Irradiation of the primary lesion of the rectum and rectosigmoid.
D000230:Adenocarcinoma / Q000532:radiotherapy*; D005500:Follow-Up Studies; D006801:Humans; D009362:Neoplasm Metastasis; D011300:Preoperative Care; D011879:Radiotherapy Dosage; D011882:Radiotherapy, High-Energy; D012004:Rectal Neoplasms / Q000532:radiotherapy* / Q000601:surgery; D012075:Remission, Spontaneous; D012811:Sigmoid Neoplasms / Q000532:radiotherapy* / Q000601:surgery; D013997:Time Factors