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Radiation pharmacogenomics identifies biomarkers that could personalize cancer treatment
Date:10/4/2010

October 5, 2010 Radiation therapy is used to treat more than half of all cancer cases, but patient response to therapy can vary greatly. Genetics is increasingly being recognized as a significant contributor to inter-individual response to radiation, but the biology underlying response remains poorly understood. In a study published online today in Genome Research (www.genome.org), researchers employed a pharmacogenomics approach to find biomarkers associated with radiation response that could help to more effectively tailor individual cancer treatments in the future.

Response to radiation treatment can range from complete eradication of the tumor to severe adverse reactions in normal tissues that complicate a patient's recovery. Several clinical factors, such as radiation dose and fraction, are known to influence radiation response, but it has recently been estimated that genetic factors may explain nearly 80% of the inter-individual variation of radiation response in normal tissue. If genetic variants and biological mechanisms contributing to radiation response are identified, more personalized treatment strategies could be employed in the clinic.

In this study, researchers led by Liewei Wang of the Mayo Clinic performed a genome-wide association study on 277 ethnically defined human lymphoblastoid cell lines (LCLs) to identify biomarkers for radiation response. Previous studies have found that genetic variation significantly influences gene expression following radiation treatment, however a possible relationship of basal gene expression with radiation response has not been extensively studied until now, and could be key to predicting response. The group integrated several lines of data from the LCLs, including 1.3 million single nucleotide polymorphisms (SNPs), genome-wide gene expression data, and ionizing radiation cytotoxicity phenotypes.

By looking for SNPs and gene expression
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Contact: Peggy Calicchia
calicchi@cshl.edu
516-422-4012
Cold Spring Harbor Laboratory
Source:Eurekalert

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