Merkel CellsCarcinoma, Merkel CellMerkel cell polyomavirusPolyomavirus InfectionsBiopsyCarcinomaSkin NeoplasmsPolyomavirusCarcinoma, Squamous CellKeratin-20Carcinoma, HepatocellularTumor Virus InfectionsBiopsy, NeedleCarcinoma in SituImmunohistochemistryAntigens, Viral, TumorCarcinoma, Basal CellVibrissaeCarcinoma, PapillarySkinTumor Markers, BiologicalMechanoreceptorsFacial NeoplasmsLingual FrenumLiver NeoplasmsCarcinoma, Ductal, BreastDNA NucleotidylexotransferaseAntigens, Polyomavirus TransformingPrognosisNeoplasm StagingDNA, ViralQuinacrineImmunoenzyme TechniquesApudomaCell Line, TumorNeoplasm InvasivenessCarcinoma, Transitional CellKeratin-8Lung NeoplasmsCarcinoma, Intraductal, NoninfiltratingEnkephalin, MethionineSmall Cell Lung CarcinomaCarcinoma, BronchogenicGene Expression Regulation, NeoplasticAdenocarcinomaLymphatic MetastasisSynaptophysinCarcinoma, Adenoid CysticLip NeoplasmsBreast NeoplasmsCarcinoma, Small CellNerve EndingsCarcinoma, LobularNeoplasm Recurrence, LocalCheekEyelid NeoplasmsCarcinoma, MedullaryNeuroendocrine Secretory Protein 7B2Blood Buffy CoatEpidermisNeoplasm MetastasisNasopharyngeal NeoplasmsCarcinoma, NeuroendocrineThyroid NeoplasmsHair FollicleSentinel Lymph Node BiopsySurvival RateFatal OutcomeKeratinsTumor Cells, CulturedNeoplasm ProteinsTouchBiopsy, Fine-NeedleCarcinoma, AdenosquamousViral TropismBK VirusCarcinoma, Mucoepidermoid