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Background and ObjectivesZZThe purpose of this study was to analyze the survival rate treatment modalities and certain prognostic factors in patients with external auditory canal (EAC)cancer using the University of Pittsburgh TNM Staging System. Subjects and MethodZZMedical records and radiological findings of 33 patients treated for EAC cancer between January 1995 and January 2009 were reviewed retrospectively. The median follow-up period was 65 months (range, 12-182 months). ResultsZZThe most common histological type was squamous cell carcinoma (19 patients;57.6%), followed by adenoid cystic carcinoma (9 patients; 27.3%), basal cell carcinoma (1 patient),adenocarcinoma (1 patient), rhabdomyosarcoma (1 patient), undifferentiated carcinoma (1 patient) and malignant small round cell tumor (1 patient). Seven of 33 patients died of EAC cancer and the overall survival rate was 70.6%. There was a significant difference in the survival rate with respect to TNM stages (p=.031). The 10 yr-survival rate of patients with stage I disease was 100.0%, whereas those of stages II, III and IV were 50.0, 80.0 and 58.3%, respectively. Five of 7 patients with recurrence had a history of initial positive resection margin. ConclusionZZEarly detection and proper surgical treatment with sufficient resection margin are essential for disease-specific survival and prevention of recurrence in patients with EAC cancer. Korean J Otorhinolaryngol-Head Neck Surg 2010;53:275-83

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