This spring, the American Cancer Society is kicking off a massive project to sign up, track and study 300,000 adults for decades, in hopes of curing various types of cancer. It's not the first time the society has undertaken this. Cancer Prevention Study-3 (CPS-3) follows CPS-1 and CPS-2, and the results of the first two programs served to advance cancer knowledge and treatment by leaps and bounds. The Milwaukee goal for CPS-3 is 2,000 people.