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JYMS : Journal of Yeungnam Medical Science

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Chang Hoon Bai 6 Articles
Injury of the Medial Rectus Muscle by Using a Microdebrider During Endoscopic Sinus Surgery : A Case Report.
Yoon Seok Choi, Chang Hoon Bai, Si Youn Song, Yong Dae Kim
Yeungnam Univ J Med. 2006;23(2):240-246.   Published online December 31, 2006
DOI: https://doi.org/10.12701/yujm.2006.23.2.240
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AbstractAbstract PDF
A microdebrider is increasingly used in endoscopic sinus surgery. Although it has many advantages over conventional instruments, it has been associated with severe complications. We treated a case of rupture of the left medial rectus muscle after use of a microdebrider during endoscopic sinus surgery in a 50 year-old female patient who complained of binocular diplopia and exotropia. The patient showed marked limitation on adduction and about 40 prism diopters of left exodeviation. The orbital computed tomography showed a bony defect at the left medial orbital wall, and injury of the medial rectus muscle. The exodeviation was corrected after ophthalmologic surgery. We report a case of the rupture of the medial rectus muscle after use of a microdebrider during endoscopic sinus surgery and review the medical literature.
Docetaxel and Cisplatin Combination Chemotherapy in Patients with Advanced Head and Neck Cancer.
Sung Won Choi, Young Ho Choi, Chang Hoon Bai, Yong Dae Kim, Si Youn Song
Yeungnam Univ J Med. 2006;23(2):162-170.   Published online December 31, 2006
DOI: https://doi.org/10.12701/yujm.2006.23.2.162
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AbstractAbstract PDF
BACKGROUND
Head and neck cancer is curable at early stages with local-regional therapy. However, most patients are diagnosed with advanced stage disease that requires combination therapy. The aim of this study was to determine the efficacy of docetaxel and cisplatin combination chemotherapy, in patients with advanced head and neck cancer by evaluating the response, survival and organ preservation rates. MATERIALS AND METHODS: We reviewed retrospectively the medical records of 39 patients with advanced head and neck cancer who received docetaxel and cisplatin combination chemotherapy from March 2000 to July 2004. RESULTS: The average age of the 39 patients was 53.4 (range 30 to 73 years) years and the most common primary site was the hypopharynx (23.0%). There were 36 patients who had stage IV disease and three patients with stage III disease. The overall response rate was 76.9% (30/39), including 12 complete responses (30.8%) and 18 partial responses (46.1%). The response rate based on the primary cancer and neck metastasis was 74.4% and 69.3%; the differences were not significant. Among 16 patients with laryngeal and hypopharyngeal cancer, 13 (81.2%) had their larynx preserved after chemotherapy followed by radiotherapy and a survival rate of 61.5%; three patients (18.8%) received a total laryngectomy and had a survival rate of 66.7%. The overall survival rate from the start of chemotherapy was 56.4% with a median survival of 30 months. The common toxicities observed were alopecia, vomiting, diarrhea, hepatotoxicity and anemia but they were all generally manageable. CONCLUSION: Docetaxel and cisplatin combination chemotherapy is an effective regimen with a relatively high response rate and acceptable toxicity
Evaluation of Computed Tomography and Magnetic Resonance Imaging of Sinonasal Inverted Papilloma.
Chang Hoon Bai, Young Jung Seo, Seok Choon Lee, Seung Min Chen, Un Hoi Baek, Eun Chae Jung, Si Youn Song, Yong Dae Kim
Yeungnam Univ J Med. 2005;22(2):191-198.   Published online December 31, 2005
DOI: https://doi.org/10.12701/yujm.2005.22.2.191
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AbstractAbstract PDF
BACKGROUND
Computed tomography (CT) is commonly used to evaluate the degree of sinus involvement in cases of inverted papilloma (IP). However, CT cannot differentiate tumor from adjacent inflammatory mucosa or retained secretions. By contrast, magnetic resonance imaging (MRI) has been reported to be useful in distinguishing IP from paranasal sinusitis. This study investigated whether preoperative assessment with MRI and CT accurately predict the extent of IP. MATERIALS AND METHODS: CT and MRI were retrospectively reviewed in 9 cases of IP. Patients were categorized into stages based on CT and MRI findings, according to the staging system proposed by Krouse. The involvement of IP in each sinus was also assessed. RESULTS: Differentiation of IP from inflammatory disease may be more successful in routine cases where the inflammatory mucosa has low signal intensity on T1-weighted images and very high signal intensity on T2-weighted images. CT imaging could not differentiate tumor from adjacent inflammatory mucosa or retained secretions. CONCLUSION: Preoperative MRI of IP can predict the location and extent of the tumor involvement in the paranasal sinuses and sometimes predicts malignant changes.
Activation and Abnormalities of Cell Cycle Regulating Factor in Head and Neck Squamous Cell Carcinoma Cell Lines: Abnormal Expression of CDKN2 Gene in Laryngeal Squamous Cell Carcinoma.
