 |
Vol.47 No.1 contents | Japanese/English |
 | Full Text of PDF (338K) Article in Japanese |
- Original Article -
Comparison of Clinical Characteristics of Lung Cancer Cases According to the Detection Method
Susumu Sasano1, Yoko Torii1, Takamasa Onuki21Department of Respirology, Tokyo Metropolitan Tama Cancer Detection Center, Japan, 2Department of Surgery I, Tokyo Women's Medical University, School of Medicine, Japan
Objective. We examined the characteristics of lung cancer cases according to the detection method. Methods. A total of 53,427 persons underwent lung cancer screening with chest X-ray and sputum cytology from 1998 to 2005. Forty-two lung cancer cases were detected by lung cancer screening. We classified them into 3 groups according to the detection method; the chest X-ray group, the sputum cytology group, and the chest X-ray plus sputum cytology group, in order to compare the clinical characteristics of these groups. Results. There were 28 lung cancer cases in the chest X-ray group, 5 in the sputum cytology group, and 9 in the chest X-ray plus sputum cytology group. Although the average age did not show a statistically significant difference, the ratio of gender showed a statistically significant difference among 3 groups. The smoking index was high in the sputum cytology group. The mean diameter of the detected tumors was 2.8±1.3 cm in the chest X-ray group, 0.7±0.3 cm in the sputum cytology group, and 4.5±2.2 cm in the chest X-ray plus sputum cytology group, showing a statistically significant difference for all groups. The rate of clinical stage IA lung cancer cases was 53.6% in the chest X-ray group, 100.0% in the sputum cytology group, and 22.2% in the chest X-ray plus sputum cytology group, showing a statistically significant difference for all groups. The surgical resection rate and the complete resection rate were high in the sputum cytology group. Conclusion. This study revealed that sputum cytology was effective in detecting early lung cancer.
key words: Lung cancer screening, Lung cancer, Chest X-ray, Sputum cytology
Received: October 3, 2006
Accepted: December 6, 2006
JJLC 47 (1): 21-25, 2007
