Last year an influential federal task force said routine annual mammograms were not necessary for women in their 40's. That led to concerns about insurance companies rationing medical services. Now a new study of 40,000 women diagnosed with breast cancer in Norway between 1986 and 2005 says treatment has advanced so much that mammograms may, indeed, not be so important. Sharon Begley is science editor of Newsweek magazine.
KCRW
