title: The role of preoperatiave irradiation in cancer of the rectum and rectosigmoid.
mesh_terms: D005069:Evaluation Studies as Topic; D006801:Humans; D008207:Lymphatic Metastasis; D011300:Preoperative Care; D011879:Radiotherapy Dosage; D012004:Rectal Neoplasms / Q000401:mortality / Q000532:radiotherapy* / Q000601:surgery; D012811:Sigmoid Neoplasms / Q000401:mortality / Q000532:radiotherapy* / Q000601:surgery