title: Synchronous colorectal adenocarcinoma and gastrointestinal stromal tumor (GIST).
abstract: BACKGROUND
  Little is known about the synchronous occurrence of gastrointestinal stromal tumors (GISTs) and other gastrointestinal tumors. We present two cases of an invasive colon cancer with a synchronous small-bowel GIST; immunohistochemistry studies were performed to evaluate possible genetic similarities.
  
  
  METHODS
  This paper reports two cases of synchronous GISTs and colorectal cancer (CRC) with immunohistochemistry analysis of c-Kit expression. This paper is also a review of the existing literature on the association of GISTs and CRC and the role of c-Kit in CRC.
  
  
  RESULTS
  In the last 2 years, we observed two patients with synchronous CRCs and GISTs of the small bowel. The GISTs were incidentally discovered during the work-up for CRCs and excised at the time of the colon resection. Immunohistochemistry study did not reveal an expression of c-Kit in CRCs. Clinical implications of the association between these two neoplasms are described in this paper.
  
  
  CONCLUSIONS
  Synchronous CRC and GIST has been more frequently reported. Because of the limited number of cases, we cannot exclude an incidental relationship. The genetic pathways of tumorigenesis appear different for the two neoplasms. Further studies are needed to clarify a possible role of c-Kit in the development of colonic adenocarcinomas.
authors.affiliation: Department of Surgery, University of Chicago Hospitals, 5841 S. Maryland Avenue, Chicago, IL 60637, USA.
authors.forename: Marcovalerio
authors.initials: M
authors.lastname: Melis
authors.forename: Eugene A
authors.initials: EA
authors.lastname: Choi
authors.forename: Robert
authors.initials: R
authors.lastname: Anders
authors.forename: Peter
authors.initials: P
authors.lastname: Christiansen
authors.forename: Alessandro
authors.initials: A
authors.lastname: Fichera
mesh_terms: D000230:Adenocarcinoma / Q000235:genetics*; D000368:Aged; D000369:Aged, 80 and over; D015179:Colorectal Neoplasms / Q000235:genetics*; D005260:Female; D046152:Gastrointestinal Stromal Tumors / Q000235:genetics*; D006801:Humans; D007580:Jejunal Neoplasms / Q000235:genetics*; D009378:Neoplasms, Multiple Primary / Q000235:genetics*; D019009:Proto-Oncogene Proteins c-kit / Q000096:biosynthesis / Q000235:genetics
chemical_list: D019009:Proto-Oncogene Proteins c-kit