Mesh : Biopsy Cardia / pathology Cell Cycle / physiology Cell Death / physiology Cell Division / physiology Cell Transformation, Neoplastic / pathology Digestive System / pathology Esophageal Neoplasms / pathology Flow Cytometry Gastrointestinal Neoplasms / pathology therapy Humans Idoxuridine Mathematical Computing Practice Guidelines as Topic Prognosis Stomach Neoplasms / pathology