Vinca AlkaloidsAlkaloidsVinblastineVincaVincristineAntineoplastic Agents, PhytogenicErgot AlkaloidsVindesineDoxorubicinLeukemia P388TubulinPodophyllotoxinIndole AlkaloidsDrug ResistanceP-GlycoproteinPyrrolizidine AlkaloidsMicrotubulesColchicineAntimitotic AgentsTubulin ModulatorsMaytansineAntineoplastic AgentsDaunorubicinCinchona AlkaloidsDrug AntagonismDrug Resistance, MultipleBerberine AlkaloidsDrug Screening Assays, AntitumorAntineoplastic Combined Chemotherapy ProtocolsVerapamilCyclophosphamideSarcoma 180Drug Resistance, NeoplasmCatharanthusMitosisAmaryllidaceae AlkaloidsTumor Cells, CulturedMolecular StructurePaclitaxelDose-Response Relationship, DrugAnthracyclinesAconitumEtoposideDrug Administration ScheduleLomustine