title: Is the increasing rate of local excision for stage I rectal cancer in the United States justified?: a nationwide cohort study from the National Cancer Database.
abstract: OBJECTIVE
  Determine rates of local excision (LE) over time, and test the hypothesis that LE carries increased oncologic risks but reduced perioperative morbidity when compared with standard resection (SR).
  
  
  BACKGROUND
  Despite the lack of level I/level II evidence supporting its oncologic adequacy, LE is performed for stage I rectal cancer.
  
  
  METHODS
  Surgical therapy for 35,179 patients with stage I rectal cancer diagnosed in 1989 to 2003 was examined over time, utilizing the National Cancer Database. A special study then analyzed perioperative outcomes, local recurrence and survival in 2124 patients diagnosed between 1994 and 1996, including 765 (T1, 601; T2, 164) treated by LE and 1359 (T1, 493; T2, 866) treated by SR.
  
  
  RESULTS
  From 1989 to 2003, the use of LE has increased (T1, 26.6-43.7%; T2, 5.8-16.8%; P < 0.001 both). The special study demonstrated significantly lower 30-day morbidity after LE versus SR (5.6% vs. 14.6%; P < 0.001). After adjusting for patient and tumor characteristics, the 5-year local recurrence after LE versus SR was 12.5 versus 6.9% (P = 0.003; hazard ratio = 0.38; 95% CI, 0.23-0.62) for T1 tumors, and 22.1 versus 15.1% (P = 0.01; hazard ratio = 0.69; 95% CI, 0.44-1.07) for T2 tumors. The 5-year overall survival (T1, 77.4% vs. 81.7%, P = 0.09; T2, 67.6% vs. 76.5%, P = 0.01) was influenced by age and comorbidities but not the type of surgery.
  
  
  CONCLUSIONS
  This study provides the best evidence for both the increasing use and the associated risks of LE versus SR. For each individual patient, the benefits of LE must be balanced against the heightened risk of local failure.
authors: Department of Surgery, Mayo Clinic, 200 First Street SW, Rochester, MN 55905, USA.
authors: Y Nancy
authors: YN
authors: You
authors: Nancy N
authors: NN
authors: Baxter
authors: Andrew
authors: A
authors: Stewart
authors: Heidi
authors: H
authors: Nelson
mesh_terms: D000230:Adenocarcinoma / Q000473:pathology / Q000601:surgery*; D000368:Aged; D015331:Cohort Studies; D016208:Databases, Factual; D013505:Digestive System Surgical Procedures / Q000706:statistics & numerical data* / Q000639:trends; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009367:Neoplasm Staging; D012004:Rectal Neoplasms / Q000473:pathology / Q000601:surgery*; D012189:Retrospective Studies; D016896:Treatment Outcome; D014481:United States