Journal of Pathology and Translational Medicine

Hyung Bae Moon

19 Articles

WHO Classification of Malignant Lymphomas in Korea: Report of the Third Nationwide Study.: Jin Man Kim, Young Hyeh Ko, Seung Sook Lee, Jooryung Huh, Chang Suk Kang, Chul Woo Kim, Yun Kyung Kang, Jai Hyang Go, Min Kyung Kim, Wan Seop Kim, Yoon Jung Kim, Hyun Jung Kim, Hee Kyung Kim, Jong Hee Nam, Hyung Bae Moon, Chan Kum Park, Tae In Park, Young Ha Oh, Dong Wha Lee, Jong Sil Lee, Juhie Lee, Hyekyung Lee, Sung Chul Lim, Kyu Yun Jang, Hee Kyung Chang, Yoon Kyung Jeon, Hye Ra Jung, Min Sun Cho, Hee Jeong Cha, Suk Jin Choi, Jae Ho Han, Sook Hee Hong, Insun Kim; Korean J Pathol. 2011;45(3):254-260.; DOI: https://doi.org/10.4132/KoreanJPathol.2011.45.3.254

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BACKGROUND
The aim of study was to determine the relative frequency of malignant lymphoma according to World Health Organization (WHO) classification in Korea.
METHODS
A total of 3,998 cases diagnosed at 31 institutes between 2005 and 2006 were enrolled. Information including age, gender, pathologic diagnosis, site of involvement and immunophenotypes were obtained.
RESULTS
The relative frequency of non-Hodgkin lymphoma (NHL) and Hodgkin lymphoma (HL) was 95.4% and 4.6%, respectively. B-cell lymphomas accounted for 77.6% of all NHL, while T/natural killer (T/NK)-cell lymphomas accounted for 22.4%. The most frequent subtypes of NHL were diffuse large B-cell lymphoma (42.7%), extranodal marginal zone B-cell lymphoma (MZBCL) of mucosa-associated lymphoid tissue (19.0%), NK/T-cell lymphoma (6.3%) and peripheral T-cell lymphoma (PTCL), unspecified (6.3%), in decreasing order. The relative frequency of HL was nodular sclerosis (47.4%), mixed cellularity (30.6%), and nodular lymphocyte predominant (12.1%) subtypes. Compared with a previous study in 1998, increase in gastric MZBCL and nodular sclerosis HL, and slight decrease of follicular lymphoma, PTCL, and NK/T-cell lymphoma were observed.
CONCLUSIONS
Korea had lower rates of HL and follicular lymphoma, and higher rates of extranodal NHL, extranodal MZBCL, and NK/T-cell lymphoma of nasal type compared with Western countries. Changes in the relative frequency of lymphoma subtypes are likely ascribed to refined diagnostic criteria and a change in national health care policy.

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Korean Pediatric/Adolescent Lymphoma: Incidence and Pathologic Characteristics.: Seung Sook Lee, Jin Man Kim, Young Hyeh Ko, Jooryung Huh, Chang Suk Kang, Chul Woo Kim, Yun Kyung Kang, Jai Hyang Go, Min Kyung Kim, Wan Seop Kim, Yoon Jung Kim, Hyun Jung Kim, Hee Kyung Kim, Jong Hee Nam, Hyung Bae Moon, Chan Kum Park, Tae In Park, Young Ha Oh, Dong Wha Lee, Jong Sil Lee, Juhie Lee, Hyekyung Lee, Sung Chul Lim, Kyu Yun Jang, Hee Kyung Chang, Yoon Kyung Jeon, Hye Ra Jung, Min Sun Cho, Hee Jeong Cha, Suk Jin Choi, Jae Ho Han, Sook Hee Hong, Insun Kim; Korean J Pathol. 2010;44(2):117-124.; DOI: https://doi.org/10.4132/KoreanJPathol.2010.44.2.117

