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New staging technique might save bladders in some bladder cancer patients
Date:3/9/2009

MAYWOOD, Ill. -- Pathologists today (March 9, 2009) reported encouraging results from a new technique to increase the accuracy of staging bladder cancer tumors that could reduce the need to remove bladders from some patients.

The technique is performed by pathologists before surgery. It can confirm that in certain cases, tumors are at an early enough stage so that the cancer can be treated without removing the bladder.

In a study of 70 bladder cancer specimens, the technique was 95.2 percent accurate, Dr. Gladell Paner of Loyola University Health System reported at a meeting of the United States and Canadian Academy of Pathology annual meeting in Boston.

The American Cancer Society estimates there were about 69,000 new cases of bladder cancer in the United States last year, and about 14,000 people died of the disease.

There are five stages of bladder cancer, ranging from Stage 0 (earliest) to Stage 4 (most advanced). Stage 0 and Stage 1 cancers generally do not require removal of the bladder. Stage 2 and above typically require removal of part of or the entire bladder.

In Stage 0 and Stage 1, the tumor is confined to the surface of the bladder, or just below the surface. In Stage 2, the tumor has penetrated down to a deep muscle layer. But in some cases, Stage 2 cancer can look like Stage 1. The reason is that a layer of muscle near the surface can look like the deep muscle layer. Such a mistake can result in the bladder being needlessly removed. In as many as 4 percent of biopsies, it is extremely difficult to distinguish between Stage 1 and Stage 2 cancer, Paner said.

In the new technique, developed by Paner, the specimen is exposed to an antibody called smoothelin. Smoothelin reacts strongly with deep muscle, and this reaction shows up as a stain when seen under the microscope. By contrast, smoothelin does not react or leave stains on muscle near the surface.

"The goal is to avoid the potentia
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Contact: Jim Ritter
jritter@lumc.edu
708-216-2445
Loyola University Health System
Source:Eurekalert

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