• Journal of the Korean Society of Food Science and Nutrition
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• v.26 no.6
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• pp.998-1005
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• 1997

Kimchi showed protective effect from oxidative damage generated by hydrogen peroxide and paraquat. To investigate the major components of kimchi which reduce the cytotoxicity against reactive oxygen species, keratinocyte(A431, epidermoid carcinoma, human) and fibroblast(CCD-986SK, normal control, human) were cultured under oxidative stress condition provoked by paraquat, a superoxide anion generator, and hydrogen peroxide in the absence or presence of kimchi ingredients. Most keratinocyte and fibroblast cells were killed by hydrogen peroxide and paraquat over 1mM concentration, but kimchi ingredients showed protective effects from oxidative damage generated by hydrogen peroxide and onion, among those, garlic showed the most remarkable preventive effect. Most of kimchi ingredients showed protective effect against paraquat, especially leek notably increased cell survival. For fibroblast cells, ginger had the preventive effect against paraquat, especially leek notably increased cell survival. For fibroblast cells, ginger had the preventive effect from cell killing by high dose of hydrogen peroxide, but most ingredients were not effective against paraquat.

• Korean Journal of Pharmacognosy
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• v.53 no.4
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• pp.181-191
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• 2022

As the incidence of skin cancer increases every year, non-surgical treatment methods for cancer are being sought. Esculetin, a natural dihydroxy coumarin, is attracting attention as a therapeutic agent for certain diseases, such as cancer, based on its broad pharmacological activity. In this study, the anticancer ability of esculetin was evaluated using the epidermoid carcinoma cell line A431. As a result of evaluating the apoptosis ability of esculetin by MTT assay, apoptosis was observed in a time-concentration-dependent manner regardless of the presence or absence of FBS. As a result of quantitative real-time PCR, esculetin reduced cyclin D1 mRNA in a time-concentration-dependent manner. In addition, as a result of western blotting, esculetin significantly inhibited phosphorylation of ERK, JNK, and p38 in a concentration-dependent manner. The results of this study suggest that esculetin has the potential to be used as an effective natural medicine for the treatment of skin cancer.

• Korean Journal of Head & Neck Oncology
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• v.2 no.1
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• pp.23-31
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• 1986

During the past 14years 267 patients presented with a lump in the neck proven to be metastatic cancer histologically. In most cases the primary site was discovered by thorough physical examination, E.U.A.(examination under anesthesia) and radiodiagnostic studies. However in 31 cases complete diagnostic evaluation failed to reveal the primary site. This paper discusses the characteristics of this group of patients in terms of the frequency of the ultimately discovered primary sites, policies for diagnosis, methods of management, and the ultimate prognosis for such cases in Korea. The male: female ratio was 6.8:1 and 84 % of all cases occurred in the $51{\sim)70$ age group. The majority of these cancers were epidermoid carcinomas(67.7%) and 22 of the 31(71 %) were Stage IV lesinos(17 N3A lesions and 5 N3B lesions). Surgical management was employed in 7 cases only, and in 5 cases this was combined with rediotherapy, chemotherapy, or both. Nevertheless, the only patients who survived disease-free for two years or more (one for over 5 years) were two patients in this management group. None of the patients treated by radiotherapy or chemotherapy of a combination of these two modalities survived. Occult primary sites were eventually discovered in 5 of the 31 cases, two in the nasopharynx, and one each in the base of tongue, pyrifrom sinus, middle ear. Of the 21 cases with epidermoid carcinoma which presented in the neck, 2 are free of disease for 3years or more. Of those who underwent radical surgery two of five survived. This study thus confirms the principle enunciated by MacComb in 1972 that surgical treatment in the form of radical neck dissection is the cornerstone of management whenever feasible.

• International Journal of Oral Biology
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• v.45 no.4
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• pp.169-178
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• 2020

L-ascorbic acid (L-AA; vitamin C) induces apoptosis in cancer cells. This study aimed to elucidate the molecular mechanisms of L-AA-induced apoptosis in human laryngeal epidermoid carcinoma Hep-2 cells. L-AA suppressed the viability of Hep-2 cells and induced apoptosis, as shown by the cleavage and condensation of nuclear chromatin and increased number of Annexin V-positive cells. L-AA decreased Bcl-2 protein expression but upregulated Bax protein levels. In addition, cytochrome c release from the mitochondria into the cytosol and activation of caspase-9, -8, and -3 were enhanced by L-AA treatment. Furthermore, apoptosis-inducing factor (AIF) and endonuclease G (EndoG) were translocated into the nucleus during apoptosis of L-AA-treated Hep-2 cells. L-AA effectively inhibited the constitutive nuclear factor-κB (NF-κB) activation and attenuated the nuclear expression of the p65 subunit of NF-κB. Interestingly, L-AA treatment of Hep-2 cells markedly activated Akt and mitogen-activated protein kinase (MAPK; extracellular signal-regulated kinase 1/2, p38, and c-Jun N-terminal kinase [JNK]) and and LY294002 (Akt inhibitor), SB203580 (p38 inhibitor) or SP600125 (a JNK inhibitor) decreased the levels of Annexin V-positive cells. These results suggested that L-AA induces the apoptosis of Hep-2 cells via the nuclear translocation of AIF and EndoG by modulating the Bcl-2 family and MAPK/Akt signaling pathways.

