title: Current issues in locally advanced colorectal cancer treated by preoperative chemoradiotherapy.
abstract: In patients with locally advanced rectal cancer, preoperative chemoradiotherapy has proven to significantly improve local control and cause lower treatment-related toxicity compared with postoperative adjuvant treatment. Preoperative chemoradiotherapy followed by total mesorectal excision or tumor specific mesorectal excision has evolved as the standard treatment for locally advanced rectal cancer. The paradigm shift from postoperative to preoperative therapy has raised a series of concerns however that have practical clinical implications. These include the method used to predict patients who will show good response, sphincter preservation, the application of conservative management such as local excision or "wait-and-watch" in patients obtaining a good response following preoperative chemoradiotherapy, and the role of adjuvant chemotherapy. This review addresses these current issues in patients with locally advanced rectal cancer treated by preoperative chemoradiotherapy.
authors.affiliation: In Ja Park, Chang Sik Yu, Department of Colon and Rectal Surgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul 138-736, South Korea.
authors.forename: In Ja
authors.initials: IJ
authors.lastname: Park
authors.affiliation: In Ja Park, Chang Sik Yu, Department of Colon and Rectal Surgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul 138-736, South Korea.
authors.forename: Chang Sik
authors.initials: CS
authors.lastname: Yu
mesh_terms: D059248:Chemoradiotherapy; D017024:Chemotherapy, Adjuvant; D002986:Clinical Trials as Topic; D015179:Colorectal Neoplasms / Q000188:drug therapy* / Q000532:radiotherapy* / Q000601:surgery*; D003131:Combined Modality Therapy; D006801:Humans; D020360:Neoadjuvant Therapy; D057234:Preoperative Period; D012008:Recurrence; D016896:Treatment Outcome; D057832:Watchful Waiting
keywords: Colorectal cancer; Conservative; Preoperative chemoradiotherapy; Rectal cancer; Response