Si Youn Song, Tae Hee Han, Chang Hoon Bai, Yong Dae Kim, Kei Won Song
Yeungnam Univ J Med. 2005;22(2):166-182.   Published online December 31, 2005
DOI: https://doi.org/10.12701/yujm.2005.22.2.166
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AbstractAbstract PDF
BACKGROUND
Cyclin-dependent kinase (CDK) inhibitors are family of molecules that regulate the cell cycle. The CDKN2, a CDK4 inhibitor, also called p16, has been implicated in human tumorigenesis. The CDKN2 inhibits the cyclin/CDK complexes which regulate the transition from G1 to S phase of cell cycle. There is a previous report that homozygous deletion of CDKN2 region on chromosome 9p21 was detected frequently in astrocytoma, glioma and osteosarcoma, less frequently in lung cancer, leukemia and ovarian cancer, but not detected in colon cancer and neuroblastoma. However, little is known about the relationship between CDKN2 and laryngeal cancer. Therefore this study was initiated to investigate the role of CDKN2 in human laryngeal squamous cell carcinoma development. MATERIALS AND METHODS: We used 5 human laryngeal carcinoma cell lines whether they have deletions or losses of CDKN2 gene expression by DNA-PCR or RT-PCR, respectively. We examined 8 fresh frozen human laryngeal cancer tissues to detect the loss of heterozygosity (LOH) of CDKN2. PCR was performed by using microsatellite markers of short arm of human chromosome 9 (D9S126, D9S144, D9S156, D9S161, D9S162, D9S166, D9S171, D9S200 and D9SIFNA). For informative cases, allelic loss was scored if the signal of one allele was significantly decreased in tumor DNA when compared to the same allele in normal DNA. RESULTS: The CDKN2 DNA deletion was observed in 3 cell lines. The CDKN2 mRNA expression was observed in only one cell line, which was very weak. LOH was detected in 7 cases (87.5%). CONCLUSION: These results suggest that CDKN2 plays a role in the carcinogenesis of human laryngeal squamous cell carcinoma.
Clinical Characteristics and Prognostic Factors of Nasopharyngeal Cancer.
Chang Hoon Bai, Young Jung Seo, Sang Baik Ye, Young Ho Choi, Yong Dae Kim, Si Youn Song
Yeungnam Univ J Med. 2005;22(1):72-80.   Published online June 30, 2005
DOI: https://doi.org/10.12701/yujm.2005.22.1.72
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AbstractAbstract PDF
BACKGROUND
Nasopharyngeal cancer is a rare disease with a relatively poor prognosis because it tends to be diagnosed at an advanced stage. The aim of this study was to establish the clinical characteristics of nasopharyngeal cancer. MATERIALS AND METHODS: The medical records of 54 patients with nasopharyngeal cancer from January 1993 to December 2002 were reviewed retrospectively. Forty one cases were male (75.9%) and thirteen were female (24.1%). The average age was of 46.9 (range 16 to 78 years) years. The majority of patients (79.6%) were diagnosed in the advanced stage. The most common complaints were a neck mass (55.5%) and the WHO type III (53.7%) was the most frequent histological type. RESULTS: The cumulative survival rate for a 5-year period was 46.5% and the T stage, N stage, pathologic type, and clinical stage were not significantly related to the survival rate. Sixteen of 54 (31.5%) cases presented with a distant metastasis of the bone, lung, brain, spine, and liver, and six cases (11.1%) presented with a locoregional recurrence. CONCLUSION: TNM staging is not appropriate for predicting survival rate of nasopharyngeal carcinoma patients. Therefore, a newer staging system, which includes new factors, is needed to predict the prognosis.
Sinonasal Undifferentiated Carcinoma.
Yong Dae Kim, Dong Suk Kwak, Hyung Joong Lee, Jae Heun Sin, Chang Hoon Bai, Si Yeon Song
Yeungnam Univ J Med. 2004;21(1):120-126.   Published online June 30, 2004
DOI: https://doi.org/10.12701/yujm.2004.21.1.120
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AbstractAbstract PDF
Sinonasal Undifferentiated Carcinoma (SNUC) is a very rare, highly aggressive malignant tumor of the nasal cavity and paranasal sinuses. SNUC tends to present with advanced-stage disease, often with intracranial invasion. It requires an aggressive multimodality therapy that includes surgical resection. A cure rate of less than 20% is generally reported in the literature, with most patients dying within 1 year of onset of the disease. Three patients diagnosed as SNUC were treated at the Yeungnam University Medical Center between the years 2000 and 2003 were analyzed retrospectively. All patients presented with the disease very advanced. The three cases were given chemotherapy or chemotherapy with radiotherapy. Two patients died of the disease, surviving only 6 and 11 months following treatment, respectively. We did a follow-up on just the one remaining case with incomplete controlled disease for 27 months. The overall prognosis of SNUC is very poor. We consider that more intensive multimodality therapies are recommended for all patients with SNUC.

JYMS : Journal of Yeungnam Medical Science