Proving cancer cluster at Cincinnati Police District Five could be challenging, expert says

Nearly a year after a union president publicly linked cancer cases to Cincinnati Police District Five headquarters, investigators will try to figure out if his suspicions are true. An expert from the University of Cincinnati thinks it could be a tough case to make. Last week, the city of Cincinnati's Risk Management Division asked the National Institute for Occupational Safety and Health to look at whether District Five is connected to a "cancer cluster." That's a term used to describe "a greater than expected number of cancer cases among a group of people in a defined geographic area over a specific time period," according to the National Cancer Institute.