Journal of Pathology and Translational Medicine

Hyojin Kim

14 Articles

Biomarker testing of cytology specimens in personalized medicine for lung cancer patients: Hyojin Kim, Jin-Haeng Chung; J Pathol Transl Med. 2022;56(6):326-333. Published online November 9, 2022; DOI: https://doi.org/10.4132/jptm.2022.10.17

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Abstract PDF: Every patient with advanced non–small cell lung cancer (NSCLC) should be tested for targetable driver mutations and gene arrangements that may open avenues for targeted therapy. As most patients with NSCLC in the advanced stage of the disease are not candidates for surgery, these tests have to be performed on small biopsies or cytology samples. A growing number of other genetic changes with targetable mutations may be treatable in the near future. To identify patients who might benefit from novel targeted therapy, relevant markers should be tested in an appropriate context. In addition, immunotherapy of lung cancer is guided by the status of programmed death-ligand 1 expression in tumor cells. The variety and versatility of cytological specimen preparations offer significant advantages for molecular testing; however, they frequently remain underused. Therefore, evaluating the utility and adequacy of cytologic specimens is important, not only from a lung cancer diagnosis, but also for the large number of ancillary studies that are necessary to provide appropriate clinical management. A large proportion of lung cancers is diagnosed by aspiration or exfoliative cytology specimens; thus, optimizing strategies to triage and best use the tissue for diagnosis and biomarker studies forms a critical component of lung cancer management. In this review, we discuss the opportunities and challenges of using cytologic specimens for biomarker testing of lung cancer and the role of cytopathology in the molecular era.

Landscape of EGFR mutations in lung adenocarcinoma: a single institute experience with comparison of PANAMutyper testing and targeted next-generation sequencing: Jeonghyo Lee, Yeon Bi Han, Hyun Jung Kwon, Song Kook Lee, Hyojin Kim, Jin-Haeng Chung; J Pathol Transl Med. 2022;56(5):249-259. Published online September 13, 2022; DOI: https://doi.org/10.4132/jptm.2022.06.11

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Abstract PDF Supplementary Material: Background
Activating mutations in the tyrosine kinase domain of epidermal growth factor receptor (EGFR) are predictive biomarkers for response to EGFR–tyrosine kinase inhibitor (TKI) therapy in lung adenocarcinoma (LUAD). Here, we characterized the clinicopathologic features associated with EGFR mutations via peptide nucleic acid clamping-assisted fluorescence melting curve analysis (PANAMutyper) and evaluated the feasibility of targeted deep sequencing for detecting the mutations.
Methods
We examined EGFR mutations in exons 18 through 21 for 2,088 LUADs from July 2017 to April 2020 using PANAMutyper. Of these, we performed targeted deep sequencing in 73 patients and evaluated EGFR-mutation status and TKI clinical response.
Results
EGFR mutation was identified in 55.7% of LUADs by PANAMutyper, with mutation rates higher in females (69.3%) and never smokers (67.1%) and highest in the age range of 50 to 59 years (64.9%). For the 73 patients evaluated using both methods, next-generation sequencing (NGS) identified EGFR mutation–positive results in 14 of 61 patients (23.0%) who were EGFR-negative according to PANAMutyper testing. Of the 10 patients reportedly harboring a sensitizing mutation according to NGS, seven received TKI treatment, with all showing partial response or stable disease. In the 12 PANAMutyper-positive cases, NGS identified two additional mutations in exon 18, whereas a discordant negative result was observed in two cases.
Conclusions
Although PANAMutyper identified high frequencies of EGFR mutations, targeted deep sequencing revealed additional uncommon EGFR mutations. These findings suggested that appropriate use of NGS may benefit LUAD patients with otherwise negative screening test results.

