More ground zero police officers have died from cancer than those who were killed in the actual Sept. 11 attacks. The official number is that 23 NYPD officers lost their lives in the World Trade Center attacks. But 45 officers involved in rescue work have died from cancer since then, and they're not even eligible for federal compensation under the Zadroga 9/11 Health and Compensation fund because doctors have not linked their illnesses to their time spent at ground zero.