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Penn Medicine researchers identify 4 new genetic risk factors for testicular cancer
Date:5/12/2013

3, and 17q22, none of which have been identified in other cancers. Additionally, these loci pose a higher risk than the vast majority of other loci identified for some common cancers, such as breast and prostate.

This brings the number of genomic regions associated with testicular cancer up to 17including eight new ones reported in another study in this issue of Nature Genetics.

Testicular cancer is relatively rare; however, incidence rates have doubled in the past 40 years. It is also highly heritable. If a man has a father or son with testicular cancer, he has a four-to six-fold higher risk of developing it compared to a man with no family history. That increases to an eight-to 10-fold higher risk if the man has a brother with testicular cancer.

Given this, researchers continue to investigate genetic variants and their association with cancer.

In 2009, Dr. Nathanson and colleagues uncovered variation around two genesKITLG and SPRY4found to be associated with an increased risk of testicular cancer. The two variants were the first striking genetic risk factors found for this disease at the time. Since then, several more variants have been discovered, but only through single GWAS studies.

"This analysis is the first to bring several groups of data together to identify loci associated with disease," said Dr. Nathanson, "and represent the power of combining multiple GWAS to better identify genetic risk factors that failed to reach genome-wide significance in single studies."

The team also explains how the variants associated with increased cancer risk are the same genes associated with chromosomal segregation. The variants are also found near genes important for germ cell development. These data strongly supports the notion that testicular cancer is a disorder of germ cell development and maturation.

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Contact: Steve Graff
stephen.graff@uphs.upenn.edu
215-349-5653
University of Pennsylvania School of Medicine
Source:Eurekalert

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