Journal of Pathology and Translational Medicine

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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Brief Case Report

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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Neuroendocrine cell micronests of the colon
Richard R. Pacheco, Maria Faraz, Hwajeong Lee
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Large cell neuroendocrine tumor of the gastrointestinal tract with concurrent tubular adenomas
Inayat GILL, Christienne SHAMS, Elisa QUIROZ, Subhashree M. KRISHNAN, Susanna GAIKAZIAN
Gazzetta Medica Italiana Archivio per le Scienze Mediche.2021;[Epub] CrossRef
Neuroendocrine tumor mixed with adenoma in rectum: a case report and literature review
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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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Malignant Rhabdoid Tumor of the Colon: A Case Report
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Tumor rabdoide maligno de colon: a propósito de un caso☆
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Cirugía Española.2014; 92(9): 638. CrossRef

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.

Citations

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BRAF K601E Mutation in Oncocytic Carcinoma of the Thyroid: A Case Report and Literature Review
Antonio Matrone, Fabrizia Citro, Carla Gambale, Alessandro Prete, Elisa Minaldi, Raffaele Ciampi, Teresa Ramone, Gabriele Materazzi, Liborio Torregrossa, Rossella Elisei
Journal of Clinical Medicine.2023; 12(22): 6970. CrossRef
Case of aggressive metastatic follicular variant papillary thyroid carcinoma with BRAF K601E and BCORL1 mutations
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Saudi Journal of Biological Sciences.2015; 22(4): 359. CrossRef
Clinical significance of BRAF V600E mutation in 154 patients with thyroid nodules
LINGYING YU, LIZHEN MA, QIAOFENG TU, YI ZHANG, YUEMING CHEN, DAOJUN YU, SHAOYU YANG
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Clinicopathological Features of Rare BRAF Mutations in Korean Thyroid Cancer Patients
Uiju Cho, Woo Jin Oh, Ja Seong Bae, Sohee Lee, Young Sub Lee, Gyeong Sin Park, Youn Soo Lee, Chan Kwon Jung
Journal of Korean Medical Science.2014; 29(8): 1054. CrossRef
Recurrent Thyroid Papillary Carcinoma in Children Under Ten Years Old: Report of Two Cases and Literature Review
Byeong-Joo Noh, Ji-Youn Sung, Youn-Wha Kim, Yong-Koo Park
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Original Articles

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.

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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
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Clinical Usefulness of SurePath(TM) Liquid-based Cytology in Thyroid Fine Needle Aspiration: Comparison with the Conventional Smear in Diagnostic Efficacy and Applicability of BRAF Mutation Test.: Wook Youn Kim, Sang Hwa Lee, Young Sin Ko, So Dug Lim, Wan Seop Kim, Hye Seung Han, Hye Sil Seol, Seo Young Oh, Won Jin Moon, Tae Sook Hwang; Korean J Pathol. 2011;45(2):188-195.; DOI: https://doi.org/10.4132/KoreanJPathol.2011.45.2.188

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Abstract PDF

BACKGROUND
Recently, liquid-based cytology (LBC) has been introduced as an alternative to the conventional smear (CS) technique in thyroid fine needle aspiration, due to its diagnostic convenience.
METHODS
We assessed 77 cases of thyroid fine needle aspiration using the SurePath(TM) method (SP) as LBC and CS via split-sample techniques. BRAF mutation tests were carried out via polymerase chain reaction and pyrosequencing immediately after diagnosis or a delay of more than one year.
RESULTS
In a comparison between SP and CS, the rate of concordance between SP and CS was as high as 84.4% (kappa value, 0.754). In comparison with histologic diagnosis, the overall sensitivity was 100% for both. The specificity was 62.5% for SP and 56.3% for CS. Relative to CS, papillary carcinomas on SP slides revealed more accentuated nuclear irregularities, nucleoli, and reduced nuclear size. In contrast to CS, the delayed BRAFV600E mutation test using SP slides after 1-2 years failed. The use of new primers amplifying shorter product size could help the delayed test achieve success.
CONCLUSIONS
Differences in the diagnostic efficacy of SP and CS were negligible. The failure of the delayed BRAF mutation test on the SP slides might be associated with DNA degradation.

