• 대한두경부종양학회지
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• 제15권2호
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• pp.156-161
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• 1999

Objectives: The epidermal growth factor receptor(EGFR) family has been increasingly recognized as an important component in the control of normal cell proliferation and the pathogenesis of cancer. To confirm the usefulness of epidermal growth factor receptor as a tumor marker, we initiated this study. Materials and Methods: EGFR was measured by immunohistochemical staining using EGFR antibody. It was performed on section from paraffin blocks of 65 thyroid tissue including 33 paillary carcinoma, 11 follicular carcinoma, 11 nodular hyperplasia, 5 follicular adenoma and 5 normal thyroid tissue. We evaluated morphologic characteristic of various thyroid neoplasms, and the relationship between EGFR and other prognostic factors in papillary thyroid carcinomas. Results: The expression of EGFR was commonly found in neoplasms of thyroid, with trend for stronger staining in the more malignant tumor(p=0.000). Also the expression of EGFR in papillary thyroid cancer related to tumor characters including tumor size(p=0.042), extent(p=0.024) and prognostic features including AMES scores(p=0.019). The strong EGFR staining in papillary carcinoma was significantly associated with tumor recurrence(p=0.003). Conclusions: EGFR may have a role in the regulation of normal and neoplastic thyroid cell growth. EGFR status may help predict the clinical course of patients with malignant thyroid neoplasms. However, the study of more cases will be needed for significance of the information about the EGFR as an independent prognostic factor.

• 대한미생물학회지
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• 제19권1호
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• pp.85-108
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• 1984

In order to study the relationship between resistance of tumor cells to anticancer drugs and immunologic cytotoxicity and their chromosome number, a line of cancer cells (NS-1) was exposed to BCNU and CCNU in vitro. Characteristics of the distribution of chromosome number of the survived cells were then comparatively analyzed. Effect of immune mediated cytotoxicity, i.e. complement and cell-mediated cytotoxicity, on the ploidy characteristics was observed in the same way. NS-1 cells were found to be a population of neoplastic cells of heterogeneity having 5 to 115 chromosomes per cell in metaphase. The majority of the cells were belong to the class of chromosome number 56 to 60 which were considered as the stem cell line. Dramatic changes in the distribution of chromosome number following drug treatment were not observed. However the range of chromosome distribution was slightly changed. Characteristics of chromosomal distribution of drug treated cells were not significantly varied by different doses of drug treated. Changed chromosomal distribution patterns of drug treated cells were reversible, especially the cells having 56 to 60 chromosomes recovered rapidly. Cells having 41-60 and 61-80 chromosomes among cells treated with BCNU and cells with 41-60 chromosomes after CCNU treatment were the major population which regenerated continuously. Following BCNU treatment cells having 61-80 chromosomes were not varied much whereas CCNU treatment affects the population in the same class. Chromosomal aberrations were significantly enhanced by BCNU and CCNU treatment. The frequency of chromosomal aberrations was greater in cells having more than 40 chromosomes compared with that in cells having less than 40 chromosomes. Changes in ploidy characteristics of the cells following complement mediated and cell mediated cytotoxicity were not significant. Therefore it was tentatively concluded that association of numerical distribution pattern of NS-1 cells with the response to the treatment used in this experiment was not recognized.

• 대한후두음성언어의학회지
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• 제22권1호
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• pp.56-59
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• 2011

Inflammatory pseudotumor is characterized by the presence of a mass that may mimic malignancy and is composed of spindle cells mixed with variable amounts of extracellular collagen, lymphocytes, and plasma cells It is benign tumor commonly involves lung and orbit and rarely that occurs in the head and neck The cause and pathogenesis of inflammatory pseudotumor still remain controversial. Some bacterial infection or chronic irritation may have prompted some speculation that an initially reactive process can change into an overt neoplastic disease. It tends to affect children and young adults than old ages. We present a case of inflammatory pseudotumor involving the tongue base, in a 73-year-old patient with repeated oral bleeding that aggravated over a few days. Clinical examination showed angiomatous polyp like findings in oropharynx that easy bleeding tendency. CT images showed well defined soft tissue mass with focal enhancement. After surgery, tumor was finally diagnosed inflammatory pseudotumor by histopathologic examinations showed plasma cells and inflammatory cells in variable fibrotic tissues.

