Methotrexate and radiation.
D002453:Cell Cycle / Q000187:drug effects; D002470:Cell Survival / Q000187:drug effects / Q000528:radiation effects; D004247:DNA / Q000096:biosynthesis; D004307:Dose-Response Relationship, Radiation; D006258:Head and Neck Neoplasms / Q000188:drug therapy / Q000532:radiotherapy*; D006801:Humans; D008297:Male; D008727:Methotrexate / Q000009:adverse effects / Q000627:therapeutic use*
D004247:DNA; D008727:Methotrexate