[On resistance to antineoplastic drugs].
D000818:Animals; D000970:Antineoplastic Agents / Q000627:therapeutic use*; D004361:Drug Tolerance; D007938:Leukemia / Q000188:drug therapy; D007942:Leukemia, Experimental / Q000188:drug therapy; D008727:Methotrexate / Q000627:therapeutic use; D051379:Mice; D012517:Sarcoma, Yoshida / Q000188:drug therapy
D000970:Antineoplastic Agents; D008727:Methotrexate