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Date:2/11/2013

While prostate cancer is the most common cancer in elderly Western men it also, but more rarely, strikes patients aged between 35 and 50. Scientists at the European Molecular Biology Laboratory (EMBL) in Heidelberg, Germany, in collaboration with several other research teams in Germany*, have discovered that such early-onset prostate cancers are triggered by a different mechanism from that which causes the disease at a later age. Their findings are published today in Cancer Cell, and might have important consequences for the diagnosis and treatment of prostate cancer in younger patients.

The researchers compared the genomes of 11 early-onset tumours with 7 late-onset tumours and observed marked differences at the molecular level. The genomes of early-onset prostate tumours undergo a relatively small number of changes compared to tumours that develop in older patients.

However, this small number of events leads to crucial exchanges of DNA between chromosomes, causing genes that are normally independent to become tightly linked (known as 'fusion genes'). Many of the genes affected by these rearrangements are usually activated by androgen hormones, such as testosterone. Through these rearrangements they become connected to cancer genes, resulting in fusion genes that can be activated by androgen hormones, so that otherwise inactive genes with the potential to cause cancer are now switched on.

"Prostate cancer in young patients appears to be specifically triggered by androgens and to involve genetic alterations that distinguish this cancer from prostate tumours in older patients," explains Jan Korbel, who led the study at EMBL. "We also measured the levels of androgen receptors in a large cohort of patients from Hamburg, and found data consistent with our initial genomic analysis."

Younger patients with prostate cancer tend to have higher levels of androgen hormone receptors than older patients with the same disease. This cou
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Contact: Isabelle Kling
isabelle.kling@embl.de
49-622-138-78355
European Molecular Biology Laboratory
Source:Eurekalert

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