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Most US doctors baffled by cancer screening stats

Most U.S. doctors fail to grasp simple statistics about cancer screening, which could boost their enthusiasm for unproven and potentially harmful tests, a new poll suggests. For instance, three-quarters of the more than 400 doctors surveyed believed better survival rates prove screening is a lifesaver although that’s not the case, researchers say. And nearly half thought early detection translates into saving lives — another common misperception.