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Abstract PDF

BACKGROUND
The Hematopathology Study Group of the Korean Society of Pathologists conducted a nation-wide retrospective analysis of Korean pediatric lymphoma, to provide pathologic data on pediatric/adolescent lymphoma subtypes and features.
METHODS
All lymphoma cases of all age groups were collected during a recent 2 year-period (2005-2006) from 32 institutes in Korea. Among 3,686 lymphoma patients, 142 who were age 18 or less were classified according to the World Health Organization (WHO) classification.
RESULTS
Among 142 pediatric/adolescent lymphoma patients, Hodgkin lymphoma accounted for 21 (14.8%) and non-Hodgkin lymphoma (NHL) for 121 (85.2%). Hodgkin lymphoma appears to be more common in the pediatric/adolescent age group than in the all-ages group (14.8% vs 4.4%). T- and natural killer cell-NHL was more common in the pediatric/adolescent age group than in the all ages group (46.3% vs 22%). The majority of Korean pediatric/adolescent NHL cases was composed of Burkitt lymphoma, T- or B-lymphoblastic lymphoma, anaplastic large-cell lymphoma, and diffuse large B-cell lymphoma. For lymphoma patients under the age of 6 years, most had B-lymphoblastic or Burkitt lymphoma, which commonly presented at extranodal sites.
CONCLUSIONS
The distribution of lymphoma subtypes in the pediatric/adolescent age group is quite different from the distribution of adults, but it was quite similar to distribution in Western countries.

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A Case of Nasal Type Extranodal NK/T Cell Lymphoma Incidentally Detected in a Child
Ha Jin Oh, Sang Hyun Park, Hae In Jang, Dong Hoon Lee, Yoo Duk Choi, Hee Jo Baek, Hoon Kook
Clinical Pediatric Hematology-Oncology.2015; 22(1): 76. CrossRef

Extraskeletal Osteosarcoma of the Posterior Mediastinum: A Case Report.: Weon Cheol Han, Hyang Jung Cho, Jai Kyoo Lee, Hyung Bae Moon, Jae Y Ro; Korean J Pathol. 2004;38(5):350-352.

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Abstract PDF: Extraskeletal osteosarcoma is a rare malignant tumor of soft tissue. In addition, there are only several cases of osteosarcoma of the mediastinum as a primary site in the world. We report a case of extraskeletal osteosarcoma arising in the posterior mediastinum. A 54-year-old man visited our hospital because of chest pain. Chest CT showed a 12 cm sized huge mediastinal mass. The mass revealed solid and ivory-colored cut surface with multifocally ovoid cystic spaces and hemorrhage. Microscopically, the tumor consisted of polygonal stromal cells, giant cells and varying amounts of neoplastic new bone, and mitotic figures were frequently observed. There were no distant metastasis and regional lymph node involvement.

Expression of p21, p53 and bcl-2 Proteins in Invasive Ductal Carcinoma of the Breast.: Hyang Jeong Jo, Ki Jung Yun, Hyung Bae Moon; Korean J Pathol. 2003;37(6):393-399.

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Abstract PDF: BACKGROUND
This study was designed to investigate the prognostic significance of p21, p53, and bcl-2 proteins in invasive ductal carcinoma of the breast.
METHODS
Seventy-two cases of invasive ductal carcinoma were examined by immunohistochemical staining for p21, p53 and bcl-2 proteins. The results were correlated with clinicopathological variables, including age, tumor size, histologic grade, nuclear grade, lymph node status, estrogen receptor (ER) and progesterone receptor (PR) expression.
RESULTS
Of 72 cases, p21, p53 and bcl-2 proteins were positive in 25 (34.8%), 35 (50.0%) and 27 (37.5%), respectively. There were no statistically significant correlations between the p21 protein expression and the other clinicopathological variables. The expression of p53 protein, however, showed a significant relation to ER expression, and that of bcl-2 was positively correlated with tumor size. In survival analysis, p21, p53, and bcl-2 proteins, nuclear grade and lymph node status were associated with survival rate.
CONCLUSIONS
These results indicate that p21, p53, and bcl-2 proteins might play a role in tumorigenesis of breast carcinoma. In addition, the increased expression of p21, p53, and bcl-2 proteins could be used as factors suggesting poor prognosis in breast carcinomas.

