Staging is a method of describing a cancer. It illustrates where the cancer is located, where it has spread and what part of the body’s organ it affects. Doctors apply diagnostic tests to verify the cancer's stage. It is based on the results of the physical exam, biopsies, and imaging tests (CT scan, PET scan, etc.).Therefore, staging may not be comprehensive until all the tests are completed. Determining the stage helps the doctor to make a decision on what kind of treatment is best to cur...