Correction of acknowledgments: PD-L1 testing in non-small cell lung cancer: past, present, and future: Hyojin Kim, Jin-Haeng Chung; J Pathol Transl Med. 2020;54(2):196-196. Published online March 10, 2020; DOI: https://doi.org/10.4132/jptm.2020.02.17; Corrects: J Pathol Transl Med 2019;53(4):199

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Liquid-Based Cytology Features of Papillary Squamotransitional Cell Carcinoma of the Uterine Cervix: Yangkyu Lee, Younghwa Choi, Kiryang Lee, Youngeun Lee, Hyojin Kim, Ji-Young Choe, Hye Seung Lee, Yong Beom Kim, Haeryoung Kim; J Pathol Transl Med. 2019;53(5):341-344. Published online June 24, 2019; DOI: https://doi.org/10.4132/jptm.2019.06.05

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Local and Metastatic Relapses in a Young Woman with Papillary Squamous Cell Carcinoma of the Uterine Cervix
Ha Young Woo, Hyun-Soo Kim
Diagnostics.2022; 12(3): 599. CrossRef

PD-L1 Testing in Non-small Cell Lung Cancer: Past, Present, and Future: Hyojin Kim, Jin-Haeng Chung; J Pathol Transl Med. 2019;53(4):199-206. Published online May 2, 2019; DOI: https://doi.org/10.4132/jptm.2019.04.24; Correction in: J Pathol Transl Med 2020;54(2):196

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Blockade of the programmed cell death-1 (PD-1) axis has already been established as an effective treatment of non-small cell lung cancer. Immunohistochemistry (IHC) for programmed death-ligand 1 (PD-L1) protein is the only available biomarker that can guide treatment with immune checkpoint inhibitors in non-small cell lung cancer. Because each PD-1/PD-L1 blockade was approved together with a specific PD-L1 IHC assay used in the clinical trials, pathologists have been challenged with performing various assays with a limited sample. To provide a more unified understanding of this, several cross-validation studies between platforms have been performed and showed consistent results. However, the interchangeability of assays may be limited in practice because of the risk of misclassification of patients for the treatment. Furthermore, several issues, including the temporal and spatial heterogeneity of PD-L1 expression in the tumor, and the potential for cytology specimens to be used as an alternative to tissue samples for PD-L1 testing, have still not been resolved. In the future, one of the main aims of immunotherapy research should be to find a novel predictive biomarker for PD-1 blockade therapy and a way to combine it with PD-L1 IHC and other tests.

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Human Leukocyte Antigen Class I and Programmed Death-Ligand 1 Coexpression Is an Independent Poor Prognostic Factor in Adenocarcinoma of the Lung: Yeon Bi Han, Hyun Jung Kwon, Soo Young Park, Eun-Sun Kim, Hyojin Kim, Jin-Haeng Chung; J Pathol Transl Med. 2019;53(2):86-93. Published online January 14, 2019; DOI: https://doi.org/10.4132/jptm.2018.12.26

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Background
Both human leukocyte antigen (HLA) class I and programmed death-ligand 1 (PD-L1) molecules are known to play important roles in cancer immunity. In this study, we evaluated HLA class I expression in resected adenocarcinoma of the lung, and investigated its prognostic impact in correlation with PD-L1 expression.
Methods
HLA class I and PD-L1 expression was evaluated by immunohistochemistry in a total of 403 resected lung adenocarcinomas using tissue microarray. Correlations between the expression of HLA class I/PD-L1 and clinicopathologic features and prognostic significance were analyzed.
Results
HLA class I expression was reduced in 91.6% of adenocarcinoma, and more frequently reduced in patients with younger age, absence of vascular invasion, and low pathologic stage (p = .033, p = .007, and p = .012, respectively). Positive PD-L1 expression in tumor cells was 16.1% (1% cut-off), and associated with poor differentiation, presence of vascular invasion and nodal metastasis (p < .001, p = .002, and p = .032, respectively). On survival analysis, HLA class I or PD-L1 expression alone did not show any statistical significance. On the integrated analysis, HLA class I (+)/PD-L1 (+) subgroup showed a significantly shorter overall survival than other groups (p = .001). Multivariate analysis revealed that coexpression of HLA class I and PD-L1 was an independent poor prognostic factor of lung adenocarcinoma. (p < .001; hazard ratio, 6.106; 95% confidence interval, 2.260 to 16.501).
Conclusions
Lung adenocarcinoma with coexpression of HLA class I and PD-L1 was associated with poor prognosis. This subgroup may evade immune attack by expressing PD-L1 protein despite HLA expression.

