Document Type : Research Articles
Division of Endoscopy, Faculty of Medicine, Tohoku Medical and Pharmaceutical University, Sendai, Japan.
Division of Medical Support and Partnership, Center for Cancer Control and Information Service, National Cancer Center, Tokyo, japan.
Division of Screening Assessment and Management, Center for Public Health Service, National Cancer Center, Tokyo, Japan.
Division of Chest Surgery, Faculty of Medicine, Tohoku Medical and Pharmaceutical University, Sendai, Japan.
Background: The participation rate is one of the most important indexes in the cancer screening. Historically
in Japan, each local government has developed their own equations to calculate the subjects for population-based
screening, which were different from each other, and therefore the participation rates of screening were not comparable.
Recently, local governments were ordered to use the standardized equation in reporting data, which made it possible
to compare the participation rates of cancer screening nationwide for the first time. We therefore investigated the
correlation between the prefectural lung cancer mortality and several indicators of lung cancer screening. Methods:
The prefectural participation rates of lung, gastric and colonic cancer screening, test positive rates, attendance rates
for further examination, lung cancer detection rates and positive predictive values of lung cancer screening were
collected from “Cancer Registration and Statistics” of the National Cancer Research Center website. The age-adjusted
lung, gastric and colonic cancer mortality rates, smoking rates were also collected. The EZR software program was
used for statistical analyses. Results: The participation rates of lung cancer screening had a strong positive correlation
with the participation rates of gastric/colonic cancer screening (P<0.001). The prefectural lung cancer mortality rates
had a moderate to weak negative correlation with the participation rates of lung cancer screening (P=0.009). A little
correlation was noted between other quality assurance indicators of lung cancer screening and lung cancer mortality
rates. Conclusion: These results suggested that participating in lung cancer screening might help reduce lung cancer
mortality rates in some extent.