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Comparison of Liquid-Based Preparations with Conventional Smears in Thyroid Fine-Needle Aspirates: A Systematic Review and Meta-Analysis
Yun Jin Kang, Hyeon Woo Lee, Gulnaz Stybayeva, Se Hwan Hwang
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Thara Keloth, Debasis Gochhait, S Sivaranjani, Neelaiah Siddaraju
Diagnostic Cytopathology.2019; 47(8): 828. CrossRef
DNA degradation in liquid‐based cytology and its comparison with conventional smear
Wook Youn Kim, Seo Young Oh, Hyunkyung Kim, Tae Sook Hwang
Diagnostic Cytopathology.2016; 44(5): 450. CrossRef
Comparison of EASYPREP® and SurePath® in thyroid fine‐needle aspiration
Yosep Chong, Ki Hyun Baek, Jee Young Kim, Tae‐Jung Kim, Eun Jung Lee, Chang Suk Kang
Diagnostic Cytopathology.2016; 44(4): 283. CrossRef
Conventional smears versus liquid-based preparations for thyroid fine-needle aspirates: a systematic review and meta-analysis
Neeraja Nagarajan, Alireza Najafian, Eric B. Schneider, Martha A. Zeiger, Matthew T. Olson
Journal of the American Society of Cytopathology.2015; 4(5): 253. CrossRef
Liquid‐based cytology improves preoperative diagnostic accuracy of the tall cell variant of papillary thyroid carcinoma
Sung Hak Lee, Chan Kwon Jung, Ja Seong Bae, So Lyung Jung, Yeong Jin Choi, Chang Suk Kang
Diagnostic Cytopathology.2014; 42(1): 11. CrossRef
Stability of DNA, RNA, cytomorphology, and immunoantigenicity in Residual ThinPrep® Specimens
Younghye Kim, Kap Ro Choi, Moon Jung Chae, Bong Kyung Shin, Han Kyeom Kim, Aeree Kim, Baek‐hui Kim
APMIS.2013; 121(11): 1064. CrossRef
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A Consideration of MGMT Gene Promotor Methylation Analysis for Glioblastoma Using Methylation-Specific Polymerase Chain Reaction and Pyrosequencing.: Sang Hwa Lee, Tae Sook Hwang, Young Cho Koh, Wook Youn Kim, Hye Seung Han, Wan Seop Kim, Young Sin Ko, So Dug Lim; Korean J Pathol. 2011;45(1):21-29.; DOI: https://doi.org/10.4132/KoreanJPathol.2011.45.1.21

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Abstract PDF

BACKGROUND
O6-methylguanine-DNA methyltransferase (MGMT) gene promoter methylation is currently the most promising predictive marker for the outcome and benefit from temozolomide treatment in patients with glioblastoma, but there is no consensus on the analysis method for assessing the methylation status in the molecular diagnostic field. The objective of this study was to evaluate methylation-specific polymerase chain reaction (MSP) and pyrosequencing methods for assessing MGMT gene promotor methylation of glioblastoma as well as assessing the MGMT protein expression by immunohistochemistry.
METHODS
Twenty-seven cases of glioblastoma from the archives at the Department of Pathology Konkuk University Hospital were selected. MGMT promoter methylation was evaluated by MSP and the pyrosequencing methods. The MGMT expression was also measured at the protein level by immunohistochemistry.
RESULTS
Overall, MGMT hypermethylation was observed in 44.4% (12/27 cases) of the case of glioblastoma using either MSP or pyrosequencing. The concordant rate was 70.3% (19/27 cases) between MSP and pyrosequencing for MGMT methylation. There was no correlation between MGMT methylation and the protein expression. No significant differences in progression free survival and overall survival were seen between the methylated group and the unmethylated group by using either MSP or pyrosequencing. The status of the MGMT protein expression was correlated with progression free survival (p=0.026).
CONCLUSIONS
In this study the concordance rate between MSP and the pyrosequencing methods for assessing MGMT gene promotor methylation was relatively low for the cases of glioblastoma. This suggests that more reliable techniques for routine MGMT methylation study of glioblastoma remain to be developed because of quality control and assurance issues.

