The result of ABC classification system for gastric cancer risk assessment (ABC classification) on mass screening for gastric cancer in Miyazaki city for five years

Abstract

We had started the upper gastrointestinal barium X-ray radiography (UGI-XR) on mass screening for gastric cancer at individual clinics in Miyazaki City. However, increasing examinees and replacing the members of Gastric Cancer Committee of Miyazaki Districts Medical Association and the instrument of UGI-XR had been a challenge for us. For these reasons, we started ABC classification system for gastric cancer risk assessment (ABC classification) in 2013. Then, we reported the result of ABC classification for 5 years from 2013 to 2017. Consequently in 5 years, the number of examinees, examinations needed to be completed (%), examinations completed (%), detected cancers (%), early-stage cancers (%), positive predictive value, and necessary cost of detecting one cancer were 43,990, 16,078 (36.5%), 11,173 (69.5%), 124 (0.28%), 102 (82.3%), 0.8%, and approximately 3,930,000 yen, respectively. The problems that ABC classification had were as follows: the ratio of examinations needed to be completed and examinees was high, and positive predictive value was low. However, ABC classification had more advantages: the number of examinees was high, several cancers were detected, the ratio of detected cancers and examinees was high, the ratio of early-stage cancers and all cancers was high, and the cost was cheap.