A new diagnosis of cancer can be a shock, making you feel out of control and overwhelmed. Getting informed can help alleviate these feelings. Cancer is not one disease, but many diseases that occur in different areas of the body. Each type of cancer is characterized by the uncontrolled growth of cells. Choice of cancer treatment is influenced by several factors, including the specific characteristics of your cancer; your overall condition; and whether the goal of treatment is to cure your cancer, keep your cancer from spreading, or to relieve the symptoms caused by cancer. Clinical trials are studies that evaluate the effectiveness of new drugs or treatment strategies. The development of more effective cancer treatments requires that new and innovative therapies be evaluated with cancer patients. The testing center is an overview of the tests related to detecting, diagnosing and monitoring cancer. There are two main types of tests used for these purposes: screening tests and diagnostic tests.