Basics of Chemotherapy -- Esophageal Cancer: Clinical Data -- Esophageal Cancer: Contouring and treatment planning -- Gastric Cancer: Clinical Data -- Gastric Cancer: Contouring and treatment planning -- Pancreatic Cancer: Clinical Data -- Pancreatic Cancer: Contouring and treatment planning -- Primary Liver Cancer (hepatocellular carcinoma and Intrahepatic Cholangiocarcinoma): Clinical Data -- Primary Liver Cancer (hepatocellular carcinoma and Intrahepatic Cholangiocarcinoma): Contouring and treatment planning -- Biliary Cancer (Extrahepatic Bile Duct and Gallbladder): Clinical Data -- Biliary Cancer (Extrahepatic Bile Duct and Gallbladder): Contouring and treatment planning -- Colon Cancer: Clinical Data -- Colon Cancer: Contouring and treatment planning -- Rectal Cancer: Clinical Data -- Rectal Cancer: Contouring and treatment planning -- Anal Cancer: Clinical Data -- Anal Cancer: Contouring and treatment planning -- Pelvic Recurrences: Clinical Data -- Pelvic Recurrences: Contouring, treatment planning, and Intra-operative Radiation Therapy -- Stereotactic Body Radiation Therapy to the Liver for Metastatic disease: Clinical Data -- Stereotactic Body Radiation Therapy to the Liver for Metastatic disease: Contouring and treatment planning.