Claudin 4 Protein Expression in Primary and Metastatic Pancreatic Cancer: Support for Use as a Therapeutic Target

Lynette S. Nichols, Raheela Ashfaq, Christine A. Iacobuzio-Donahue

Research output: Contribution to journalArticle

Abstract

We performed a comprehensive immunohistochemical evaluation of claudin 4 protein expression in paraffin-embedded tissue samples from 72 patients with primary infiltrating pancreatic cancer, 38 patients with metastatic pancreatic cancer, and a panel of normal control tissue samples from various organs. In 11 samples of primary infiltrating pancreatic cancer, foci of pancreatic intraepithelial neoplasia (PanIN) were present and also were analyzed for claudin 4 protein expression. Intense positive claudin 4 immunolabeling was noted within virtually all primary (71/72 [99%]) and metastatic (49/49 [100%]) pancreatic cancer tissue samples analyzed and in 10 of 11 samples of PanIN. In all cases, immunolabeling was noted in a membranous distribution. Claudin 4 protein also was detectable in normal breast, prostate, bladder, and gastrointestinal mucosa, although expression was substantially less intense than that seen in pancreatic cancer tissue samples. Our findings support the use of claudin 4 as a target for novel therapeutics or radioimaging of infiltrating pancreatic cancer. Furthermore, the finding of claudin 4 overexpression within pancreatic intraepithelial neoplasia, the precursor lesion of pancreatic cancer, suggests a potential benefit of imaging claudin 4 before the development of an invasive carcinoma.

Original languageEnglish (US)
Pages (from-to)226-230
Number of pages5
JournalAmerican journal of clinical pathology
Volume121
Issue number2
DOIs
StatePublished - Feb 2004

Keywords

  • Claudin 4
  • Gene expression
  • Pancreatic cancer
  • Tumor marker

ASJC Scopus subject areas

  • Pathology and Forensic Medicine

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