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Four hundred and eighty cases of primary 1ung tumors were presented during the period of 1Z years from 1968 to 1979 in the Department of Pathology, CoIiege of Medicine, Seoul National University. Authors. classified them histopathologically according to the W.H.O. international classification of diseases for oncology, and studied on their occurence, prevalence and frequency with clinical information, and the results obtained were as follows. 1. Sixth and seventh decades of life were predominant in their morbidity. 2. Incidences by histopathologic classification were made as epidermoid carcinoraa: 47. 7%, small cell anaplas´tic carcinoma: 16. 9%, undifferentiated large cell carcinoma: 16.3%, and adenocarcinoma: 10.4%. 3. Male was dominant to female in sex difference incidence(5:1), especially on epidermoid carcinoma and small cell anaplastic carcinoma. 4. Among the group of smokers, epidermoid carcinoma and small cell anaplastic carcinoma showed high incidence, while no recognigible difference was noted in histopathol.ogic type among the non-smokers. 5. Cough was the most common (32.1%) chief complaint, and others were dyspnea, chest pain, hoarseness, and general weakness in order. Durations of the chief complaints were less than 6 months in most cases. 6. Frequent metastatic lesions were mostly cervical and supraclavicular lymph nodes (32.3%) and pleura (15.0%).
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