Washington: A large-scale analysis of the association between DNA viruses and human malignancies show that that many of the most common cancers are not associated with DNA viruses.For years scientists believed viruses played a role in the development of maybe 10 to 20 percent of cancers.In 2011, scientists at the Karolinska Institute in Sweden identified potential viral links to several cancers not previously associated with viruses, including brain tumors and prostate cancer , suggesting the real number could be as high as 40 percent.Since then, researchers have been working hard to find more associations, in part because viruses could provide targets for vaccines to prevent or cure these cancers.To better understand the role of DNA viruses in human cancers, researchers from the MD Anderson Cancer Center in Houston sequenced RNA from 3775 malignant tumor samples from The Cancer Genome Atlas and then applied a robust bioinformatics algorithm to survey them for the presence of viral transcripts.
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