Oncomarkers are present in the human body as substances originated due to arise and development of a malignant process. At present oncomarkers with an ideal specification and sensitivity do not exist and it is possible to find higher oncomarker levels also in healthy people. For clinical praxis it is very important not to use them as screening parameters. They are important for monitoring during the disease. General use of oncomarkers is not allowed due to the limitations from health insurance companies.