Pathologic Findings in the Liver of Hepatitis B Virus X Transgenic Mice.: Hyung Bae Moon, Dae Yeul Yu, Byung Jun So, Haak Cheol Kim, Won Cheol Han, Ki Jung Yun, Hyung Nyoon Yoo; Korean J Pathol. 2003;37(5):342-350.

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Abstract PDF: BACKGROUND
The aim of this study was to investigate the hepatic pathology of HBx transgenic mice.
METHODS
The gross and histological examinations were done in 125 HBx transgenic mice and 34 non-transgenic littermates.
RESULTS
The incidence of a hepatic tumor was in-creased in the HBx transgenic mice older than 7 months and the overall incidence of a hepatic tumor was 62.2% (51/82) in the 13-18 months group of the HBx transgenic mice. The size of the hepatic tumor was 2.06+/-.92 mm in the 7-12 months group and 4.94+/-.05 mm in the 13-18 months group of HBx transgenic mice. All hepatic tumors were hepatocellular carcinomas and the histological patterns of hepatocellular carcinoma were either solid (84.2%, 48/57) or trabecular (15.8%, 9/57). Dysplastic changes in the hepatocytes were evident in 59.2% (74/125) of the HBx transgenic mice. There was lymphocyte infiltration, necrosis, fatty metamorphosis in both the dysplastic and tumor areas of the HBx transgenic mice. Vascular ectasia was identified in the tumor area of the HBx transgenic mice.
CONCLUSIONS
The pathological findings of the HBx transgenic mice were dysplastic changes in the hepatocytes and development of a hepatocellular carcinoma associated with lymphocyte infiltration, necrosis, fatty metamorphosis in the dysplastic area and tumor area of the HBx transgenic mice.

A Study on the Expression of Proliferating Cell Nuclear Antigen and Apoptosis of the Hepatocellular Carcinoma in Human and Hepatitis B Virus X Transgenic Mice.: Hyung Bae Moon, Dae Yeul Yu, Hyung Ryun Yoo, Byung Joon So, Kwon Mook Chae, Haak Cheol Kim, Ki Jung Yun, Won Cheol Han, Hyang Jeong Jo, Bo Yong Kim; Korean J Pathol. 2001;35(2):129-136.

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Abstract PDF: BACKGROUND
This experiment was designed to study the cell kinetics of hepatocellular carcinoma (HCC) in both hepatitis B virus X (HBx) transgenic mice and humans.
METHODS
The immunohistochemical stain of proliferating cell nuclear antigen (PCNA) and TdT-mediated dUTP-biotin nick end labeling (TUNEL) assay of apoptosis were used on formalin fixed-paraffin embedded tissues.
RESULTS
PCNA labeling indices (PCNA-LI) in the liver of HBx transgenic mice were markedly increased in HCC (11.3%) compare to the dysplastic areas (1.3%) and in the liver of non-transgenic littermates (0.1%). There was no significant difference of PCNA-LI in the dysplastic areas between HCC developed mice and non-HCC developed mice. Apoptosis labeling indices (Apoptosis-LI) in both the dysplastic areas and HCC of HBx transgenic mice were similar to those of non-transgenic littermates. PCNA-LI was markedly increased in human HCC (28.9%) compare to the background of HCC (2.9%) and the control liver (2.9%). Apoptosis-LI was decreased in human HCC (0.3%) compare to the background of HCC (0.4%) and the control liver (1.0%). Conclusion : There is a marked increase of cell proliferating activity in human HCC and in HCC of HBx transgenic mice, and there is a decrease of apoptosis in human HCC, but not in HCC of HBx transgenic mice.

Correlation between Expression of p53 and Bcl-2 Protein and Epstein-Barr Virus Detection in Gastric Adenocarcinoma.: Ki Jung Yun, Weon Cheol Han, Hyung Bae Moon, Sang Woo Juhng; Korean J Pathol. 1998;32(8):574-580.