Citations

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Prognostic Role of Methylation Status of theMGMTPromoter Determined Quantitatively by Pyrosequencing in Glioblastoma Patients
Dae Cheol Kim, Ki Uk Kim, Young Zoon Kim
Journal of Korean Neurosurgical Society.2016; 59(1): 26. CrossRef
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Child's Nervous System.2012; 28(7): 1025. CrossRef
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The Korean Journal of Pathology.2011; 45(5): 455. CrossRef

Editorial

Molecular Biologic Techniques in Cytopathologic Diagnosis.: Tae Sook Hwang; Korean J Pathol. 2009;43(5):387-392.; DOI: https://doi.org/10.4132/KoreanJPathol.2009.43.5.387

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Abstract PDF

Molecular diagnosis is an application of the knowledge on molecular mechanisms of disease to diagnosis, therapeutic decision-making, and prognostication. Basically any molecular diagnostic technique could be used in molecular diagnostic cytopathology. Currently applicable molecular techniques in the cytopathology field include PCR based molecular techniques (SSCP, DHPLC, RFLP, LOH, MSI, RT-PCR, QRT-PCR, allele-specific PCR, sequencing, and methylation analysis), FISH, cDNA microarray, aCGH, and reverse-phase protein microarray, etc. Exfoliative cytology as well as fine needle aspiration cytology specimen can be used for analysis. In order to obtain a successful result, collection of target cells without contamination of the blood cells, inflammatory cells including histiocytes, and stromal cells, and a good DNA yield are most important. Molecular diagosis finds its full meaning when interpreted by those who can combine the clinical background of the disease with morphological, immunocytochemical, and molecular diagnostic results. Therefore, these assays would fulfill their full potential when interpreted by the cytopathologists.

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PLOS ONE.2020; 15(2): e0228925. CrossRef
Efficiency of EGFR mutation analysis for small microdissected cytological specimens using multitech DNA extraction solution
Seo Young Oh, Hoon Taek Lee
Cancer Cytopathology.2015; 123(7): 401. CrossRef
EGFR Analysis in Cytologic Samples of Lung Adenocarcinoma by Microdissection
Jeong Yeon Han, Hoon Taek Lee, Seo Young Oh
Korean Journal of Clinical Laboratory Science.2015; 47(3): 125. CrossRef
Improved DNA Extraction Method for Molecular Diagnosis from Smaller numbers of Cells
Seo Young Oh, Jeong Yeon Han, So Ra Lee, Hoon Taek Lee
Korean Journal of Clinical Laboratory Science.2014; 46(3): 99. CrossRef
Development of an Ammonium Sulfate DNA Extraction Method for Obtaining Amplifiable DNA in a Small Number of Cells and Its Application to Clinical Specimens
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Case Report

Desmoplastic Small Round Cell Tumor with Ovarian Involvement: A Case Report.: Sang Hwa Lee, Wan Seop Kim, Ji Hoon Kim, Hye Seung Han, So Dug Lim, Sang Yoon Kim, Tae Sook Hwang; Korean J Pathol. 2009;43(2):185-188.; DOI: https://doi.org/10.4132/KoreanJPathol.2009.43.2.185

