The American Cancer Society estimates that about 20 percent of cancer cases are preventable. A key element to early detection is screenings, which can help doctors find and treat several types of cancer early before symptoms begin. Early detection is vital because when abnormal tissue or cancer is found early, it may be easier to treat as well as prevent the spread of cancer.  In this segment of Health Matters, cancer nurse navigators Tara Barker, registered nurse, and Nicole Haines, registered nurse, of Mercy Medical Center talk about various cancer screenings with the experts.