CamptothecinTopoisomerase I InhibitorsTopotecanOrganosilicon CompoundsAntineoplastic Agents, PhytogenicDNA Topoisomerases, Type IAntineoplastic AgentsNeoplasmsDrug Screening Assays, AntitumorCell Line, TumorTopoisomerase InhibitorsDNA DamageApoptosisCamptothecaTumor Cells, CulturedEnzyme InhibitorsMolecular StructureStructure-Activity RelationshipTeniposideCell SurvivalDrug Resistance, NeoplasmInhibitory Concentration 50Topoisomerase II InhibitorsEtoposideDose-Response Relationship, DrugDNA Topoisomerases, Type IIDNAKB CellsCell CycleRubiaceaeAphidicolinDoxorubicinMice, NudeXenograft Model Antitumor AssaysOrganic Chemistry PhenomenaKineticsDrug Synergism