title: Radical radiotherapy versus abdominoperineal resection as primary treatment of carcinoma of the lower rectum.
mesh_terms: D000005:Abdomen / Q000601:surgery; D006801:Humans; D009864:Ontario; D010502:Perineum / Q000601:surgery; D012004:Rectal Neoplasms / Q000401:mortality / Q000532:radiotherapy* / Q000601:surgery*; D012189:Retrospective Studies