title: Duodenal gastrointestinal stromal tumor: clinical, pathologic, immunohistochemical characteristics, and surgical prognosis.
abstract: OBJECTIVE
  Gastrointestinal stromal tumors (GISTs) occur rarely in the duodenum. The characteristics of duodenal GIST have not been well clarified. The aim of this study is to clarify the characteristics and surgical prognosis of patients with primary duodenal GIST.
  
  
  METHODS
  Data of patients with surgically treated primary duodenal GIST were retrospectively analyzed. Immunohistochemical expressions of p53, p16, and Ki-67 were evaluated to explain the prognosis.
  
  
  RESULTS
  Compared with gastric or small intestinal GISTs in historical studies, duodenal GISTs had a relatively smaller size, lower mitotic count, lower Ki-67 LI, lower p16 loss, and similar p53 expression. The 1- and 3-year recurrence-free survival rates of patients with complete resection were 100 and 95.2%.
  
  
  CONCLUSIONS
  Patients with completely resected primary duodenal GIST seem to have a more favorable prognosis. This may be related to the different expressions of some immunohistological makers compared with GISTs of other locations.
authors.affiliation: Department of General Surgery, First Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, China.
authors.forename: Wei-Li
authors.initials: WL
authors.lastname: Yang
authors.forename: Ji-Ren
authors.initials: JR
authors.lastname: Yu
authors.forename: Yi-Jun
authors.initials: YJ
authors.lastname: Wu
authors.forename: Kan-Kai
authors.initials: KK
authors.lastname: Zhu
authors.forename: Wei
authors.initials: W
authors.lastname: Ding
authors.forename: Yuan
authors.initials: Y
authors.lastname: Gao
authors.forename: Qian-Yun
authors.initials: QY
authors.lastname: Shen
authors.forename: Ke-Zhen
authors.initials: KZ
authors.lastname: Lv
authors.forename: Qing
authors.initials: Q
authors.lastname: Zhang
authors.forename: Xiao-Jun
authors.initials: XJ
authors.lastname: Yang
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D019941:Cyclin-Dependent Kinase Inhibitor p16; D004379:Duodenal Neoplasms / Q000378:metabolism* / Q000401:mortality* / Q000473:pathology / Q000601:surgery; D005260:Female; D005500:Follow-Up Studies; D046152:Gastrointestinal Stromal Tumors / Q000378:metabolism* / Q000401:mortality* / Q000473:pathology / Q000601:surgery; D006801:Humans; D007150:Immunohistochemistry; D019394:Ki-67 Antigen / Q000378:metabolism; D008297:Male; D008875:Middle Aged; D009363:Neoplasm Proteins / Q000378:metabolism; D009364:Neoplasm Recurrence, Local; D011379:Prognosis; D012189:Retrospective Studies; D015996:Survival Rate; D016159:Tumor Suppressor Protein p53 / Q000378:metabolism
chemical_list: C000614131:CDKN2A protein, human; D019941:Cyclin-Dependent Kinase Inhibitor p16; D019394:Ki-67 Antigen; D009363:Neoplasm Proteins; D016159:Tumor Suppressor Protein p53