What should doctors and patients know about screening for these five cancers? When you go to the the doctor's office due to an ongoing problem, your doctor might order several tests in order to rule out the possibilities of what's causing your illness. You may also be at the age where your doctor wants to begin screening certain body parts to see if you have any signs of cancer.Unfortunately, you may be getting tests that you don't really need, which could be putting your health at further risk.What are the five cancer screenings that are most important? Breast cancer Colorectal cancer Cervical cancer Prostate cancer Ovarian cancer Wayne J. Riley, MD, MPH, shares the five cancer screenings that are most important and when you should be getting them.