In an analysis of more than 3,500 tumor samples of 12 cancer types, researchers found that classifying tumors based on their molecular characteristics, rather than the tissue in which they originated, led to the reclassification of at least 1 in 10 cancer cases. The findings, published in the journal Cell, challenge the existing cancer classification system and offer "a massive new data resource for further exploration as well as a comprehensive list of the molecular features distinguishing each of the newly described cancer classes," study author Chris Benz said.

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