Vinca AlkaloidsAlkaloidsVincaVinblastineVincristineAntineoplastic AgentsAntineoplastic Agents, PhytogenicErgot AlkaloidsVindesineTubulinLeukemia P388Indole AlkaloidsPodophyllotoxinPyrrolizidine AlkaloidsMicrotubulesDrug ResistanceP-GlycoproteinTubulin ModulatorsColchicineAntimitotic AgentsMaytansineCinchona AlkaloidsDrug Screening Assays, AntitumorDoxorubicinDrug AntagonismDaunorubicinBerberine AlkaloidsAmaryllidaceae AlkaloidsSarcoma 180Drug Resistance, MultipleDrug Resistance, NeoplasmMolecular StructureTumor Cells, CulturedMitosisVerapamilPaclitaxelCatharanthusAnthracyclinesDose-Response Relationship, DrugAconitumCell Line, TumorCell Survival