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Loss of HLA-class-I expression in non-small-cell lung cancer: Association with prognosis and anaerobic metabolism
Ioannis M. Koukourakis, Alexandra Giatromanolaki, Achilleas Mitrakas, Michael I. Koukourakis
Cellular Immunology.2022; 373: 104495. CrossRef

Osteosarcomatous Differentiation in Rebiopsy Specimens of Pulmonary Adenocarcinoma with EGFR-TKI Resistance: Hyein Ahn, Hyun Jung Kwon, Eunhyang Park, Hyojin Kim, Jin-Haeng Chung; J Pathol Transl Med. 2018;52(2):130-132. Published online April 4, 2017; DOI: https://doi.org/10.4132/jptm.2016.11.17

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Adipogenesis induces growth inhibition of dedifferentiated liposarcoma
Yu Jin Kim, Dan Bi Yu, Mingi Kim, Yoon‐La Choi
Cancer Science.2019; 110(8): 2676. CrossRef

Aquaporin 1 Is an Independent Marker of Poor Prognosis in Lung Adenocarcinoma: Sumi Yun, Ping-Li Sun, Yan Jin, Hyojin Kim, Eunhyang Park, Soo Young Park, Kyuho Lee, Kyoungyul Lee, Jin-Haeng Chung; J Pathol Transl Med. 2016;50(4):251-257. Published online June 7, 2016; DOI: https://doi.org/10.4132/jptm.2016.03.30

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Abstract PDF

Background
Aquaporin 1 (AQP1) overexpression has been shown to be associated with uncontrolled cell replication, invasion, migration, and tumor metastasis. We aimed to evaluate AQP1 expression in lung adenocarcinomas and to examine its association with clinicopathological features and prognostic significance. We also investigated the association between AQP1 overexpression and epithelial-mesenchymal transition (EMT) markers.
Methods
We examined AQP1 expression in 505 cases of surgically resected lung adenocarcinomas acquired at the Seoul National University Bundang Hospital from 2003 to 2012. Expression of AQP1 and EMT-related markers, including Ecadherin and vimentin, were analyzed by immunohistochemistry and tissue microarray.
Results
AQP1 overexpression was associated with several aggressive pathological parameters, including venous invasion, lymphatic invasion, and tumor recurrence. AQP1 overexpression tended to be associated with higher histological grade, advanced pathological stage, and anaplastic lymphoma kinase (ALK) translocation; however, these differences were not statistically significant. In addition, AQP1 overexpression positively correlated with loss of E-cadherin expression and acquired expression of vimentin. Lung adenocarcinoma patients with AQP1 overexpression showed shorter progression- free survival (PFS, 46.1 months vs. 56.2 months) compared to patients without AQP1 overexpression. Multivariate analysis confirmed that AQP1 overexpression was significantly associated with shorter PFS (hazard ratio, 1.429; 95% confidence interval, 1.033 to 1.977; p=.031).
Conclusions
AQP1 overexpression was thereby concluded to be an independent factor of poor prognosis associated with shorter PFS in lung adenocarcinoma. These results suggested that AQP1 overexpression might be considered as a prognostic biomarker of lung adenocarcinoma.

