Researchers pinpoint protein 'boss' that controls gene expression. Link to Getty photo from a microscope Will it spread? One protein controls the expression of many genes that dictate whether breast cancer will metastasize. GettyA protein that determines whether breast cancer will spread and become deadly has been found. Researchers say that the protein, which is found inside the nuclei of cells, would be difficult and potentially dangerous to target with drugs. But monitoring for the protein could help patients to know how dangerous their cancer is before it spreads elsewhere, and help them to decide which treatment to chose. Because...