• Journal of Chest Surgery
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• v.11 no.2
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• pp.129-134
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• 1978

Two hundred and seventeen patients underwent diagnostic rigid bronchoscopy or bionchofiberscopy to evaluate the cytologic diagnosis in the lung cancer patient at the department of chest surgery of Yon-Sei university, college of the medicine from 1971 to 1977 year. One hundred and twenty cases of these patients were taken rigid bronchoscopy and ninety four cases of these patient were taken bronchofiberscopy. Cytologic examination of the sputum was done in 214 cases and sputum cytology was positive in 50 cases [23.4%]. Rigid bronchoscopy was made in 120 cases and this bronchoscopic cytology including bronchial washing and bronchial biopsy was positive in 34 cases [28.5%]. Bronchofiberscopy was performed in 94 cases and was positive in 45 cases [47.5%]. Histopathologically, 41 cases [43.6%] were epidermoid cell carcinoma, 8 cases [8.5%]of undifferentiated cell type, 12 cases [12.8%]of adenocarcinoma, 8 cases [8.5%]of alveolar cell type, and the 25 cases were undetermined. Cytologic examination of the sputum lacks the accuracy of the bronchoscopies in terms of both localization and accurate histologic indentification of the type of neoplasm. Rigid bronchoscope has the advantage of permitting identification of a tumor in a central location and of providing a sufficient amount of biopsy material for accurate diagnosis of carcinoma. However, it has the disadvantage of limiting examination to the larger, more central portions of the tracheobronchial tree. Bronchofiberscope had the advantage of examine upper lobe as well as other portions of the tracheobronchial tree which could not be visualized with the rigid bronchoscopy. A positive diagnosis in bronchofiberscopy was obtained in the highest rate, 47. 8% [45 cases]. A1 last, if a bronchogenic carcinoma is suspected on the basis of either symptoms of an abnormality on the chest film the diagnostic work-up-sputum cytology, bronchial washing, bronchoscopic biopsy, scalene node biopsy, thoracentesis and mediastinoscopy explothoracotomy etc-should precede in an attempt not only to obtain the higher positive diagnosis but also to obtain a tissue diagnosis and to evaluate the stage of the disease and to ascertain the appropriate mode of therapy.

• Korean Journal of Head & Neck Oncology
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• v.3 no.1
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• pp.25-35
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• 1987

Irradiated 88 patients of Maxillary Sinus Carcinoma at Yonsei Cancer Center for 10years between 1971 and 1980 were retrospectively analysed. The majority of patients had very advanced disease(87.5% of $T_3\;and\;T_4$) and 17% of cervical lymph node involvement. 80.6% of all patients were epidermoid type. In 44 cases(50%), irradiation alone was performed. 28 cases(32%) of postoperative radiation after incomplete surgery and the remaining 16 cases(18%) of postoperative radiation after radical surgery were done. The majority of patients except 6 cases had irradiation a dose between 60Gy and 80Gy in 30-40 fractions over 6-8 weeks. The actuarial overall 3 and 5 year survival rate were 362% and 26%, respectively. The actuarial 5 year survival rate for 44 cases of radiation alone group was 14.1%, The actuarial 5 year survival rate for 28 cases of incomplete surgery and postoperative radiation group and 16 cases of radical surgery and postoperative radiation group were 312% and 67.4% respectively. In the actuarial 5 year survival rate according to the stage, stage II, III and IV were 79.5%, 20.9% and 0%. In recent, for the improvement of survival rate of advanced Maxillary Sinus Carcinoma at Yonsei Cancer Center, combined multidisplinary or trimodal treatment modality have been applied and in near time the more excellent results expect to be analyse.