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Abstract PDF

Desmoplastic small round cell tumor (DSRCT) is a rare, aggressive neoplasm that preferentially involves the abdominal and pelvic cavities in relatively young males. We present a rare case of DSRCT arising in the ovary of a 16-year-old girl. During surgery, a 15 cm-sized huge mass was noted in the right ovary and wide spreading of the tumor was identified in the left ovary, uterine wall, and omentum and bowel wall. Histological investigation showed nests of small round cells with round nuclei and scanty eosinophilic cytoplasm accompanied with dense desmoplastic stroma. The immunohistochemistry showed that the tumor coexpressed epithelial, mesenchymal, and neuronal markers. The tumor cells ultrastructurally showed poorly developed cell junctions and occasionally showed intracytoplasmic aggregates of intermediate filaments. Molecular analysis of the tumor revealed chromosomal translocation t(11:22)(p13;q12) associated with the EWS-WT1 fusion protein. DSRCT should be included in the differential diagnosis of ovarian neoplasms in young patients.

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Desmoplastic small round cell tumor of the ovary
Ravi Hari Phulware, Maitrayee Roy, Neeta Singh, Sunesh Kumar, Sandeep R. Mathur
Indian Journal of Pathology and Microbiology.2021; 64(1): 206. CrossRef

Original Articles

Detection of Mycobacterium tuberculosis DNA in Ethanol-Fixed and Papanicolaou Stained Archival Materials.: Tae Sook Hwang, In Seo Park, Hye Seung Han, Jee Young Han, Young Bae Kim; Korean J Pathol. 1998;32(8):603-607.

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Abstract: Granuloma is a chronic inflammatory process associated with non-infectious agents or infectious diseases such as tuberculosis. It is well known that AFB staining, which has been used to determine the etiology of the granulomatous inflammation, lacks both sensitivity and specificity. Due to the slow growth rate of most pathogenic mycobacteria, culturing of organisms can take up to eight weeks. It is not uncommon for specific therapy to be delayed, or for an inappropriate treatment be given to patients without mycobacterial infections or with infections caused by atypical mycobacteria. Determination of the causative agent in Papanicolaou stained cytology specimens gives pathologists even more difficulties when only necrotic material has been aspirated from the center of the granuloma. In recent years, the use of a polymerase chain reaction for the amplification of DNA has appeared promising in terms of speed, efficiency, sensitivity, and specificity. Since a polymerase chain reaction permits the sensitive genetic analysis of small amounts of tissue, it is ideally suited to the genetic analysis of cytologic specimens. A polymerase chain reaction is easily performed on unfixed and unstained cells, however, an analysis of ethanol fixed and Papanicolaou-stained archival smears has also been described. We have recently established a method to detect Mycobacterium tuberculosis organism by a nested polymerase chain reaction with primers in the insertion sequence IS 6110, using cellular digests of ethanol-fixed and Papanicolaou-stained archival specimens aspirated from the lymph nodes, lungs, thyroid, etc. Inhibitors present in Papanicolaou stained material was removed by destaining the slides with 0.5% HCl solution for 10-30 minutes. Eight out of ten cases which have shown the epithelioid granulomas revealed a positive reaction and four out of ten cases which have shown lymphohistiocytic cells in a necrotic background without any evidence of granuloma revealed a positive reaction. This study showed that it was possible to employ a polymerase chain reaction to detect Mycobacterium tuberculosis in Papanicolaou stained archival cytology specimens.

The Value of Immunohistochemistry on Paraffin Embedded Tissue Sections in the Differentiation of Subgroups of Low Grade B-Cell Lymphomas.: Tae Sook Hwang, Seung Sook Lee, Ji Eun Kim, Hye Seung Han, Chul Woo Kim; Korean J Pathol. 1998;32(12):1066-1073.

