title: New aspects of clinical drug resistance: the role of gene amplification and the reversal of resistance in drug refractory cancer.
authors.forename: R F
authors.initials: RF
authors.lastname: Ozols
authors.forename: K
authors.initials: K
authors.lastname: Cowan
mesh_terms: D002121:Calcium Channel Blockers / Q000494:pharmacology; D004351:Drug Resistance / Q000235:genetics; D005784:Gene Amplification; D005978:Glutathione / Q000502:physiology; D006801:Humans; D008727:Methotrexate / Q000494:pharmacology; D009369:Neoplasms / Q000188:drug therapy*
chemical_list: D002121:Calcium Channel Blockers; D005978:Glutathione; D008727:Methotrexate