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Colorectal cancer: Immunological tests for more accurate detection of cancer precursors
Date:2/5/2009

A large portion of the almost 73,000 colorectal cancers diagnosed in Germany each year could be avoided. If precancerous lesions growths of the intestinal mucosa called adenomas are detected and removed at an early stage, there is a great chance that cancer will not develop at all.

Therefore, statutory health insurances in Germany offer a fecal occult blood test free of charge for all insured persons from the age of 50. This test can detect precursors of colorectal cancer. In addition, persons from the age of 55 are entitled to receive an endoscopic examination of the colon (colonoscopy) once every 10 years.

A colonoscopy identifies precancerous lesions with a certainty of over 90 percent. Nevertheless, due to reluctance to take the examination, only about 30 percent of those entitled to it actually do so (extrapolated to the 10-year period between the two colonoscopies covered by the health insurance). "Therefore, the simple laboratory tests for occult blood in the stool are still important in order to reach those who do not wish to receive a colonoscopy," explains Professor Hermann Brenner, who heads the Division of Clinical Epidemiology and Aging Research at DKFZ.

However, the widely used HaemOccult test which is covered by the health insurances has substantial disadvantages: It is less sensitive and the test result, which is based on enzymatic detection of hemoglobin, can be falsified by the patient's diet such as red meat or vitamin C supplements. By contrast, immunological detection methods are based on a very specific identification of blood components by antibodies.

In order to compare the accuracy of available tests, Brenner's team carried out a large-scale study. The epidemiologists screened stool samples of 1,319 individuals before their scheduled regular screening colonoscopy. All samples were tested with the HaemOccult method as well as with six different immunochemical tests. All methods investigated are
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Contact: Dr. Sibylle Kohlstaedt
s.kohlstaedt@dkfz.de
Helmholtz Association of German Research Centres
Source:Eurekalert

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