Abstract
Lung cancer is a major cause of cancer-related mortality worldwide. A mass screening program for lung cancer has been conducted since 2011 in Tsuzuki-ku, Yokohama, Japan. It includes a chest X ray for those age > 40 years. We investigated the tendency of lung cancer screening in the Tsuzuki area of Yokohama. The attendance rate for lung cancer screening program has been increasing every year in Yokohama City, including within the area of Tsuzuki. The rates of positive screening tests ranged from 8%～11%; they have been decreasing every year because of the output changes from film to digital. According to the higher rate, the cancer detection rate is also higher than the national data surveillance. Old inflammatory changes and bronchiectasis are the major results for false positive, and interstitial pneumonia is the next. However, this investigation revealed some problems yet to be resolved, such as, the difference of perception in judgment “d” and “e” between the guidelines and our area of Tsuzuki. Further investigations are needed to resolve these problems.
