title: [Clinical study of gastrointestinal stromal tumors].
abstract: OBJECTIVE
  To investigate the clinicopathological characteristics, surgical treatment and prognosis of gastrointestinal stromal tumors(GIST).
  
  
  METHODS
  The clinicopathological data of 84 patients with GIST undergone resection between April 1997 and June 2008 were analyzed retrospectively, and the prognosis was evaluated.
  
  
  RESULTS
  Out of 84 cases, 42 tumors located in stomach, 24 in small intestine, 18 in other sites. Tumor sizes ranged from 0.5 to 25 cm(average 5.6 cm). Positive rate of CD117 expression determined by immunohistochemical methods was 96.4%. Seventy-nine cases underwent complete tumor resection, while 5 cases received palliative resection or biopsy. Seventy-eight patients were followed up and their 1-, 3-, 5-year survival rates were 92.0%, 79.2%, 72.0% respectively. The Fletcher's classification of malignancy risk groups for GIST was related to the survival rates(P=0.001). The differences of survival rate among very low risk group, low risk group and high-risk group were significant(P=0.003, P=0.000).
  
  
  CONCLUSIONS
  Complete tumor resection in the initial operation of GIST should be emphasized. The Fletcher's classification of malignancy risk groups for GIST is related to the survival rate. Extended surgical resection is required for GIST of higher malignancy risk.
authors: Department of General Surgery, Zhejiang Provincial People's Hospital, Hangzhou 310014, China.
authors: Wei
authors: W
authors: Zhang
authors: Zai-yuan
authors: ZY
authors: Ye
authors: Qin-shu
authors: QS
authors: Shao
authors: Zhong-sheng
authors: ZS
authors: Zhao
authors: Yue-dong
authors: YD
authors: Wang
authors: Xiao-dong
authors: XD
authors: Xu
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D005260:Female; D046152:Gastrointestinal Stromal Tumors / Q000401:mortality / Q000473:pathology* / Q000601:surgery*; D006801:Humans; D008297:Male; D008875:Middle Aged; D012189:Retrospective Studies; D015996:Survival Rate