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Abstract: Epstein-Barr virus (EBV) has been known to be associated with a wide variety of neoplastic conditions including nasopharyngeal carcinoma, Hodgkin's disease, and non-Hodgkin's lymphoma. Recent studies reveal the presence of EBV in certain subtypes of gastric carcinoma in which EBV appears to be pathogenetically related. To evaluate the relationship between EBV and gastric adenocarcinoma, we examined EBV DNA using direct in situ polymerase chain reaction, and expression of p53 protein and bcl-2 protein using immunohistochemical staining method on paraffin embedded tissues. The materials consisted of one hundred twenty-eight gastric adenocarcinomas and twenty benign peptic ulcers. EBV DNA was detected in 14 of 128 gastric adenocarcinomas (10.9%). p53 protein was positive in 10 of 14 EBV positive adenocarcinomas (71.4%) and in 61 of 114 EBV negative adenocarcinomas (53.5%). Bcl-2 protein was positive in 2 of 14 EBV positive adenocarcinomas (14.3%) and in 19 of 114 EBV negative adenocarcinomas (16.7%). The above results indicate that EBV is associated with gastric adenocarcinoma, and p53 protein may play a role in carcinogenesis of EBV in gastric adenocarcinoma.

Infantile Hemangioendothelioma of the Liver: Brief case report.: Hyang Jeong Jo, Ki Jung Yun, Jae Kyu Lee, Ji Shin Lee, Hyung Bae Moon; Korean J Pathol. 1997;31(6):586-588.

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Abstract PDF: Infantile hemangioendothelioma of the liver is a common vascular tumor in infancy. The tumor is usually multinodular or diffuse and classified into two types. We present a case of infantile hemangioendothelioma of the liver, which predominantly consists of type 2. A 4-month-old female was admitted for an evaulation of an abdominal distension. A CT scan of the liver showed a multinodular mass. The right lobectomy was done. Grossly, the mass consisted of round nodules ranging from 2cm to 5cm in diameter. Microscopically, the tumor revealed proliferation of small vascular channels lined by endothelial cells. Bizarre cells and mitotic cells were frequently noted. Vesicular nuclei and multilayering of the endothelial cells were also noted.

The Effect of Bacterial Lipopolysaccharide on the Lymphokine Production of the T Lymphocytes.: Hyung Bae Moon, Ki Jung Yun, Won Chul Han, Chae Woong Lim, Hyuk Nyun Kwon, Young Soon Park; Korean J Pathol. 1997;31(3):244-251.

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Abstract PDF: It is well known that the murine T helper cell clones are divided by their lymphokine secretory activities. One is the Th-1 cell, producing IL-2 and IFN after stimulation and the other is the Th-2 cell, producing the IL-4 and IL-5. This study was undertaken to evaluate the immunomodulatory properties of the bacterial lipopolysaccharide(LPS) on the lymphokine production in vivo and in vitro. The results were as follows: There were no effects on the lymphokine secretion by the in vitro treatment of the LPS. The in vivo treatment of the LPS decreases the capability of the production of IL-2 and IFN , whereas it increases the capability of IL-4 production. The altered capacity of the lymphokine production was recovered about 2 weeks after the treatment of the LPS. There were no differences on the lymphokine production between E-coli LPS and salmonella LPS. The capacity of the lymphokine production was the same in the treatment of a non-heated LPS or heated-LPS. The lymphokine production of the mice which were desensitized by the long term treatment of the LPS was not different from the control mice. The in vitro treatment of RU486 can block the alterations of the lymphokine production after the treatment of the LPS. In summary, one can tell that the LPS increases the secretion of the IL-4 through the endogenous secretion of the glucocorticoids.

Primary Malignant Melanoma arising in Mucosa of the Palatine Tonsil: A case report.: Ki Jung Yun, Hyang Jeong Jo, Hyung Bae Moon, Sang Won Yoon; Korean J Pathol. 1996;30(1):65-67.

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Abstract PDF: Maligant melanomas of the oral or nasal cavity, and the vulvovaginal area are relatively common among the melanomas of non-ocular mucosa. But, primary malignant melanoma arising in the mucosa of the palatine tonsil is rare. We present a case of primary malignant melanoma arising in the mucosa of the palatine tonsil. A 36-year-old male was admitted for evaluation of a recurrent sore throat. Tonsillectomy was performed on the basis of clinical suspicion of chronic tonsillitis. Grossly, the left tonsil was focally dark. Microscopically, the tonsillar mucosa was diffusely infiltrated with tumor cells. Tumor cells revealed numerous melanin pigments. Intraepithelial nests of tumor cells were noted, but pagetoid spread of tumor cells was not found. Tumor cells were positive for S-100 protein and HMB45 stain. There was no evidence of melanoma in the skin or eye.

