As with many cancers, screening is a crucial step in preventing colorectal cancer. In fact, colorectal cancer is one of the most treatable forms of cancer if it is found early. “There are many different ways we can prevent colorectal cancer, ranging from medical tests to dietary and lifestyle behaviors, to taking certain medications,” says Kimmie Ng, MD, MPH, director of clinical research for Dana-Farber’s Gastrointestinal Cancer Center. “But if I had to come down on one, important factor...