• 한국식품과학회지
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• 제27권6호
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• pp.972-977
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• 1995

Quinone reductase(QR)를 포함한 2상효소계를 활성화시키는 성분들은 많은 동물실험에서 발암물질의 세포내 작용을 억제함으로서 항종양효과를 나타내는 것으로 보고되어 있다. 본 연구에서는 대표적인 농산부산물로서 미강, 밀기울, 탈지대두박, 두유박, 참깨박, 들깨박등 6종의 시료에 대한 암예방효과를 갖는 물질의 존재여부를 탐색하기 위하여, mouse hepatoma cell line(Hepalclc7 cells) 을 이용하여, quinone reductase활성유도 여부를 측정하였다. 참깨박과 들깨박의 80%메탄올 추출물은 0.5mg/ml 농도에서 강력한 QR 유도활성을 나타냈으며, 같은 농도에서 다른 시료들은 거의 QR 효소활성을 증가시키지 않았다. 한편 QR효소활성을 유도하는 성분을 찾아내기 위하여 일차적으로 TLC를 수행한 결과, 참깨박과 들깨박의 메탄올 추출물 가운데 사용한 전개용매(n-butanol : n-propanol : 2N ammonium hydroxide(10 : 60 : 30)에서 가장 빨리 이동하는 분획(Rf=0.70)이 유효성분을 함유하고 있음을 확인하였으며, 현재 활성성분의 동정이 진행중에 있다.

• Journal of the Korean Association of Oral and Maxillofacial Surgeons
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• 제30권3호
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• pp.218-222
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• 2004

치성유령세포암종은 석회화치성낭종의 악성 부분으로 치성낭종, 치성종양 모두에서 기인할 수 있다. 다형성 상피 세포와 유령세포가 nucleated cell들과 혼재된 침윤성 종양의 형태로 나타나는 것이 특징이고, 국소 재발 및 원격 전이된 증례도 보고된 바있다. 저자들은 드문 치성종양인 치성유령세포암종을 상악골에서 경험하였기에 문헌 고찰과 함께 보고하였으며, 본 증례의 경우 향후 재발 및 전이 여부 파악을 위해 주기적인 경과 관찰이 필요하리라 사료된다. 또한 악성 변화의 요인으로 이종골 이식의 영향에 대한 연구도 필요하리라 사료된다.

• Journal of the Korean Association of Oral and Maxillofacial Surgeons
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• 제37권2호
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• pp.97-108
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• 2011

Cancer stem cells have stem cell-like features, such as the ability for self-renewal and differentiation but show unlimited growth because they have the lost normal regulation of cell growth. Cancer stem cells and normal stem cells have similar features. They show high motility, diversity of progeny, robust proliferative potential, association with blood vessels, immature expression profiles, nestin expression, epidermal growth factor (EGF)-receptor expression, phosphatase and tensin homolog (PTEN) expression, hedgehog pathway activity, telomerase activity, and Wnt pathway activity. On the other hand, with cancer cells, some of these signaling pathways are abnormally modified. In 1875, Cohnheim suggested the concept of cancer stem cells. Recently, evidence for the existence of cancer stem cells was identified. In 1994, the cancer stem cells' specific cell surface marker for leukemia was identified. Since then, other specific cell surface markers for cancer stem cells in solid tumors (e.g. breast and colon cancer) have been identified. In oral cancer, studies on cancer stem cells have been performed mainly with squamous cell carcinomas. Oral cancer specific cell surface markers, which are genes strongly expressed in oral cancer and cancer stem cell specific side populations, have been identified. Cancer stem cells are resistant to radiotherapy and chemotherapy. Therefore, to eliminate malignant tumors efficiently and reduce the recurrence rate, therapy targeting cancer stem cells needs to be performed. Currently, studies targeting the cancer stem cells' specific signaling pathways, telomerase and tumor vasculatures are being done.

• 대한기관식도과학회지
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• 제17권1호
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• pp.5-8
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• 2011

The proliferation of new technologies has significantly enhanced the diagnostic capabilities of flexible bronchoscopy compared with traditional methods. Narrow band imaging (NBI), an optical technique in which filtered light enhances superficial neoplasms based on their neoangiogenic patterns, was developed to screen for central intraepithelial moderate or severe dysplasia, carcinoma in situ (CIS), and microinvasive neoplasia in patients at risk for lung cancer. Because angiogenesis occurs preferentially in dysplastic and neoplastic lesions, NBI may identify early dysplastic lesions better than white light bronchoscopy (WLB) currently in use. NBI bronchoscopy can be used not only to detect precancerous lesions, but also to screen for cancerous lesions. We prospectively evaluated 101 patients with suspected lung cancer between July 2009 and June 2010. All were previously scheduled for flexible bronchoscopy CT scans. Abnormal NBI was defined by Shibuya's descriptors (tortuous, dotted, or spiral and screw patterns). Biopsies of 132 lesions in 92 patients showed that 78 lesions (59.1%) were malignant and 54 (40.9%) were benign. The diagnostic sensitivity of bronchoscopy in detecting malignancy was 96.2% (75/78). When assorted by lesion pattern, the sensitivity and specificity of NBI bronchoscopy in detecting malignancies were 69.2% (54/78) and 96.3% (52/54), respectively, for the spiral and screw pattern and 14.1% (11/78) and 96.3% (52/54), respectively, for the dotted pattern. Unexpectedly, additional cancerous lesions were detected in five patients (2 dotted and 3 spiral and screw). As a screening tool for malignant lesions, NBI bronchoscopy should assess combinations of all three lesion. The dotted and spiral and screw patterns may be helpful in determining which lesions should be biopsied. NBI bronchoscopy may be useful not only for the diagnosis of early-stage lung cancer but also for more accurate local staging of lung cancer.

