title: Comparative study of the different degrees of risk of gastrointestinal stromal tumor.
abstract: OBJECTIVE
  To evaluate the applicability of the main categories of risk and morphological factors in the prognosis of gastrointestinal stromal tumors.
  
  
  METHODS
  we retrospectively studied fifty-four cases of GIST, assessing the main prognostic factors of this neoplasis: risk levels, topography, size, mitotic index, necrosis, histological subtype and immunophenotype. We also verified their association and the reduction of overall survival.
  
  
  RESULTS
  Univariate analysis showed that tumors with mitoses number greater than 5 per 50CGA (high-power fields), the presence of necrosis and a high risk for both the systems proposed by Fletcher and Miettinen had a significant association with reduced survival (p = 0.00001, 0.0056, 0.03 and 0.009, respectively). The remaining analyzed factors (size, histological subtype, topography and immunophenotype) had no such association. Multivariate analysis (Jacard index) showed that the Miettinen degree of risk was the one that best correlated with prognosis.
  
  
  CONCLUSIONS
  the risk criteria of Fletcher and Miettinen are important in assessing the prognosis of patients with gastrointestinal stromal tumors, especially the latter, which adds to the mitotic index and the presence of tumor necrosis.
authors.affiliation: Department of Pathology and Clinical Support, School of Medicine and Surgery, Universidade Federal do Estado do Rio de Janeiro, Rio de Janeiro, Brazil.
authors.forename: Rodrigo Panno Basilio
authors.initials: RP
authors.lastname: de Oliveira
authors.affiliation: Department of General and Specialized Surgery, School of Medicine and Surgery, UNIRIO, Rio de Janeiro, Brazil.
authors.forename: Pedro Eder
authors.initials: PE
authors.lastname: Portari Filho
authors.affiliation: Hospital Universitário Gaffrée-Guinle, UNIRIO, Rio de Janeiro, Brazil.
authors.forename: Antonio Carlos
authors.initials: AC
authors.lastname: Iglesias
authors.affiliation: Department of Pathology, Pontifícia Universidade Católica do Rio de Janeiro, Rio de Janeiro, Brazil.
authors.forename: Carlos Alberto Basilio
authors.initials: CA
authors.lastname: de Oliveira
authors.affiliation: Department of Pathology, Faculty of Medicine, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil.
authors.forename: Vera Lucia Nunes
authors.initials: VL
authors.lastname: Pannain
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D005260:Female; D046152:Gastrointestinal Stromal Tumors / Q000453:epidemiology* / Q000473:pathology; D006801:Humans; D008297:Male; D008875:Middle Aged; D011379:Prognosis; D012189:Retrospective Studies; D018570:Risk Assessment; D055815:Young Adult