Mechanisms of resistance to methotrexate.
D004351:Drug Resistance; D005493:Folic Acid Antagonists; D006801:Humans; D008727:Methotrexate / Q000627:therapeutic use*; D009369:Neoplasms / Q000188:drug therapy*
D005493:Folic Acid Antagonists; D008727:Methotrexate