The Prognostic Significance of p53 Protein and PCNA in Advanced Gastric Carcinoma.: Ho Won Hwang, Hyung Bae Moon; Korean J Pathol. 1995;29(4):450-458.

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Abstract PDF: The 5 year-survival rates were examined to evaluate the prognositic significance of the expression of the p53 protein and the positivity of the PCNA in 108 cases of advanced gastric carcinoma. The p53 protein and PCNA were stained by immunohistochemistry in the tissue of the gastrectomized specimen. The results were as follows. 1) The overall 5 year-survival rate of advanced gastric carcinoma was 42.3 % and the significant prognostic factors were a pathologic stage and p53 protein(p<0.005). 2) The expanding or infiltrating type by Ming's classification and the intestinal or difftise type by Lauren's classification had similar prognosis. 514_ @@l %R-t 3) The 5 year-survival rate of the p53-positive group was 25.1% and that of p53-negative group was 56.1%(p<0.005). 4) The 5 year-survival rate of the PCNA low-grade tumors by PCNA stain(<50%)was 48.7% and that of the high-grade tumor(>=50%)was 29.9%(p>0.1). 5) There was a tendency to have a good prognosis in the p53-negative group and low grade tumors in the stage 11, III, and IV. There was a significant difference between p53 protein positive and negative groups in the stage III(p<0.005), but no significant differences were found in the other groups. The above results indicate that the p53 protein is an another useful tool for prediction of the prognosis in advanced gastric carcinoma.

Diagnostic Significance of the CEA, AgNORs and PCNA in the Gastric Dysplasia and Adenocarcinoma.: Weon Cheol Han, Hyung Bae Moon; Korean J Pathol. 1995;29(1):61-67.

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Abstract PDF: This study aimed to differentiate gastric mucosal lesions such as the inflammatory gastric mucosa, gastric dysplasia and adenocarcinoma, using the CEA(carcinoembryonic antigen), AgNORS(Nucleolar organizer regions) and PCNA(proliferating cell nuclear antigen) stains. The tissue samples were taken from 30 cases of inflammatory gastric mucosa (19 gastritis and 11 regenerative hyperplasia), 28 cases of gastric dysplasia (9 mild dysplasia, 10 moderate dysplasia and 9 severe dysplasia) and 21 cases of gastric adenocarcinoma. The CEA was expressed in 16 of 21 adenocarcinomas(76%), but in neither inflammatory nor dysplastic gastric mucosae. The mean number of AgNORs per nucleus was 1.54 in inflammatory gastric mucosa, 1.80 in gastric dysplasia, and 1.88 in adenocarcinoma. The number of AgNORs was increased in dysplasia and adenocarcinoma compared to the inflammatory gastric mucosa without statistical significance. The percentage of the PCN A positive cells was 35.2% in inflammatory gastric mucosa, 44.1 % in gastric dysplasia, and 69.0% in gastric adenocarcinoma. The positivity of the PCNA was significantly increased in adenocarcinoma compared to the inflammatory gastric mucosa and dysplasia. In conclusion, the frequency of the CEA positive staining was increased in the gastric adenocarcinoma, and so CEA stain will be able to provide an additive method for the differential diagnosis between severe dysplasia and adenocarcinoma of the stomach.

Fine Needle Aspiration Cytology of Parapharyngeal Ganglioneuroma: A Case Report.: Ji Shin Lee, Hyang Jeong Cho, Ki Jung Yun, Hyung Bae Moon; Korean J Cytopathol. 1995;6(2):179-182.

