The aim of this study is to assess the effects of implementation of a non-endoscopic esophageal cancer-screening program on outcomes of interest in an asymptomatic high-risk population in Golestan Province, Iran. Study population will be recruited in two arms. In the intervention arm, cytological examination of the esophagus will be performed using a capsule sponge device. Subjects in the control arm will receive no intervention. All participants will be followed for 5 years. The outcomes of interest, including the incidence of esophageal cancer as well as mortality rates, will be compared between the two groups.