title: Body mass index does not affect postoperative morbidity and oncologic outcomes of total mesorectal excision for rectal adenocarcinoma.
abstract: BACKGROUND
  Obesity adds to the technical difficulty of colorectal surgery and is a risk factor for postoperative complications. We hypothesized that obese patients have increased morbidity and poor oncologic outcomes after proctectomy for rectal adenocarcinoma.
  
  
  METHODS
  Adult patients undergoing total mesorectal excision (TME) for rectal adenocarcinoma at a tertiary referral center were retrospectively identified from a prospectively maintained database. Operative characteristics, postoperative complication rates, and oncologic outcomes were compared in patients with BMI > or = 30 kg/m(2) and BMI < 30 kg/m(2).
  
  
  RESULTS
  Between 1997 and 2009, 254 patients underwent proctectomy for rectal adenocarcinoma, of whom 27% were obese. There were no significant differences in demographics, comorbidities or preoperative oncologic characteristics between obese and nonobese groups. Patients with BMI > or = 30 kg/m(2) had longer operative times (p = 0.04) and higher intraoperative blood loss (p < 0.001) but comparable postoperative complication rates (p = 0.80), number of lymph nodes retrieved (p = 0.57), margin-negative resections (p = 0.44), and disease-free survival (p = 0.11). Obese patients had longer overall survival (p = 0.05). Tumor stage was the only variable associated with disease-free (p < 0.001) and overall survival (p < 0.001).
  
  
  CONCLUSIONS
  Despite increased technical difficulty of resection, obesity does not increase the risk of postoperative morbidity or adversely affect oncologic outcomes after total mesorectal excision of rectal adenocarcinoma.
authors.affiliation: Department of Surgery, University of Wisconsin School of Medicine and Public Health, Madison, WI, USA.
authors.forename: Nikiforos
authors.initials: N
authors.lastname: Ballian
authors.forename: Brett
authors.initials: B
authors.lastname: Yamane
authors.forename: Glen
authors.initials: G
authors.lastname: Leverson
authors.forename: Bruce
authors.initials: B
authors.lastname: Harms
authors.forename: Charles P
authors.initials: CP
authors.lastname: Heise
authors.forename: Eugene F
authors.initials: EF
authors.lastname: Foley
authors.forename: Gregory D
authors.initials: GD
authors.lastname: Kennedy
mesh_terms: D000230:Adenocarcinoma / Q000401:mortality / Q000473:pathology / Q000601:surgery*; D000368:Aged; D015992:Body Mass Index; D003082:Colectomy / Q000379:methods*; D013505:Digestive System Surgical Procedures / Q000379:methods; D018572:Disease-Free Survival; D005260:Female; D006801:Humans; D007902:Length of Stay / Q000706:statistics & numerical data; D008297:Male; D008499:Medical Records; D008875:Middle Aged; D009364:Neoplasm Recurrence, Local / Q000517:prevention & control; D009367:Neoplasm Staging; D009765:Obesity / Q000150:complications*; D011184:Postoperative Period; D012004:Rectal Neoplasms / Q000150:complications / Q000401:mortality / Q000473:pathology / Q000601:surgery*; D012189:Retrospective Studies; D015996:Survival Rate; D016896:Treatment Outcome