In a move that could lead to significant changes in medical care for older men, a national task force on Monday recommended that doctors stop screening men ages 75 and older for prostate cancer because the search for the disease in this group was causing more harm than good. The guidelines, issued by the U.S. Preventive Services Task Force, represent an abrupt policy change by an influential panel that had withheld any advice regarding screening for prostate cancer, citing a lack of reliable evidence. Though the task force still has not taken a stand on the value of screening in...