title: [Expression of p53 and BCI-2 as prognostic markers and for anatomical location in gastrointestinal stromal tumors (GIST). Clinico-pathological and immunohistochemistry study of 19 cases].
abstract: OBJECTIVE
  To correlate the expression of p53 and BCl-2 with the clinical outcome and anatomic location of the gastrointestinal stromal tumours (GIST).
  
  
  BACKGROUND
  The GIST are the most common nonepithelial neoplasm of the gastrointestinal tract. In spite of the existence of a wide range of predictive factors, their clinical outcome is unpredictable. There are several studies that correlate the expression of p53 and Bcl-2 with the clinical outcome and anatomic location of the GIST.
  
  
  METHODS
  We obtained 19 cases from the archives of the Department of Pathology of the ABC Medical Center, in Mexico City. GIST were classified into risk groups according to the Fletcher et al. classification. We performed an immunohistochemestry panel including CD117, CD34, actin, desmin, P-S100, p53 and BCl-2 and correlated their expression to the risk group and anatomical site of the tumors.
  
  
  RESULTS
  There was less expression of p53 in the gastric tumors (27%) than in small bowel tumors (100%). There was greater expression of p53 in the high-risk tumors than in the very low-risk ones, regardless of the anatomical site. Bcl-2 expression was more expressed in the small intestine tumors (100%) than in those located in the duodenum (50%) The high risk tumors showed slightly more expression of Bcl-2 than the low risk ones (89% vs. 100%), despite the anatomical location.
  
  
  CONCLUSIONS
  Both, p53 and Bcl-2 are important markers to establish the anatomical site of GIST and are also helpful to predict the clinical behavior of these tumors.
authors.affiliation: Departamento de Patología, Centro Médico ABC. México, D.F.
authors.forename: Nayeli
authors.initials: N
authors.lastname: Martínez-Consuegra
authors.forename: Javier
authors.initials: J
authors.lastname: Baquera-Heredia
authors.forename: Beatriz
authors.initials: B
authors.lastname: de León-Bojorge
authors.forename: Alvaro
authors.initials: A
authors.lastname: Padilla-Rodríguez
authors.forename: Carlos Ortiz
authors.initials: CO
authors.lastname: Hidalgo
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D005260:Female; D046152:Gastrointestinal Stromal Tumors / Q000378:metabolism* / Q000473:pathology*; D020662:Guanine Nucleotide Exchange Factors / Q000096:biosynthesis*; D006801:Humans; D007150:Immunohistochemistry; D007414:Intestinal Neoplasms / Q000378:metabolism* / Q000473:pathology*; D008297:Male; D008875:Middle Aged; D011379:Prognosis; D019253:Proto-Oncogene Proteins c-bcl-2 / Q000096:biosynthesis*; D013274:Stomach Neoplasms / Q000378:metabolism* / Q000473:pathology*; D044767:Ubiquitin-Protein Ligases
chemical_list: D020662:Guanine Nucleotide Exchange Factors; D019253:Proto-Oncogene Proteins c-bcl-2; C102169:HERC1 protein, human; D044767:Ubiquitin-Protein Ligases