Patient data will be collected from medical records retrospectively.
This study aims to development of a database through a web page for epidemiological and clinical research purposes that is accessible to members of the AGAMENON - SEOM group that guarantees a rigorous collection, exploitation and analysis of the data and information contained, increases the knowledge of esophageal and stomach cancer in order to optimize the management, treatment and evolution of patients, the possibility of comparing variables with those of other series or groups, and promotes the quality of scientific publications.