• 한국임상수의학회지
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• 제27권1호
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• pp.97-101
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• 2010

A 13-year-old neutered female Maltese was referred to Veterinary Medical Teaching Hospital of Seoul National University with 8-month-history of gradually enlarging retrobulbar mass in the right eye. On the ophthalmic examinations, exophthalmos, exposure keratitis, and cataract were observed, and menace response was absent in the eye. The fellow eye was normal except for nuclear sclerosis. On the ocular ultrasonographic evaluation, a mass was identified in retrobulbar and periocular region in the right eye. Exenteration was performed in order to remove the mass. Histopathologic evaluation revealed that most part of the mass was composed of epithelial-like neoplastic cells. Invasion into adipose cells and osseous metaplasia around the mass were also confirmed. Based on the radiologic and histopathologic examination, the mass in the right eye was diagnosed as primary retrobulbar meningioma. Eleven months after the surgery, recurrence was not observed.

• 한국임상수의학회지
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• 제31권5호
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• pp.439-444
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• 2014

체중 2.7 kg의 5세령 암컷 말티즈 견이 양측 슬개골 탈구와 후지 파행으로 지역동물병원에 내원하였다. 도르레절제술과 슬개골의 외측 보강 봉합법을 이용하여 슬개골 탈구 정복술을 실시하였으나, 수술 3주 후 등을 굽힌 자세의 보행과 후지의 운동실조, 흉요추부의 압통, 간헐적인 경련증상으로 재 내원하였다. 자기공명영상 촬영 결과, 우측 전두엽의 종괴와 경수에서부터 3번 요수까지의 공동성 변화가 확인되었다. 병리조직학적 소견으로 뇌종양은 느슨한 망상구조 또는 레이스 모양의 수막세포들로 구성되었으며, 세포 외부에 다양한 크기와 형태의 많은 낭포성 공간이 관찰되었다. 면역조직화학염색 결과 종양세포들은 vimentin 양성, 신경원 특이 에놀라제 및 신경교 섬유질 산성 단백질에는 음성을 나타내었다. 경수와 흉수 부위에는 부정형의 확장된 중심관 유사 동공이 관찰되었다. 이 증례는 개에서 특이적인 두개강 내 소낭성 뇌수막종과 연관되어 2차적으로 발생한 척수공동증의 임상소견과 영상학적 및 병리조직학적 특징을 보여주고 있다.

• 한국자원식물학회:학술대회논문집
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• 한국자원식물학회 2000년도 The 7th International Symposium
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• pp.64-65
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• 2000

Cancer is a general term subjected to a series of malignant tumor diseases which may affect many different parts of the human body. These cancer diseases are characterized by a rapid and uncontrolled formation of abnormal cells in the body. Cancer chemotherapeutic agents can often provide the prolongation of life and occasionally cures. To date many kinds of compounds have been obtained from plants kingdom as anti-neoplastic and anti-cancerous agents. However, there is no special type of compounds for cancer therapy. In our laboratory, anti-tumor and cytotoxic screenings on higher plants collected in Japan, China, Korea, Southeast Asia and South America have been done by using Sarcoma 180 ascites in mice, P388 lymphocytic leukemia in mice, Chinese hamster lung V-79 cells, P388 cells and nasopharynx carcinoma (KB) cells. The family, Simaroubaceae consists of about 20 genera and 120 species, mainly shrubs and trees, distributed in tropical and subtropical country. Simaroubaceae is classified as RUTALES, together with Rutaceae, Burseraceae, Meliaceae, Malpighiaceae and Polygalaceae. The members differ from the Rutaceae in not containing oil glands. Bitter principles are a characteristic of the family, Simaroubaceae. The genera include Quassia (Simarouba) (40 spp.), Picrasma (Aeschrion) (6 spp.), Brucea (10 spp.), Soulamea (10 spp.), Ailanthus (10 spp.) and Perriera (1 spp.) etc.. Surinam quassia derived from Quassia amara growing in Guianas, north Brazil and Venezuela is used in traditional medicines for stomachic, anti-amoebic, anti-malarial and anti-anaemic properties. Also, various parts of a number of plants of the family Simaroubaceae have been used in traditional medicine for the treatment of a variety oi diseases including cancer, amoebic, dysentery and malaria. Then, the research has established that it is the quassinoid content of these plants that is responsible for above activities. In this meeting, I will present on anti-tumor and anti-malarial activities and their active principles of Simaroubaceae plants, Eurycoma longifolia, Ailanthus vilmoriniana, Simaba cedron and Brucea mullis which have been studied in our laboratory.