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Membranous Insulin-like Growth Factor-1 Receptor (IGF1R) Expression Is Predictive of Poor Prognosis in Patients with Epidermal Growth Factor Receptor (EGFR)-Mutant Lung Adenocarcinoma: Eunhyang Park, Soo Young Park, Hyojin Kim, Ping-Li Sun, Yan Jin, Suk Ki Cho, Kwhanmien Kim, Choon-Taek Lee, Jin-Haeng Chung; J Pathol Transl Med. 2015;49(5):382-388. Published online August 4, 2015; DOI: https://doi.org/10.4132/jptm.2015.07.10

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Background
Insulin-like growth factor-1 receptor (IGF1R) is a membrane receptor-type tyrosine kinase that has attracted considerable attention as a potential therapeutic target, although its clinical significance in non-small cell lung cancer (NSCLC) is controversial. This study aimed to clarify the clinical significance of IGF1R expression in human NSCLC. Methods: IGF1R protein expression was evaluated using immunohistochemistry in 372 patients with NSCLC who underwent curative surgical resection (146 squamous cell carcinomas [SqCCs] and 226 adenocarcinomas [ADCs]). We then analyzed correlations between expression of IGF1R and clinicopathological and molecular features and prognostic significance. Results: Membranous and cytoplasmic IGF1R expression were significantly higher in SqCCs than in ADCs. In patients with SqCC, membranous IGF1R expression was associated with absence of vascular, lymphatic, and perineural invasion; lower stage; and better progression-free survival (PFS) (hazard ratio [HR], 0.586; p = .040). In patients with ADC, IGF1R expression did not have a significant prognostic value; however, in the subgroup of epidermal growth factor receptor (EGFR)-mutant ADC, membranous IGF1R expression was associated with lymphatic and perineural invasion, solid predominant histology, and higher cancer stage and was significantly associated with worse PFS (HR, 2.582; p = .009). Conclusions: Lung ADC and SqCC showed distinct IGF1R expression profiles that demonstrated prognostic significance. High membranous IGF1R expression was predictive of poor PFS in EGFR-mutant lung ADC, while it was predictive of better PFS in SqCC. These findings will help improve study design for subsequent investigations and select patients for future anti-IGF1R therapy.

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Heterotopic Pancreas in Omphalomesenteric Duct Remnant Results in Persistent Umbilical Discharge: Eunhyang Park, Hyojin Kim, Kyu Whan Jung, Jin-Haeng Chung; Korean J Pathol. 2014;48(4):323-326. Published online August 26, 2014; DOI: https://doi.org/10.4132/KoreanJPathol.2014.48.4.323

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Guideline Recommendations for Testing of ALK Gene Rearrangement in Lung Cancer: A Proposal of the Korean Cardiopulmonary Pathology Study Group: Hyojin Kim, Hyo Sup Shim, Lucia Kim, Tae-Jung Kim, Kun Young Kwon, Geon Kook Lee, Jin-Haeng Chung; Korean J Pathol. 2014;48(1):1-9. Published online February 25, 2014; DOI: https://doi.org/10.4132/KoreanJPathol.2014.48.1.1

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Abstract PDF

Rearrangement of anaplastic lymphoma kinase (ALK) gene is the best predictor of response to crizotinib, an ALK tyrosine kinase inhibitor. However, the prevalence of the ALK fusion is low, so accurate patient identification is crucial for successful treatment using ALK inhibitors. Furthermore, most patients with lung cancer present with advanced-stage disease at the time of diagnosis, so it is important for pathologists to detect ALK-rearranged patients while effectively maximizing small biopsy or cytology specimens. In this review, we propose a guideline recommendation for ALK testing approved by the Cardiopulmonary Pathology Study Group of the Korean Society of Pathologists.

