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Blood clotting and bowel cancer risk
Date:6/6/2011

Back in the mid 19th century, a French doctor, Armand Trousseau, discovered a connection between cancer and thrombosis the formation of often dangerous blood clots that can lead to venous occlusion. Today it is known that cancer and its treatment change blood flow properties and thus promote the formation of clots. However, clots do not only occur as a side effect and consequence of cancer, but, vice versa, an increased blood clotting tendency may also be associated with an elevated cancer risk.

About twelve different blood proteins called clotting factors interact in a coordinated manner in the blood clotting (coagulation) process. In the same way as hemophilia (decreased blood clotting) is inherited, genes also play a role in an increased clotting tendency (thrombophilia): There are well studied gene variants (polymorphisms) of a number of clotting factors which are associated with an increased or decreased clotting tendency. Between two and five percent of the population carry such genetic variants.

At the German Cancer Research Center (Deutsches Krebsforschungszentrum, DKFZ) in Heidelberg, scientists headed by Professor Dr. Hermann Brenner have been studying six gene variants of different clotting factors for a possible connection with colorectal cancer risk. In a large study, they analyzed the occurrence of these six variants in approximately 1.800 colorectal cancer patients and in the same number of healthy control persons.

The team found the most obvious connection for a variant that substantially increases the risk of thrombosis and which is known as factor V Leiden (FVL). Study participants who carry this genetic variant on both copies of their chromosome 1 were found to have a six fold increase in colorectal cancer risk compared to participants who carry two copies of the "standard variant" of factor V. If only one copy of chromosome 1 had the FVL variant, bowel cancer risk was not elevated.

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Contact: Dr. Sibylle Kohlstdt
s.kohlstaedt@dkfz.de
Helmholtz Association of German Research Centres
Source:Eurekalert

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