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The Center for Adult Diseases of Osaka conducts a mass-screening program to detect gastric cancer and serves as the central office of a prefecture-wide cancer registry. The gastric cancer mass-screening program was initially conducted using mobile units in the community, in several industrial companies and business offices in Osaka, and later, at the Center. The sensitivity of cancer detection and the efficiency of the mass-screening have been evaluated. Gastric cancer was detected in 260 cases (0.33%) of the 78,404 persons examined during the period June 1961 through December 1970. About one-third of the gastric cancers detected in this program were in the early stages which is in contrast to the 5% of early stage gastric cancers regularly detected at hospitals. In one community where a periodic mass-screening program for gastric cancer has continued for the last ten years, the age-adjusted mortality from gastric cancer was slightly lower in the second five-year period than in the first five-year period. It was also suggested that initial beneficial effects of the mass-examination for gastric cancer lasted for two to three years. It is recommended that a cooperative cancer prevention system be established to meet increasing demands for mass-screening in order to prevent cancer deaths.