title: Phase II clinical study on stent therapy for unresectable malignant colorectal obstruction (JIVROSG-0206).
abstract: OBJECTIVE
  A phase II study of stent therapy for unresectable malignant colorectal obstruction was conducted to ascertain the clinical efficacy, safety, and procedural feasibility.
  
  
  METHODS
  Inclusion criteria comprised unresectable obstruction of the rectum or sigmoid colon; no other apparent stenosis; performance status by Eastern Cooperative Oncology Group ≤3; and maintained major organ function. The treatment protocol was to place an uncovered metal stent through the anus in an obstructive portion under x-ray fluoroscopic guidance. The patients were followed for 4 weeks after therapy, and the degree of improvement in subjective symptoms lasting ≥2 weeks was assessed as effective when the patient was decompressed with stent, or ineffective when not decompressed. Rate of clinical efficacy was defined as the proportion of effective cases.
  
  
  RESULTS
  The participants of the study comprised 33 patients (13 men and 20 women; mean age, 60 y). Rate of procedure completion was 97.0% (32/33). Treatment was effective in 27 patients, ineffective in 4, and unassessable in 1, yielding a clinical efficacy rate of 81.8% (27/33). Death owing to underlying disease (n=3), stent removal owing to anal pain (n=1), and occlusion at another location (n=1) were noted. No recurrences were seen among clinically effective cases. Adverse reactions included grades 2 to 3 diarrhea (n=12), pain (n=5), bleeding (n=1), and dysuria (n=1), but no grade 4 adverse reactions or treatment-related deaths were identified.
  
  
  CONCLUSIONS
  Stent therapy for unresectable malignant colorectal obstruction is effective, safe, and feasible.
authors.affiliation: Department of Diagnostic and Interventional Radiology, Aichi Cancer Center Hospital, Chikusa-ku, Nagoya, Japan. 105824@aichi-cc.jp
authors.forename: Yoshitaka
authors.initials: Y
authors.lastname: Inaba
authors.forename: Yasuaki
authors.initials: Y
authors.lastname: Arai
authors.forename: Hidekazu
authors.initials: H
authors.lastname: Yamaura
authors.forename: Yozo
authors.initials: Y
authors.lastname: Sato
authors.forename: Mina
authors.initials: M
authors.lastname: Kato
authors.forename: Hiroya
authors.initials: H
authors.lastname: Saito
authors.forename: Takeshi
authors.initials: T
authors.lastname: Aramaki
authors.forename: Mikio
authors.initials: M
authors.lastname: Sato
authors.forename: Takashi
authors.initials: T
authors.lastname: Kumada
authors.forename: Yoshito
authors.initials: Y
authors.lastname: Takeuchi
mesh_terms: D000328:Adult; D000368:Aged; D003967:Diarrhea / Q000209:etiology; D053159:Dysuria / Q000209:etiology; D005240:Feasibility Studies; D005260:Female; D005471:Fluoroscopy; D006471:Gastrointestinal Hemorrhage / Q000209:etiology; D006801:Humans; D007415:Intestinal Obstruction / Q000209:etiology* / Q000628:therapy*; D008297:Male; D008875:Middle Aged; D010146:Pain / Q000209:etiology; D010166:Palliative Care / Q000379:methods*; D012004:Rectal Neoplasms / Q000150:complications* / Q000628:therapy*; D012811:Sigmoid Neoplasms / Q000150:complications* / Q000628:therapy*; D015607:Stents / Q000009:adverse effects; D016896:Treatment Outcome