More than 5,400 Ground Zero responders and others who lived, worked or went to school near the fallen Twin Towers have come down with 9/11-linked cancers, a grim tally that has tripled in the past 2¹/₂ years. As of June 30, 5,441 people enrolled in the WTC Health Program have been diagnosed with 6,378 separate cancers, with some struck by more than one type, officials said. More.