Neoplasm Regression, SpontaneousRegression AnalysisPancreatic NeoplasmsNeoplasmsNeoplasms, Cystic, Mucinous, and SerousLogistic ModelsSkin NeoplasmsRisk FactorsNeoplasms, Multiple PrimaryKidney NeoplasmsNeoplasms, Second PrimaryRetrospective StudiesLung NeoplasmsAdenocarcinoma, MucinousLinear ModelsThyroid NeoplasmsMyeloproliferative DisordersLiver NeoplasmsCohort StudiesDNA, Neoplasm