title: Evaluation of radiation therapy factors in prophylactic central nervous system irradiation for childhood leukemia: a report from the Children's Cancer Study Group.
mesh_terms: D000208:Acute Disease; D000293:Adolescent; D002648:Child; D002675:Child, Preschool; D002986:Clinical Trials as Topic; D005260:Female; D006801:Humans; D007223:Infant; D007278:Injections, Spinal; D007938:Leukemia / Q000188:drug therapy / Q000532:radiotherapy*; D008297:Male; D008577:Meningeal Neoplasms / Q000188:drug therapy / Q000532:radiotherapy*; D008727:Methotrexate / Q000008:administration & dosage; D011878:Radiotherapy / Q000009:adverse effects; D011897:Random Allocation
chemical_list: D008727:Methotrexate