Abstract
NAKADA, T., SATO, H., SAITO, Y. and FUJIMURA, S. Detection of Early Lung Cancer. Results of Radiologic and Cytologic Screening in the Miyagi Program. Tohoku J. exp. Med., 1987, 152(2), 173-186-Eighty-eight lung cancers including 82 primary and 6 metastatic tumors were detected by chest x-ray examination of a total of 363, 320 participants in Miyagi Prefecture in Japan during 3 years period from 1982 to 1984. Sputum cytology was performed in the high-risk group (above 50 years of age with cigarette index above 600) of the total participants during the same period. This detected 67 patients with malignant tumors including 5 with cancer of the upper respiratory tract and 62 with primary lung cancer. Fifty-one of 67 cancers (82.3%) detected by sputum cytology were radiographically occult lung cancers. The annual ratio of the detection of lung cancer was 45/100, 000 in the first year, however, it decreased to 38/100, 000 in the second year and to 15/100, 000 in the third year. Cancer resection was performed in 63.6%, 76.1% and 80.0% of the patients, in the first, the second and the third year, respectively. On the average, 57% of the patients who underwent cancer resection demonstrated early lung cancer. Especially, 45 of 51 patients with lung cancer detected by sputum cytology underwent tumor resection, of which 40 (89%) bore early lung cancer.
