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.

Patient data will be collected from medical records retrospectively.

Inclusion Criteria:

• Adult patient (≥18 years) diagnosed with carcinoma of the esophagus, gastroesophageal junction and stomach, including all histologic subtypes, with or without erbB2 overexpression (and tumors in which this data is unknown).
• Follow-up of at least 3 months with clinical information during this period, exempting patients with early death from any cause.

Exclusion Criteria:

• A patient for whom, for whatever reason, the information necessary to complete the database cannot be known or obtained.

The study plans to enroll patients with histologically confirmed carcinoma of the esophagus, gastroesophageal junction, and stomach. The inclusion of patients is required to be done consecutively, being valid any time point if data are available.