The New York Post reported Sunday that the number of cancer cases among 9/11 first respondents had more than doubled in the past year, from 1,140 to over 2,500. However, to scientists who specialize in analyzing such data, the number of cases cannot ever tell the full story. Dr. Roberto Lucchini is an epidemiologist and director of the World Trade Center Health Program Data Center at Mount Sinai Hospital, which treats and researches the police officers, construction workers, sanitation workers and iron workers who were among the first respondents on 9/11.