title: Obstacles to the improvement of radiotherapy of rectal cancer.
mesh_terms: D000230:Adenocarcinoma / Q000532:radiotherapy; D000818:Animals; D003520:Cyclophosphamide / Q000627:therapeutic use; D005472:Fluorouracil / Q000627:therapeutic use; D006801:Humans; D007813:Laparotomy; D008220:Lymphography; D008722:Methods; D009374:Neoplasms, Experimental / Q000532:radiotherapy; D011379:Prognosis; D012004:Rectal Neoplasms / Q000532:radiotherapy*; D013936:Thymidine / Q000378:metabolism; D014316:Tritium
chemical_list: D014316:Tritium; D003520:Cyclophosphamide; D005472:Fluorouracil; D013936:Thymidine