The U.S. Food and Drug Administration has approved the PSA test along with a digital rectal exam to help detect prostate cancer in men age 50 and older . Doctors often use the PSA test and DRE as prostate cancer screening tests; together, these tests can help doctors detect prostate cancer in men who have no symptoms of the disease. Most men with an elevated PSA test, though, turn out not to have cancer; only 25 to 30 percent of men who have a biopsy due to elevated PSA levels actually have prostate cancer, so researchers are working hard to find new clues. Experts are trying to develop better blood tests that might alert people to malignancies while the cancers are still in their early stages. For example, several new blood tests for ovarian or prostate cancer are under development.At the moment, there is no screening test that is accurate and reliable enough to detect ovarian cancer in the general population. But there are clinical trials going on looking into screening. Until these trials publish their findings, we won't know whether the screening tests work or not. N.B :Screening is looking for cancer before a person has any symptoms. This can help find cancer at an early stage. When abnormal tissue or cancer is found early, it may be easier to treat. By the time symptoms appear, cancer may have begun to spread. source 1:Ovarian cancer screening : Cancer Research UK : CancerHelp UK source 2:Comprehensive Cancer Information - National Cancer Institute
