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.