Thymidine MonophosphateSpermatocidal AgentsNeoplasmsAntineoplastic AgentsCell Line, TumorMice, NudeDrug Evaluation, PreclinicalGene Transfer TechniquesDrug Delivery SystemsXenograft Model Antitumor AssaysDisease Models, AnimalMice, Inbred BALB CCell ProliferationClinical Trials as TopicApoptosisGenetic TherapyStem CellsTime FactorsGenetic VectorsTumor Cells, CulturedCell SurvivalMice, Inbred C57BLAntibodies, MonoclonalTumor Markers, BiologicalSensitivity and SpecificityCell DifferentiationRats, Sprague-DawleySignal TransductionTreatment OutcomeCell LineCells, Cultured