title: Local invasion of the bladder with colorectal cancers: surgical management and patterns of local recurrence.
abstract: OBJECTIVE
  Colorectal cancers may be adherent to the urinary bladder. To achieve oncologic clearance of the cancer, en bloc bladder resection should be performed. This study describes the multicenter experiences of en bloc bladder resection for colorectal cancer in the major New Zealand public hospitals.
  
  
  METHODS
  A retrospective database of patients undergoing surgery for colorectal cancer adherent to the bladder between 1984 and 1999 was constructed. Data was analyzed for age, gender, disease stage, and outcome (local recurrence and survival).
  
  
  RESULTS
  Fifty-three patients were identified: International Union Against Cancer and American Joint Committee on Cancer Stage 1=0; Stage 2=23; Stage 3=22; Stage 4=6; unknown=2. Forty-five had en bloc partial cystectomy performed, four en bloc total cystectomy, and four had the adhesions disrupted and no bladder resection. The most common site of the primary colorectal cancer is sigmoid colon, with local invasion into the dome of the bladder. All patients who did not have en bloc resection developed local recurrence and died from their disease. Mean follow-up was 62 months. The extent of bladder resection did not seem important in determining local recurrence.
  
  
  CONCLUSIONS
  En bloc resection of the urinary bladder should be performed if the patient is to be offered an optimal oncologic resection for adherent colorectal cancer. The decision to perform total rather than partial cystectomy should be based on the anatomic location of the tumor. Because the sigmoid is usually the primary site, most patients will not have received preoperative radiation. Therefore, postoperative radiotherapy may reduce local recurrence in these patients.
authors.affiliation: Colorectal Unit, Department of Surgery, Christchurch Hospital, Christchurch, New Zealand.
authors.forename: P W G
authors.initials: PW
authors.lastname: Carne
authors.forename: J N R
authors.initials: JN
authors.lastname: Frye
authors.forename: A
authors.initials: A
authors.lastname: Kennedy-Smith
authors.forename: J
authors.initials: J
authors.lastname: Keating
authors.forename: A
authors.initials: A
authors.lastname: Merrie
authors.forename: E
authors.initials: E
authors.lastname: Dennett
authors.forename: F A
authors.initials: FA
authors.lastname: Frizelle
mesh_terms: D000230:Adenocarcinoma / Q000473:pathology / Q000601:surgery*; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D015179:Colorectal Neoplasms / Q000473:pathology / Q000601:surgery*; D015653:Cystectomy; D005260:Female; D006785:Hospitals, University; D006801:Humans; D008297:Male; D008875:Middle Aged; D009361:Neoplasm Invasiveness; D009364:Neoplasm Recurrence, Local / Q000473:pathology* / Q000601:surgery; D009520:New Zealand; D012189:Retrospective Studies; D001743:Urinary Bladder / Q000473:pathology* / Q000601:surgery