Gene expression profiling identifies markers of ampullary adenocarcinoma.

Abstract

Ampullary adenocarcinoma is an aggressive cancer with a poor prognosis. Without surgical resection, ampullary adenocarcinomas can be difficult to distinguish from ampullary adenomas. The aim of this study was to identify differentially expressed genes in ampullary adenocarcinoma in order to identify candidate markers of the disease. The Affymetrix Human Genome U133 GeneChip set (HG-U133A and HG-U133B) was used to obtain gene expression profiles of 5 ampullary adenocarcinomas and 10 normal duodenal samples. Using fold change analysis we identified 235 fragments expressed at least fivefold higher in ampullary cancers than in normal duodenum. The expression profiles of eight candidate overexpressed genes (osteopontin, mesothelin, tissue inhibitor of metalloproteinases 1, mucin-1, mucin-5, fascin, heat shock protein 47, fibronectin 1) were confirmed by immunohistochemistry or in situ hybridization on tissue microarrays (TMA) containing 54 ampullary adenocarcinomas. One of these genes, osteopontin, was expressed 27-fold higher levels in ampullary adenocarcinomas compared to normal duodenum by genechip analysis. We therefore determined serum osteopontin levels in patients with ampullary neoplasms, patients with other periampullary diseases and in normal controls. Mean preoperative serum osteopontin levels as measured by competitive ELISA were 906 +/- 268 ng/ml in patients with ampullary cancer, 867 +/- 160 ng/ml in patients with an ampullary adenoma, 327.1 +/- 195.6 ng/ml in patients with nonmalignant periampullary diseases and 204 +/- 65 ng/ml in age-matched healthy controls (p < 0.001). Measurement of markers of ampullary cancer such as osteopontin may aid in the early detection and differential diagnosis of patients with periampullary lesions.

• Authors: N Tjarda Van Heek, Anirban Maitra, Jens Koopmann, Neil Fedarko, Alka Jain, Ayman Rahman, Christine A Iacobuzio-Donahue, Volkan Adsay, Raheela Ashfaq, Charles J Yeo, John L Cameron, Johan A Offerhaus, Ralph H Hruban, Karin D Berg, Michael Goggins
• Journal: Cancer biology & therapy (Cancer Biol Ther) Vol. 3 Issue 7 Pg. 651-6 (Jul 2004) ISSN: 1538-4047 [Print] United States
• PMID: 15136764 (Publication Type: Comparative Study, Journal Article, Research Support, Non-U.S. Gov't, Research Support, U.S. Gov't, P.H.S.)

Chemical References

• Biomarkers, Tumor
• SPP1 protein, human
• Sialoglycoproteins
• Osteopontin

Topics

• Adenocarcinoma (diagnosis, genetics, metabolism)
• Ampulla of Vater (surgery)
• Biomarkers, Tumor (metabolism)
• Carcinoma, Pancreatic Ductal (diagnosis, genetics, metabolism)
• Case-Control Studies
• Common Bile Duct Neoplasms (diagnosis, genetics, metabolism)
• Duodenum (metabolism)
• Gene Expression Profiling
• Gene Expression Regulation, Neoplastic
• Humans
• Immunoenzyme Techniques
• In Situ Hybridization
• Oligonucleotide Array Sequence Analysis
• Osteopontin
• Pancreatic Neoplasms (diagnosis, genetics, metabolism)
• Pancreaticoduodenectomy
• Sialoglycoproteins (metabolism)