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Study identifies novel genomic changes in the most common type of lung cancer
Date:7/9/2014

Researchers from The Cancer Genome Atlas (TCGA) Research Network have identified novel mutations in a well-known cancer-causing pathway in lung adenocarcinoma, the most common subtype of lung cancer. Knowledge of these genomic changes may expand the number of possible therapeutic targets for this disease and potentially identify a greater number of patients with treatable mutations because many potent cancer drugs that target these mutations already exist.

TCGA is jointly funded and managed by the National Cancer Institute (NCI) and the National Human Genome Research Institute (NHGRI), both part of the National Institutes of Health. A TCGA analysis of another, less common, form of lung cancer, squamous cell carcinoma, was reported in 2012.

In this new study, published online July 9, 2014, in the journal Nature, researchers examined the genomes, RNA, and some protein from 230 lung adenocarcinoma samples. In three-quarters of the samples, the scientists ultimately identified mutations that put a cell signaling pathway known as the RTK/RAS/RAF pathway into overdrive.

"The integrated nature of TCGA analysis made these findings and their potential therapeutic implications possible," said NIH Director Francis S. Collins, M.D., Ph.D. "We hope this lays the groundwork for future work in precision medicine."

Mutations affecting the RTK/RAS/RAF pathway can cause it to become stuck in the "on" state. As a result, signals that promote cancer cell proliferation and survival are produced continuously. However, some drugs currently available curb aberrant activity of this pathway and prompt therapeutic responses in patients.

"Combined with the earlier TCGA analysis of squamous lung cancers, we now have a comprehensive understanding of many of the genetic pathways that lead to cancers of the lung," said NCI Director Harold Varmus, M.D. "Based on this knowledge, we can now seek better pathway inhibitors to improve patient outc
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Contact: Press Office
ncipressofficers@mail.nih.gov
301-496-6641
NIH/National Cancer Institute
Source:Eurekalert

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