SAN FRANCISCO (EGMN) - Only 21% of Massachusetts women older than age 40 years were not in mammographic screening programs. Yet unscreened women accounted for 75% of breast cancer deaths in an analysis of data on 6,997 invasive breast cancers diagnosed in 1990-1999 and followed through 2007."The most effective method for women to avoid death from breast cancer is to have regular mammographic screening," Dr. Blake Cady said at a breast cancer symposium sponsored by the American Society of Clinical...