Carcinoma, NeuroendocrineCarcinoma, Large CellCommon Bile Duct NeoplasmsNeuroendocrine TumorsAmpulla of VaterCarcinoma, Small CellFatal OutcomeCarcinoid TumorLung NeoplasmsImmunohistochemistryTumor Markers, BiologicalGenes, p16MyosarcomaTomography, X-Ray ComputedCarcinomaPrognosisCarcinoma, Squamous CellBiopsyCarcinoma, HepatocellularNeoplasms, Multiple PrimaryCarcinoma, Merkel CellAdenocarcinomaNeurosecretory SystemsNeoplasms, Complex and MixedRetrospective Studies