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Abstract PDF: Ganglioneuromas are a fully differentiated tumor that contains no immature elements. The majority of ganglioneuromas are diagnosed in patients older than 10 years and are most often located in the posterior mediastinum, followed by the retroperitoneum. The location of these tumors in the parapharyngeal region is extremely uncommon and there are only a few reports on the cytologic appearance of the tumor. We report a case of ganglioneuroma presenting in a parapharyngeal location in a 4 year-old boy, diagnosed by fine needle aspiration cytology. The smears revealed scattered large oval to polygonal cells with voluminous, granular cytoplasms. The nuclei were one to two in number and had a prominent nucleolus. Clusters of benign spindie-shaped cells were also present.

Malignant Struma Ovarii: A case report.: Ki Jung Yun, Hyang Jeong Jo, Weon Cheol Han, Hyung Bae Moon; Korean J Pathol. 1994;28(4):436-438.

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Abstract PDF: Malignant struma ovarii is a rare tumor of the ovary. This can be diagnosed by histologically when carcinomas of the thyroid gland are excluded. We present a case of malignant struma ovarii arising from cystic teratoma. A 42-year-old female was admitted for evaluation of lower abdominal mass. Hysterectomy and both adnexectomy were performed on the basis of a clinical impression of uterine leiomyoma and an ovarian mass. The uterus revealed intramural leiomyoma, measuring 8 cm in diameter. Ovarian mass was predominantly cystic and partly solid. Microscopically, thyroid tissue with papillary structures were found in the solid area Papillae were complex, branching and randomly oriented. These papillae were infiltrated in the adjacent fibrous capsule, Clinical evidence of a primary thyroid carcinoma was not found.

Analysis of DNA Ploidy Patterns and Nuclear Morphometry in Diethylnitrosamine Induced Hepatocyte Nodules and Hepatocellular Carcinoma of Rats.: Chan Choi, Myung Kwan Kim, Kwan Mook Chae, Eun Cheol Kim, Hyung Bae Moon; Korean J Pathol. 1993;27(3):226-234.

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Abstract PDF: This study was designed to answer the question; (1) How does the DNA ploidy pattern change in hepatocarcinogenesis? (2) How does the nuclear morphology change in hepatocarcinogenesis? Diethylnitrosamine(DEN) (16.5 mg per kg) was subcutaneously injected to female Sprague-Dawley rats(150~200g) by weekly interval for 30 weeks. DNA ploidy and parameters of nuclear morphology were measured by image analyser(IBAS 200, Kontron, FRG). The DNA ploidy pattern was divided into three basic patterns(diploid, polyploid, and aneuploid modes). In 8 cases of saline-injected control rats, the DNA histograms showed all polyploid pattern. Inhepatocyte nodules(hyperplastic nodules), DNA diploidy was the most frequent pattern, being followed by polyploid and aneuploid DNA patterns, contrast to hepatocelular carcinomas in which polyploid DNA pattern was most frequently noted being followed by diploid and aneuploid DNA pattern. Although the nuclei of hepatocytes in hepatocyte nodules and hepatocellular carcinomas were larger and more pleomorphic than those of normal hepatocytes, they were as same as those of normal hepatocytes in regard to nuclear hyperchromasia. DNA content, which was increased in hepatocarcinogenesis, was significantly related to the nuclear area.

Multilocular Cystic Renal Cell Carcinoma: A case report.: Ki Jung Yun, Weon Cheol Han, Chan Choi, Hyung Bae Moon, Joung Sik Rim; Korean J Pathol. 1992;26(3):314-316.

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Abstract PDF: Multilocular cystic renal cell carcinoma appears to be a distinct and rare subtype of renal cell carcinoma with characteristic gross and microscopic features. Multilocular cystic renal cell carcinoma should be separated from multilocular cyst, multilocular cystic nephroma, and renal cell carcinoma with cystic degeneration. We present a case of multilocular cystic renal cell carcinoma. A 61-year-old man presented with right flank pain for 4 years. The computerized tomography revealed multilocular cystic mass in the upper pole of right kidney. The cystic mass measured 4.5x4 cm. The cyst was multilocular and locules not communicated with each other. The solid area was not present. Microscopically, the locules were lined by flat or cuboidal neoplastic clear cells. The clear cells were focally aggregated in the septa. The nephron was not present in the septa.

