Healthy breast cells produce the immune protein interleukin-25 which locks onto nearby cells with the receptor for it. This initiates a self-destruct in the cell. Normal cells do not have this receptor but 19% of cancer cells have been found to, including more aggressive ones.
http://www.newscientist.com/blogs/shortsharpscience/2011/04/healthy-breast-cells-police-fo.html
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