Merkel CellsCarcinoma, Merkel CellMerkel cell polyomavirusPolyomavirus InfectionsCarcinomaSkin NeoplasmsPolyomavirusCarcinoma, Squamous CellIncidenceCarcinoma, HepatocellularKeratin-20Tumor Virus InfectionsCarcinoma in SituAntigens, Viral, TumorImmunohistochemistryCarcinoma, Basal CellVibrissaeCarcinoma, PapillaryMechanoreceptorsSkinFacial NeoplasmsTumor Markers, BiologicalLingual FrenumLiver NeoplasmsDNA NucleotidylexotransferaseCarcinoma, Ductal, BreastAntigens, Polyomavirus TransformingPrognosisNeoplasm StagingQuinacrineDNA, ViralApudomaImmunoenzyme TechniquesCell Line, TumorLung NeoplasmsCarcinoma, Transitional CellNeoplasm InvasivenessKeratin-8Enkephalin, MethionineSmall Cell Lung CarcinomaAdenocarcinomaCarcinoma, BronchogenicCarcinoma, Intraductal, NoninfiltratingGene Expression Regulation, NeoplasticLip NeoplasmsSurvival RateCarcinoma, Adenoid CysticSynaptophysinRisk FactorsCarcinoma, Small CellNerve EndingsBreast NeoplasmsLymphatic MetastasisRetrospective StudiesTime FactorsNeoplasm Recurrence, LocalCarcinoma, MedullaryEyelid NeoplasmsCheekNeuroendocrine Secretory Protein 7B2Carcinoma, LobularBlood Buffy CoatNeoplasm MetastasisFollow-Up StudiesThyroid NeoplasmsNasopharyngeal NeoplasmsEpidermisHair FollicleCarcinoma, NeuroendocrineTreatment OutcomeTumor Cells, CulturedKeratinsTouchNeoplasm ProteinsViral TropismEsophageal NeoplasmsCarcinoma, AdenosquamousCarcinoma, Mucoepidermoid