Ampulla of Vater/surgery; Common Bile Duct Neoplasms/surgery; Neuroendocrine Tumors/surgery; Pancreatic Neoplasms/surgery; Adult; Aged; Ampulla of Vater/pathology; Carcinoma, Ductal, Breast/diagnosis; Carcinoma, Ductal, Breast/pathology; Carcinoma, Ductal, Breast/surgery; Common Bile Duct Neoplasms/diagnosis; Common Bile Duct Neoplasms/mortality; Common Bile Duct Neoplasms/pathology; Female; Gastrinoma/diagnosis; Gastrinoma/mortality; Gastrinoma/pathology; Gastrinoma/surgery; Humans; Insulinoma/diagnosis; Insulinoma/mortality; Insulinoma/pathology; Insulinoma/surgery; Male; Middle Aged; Neoplasm Staging; Neuroendocrine Tumors/diagnosis; Neuroendocrine Tumors/mortality; Neuroendocrine Tumors/pathology; Palliative Care; Pancreas/pathology; Pancreatectomy; Pancreatic Neoplasms/diagnosis; Pancreatic Neoplasms/mortality; Pancreatic Neoplasms/pathology; Prognosis; Survival Rate; Vipoma/diagnosis; Vipoma/mortality; Vipoma/pathology; Vipoma/surgery