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New research finds markers for esophageal cancer before it develops
Date:11/3/2008

PROVIDENCE, RI Rhode Island Hospital researchers have identified genetic proteins, also known as biomarkers, capable of distinguishing changes at the microscopic level that can signal a precancerous condition in the esophagus. These markers may help identify patients who are likely to progress to esophageal cancer. This first of its kind study is published in the journal Clinical Cancer Research.

Barrett's esophagus (BE) is a common precancerous condition of the lower esophagus. Patients with BE need to be screened by endoscopy and biopsied at frequent intervals in order to detect premalignant changes at the microscopic level. The presence of BE increases the risk of developing esophageal adenocarcinoma (EAC), the most common form of esophageal cancer.

Lead author Murray Resnick, MD, comments, "Identification of biomarkers capable of distinguishing the grade of Barrett's esophagus-associated dysplasia, as well as identifying patients who are most likely to progress to cancer, would be extremely valuable tools for both surgical pathologists and gastroentorologists."

The progression of BE to EAC occurs in a series of steps from low-grade dysplasia (earliest morphological sign of precancer) to high-grade dysplasia (HGD). Approximately half of all patients who experience HGD will progress to EAC. Several genetic abnormalities have been identified that support the transition from HGD to EAC. Currently morphological analysis of esophageal biopsies by light microscopy is considered the gold standard for identifying HGD, thereby guiding a treatment plan for these patients. Distinguishing between LGD and HGD, however, can be challenging for pathologists to detect using light microscopy alone.

Resnick says, "As pathologists, our primary goal was to identify candidate biomarker proteins suitable for the generation of specific antibodies that could detect these proteins using immunohistochemical diagnostic techniques that are
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Contact: Nancy Cawley
ncawley@lifespan.org
Lifespan
Source:Eurekalert

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