This report is a retrospective review of histologically proven 106 primary lung cancer patients treated in theDept. of Tumor Clinic, PMC from Aug. 1986 to May, 1989. The results were as follows: 1. 94 cases were male and 12cases were female with average age of 57.7 year-old. 2. Histologically, the cancers were composed of 50 cases(47.1%) of epidermoid carcimoma, 38 cases(35.8%) of adenocarcinoma, 13 cases(12.2%) of small cell carcinoma, 5cases(3.1%) of large cell carcinoma. 3. Generalized symptoms were weight loss, fatigability, fever and headache inthe frequency order. And there were chest symptoms such as chest pain, coughing, dyspnea, hemoptysis and sputumproduction. 4. Lung cancer occurred frequently on the right side than the left one, and on the upper lobes thanthe lower ones. The occurrence ratio between central typed carcionomas and peripheral ones was 2.8:1, and most ofthem were poorly marginated masses with more than 5cm diameter in average size. 5. Epidermoid carcinomas showedmore atelectasis and formations than the other typed carcinomas. Adenocarcinomas showed msot common secondaryeffects of bronchial obstruction such as atelectasis and pneumonia, emphysema and frequent intra-pleuralmetastasis. There were so early hilar and mediastinal lymph node involvement in the small cell carcinoma caseslike as the larger cell carcinomas that they showed high degrees of diagnostic staging at the initial time ofcancer diagnosis. 6. Most of the patients (91 cases, 85.8%) of the primary lung cancer revealed above Stage IIIa.In these data, we can conclude that the clinical symptoms, characteristics of the CT scanning and metastaticpathway patterns can help us to decide the disease staging, to suspect pathological cell typing and to make thetherapeutic plans of the primary lung cancers