Study shows how radiation (mammograms to CT scans) causes breast cancer http://www.naturalnews.com/028959_radiation_brst_cancer.html

"Our work shows that radiation can change the microenvironment of breast cells, and this in turn can allow the growth of abnormal cells with a long-lived phenotype that have a much greater potential to be cancerous," Paul Yaswen, a cell biologist and breast cancer research specialist with Berkeley Lab's Life Sciences Division, said in a statement to the press.