The release of new guidelines on mammography never fails to renew the heated controversy over the potential benefits and harms of this procedure. The latest draft guidelines from the U.S. Preventive Services Task Force (USPSTF) are no exception. Various expert bodies have already taken conflicting positions on them. You can have your say, too, if you hurry — public comment on the draft closes today. Screening mammography is done in healthy women to spot hidden breast cancer. Some expert groups say that women should begin having regular mammograms at age 40, others set the start age at 50. The age at which women should stop having mammograms is also disputed. The USPSTF is an independent panel of experts in primary care and prevention. It is charged with making