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Abstract: There had been a continuous evolution of lymphoma classification and recently a Revised European-American Lymphoma Classification was proposed by the International Lymphoma Study Group. This new classification often requires information on immunophenotypic and molecular biologic markers in addition to the usual histologic findings. Recent advances in the production of commercially available monoclonal antibodies reactive on formalin-fixed paraffin-embedded tissues provide us a great help to classify the non-Hodgkin's lymphoma. We have analyzed 31 low grade B-cell lymphomas by the schemes proposed by the International Lymphoma Study Group using antibodies to CD3, CD5, CD20, CD23, CD43, cyclin D1, and bcl-2 protein, and have analyzed the immunophenotypic features. Among 31 low grade B-cell lymphomas, 8 small lymphocytic lymphomas, 5 mantle cell lymphomas, 7 follicle center lymphomas (2 grade I, 3 grade II, and 2 grade III), and 11 marginal zone B-cell lymphomas (all of which were extranodal) were identified. Among 8 small lymphocytic lymphomas, 5 cases were positive for CD5; 6 cases were positive for CD23; 7 cases were positive for CD43; all 8 cases were negative for cyclin D1; and 7 cases were positive for bcl-2. Among 5 mantle cell lymphomas, 4 cases were positive for CD5 and CD43; all five cases were negative for CD23; 4 cases were positive for cyclin D1 and bcl-2. All 7 follicle center lymphomas were negative for CD5, CD43 and cyclin D1 and 2 cases were positive for CD23; and 6 cases were positive for bcl-2. All marginal zone B-cell lymphomas were negative for CD5, CD23 and cyclin D1; 3 cases were positive for CD43 and 9 cases were positive for bcl-2. Diagnostic utility for CD5 antigen detection on paraffin embedded tissue has a limitation due to weak antigen expression in tumor cells of B-cell lymphomas; however, still be useful in differentiating small lymphocytic lymphoma and mantle cell lymphoma from other B-cell lymphomas when applied in conjunction with CD43. CD23, CD43, and cyclin D1 appear to be of great help in differentiating subgroups of low grade B-cell lymphomas. Bcl-2, as known, is found to be useful to rule out reactive follicular hyperplasia.

Expression of Insulin-like Growth Factor-I-Receptor in Colorectal Adenomas and Carcinomas.: Young Chae Chu, Hye Seung Han, Jee Young Han, Joon Mee Kim, Young Bae Kim, Tae Sook Hwang; Korean J Pathol. 2000;34(3):199-207.

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Abstract PDF: The activation of the insulin-like growth factor-I-receptor system (IGF-IR) has recently emerged as critical events in transformation and tumorigenicity of several human tumors. In this study we investigated the expression of IGF-IR in 33 colorectal adenomas, 88 primary colorectal carcinomas, and 30 normal colonic mucosa adjacent to the carcinoma. Immunohistochemical staining (IHC) for IGF-IR was performed on paraffin embedded sections using an anti-IGF-IR rabbit polyclonal antibody. IHC stains for IGF-IR were scored using a semiquantitative scoring system. The relationship of IGF-IR staining to clinicopathologic variables and proliferating cell nuclear antigen (PCNA) staining was also analysed. The mean IHC scores for IGF-IR of normal glands, adenoma, intramucosal carcinoma, node-negative carcinoma, and node-positive carcinoma were 0.41 0.96, 0.76 1.23, 2.0 1.48, 2.83 2.0 and 5.93 1.58, respectively. These scores for each category were statistically significant except between normal glands and adenoma and between intramucosal carcinoma and node-negative carcinomas. The mean PCNA indexes of normal glands, adenoma, intramucosal carcinoma, node-negative carcinoma, and node-positive carcinoma were 2.48 2.60, 6.94 11.03, 27.21 11.42, 43.36 9.9 and 57.60 10.01, respectively. The PCNA index for each category was statistically significant except between normal and adenoma. IGF-IR scores and PCNA indexes were higher with tumor progression and also correlated each other (sr=0.65, p=0.0001). Higher IGF-IR scores and PCNA indexes were seen in tumors with advanced stage, infiltrative growth pattern, poor differentiation, nerve invasion, lymphovascular invasion, and moderate fibrosis. Our results suggest that IGF-IR plays an important role in tumorigenicity and tumor progression.

