Cell CycleCell AgingCell Cycle ProteinsCell DivisionCell ProliferationCell Line, TumorFibroblastsCells, CulturedCell LineSignal TransductionErythrocyte AgingRNA, MessengerCell Cycle CheckpointsMice, Inbred C57BLTumor Suppressor Protein p53Tumor BurdenTransfectionNeoplasmsCell DifferentiationCyclin-Dependent Kinase Inhibitor p16Cyclin-Dependent Kinase Inhibitor p21ApoptosisNeoplasms, ExperimentalMolecular Sequence DataMice, KnockoutNeovascularization, PathologicTumor Suppressor ProteinsAnion Exchange Protein 1, ErythrocyteDNA DamageCyclinsFibrosarcomaTime FactorsCell Transformation, NeoplasticMice, NudeG1 Phasebeta-GalactosidaseRetinoblastoma ProteinTumor Markers, BiologicalCoculture TechniquesTumor MicroenvironmentMammary Neoplasms, ExperimentalTumor Necrosis Factor-alphaMitosisS PhaseNeoplasm TransplantationGene Expression Regulation, NeoplasticXenograft Model Antitumor AssaysDNA-Binding ProteinsNeoplasm MetastasisTelomereCell NucleusProtein-Serine-Threonine KinasesGene Expression RegulationAgingCell SurvivalBlotting, WesternFlow CytometryDiploidyMice, Inbred BALB CAdenocarcinomaTransplantation, HeterologousMelanoma, ExperimentalPhosphorylationGenes, Tumor SuppressorMice, SCIDCell MovementBase SequenceAntineoplastic AgentsTranscription FactorsDNA ReplicationG2 PhaseDown-RegulationModels, BiologicalWilms TumorRNA, Small InterferingDNAUp-RegulationMenstrual CyclePhenotypeHeterochromatinNuclear ProteinsBreast NeoplasmsTranscription, GeneticImmunohistochemistryCyclin-Dependent Kinase Inhibitor p27Gene ExpressionDisease ProgressionRNA InterferenceTumor Cells, CulturedTelomeraseHistonesMutationCarcinoid TumorMice, TransgenicG2 Phase Cell Cycle CheckpointsPromoter Regions, GeneticProtein BindingBrain NeoplasmsCyclin D1Neuroendocrine Tumors