This undated image provided by the U.S. National Cancer Institute shows the 46 human chromosomes, where DNA resides and does its work. Each chromosome contains genes, but genes comprise only 2 percent of DNA. On Wednesday, Sept. 5, 2012, 500 scientists around the world reported their findings on the complex functions occurring in the rest of DNA, much of it involved in regulating genetic activity. (AP Photo/National Cancer Institute)
Photo by Associated Press /Chattanooga Times Free Press .
published Monday, September 24th, 2012
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Scientists reported Sunday that they have completed a major analysis of the genetics of breast cancer, finding four major classes of the disease. They hope their work will lead to more effective treatments, perhaps with some drugs already in use.