• Journal of Life Science
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• v.21 no.3
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• pp.349-357
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• 2011

Inhibitors of EGFR (epidermal growth factor receptor) kinase activity may prove useful to therapeutically intervene in cancer and to treat other proliferative diseases. In this study, we investigated the inhibitive effects of two compounds named 63013 and 63033 possess a [1,4]-dioxino quinazoline structure that links the alkoxy side chains together and their structural characteristics are considered to allow better solubility than the dialkoxyquinazoline derivatives. The EGFR kinase activities of A431 human epidermoid carcinoma cells, stimulated by EGF were inhibited by treatment with 63013 and 63033 in a dose-dependent manner respectively. Consistent with the compound-mediated EGFR kinase suppression, the major EGF-related downstream target molecules, such as MEK1/2, MAPK p44/42, AKT and STAT3, were also suppressed by both compounds. Interestingly, both compounds led to cell growth inhibition at a lower concentration than that of Gefitinib (Iressa$^{(R)}$). Collectively, our study showed that both compounds may have good therapeutic potential as an EGFR kinase specific inhibitor to treat EGFR-related diseases.

• Radiation Oncology Journal
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• v.3 no.1
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• pp.41-50
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• 1985

63 patients who were irradiated with a goal of long term control among 101 patients with esophageal cancer seen during an 11 fears period between Jan, 1970 and Dec, 1980 at Yonsei Cancer Center in Seoul, Korea have retrospectively analysed. 52(82.5%) among the 63 Patients were confirmed to have epidermoid carcinoma in the histology. 46 cases(73.0%) except 17 cases of $T_1$, were locally or far advanced extension. Tumor dose of radical radiation in the management of esophageal cancer had delivered from 50 Gy to 74 Gys. 2 Gys daily fractions, between 5weeks and 8 weeks. After 1 month from the completion of radiation, 23 of the 63 patients had a repeat barium esophagogram for the assessment of tumor response, there had showed 7 cases of complete response and 15 cases of partial response. 45(71.4%) patients were followed up and the remaining 18 patients were lost to follow-up within 1 year after the completion of irradiation. Actuarial overall 3 and 5 years survival rate of all 63 Patients were 11.8% and 8.8%, respectively. The actuarial 3 and 5 years survival rates of 17 cases of $T_1$, esophageal cancer were 24.7% and 20.8%. Statistically, there was no significant difference in survival rate according to tumor location (p>0.05). Radical Radiotherapy, Esophageal Cancer

• Journal of the Korean Society of Laryngology, Phoniatrics and Logopedics
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• v.4 no.1
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• pp.33-41
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• 1991

The clinical entity referred to as epithelial hyperplasia has been called by various terms : keratosis, hyperkeratosis, pachydermia, acanthosis, leukoplakia, hyperkeratotic laryngitis. The metaplasia and keratinization of the layngeal mucosa are associated with the subsequent appearance of invasive epidermoid carcinoma. Therefore. frequent and prolonged periods of observation and histologic study on keratosis of the larynx are essential. A retrospective review of 18 patients with laryngeal hyperkeratosis seen at Department of Otolaryngology Yondong Severance Hospital during the 7 years period was completed. The results are summarized as follows : 1) The incidence was much higher in males(22 patients) than in females(4 patients) 2) The peak age of male was 4th decades and the peak age of female was 4th. 5th decades. 3) The chief complaint of the patients was hoarseness in all cases. 4) The average duration of symptoms was less than 24 months for 19 cases(73.1%). 5) 17 patients(65.4%) was smokers and duration of smoking was 10~20 years for 10 cases(38.8%). 6) On histological examination. the lesions were classified into three types: simple hyperplasia(61.5%). dysplasia(26.9%) and carcinoma in situ(2 cases). 7) The recurrence rates was 9 cases(34.6%) and transformation rate into invasive carcinoma was 1 case(3.8%).

• Korean Journal of Medicinal Crop Science
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• v.20 no.3
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• pp.153-158
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• 2012

In order to develop as a natural source of anticancer materials of Cudrania tricuspidata, the cytotoxicity of methanol extracts by harvesting parts and times against 8 cell lines including 293 (normal kidney cells) and A-431 (epidermoid carcinoma cells) were investigated using MTT assay. All harvesting parts had hardly cytotoxicity against 293. And methanol extracts of stem bark and root bark showed very high cytotoxicities against 7 cancer cell lines. The cytotoxicity was the highest against HeLa (cervix adenocarcinoma cells) and followed by MCF-7 (breast adenocarcinoma cells), AGS (stomach adenocarcinoma cells), HT-29 (colon adenocarcinoma cells), HepG2 (hepatoblastoma cells), A549 (lung carcinoma cells) and A-431. By the way, leaf extract had a cytotoxicity against only AGS and ripe fruit extract had no cytotoxicity. Among harvesting times, the cytotoxicity of root bark were high from April to September but that of stem bark showed a little difference. These results showed that anticancer activities of Cudrania tricuspidata extracts were eventful changes by harvesting parts and times.