I Esophagus.- 1 Squamous Cell Carcinoma of the Esophagus.- Summary.- Epidemiology.- Etiology.- Symptoms and Clinical Signs.- Diagnostics.- Histological Classification and Molecular Genetics.- Staging.- Treatment.- Prognosis and Follow-Up.- Future Perspectives.- 2 Adenocarcinoma of the Esophagus.- Summary.- Epidemiology.- Etiology and Pathogenesis.- Symptoms and Clinical Signs.- Diagnosis.- Histological Classification and Molecular Genetics.- Staging.- Treatment.- Prognosis.- Future Perspectives.- 3 Other Tumors of the Esophagus.- Summary.- Mesenchymal Tumors of the Esophagus.- Endocrine Tumors of the Esophagus.- Lymphoma of the Esophagus.- Secondary Tumors of the Esophagus.- Melanoma of the Esophagus.- II Stomach.- 4 Gastric Cancer.- Summary.- Epidemiology.- Etiology and Pathogenesis.- Symptoms and Clinical Signs.- Diagnostics.- Histological Classification and Molecular Genetics.- Staging.- Treatment.- Prognosis.- Follow-Up.- Future Perspectives.- 5 Lymphoma of the Stomach.- Summary.- Epidemiology.- Etiology and Pathogenesis.- Symptoms and Clinical Signs.- Diagnostics.- Histological Classification and Molecular Genetics.- Staging.- Treatment.- Prognosis and Follow-Up.- Future Perspectives.- 6 Gastric Tumors Other than Adenocarcinoma and Lymphoma.- Summary.- Epithelial Tumors.- Mesenchymal Tumors of the Stomach.- III Small Intestine.- 7 Neoplasms of the Small Intestine.- Summary.- Epidemiology.- Etiology.- Symptoms and Clinical Signs.- Diagnostics.- Histological Classification and Molecular Genetics.- Staging.- Treatment.- Prognosis and Follow-Up.- Future Perspectives.- IV Colon and Rectum.- 8 Colorectal Cancer.- Summary.- Epidemiology.- Etiology and Pathogenesis.- Symptoms and Clinical Signs.- Diagnostics.- Histological Classification and Molecular Genetics.- Staging.- Treatment.- Future Perspectives.- 9 Sporadic Adenomas of the Large Intestine.- Summary.- Epidemiology.- Etiology and Pathogenesis.- Symptoms and Clinical Signs.- Diagnostics.- Histological Classification and Molecular Genetics.- Treatment.- Future Perspectives.- 10 Hereditary Polyposis Syndromes.- Summary.- Adenomatous Polyposis Syndromes.- Hamartomatous Polyposis Syndromes.- Juvenile Polyposis Syndrome (JPS).- Hereditary Mixed Polyposis Syndrome (HMPS).- 11 Hereditary Nonpolyposis Colorectal Cancer (Lynch Syndrome).- Summary.- Epidemiology.- Etiology and Pathogenesis.- Symptoms and Clinical Signs.- Diagnostics.- Histological Classification and Molecular Genetics.- Staging.- Treatment.- Prognosis.- Follow-Up.- Future Perspectives.- 12 Colorectal Cancer in Inflammatory Bowel Disease.- Summary.- Epidemiology.- Etiology and Pathogenesis.- Symptoms and Clinical Signs.- Diagnostics.- Histological Classification and Molecular Genetics.- Staging.- Treatment.- Prognosis and Follow-Up.- Future Perspectives.- V Anal Canal.- 13 Anal Carcinoma.- Summary.- Epidemiology.- Etiology and Pathogenesis.- Symptoms and Clinical Signs.- Diagnostics.- Histological Classification and Molecular Genetics.- Staging.- Treatment.- Prognosis.- Follow-Up.- Future Perspectives.- VI Pancreas.- 14 Neoplastic Lesions of the Pancreas.- Summary.- Adenocarcinoma of the Pancreas.- Cystic Carcinoma of the Pancreas.- Other Tumors.- VII Neuroendocrine Gastro-Entero-Pancreatic Tumors.- 15 Neuroendocrine Gastro-Entero-Pancreatic (GEP) Tumors.- Summary.- Definition.- Classification.- Epidemiology.- Etiology.- General Pathophysiology.- Histopathology.- Molecular Pathogenesis.- Growth Characteristics and Metastatic Spread and Secondary Non-Endocrine Malignancies.- Staging of Endocrine GEP Tumors.- Clinical Entities: Symptoms and Laboratory Findings.- General Aspect of Management.- VIII Biliary System and Papilla of Vater.- 16 Carcinoma of the Gallbladder and Bile Ducts.- Summary.- Epidemiology.- Etiology.- Symptoms and Clinical Signs.- Diagnostics.- Histological Classification and Molecular Genetics.- Staging.- Treatment.- Prognosis and Follow-Up.- Future Perspectives.- 17 Benign Tumors of the Biliary System.- Summary.- Epidemiology.- Etiology.- Symptoms and Clinical Signs.- Diagnostics.- Histological Classification and Molecular Genetics.- Staging.- Treatment.- Prognosis and Follow-Up.- Future Perspectives.- 18 Malignant Tumors of the Ampulla of Vater.- Summary.- Epidemiology.- Etiology.- Symptoms and Clinical Signs.- Diagnostics.- Histological Classification and Molecular Genetics.- Staging.- Treatment.- Prognosis and Follow-Up.- Future Perspectives.- IX Liver.- 19 Hepatocellular Carcinoma.- Summary.- Epidemiology.- Etiology and Pathogenesis.- Symptoms and Clinical Signs.- Diagnostics.- Histological Classification.- Staging.- Treatment.- Prognosis.- Follow-Up.- Future Perspectives.- 20 Colorectal Liver Metastases.- Summary.- Epidemiology.- Etiology and Pathogenesis.- Symptoms and Clinical Signs.- Diagnostics.- Histological Classification and Molecular Genetics.- Treatment.- Prognosis.- Follow-Up.- Future Perspectives.- 21 Liver Metastases of Noncolorectal Cancer.- Summary.- Epidemiology.- Symptoms and Clinical Signs.- Diagnostics 289.- Histological Classification and Molecular Genetics.- Treatment.- Prognosis and Follow-Up.- Future Perspectives.- Appendix (W. SCHEPPACH).- 22 Benign Liver Tumors.- Summary.- Epidemiology.- Etiology.- Symptoms and Clinical Signs.- Diagnostics.- Histological Classification and Molecular Genetics.- Treatment.- X Appendix.- 23 Supportive Care of Patients with Gastrointestinal and Liver Tumors.- Summary.- Nutritional Support.- Analgesic Therapy.- Antiemetic Therapy.- Management of Malignancy-Related Ascites.- Management of Bowel Obstruction Due to Peritoneal Carcinomatosis.- End-of-life Care.- XI Addendum.