Human breast cancer tumors that grow after being grafted into mice are usually those that are likely to metastasize, or spread in the body, leading to lowered rates of survival, according to research at the University of Utah. This simple procedure might lead to a test to determine which cancers are the most aggressive; this can be especially important in evaluating which cases of triple-negative need aggressive therapy. The full research is in Genetic Engineering & Biotechnology News.

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