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New test improves detection of bladder cancer

Testing for a certain protein in urine was found to increase the accuracy for diagnosis of bladder cancer, according to a study in the February 16 issue of JAMA, a theme issue on medical applications of biotechnology.

Bladder cancer is the fifth most common malignancy in the United States, according to background information in the article. Early detection improves prognosis, treatment options, and quality of life. Although the 5-year survival rate is 95 percent when tumors are detected while they are confined to the mucosa (membrane), up to 25 percent of the approximately 60,000 bladder tumors predicted to be diagnosed this year will be detected after they have become invasive or metastatic, which lowers 5-year survival to approximately 48 percent and 10 percent, respectively. As a result, 13,000 Americans will die of bladder cancer this year.

A combination of methods is used for diagnosis of bladder cancer because no single procedure detects all malignancies. Urine tests are frequently part of an evaluation, but have either been nonspecific for cancer or required specialized analysis at a laboratory.

H. Barton Grossman, M.D., of M.D. Anderson Cancer Center, Houston, and colleagues investigated whether a new, point-of-care, noninvasive urine-based test for the protein NMP22 proteomic marker could improve detection of bladder cancer. The researchers compared the ability of this test to detect cancer with that of urine cytology (cells), which must be analyzed in a clinical laboratory. The study included 23 academic, private practice, and veterans' facilities in 10 states which enrolled 1,331 patients at elevated risk for bladder cancer (history of smoking and certain symptoms) from September 2001 to May 2002. Patients at risk for malignancy of the urinary tract provided a urine sample for analysis of NMP22 protein and cytology prior to cystoscopy (visual examination of the bladder using a special instrument that is passed through the urethr
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Contact: Stephanie Dedeaux
713-792-0655
JAMA and Archives Journals
15-Feb-2005


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