title: Branch-duct intraductal papillary mucinous neoplasms: observations in 145 patients who underwent resection.
abstract: OBJECTIVE
  Intraductal papillary mucinous neoplasms (IPMNs) of the pancreas arising in branch ducts are thought to be less aggressive than their main-duct counterparts, and guidelines for their conservative management were recently proposed. This study describes the combined experience of 2 tertiary centers with branch-duct IPMNs aiming to validate these recommendations.
  
  
  METHODS
  A review of 145 patients with resected, pathologically confirmed, branch-duct IPMNs between 1990 and 2005 was conducted.
  
  
  RESULTS
  Sixty-six patients (45.5%) had adenoma, 47 (32%) borderline tumors, 16 (11%) carcinoma in situ, and 16 (11%) invasive carcinoma. Median age was similar between benign and malignant subgroups (66 vs 67.5 years, respectively). Jaundice was more frequent in patients with cancer (12.5% vs 1.8%, respectively, P = .022) and abdominal pain in patients with benign tumors (45% vs 25%, respectively, P = .025). Forty percent of tumors were discovered incidentally. Findings associated with malignancy were the presence of a thick wall (P < .001), nodules (P < .001), and tumor diameter >or=30 mm (P < .001). All neoplasms with cancer were larger than 30 mm in size or had nodules or caused symptoms. After a mean follow-up of 45 months, the 5-year disease-specific survival for branch-duct IPMNs with noninvasive neoplasms was 100% and, for invasive cancer, was 63%.
  
  
  CONCLUSIONS
  This large cohort of resected branch-duct IPMNs shows that cancer is present in 22% of cases and validates the recent guidelines that indicate absence of malignancy in tumors <30 mm, without symptoms or mural nodules.
authors.affiliation: Department of Surgery, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts 02114, USA.
authors.forename: J Ruben
authors.initials: JR
authors.lastname: Rodriguez
authors.forename: Roberto
authors.initials: R
authors.lastname: Salvia
authors.forename: Stefano
authors.initials: S
authors.lastname: Crippa
authors.forename: Andrew L
authors.initials: AL
authors.lastname: Warshaw
authors.forename: Claudio
authors.initials: C
authors.lastname: Bassi
authors.forename: Massimo
authors.initials: M
authors.lastname: Falconi
authors.forename: Sarah P
authors.initials: SP
authors.lastname: Thayer
authors.forename: Gregory Y
authors.initials: GY
authors.lastname: Lauwers
authors.forename: Paola
authors.initials: P
authors.lastname: Capelli
authors.forename: Mari
authors.initials: M
authors.lastname: Mino-Kenudson
authors.forename: Oswaldo
authors.initials: O
authors.lastname: Razo
authors.forename: Deborah
authors.initials: D
authors.lastname: McGrath
authors.forename: Paolo
authors.initials: P
authors.lastname: Pederzoli
authors.forename: Carlos
authors.initials: C
authors.lastname: Fernández-Del Castillo
mesh_terms: D002288:Adenocarcinoma, Mucinous / Q000401:mortality / Q000473:pathology / Q000601:surgery*; D000236:Adenoma / Q000401:mortality / Q000473:pathology / Q000601:surgery; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D002278:Carcinoma in Situ / Q000401:mortality / Q000473:pathology / Q000601:surgery; D021441:Carcinoma, Pancreatic Ductal / Q000401:mortality / Q000473:pathology / Q000601:surgery*; D002291:Carcinoma, Papillary / Q000401:mortality / Q000473:pathology / Q000601:surgery*; D015331:Cohort Studies; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008875:Middle Aged; D009364:Neoplasm Recurrence, Local / Q000401:mortality; D010190:Pancreatic Neoplasms / Q000401:mortality / Q000473:pathology / Q000601:surgery*; D011183:Postoperative Complications / Q000401:mortality; D017410:Practice Guidelines as Topic / Q000592:standards; D016019:Survival Analysis