucia Kim, Wan Seop Kim, Seung Yeon Ha, Kyo Young Lee, Chang Hun Lee, Hye Kyoung Yoon, Yoo Duk Choi, Myoung Ja Chung, Soon-Hee Jung; Korean J Pathol. 2013;47(2):124-129. Published online April 24, 2013; DOI: https://doi.org/10.4132/KoreanJPathol.2013.47.2.124

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Abstract PDF

Background

Simian virus 40 (SV40), a polyomavirus, was discovered as a contaminant of a human polio vaccine in the 1960s. It is known that malignant mesothelioma (MM) is associated with SV40, and that the virus works as a cofactor to the carcinogenetic effects of asbestos. However, the reports about the correlation between SV40 and MM have not been consistent. The purpose of this study is to identify SV40 in MM tissue in Korea through detection of SV40 protein and DNA.

Methods

We analyzed 62 cases of available paraffin-blocks enrolled through the Korean Malignant Mesothelioma Surveillance System and performed immunohistochemistry for SV40 protein and real-time polymerase chain reaction (PCR) for SV40 DNA.

Results

Of 62 total cases, 40 had disease involving the pleura (64.5%), and 29 (46.8%) were found to be of the epithelioid subtype. Immunostaining demonstrated that all examined tissues were negative for SV40 protein. Sufficient DNA was extracted for real-time PCR analysis from 36 cases. Quantitative PCR of these samples showed no increase in SV40 transcript compared to the negative controls.

Conclusions

SV40 is not associated with the development of MM in Korea.

Citations

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Binding of SV40’s Viral Capsid Protein VP1 to Its Glycosphingolipid Receptor GM1 Induces Negative Membrane Curvature: A Molecular Dynamics Study
Raisa Kociurzynski, Sophie D. Beck, Jean-Baptiste Bouhon, Winfried Römer, Volker Knecht
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CD44s and CD44v6 Are Predominantly Expressed in the Non-germinal Center B-Cell-like Type of Diffuse Large B-Cell Lymphomas.: Kyueng Whan Min, Young Ha Oh, Chan Kum Park, So Dug Lim, Wan Seop Kim; Korean J Pathol. 2011;45(6):589-595.; DOI: https://doi.org/10.4132/KoreanJPathol.2011.45.6.589

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Abstract PDF: BACKGROUND
CD44 protein is known as a homing cellular adhesion molecule that is linked to diverse cellular functions such as adhesion, migration and invasion, which are all important in cancer progression and metastasis. The expression of CD44 standard and variant isoforms (CD44 standard isoform [CD44s] and CD44 splice variants containing exon v6 [CD44v6], respectively) is associated with an unfavorable clinical outcome in various neoplasms.
METHODS
Forty patients who were diagnosed with diffuse large B-cell lymphoma (DLBCL) through biopsy at Hanyang University Hospital between 1996 and 2003 were included in this study. CD44 proteins expression was analyzed by immunohistochemical staining on a tissue microarray and the correlation of CD44 with the types of DLBCL and clinical parameters, including the factors defined by the International Prognostic Index, was evaluated.
RESULTS
A high CD44s and intermediate to strong CD44v6 expression, including cytoplasmic membranous staining patterns, was present in 35% (14/40) and 25% (10/40) of DLBCL patients, respectively. High CD44s expression was correlated significantly with non-germinal center B-cell-like types (non-GCB, p=0.004) and patients with old age (p=0.041).
CONCLUSIONS
High CD44s expression may be significantly associated with the non-GCB type compared to the GCB type and may be essential to the prediction of disease outcome in tumor stage III in DLBCL patients.

Prognostic Implication of Programmed Death-1-Positive Tumor-infiltrating Lymphocytes in Diffuse Large B-Cell Lymphoma.: Young Sin Ko, Young Ha Oh, Chan Kum Park, Wook Youn Kim, Hye Seung Han, So Dug Lim, Tae Sook Hwang, Wan Seop Kim; Korean J Pathol. 2011;45(6):573-581.; DOI: https://doi.org/10.4132/KoreanJPathol.2011.45.6.573

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Abstract PDF

BACKGROUND
Programmed death-1 (PD-1) is physiologically expressed by germinal center-associated helper T-cells and has an inhibitory effect on T-cell activity.
METHODS
We examined 63 cases of diffuse large B-cell lymphoma (DLBCL) and determined the number of PD-1-positive helper T-cells in a representative tumor area after immunohistochemical staining using a monoclonal antibody against PD-1. The PD-1-positive cells were counted in 3 high-power fields (HPFs; 400x).
RESULTS
Patients were divided into 2 groups: one with a high number of PD-1-positive cells (>20/HPF, n=33) and one with a low number of PD-1-positive cells (< or =20/HPF, n=30). The former group showed decreased overall survival, but at a statistically non-significant level (p=0.073). A high number of PD-1-positive cells was more common in patients at an advanced clinical stage and with high international prognostic index score (p=0.025 and p=0.026, respectively). The number of extranodal sites also somewhat correlated with the PD-1 staining status (p=0.071). However, the number of PD-1-positive cells was not associated with patient age, serum lactate dehydrogenase level, and Eastern Cooperative Oncology Group performance score.
CONCLUSIONS
The high number of PD-1-positive cells might be associated with an unfavorable outcome in DLBCL patients.

Citations

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Mechanisms of PD-1/PD-L1 expression and prognostic relevance in non-Hodgkin lymphoma: a summary of immunohistochemical studies
Pauline Gravelle, Barbara Burroni, Sarah Péricart, Cédric Rossi, Christine Bezombes, Marie Tosolini, Diane Damotte, Pierre Brousset, Jean-Jacques Fournié, Camille Laurent
Oncotarget.2017; 8(27): 44960. CrossRef
Expression of programmed cell death ligand 1 (PD-L1) in advanced stage EBV-associated extranodal NK/T cell lymphoma is associated with better prognosis
Wook Youn Kim, Ho Young Jung, Soo Jeong Nam, Tae Min Kim, Dae Seog Heo, Chul-Woo Kim, Yoon Kyung Jeon
Virchows Archiv.2016; 469(5): 581. CrossRef

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