Comparative Study of the Breast Carcinoma by the Measurement of Nucleolar Organizer Regions and the Flow Cytometric DNA Analysis.: Ki Jung Yun, Weon Cheol Han, Chan Choi, Hyung Bae Moon; Korean J Pathol. 1992;26(2):117-124.

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Abstract PDF: It is important to predict the prognosis of patient with cancer. Well known parameters predicting the prognosis are staged and degree of differentiation. Recently, the prognostic and diagnostic significance of silver-stained nucleolar organizer regions(Ag-NORs) and flow cytometric DNA analysis are introduced. This study aims to detect the diagnostic significance of Ag-NORs in breast lesions, and to correlate the number of Ag-NORs and cellular ploidies in breast carcinoma. In addition, the existence of heterogeneity according to the sample in the same patient is studied Sixty six paraffin blocks(two primary lesions and the two metastatic lymph nodes in 13 patients, and one primary lesion and one metastatic lymph node I 10 patients) of breast carcinoma, 30 paraffin blocks of fibroadenoma and 23 paraffin blocks of normal breast are studied. The numbe of Ag-NORs increase from normal breast(mean 1.45) through fibroadenoma(mean 1.60) to carcinoma(mean 2.43). It was significantly different between each lsions(P<0.0005). The number of Ag-NORs increased in the aneuploidy carcinoma than that in the euploidy one(P<0.05). But, there was difference between the number of Ag-NORs and DNA index according to the sample area in the same patient with carcinoma. In conclusion, the number of Ag-NORs is diagnostically significant in breast lesions and is correlated with cellular ploidies in breast carcinoma. In addition, Ag-NORs and cellular ploidies are heterogenous in the same patient.

DNA Ploidy and S-Phase Fraction in Proliferative Hepatic Lesions of Rat Liver Induced by Dietylnitrosamine and Partial Hepatectomy.: Chan Choi, Sung Hee Cho, Hyung Bae Moon, Ki Jung Yun, Hun Taeg Chung, Sang Woo Juhng; Korean J Pathol. 1991;25(4):346-356.

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Abstract PDF: We have investigated the changes of DNA ploidy and S-phase fraction in proliferative lesions of rat liver. Proliferative lesions were induced by diethylnitrosamine and partial hepatectomy. DNA ploidy was measured by flow cytometer, and S-phase fraction was measured by in situ bromodeoxyuridine(BRdU)-anti BRdU monoclonal antibody techniques. Normal liver and initiated lesion revealed DNA diploidy or DNA tetraploidy. Hepatocyte nodule (NODULE) and hepatocelular carcinoma (HCC) revealed DNA diploidy, tetraploidy or aneuploidy. S-phase fraction was 1.0+/-0.9, 1.0+/-0.9m 3.7+/-2.3, 5.5+/-4.9, and 13.8+/-11.6 in normal liver, initiated lesion, NODULE not associated with HCC, NODULE associated with HCC, and HCC, respectively. In NODULE associated with HCC, it was widely distributed, ranging from 0.8 to 15.5%. In conclusion, S-phase fraction appeared to be increased as the hepatocarcinogenesis proceeded, but DNA ploidy did not. There was a heterogeneity of DNA ploidy and S-phase fraction in the proliferative hepatic lesions.

Aggressive Osteoblastoma.: Yong Koo Park, Hyung Bae Moon, Dong Kyuen Lee, Dae Moo Shim, Jung Dal Lee; Korean J Pathol. 1986;20(2):235-239.

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Abstract: Osteoblastomas were originally thought to be lesions that could be controlled with minimal local therapy, including curettage. However, at least some of the osteoblastomas with an unexpectedly active clinical course had histologic features which differed from ordinary osteoblastomas, and the term aggressive osteoblastoma was given to these lesions. In the aggressive osteoblastoma the osteoblasts are cytologically atypical. In addition, the well organized trabecular patterns of typical osteoblastoma is partly lacking, especially in the areas that are rich in atypical osteoblasts. The case report deals a case of aggressive osteoblastoma of the left iliac wing in a 44 year old male. The interesting radiologic manifestationa(plain x-ray CAT and radionuclide bone scan) and characteristic histologic findings are presented along with review of pertinent literatures.

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