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Comparison of Direct Sequencing, PNA Clamping-Real Time Polymerase Chain Reaction, and Pyrosequencing Methods for the Detection of EGFR Mutations in Non-small Cell Lung Carcinoma and the Correlation with Clinical Responses to EGFR Tyrosin: Hyun Ju Lee, Xianhua Xu, Hyojin Kim, Yan Jin, Pingli Sun, Ji Eun Kim, Jin-Haeng Chung; Korean J Pathol. 2013;47(1):52-60. Published online February 25, 2013; DOI: https://doi.org/10.4132/KoreanJPathol.2013.47.1.52

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Abstract PDF

Background

The aims of this study were to evaluate the abilities of direct sequencing (DS), peptide nucleic acid (PNA) clamping, and pyrosequencing methods to detect epidermal growth factor receptor (EGFR) mutations in formalin-fixed paraffin-embedded (FFPE) non-small cell lung carcinoma (NSCLC) samples and to correlate EGFR mutational status as determined by each method with the clinical response to EGFR tyrosine kinase inhibitors (TKIs).

Methods

Sixty-one NSCLC patients treated with EGFR TKIs were identified to investigate somatic mutations in the EGFR gene (exons 18-21).

Results

Mutations in the EGFR gene were detected in 38 of the 61 patients (62%) by DS, 35 (57%) by PNA clamping and 37 (61%) by pyrosequencing. A total of 44 mutations (72%) were found by at least one of the three methods, and the concordances among the results were relatively high (82-85%; kappa coefficient, 0.713 to 0.736). There were 15 discordant cases (25%) among the three different methods.

Conclusions

All three EGFR mutation tests had good concordance rates (over 82%) for FFPE samples. These results suggest that if the DNA quality and enrichment of tumor cells are assured, then DS, PNA clamping, and pyrosequencing are appropriate methods for the detection of EGFR mutations.

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Korean Journal of Pathology.2014; 48(2): 100. CrossRef
Guideline Recommendations forEGFRMutation Testing in Lung Cancer: Proposal of the Korean Cardiopulmonary Pathology Study Group
Hyo Sup Shim, Jin-Haeng Chung, Lucia Kim, Sunhee Chang, Wan-Seop Kim, Geon Kook Lee, Soon-Hee Jung, Se Jin Jang
Korean Journal of Pathology.2013; 47(2): 100. CrossRef
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Alteration of the E-Cadherin/β-Catenin Complex Is an Independent Poor Prognostic Factor in Lung Adenocarcinoma: Hyojin Kim, Seol Bong Yoo, Pingli Sun, Yan Jin, Sanghoon Jheon, Choon Taek Lee, Jin-Haeng Chung; Korean J Pathol. 2013;47(1):44-51. Published online February 25, 2013; DOI: https://doi.org/10.4132/KoreanJPathol.2013.47.1.44

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Abstract PDF

Background

Epithelial-mesenchymal transition (EMT) is an important step in the invasion and progression of cancer and in the development of chemoresistance by cancer cells.

Methods

To address the clinical significance of the EMT pathway in lung adenocarcinoma and the association of the pathway with histological subtype, we examined 193 surgically resected lung adenocarcinoma samples for the expression of representative EMT-related proteins (E-cadherin, β-catenin, and vimentin) by immunohistochemistry. Histological subtypes were classified according to the 2011 International Association for the Study of Lung Cancer/American Thoracic Society/European Respiratory Society classification. The results for EMT-related protein expression were analyzed for correlation with clinicopathological features and with survival.

Results

The loss of E-cadherin expression and aberrant β-catenin expression were significantly associated with larger tumor size, pleural invasion, lymphatic/vascular invasion, and advanced pathological stage (p<0.05). The alteration of the E-cadherin/β-catenin complex was least frequently observed in the lepidic-predominant group, but these associations were not statistically significant. In the multivariate analysis, altered E-cadherin/β-catenin complex expression was found to be an independent poor prognostic factor (p=0.017; hazard ratio, 1.926; 95% confidence interval, 1.119 to 3.314).

Conclusions

The alteration of the expression of the E-cadherin/β-catenin complex was associated with aggressive tumor behavior in lung adenocarcinoma.

Citations

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