Prostatic Intraepithelial Neoplasia in Transurethral Resection Specimens On serum PSA and histologic findings.: Joon Mee Kim, Soo Kee Min, Young Chae Chu, Tae Sook Hwang, Young Bae Kim, Jee Young Han, Tae Sook Kim, Hye Seung Han; Korean J Pathol. 2000;34(5):349-357.

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Abstract PDF: Prostatic intraepithelial neoplasia (PIN), which is divided into low and high grade, has different clinicopathologic significance. We reviewed 158 prostatic tissues, which consisted of 144 cases of nodular hyperplasias and 14 cases of adenocarcinomas, to evaluate incidence of PIN, its histologic finding, and its clinical significance. Ten cases of PIN, 4 low grade and 6 high grade, were found. Four cases of low grade PIN (LPIN) and five cases of high grade PIN (HPIN) were associated with nodular hyperplasia. Only one case of HPIN occurred in carcinoma. The constant histologic findings of LPIN were nuclear stratification and nucleomegaly. The most prominent characteristics of HPIN were hyperchromasia and prominent nucleoli. Anisonucleosis was not so helpful for differential diagnosis between LPIN and HPIN. Basal layer disruption was present in one case of high grade PIN associated with adenocarcinoma, and important for the differentiatial diagnosis of cribriform HPIN from the cribriform adenocarcinoma. There was no significant difference in age incidence between the two groups with the mean age of 70.9 years in nodular hyperplasia and 69.4 years in adenocarcinoma. Serum PSA level was significantly different between the two group with the mean PSA value of 11.03 ng/ml in nodular hyperplasia and that of 73.76 ng/ml in carcinoma (p=0.000). However, PSA values between "nodular hyperplasia only" group and "PIN associated nodular hyperplasia" group were not significantly different. PIN association changed neither age distribution nor serum PSA level. During the follow up period, no adenocacinoma has occurred in the cases having PIN although serum PSA level has elevated in some cases. One case of adenocarcinoma associated with HPIN developed in the nodular hyperplasia patient. Although PIN did not increase the possibility of subsequent prostatic adenocarcinoma in transurethral resection specimens, it could not be excluded that PIN was a precursor of prostatic adenocarcinoma.

Case Report

Endobronchial Actinomycosis: A report of two cases.: Hye Seung Han, Kwang Ho Kim, In Seo Park, Jee Young Han, Young Bae Kim, Tae Sook Hwang, Young Chae Chu; Korean J Pathol. 2000;34(6):465-470.

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Abstract PDF: Actinomycosis causes a chronic suppurative infection most commonly involving the cervico-facial region, thorax, and the abdomen. Thoracic infection results from an aspiration of contaminated material from mouth or oropharynx. Actinomyces was known to have a predilection for the periphery of the lung and the endobronchial lesion is extremely rare. We report two cases of actinomycosis presenting as an endobronchial mass which arose in 53-year-old and 44-year-old women. The first case presented with cough, sputum, weight loss and had a history of pulmonary tuberculosis 24 years ago. Chest CT revealed a right lobe collapse simulating mass and suggested carcinoma. The second case presented with hemoptysis for 2 years. Chest CT revealed cystic bronchiectasis of both lungs and intracystic soft tissue mass in the anterior segment of the right upper lobe which suggested aspergilloma. The gross features of them were similar to those of aspergilloma. Characteristic sulphur granules consisting of a granular basophilic center surrounded by a radiating zone of eosinophilic, hyaline, club-shaped projection were histologically confirmed in both cases. Granulomas containing P. westermani eggs were present in the second case. Staphylococcus, true fungal organism, nocardia, and streptomyces shoud be distinguished by analysing their morphologic characteristics in the appropriate stains. Actinomycosis should be included in the differential diagnoses of an endobronchial mass.

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