title: Epidermal growth factor receptor expression in pancreatic carcinoma using tissue microarray technique.
abstract: BACKGROUND
  The effect of overexpression of epidermal growth factor receptor (EGFR) in pancreatic carcinoma is not clear. Utilizing tissue microarrays, we evaluated EGFR expression in pancreatic cancer to determine the association of EGFR expression with histopathologic characteristics and patient outcome.
  
  
  METHODS
  71 cases of pancreatic adenocarcinoma and 18 cases of chronic pancreatitis were retrieved from archival files. Tissue cores from donor blocks were arrayed to create a tissue microarray. Sections were stained with EGFR and the intensity of membranous staining and percentage of tumor cells showing immunoreactivity were determined. At least 1% membranous staining and 1+ intensity were considered positive.
  
  
  RESULTS
  EGFR was present in 49 of 71 (69%) cases of pancreatic adenocarcinoma and 7 of 18 (39%) cases of chronic pancreatitis (p = 0.03). There was no statistically significant correlation between intensity or extent of EGFR expression and tumor grade, size, or lymph node status. While median survival was nearly twice as long when EGFR was expressed (15.2 vs. 8.3 months), this did not reach statistical significance.
  
  
  CONCLUSIONS
  EGFR is overexpressed in pancreatic cancers independent of histopathologic characteristics and does not predict survival. Immunohistochemical analysis of EGFR staining may help in identifying candidates for EGFR inhibitor therapy.
authors.affiliation: Department of Pathology, The Ohio State University, Columbus, Ohio, USA.
authors.forename: Mark
authors.initials: M
authors.lastname: Bloomston
authors.forename: Atul
authors.initials: A
authors.lastname: Bhardwaj
authors.forename: E Christopher
authors.initials: EC
authors.lastname: Ellison
authors.forename: Wendy L
authors.initials: WL
authors.lastname: Frankel
mesh_terms: D000230:Adenocarcinoma / Q000378:metabolism* / Q000401:mortality / Q000473:pathology; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D066246:ErbB Receptors / Q000378:metabolism*; D005260:Female; D006801:Humans; D007150:Immunohistochemistry; D008297:Male; D008875:Middle Aged; D010190:Pancreatic Neoplasms / Q000378:metabolism* / Q000401:mortality / Q000473:pathology; D050500:Pancreatitis, Chronic / Q000378:metabolism; D011379:Prognosis; D015996:Survival Rate; D046888:Tissue Array Analysis
chemical_list: D066246:ErbB Receptors