Because mammography may miss as much as 10% of cancers, it’s still important for women (and men) to examine their breasts monthly for suspicious lumps, moles, or skin blemishes. Remember, 80% of all lumps found are normal breast tissue, benign (non-cancerous) masses. However, if you notice a change in your breast tissue, don’t wait. See your health care provider immediately, even if you have had a negative mammogram in the past. Funny “commercial†for a serious subject as posted on veoh: http://www.dav1d.net/2007/06/17/dont-forget-your-monthly-breast-examination/