Journal of Pathology and Translational Medicine

So Dug Lim

6 Articles

Fatty acid synthetase expression in triple-negative breast cancer: Jin Hee Park, Hye Seung Han, So Dug Lim, Wook Youn Kim, Kyoung Sik Park, Young Bum Yoo, Seung Eun Lee, Wan-Seop Kim; J Pathol Transl Med. 2022;56(2):73-80. Published online January 21, 2022; DOI: https://doi.org/10.4132/jptm.2021.10.27

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Background
Triple-negative breast cancer (TNBC) has a relatively poor prognosis. Research has identified potential metabolic targets, including fatty acid metabolism, in TNBC. The absence of effective target therapies for TNBC led to exploration of the role of fatty acid synthetase (FASN) as a potential target for TNBC therapy. Here, we analyzed the expression of FASN, a representative lipid metabolism–related protein, and investigated the association between FASN expression and Ki-67 and the programmed death ligand 1 (PD-L1) biomarkers in TNBC.
Methods
Immunohistochemical expression of FASN was analyzed in 166 patients with TNBC. For analytical purposes, patients with 0–1+ FASN staining were grouped as low-grade FASN and patients with 2–3+ FASN staining as high-grade FASN.
Results
FASN expression was observed in 47.1% of TNBC patients. Low and high expression of FASN was identified in 75.9% and 24.1%, respectively, and no statistically significant difference was found in T category, N category, American Joint Committee on Cancer stage, or recurrence rate between the low and high-FASN expression groups. Ki-67 proliferation level was significantly different between the low and high-FASN expression groups. FASN expression was significantly related to Ki-67 as the level increased. There was no significant difference in PD-L1 positivity between the low- and high-FASN expression groups.
Conclusions
We identified FASN expression in 166 TNBC patients. The Ki-67 proliferation index was positively correlated with FASN level, indicating higher proliferation activity as FASN increases. However, there was no statistical association with PD-L1 SP142, the currently FDA-approved assay, or FASN expression level.

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Neuroendocrine Dysplasia Combined in a Tubular Adenoma of Rectum: A Case Report: So-Young Lee, Dae-Yong Hwang, Tae Sook Hwang, Wan-Seop Kim, So Dug Lim, Wook Youn Kim, Se-Hun Kim, Hye Seung Han; Korean J Pathol. 2013;47(5):495-498. Published online October 25, 2013; DOI: https://doi.org/10.4132/KoreanJPathol.2013.47.5.495

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Large cell neuroendocrine tumor of the gastrointestinal tract with concurrent tubular adenomas
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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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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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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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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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