Ampulla of VaterCommon Bile Duct NeoplasmsPancreaticoduodenectomyFallopian TubesDuodenal NeoplasmsDuodenoscopyCarcinoid TumorTumor Markers, BiologicalAdenocarcinomaCholangiopancreatography, Endoscopic RetrogradeBile Duct NeoplasmsTumor BurdenTumor Necrosis Factor-alphaCarcinoma, Signet Ring CellCommon Bile Duct DiseasesDuodenoscopesAnus, ImperforateJaundiceCell Line, TumorBiliary Tract NeoplasmsKrukenberg TumorDuodenumNeoplasms, Multiple PrimaryAdenoma, VillousSperm TransportPancreatic NeoplasmsPancreatic DuctsCarcinoma, NeuroendocrineGallstonesNeuroendocrine TumorsCommon Bile DuctWilms TumorKeratin-7Duodenal DiseasesOvum TransportAdenomaNeoplasms, ExperimentalGenes, Tumor SuppressorBiliary Tract Surgical ProceduresImmunohistochemistryTumor Suppressor Protein p53Hair Cells, AmpullaKeratin-20Tumor Suppressor ProteinsCarcinoma, Large CellNeoplasm StagingEndolymphBrain NeoplasmsSemicircular CanalsTumor Microenvironment