[Significance and effectiveness of preoperative radiotherapy in esophageal neoplasms].
D000368:Aged; D002294:Carcinoma, Squamous Cell / Q000532:radiotherapy* / Q000601:surgery; D004938:Esophageal Neoplasms / Q000532:radiotherapy* / Q000601:surgery; D006801:Humans; D008297:Male; D008875:Middle Aged; D011300:Preoperative Care; D011879:Radiotherapy Dosage