title: Limited effectiveness of in vitro high-dose methotrexate and leucovorin to overcome resistance in L1210 leukemia cells with elevations of dihydrofolate reductase.
mesh_terms: D000818:Animals; D002455:Cell Division / Q000187:drug effects; D002460:Cell Line; D004273:DNA, Neoplasm / Q000096:biosynthesis; D004305:Dose-Response Relationship, Drug; D004351:Drug Resistance; D002955:Leucovorin / Q000494:pharmacology*; D007939:Leukemia L1210 / Q000201:enzymology* / Q000473:pathology; D008727:Methotrexate / Q000494:pharmacology*; D013762:Tetrahydrofolate Dehydrogenase / Q000378:metabolism
chemical_list: D004273:DNA, Neoplasm; D013762:Tetrahydrofolate Dehydrogenase; D002955:Leucovorin; D008727:Methotrexate