(rÄâ²dÃ¤r) 1. A method of detecting distant objects and determining their position, speed, or other characteristics by causing radio waves to be reflected from them and analyzing the reflected waves. The waves can be converted into images, as for use on weather maps.
A high level of the marker may indicate a worsened prognosis in some situations. The most effective and common purpose of tumor markers is to monitor the cancer treatment. As the cancer levels go on decreasing in the body, the marker also goes down. If the marker remains stagnant or increases, it is usually an indication that the patient is not responding sufficiently to the treatment.
A second word of caution. There are a small number of people whose pancreatic cancers do not shed the Ca 19-9 substance. Their tumor marker test for Ca 19-9 will always come back low, irregardless of whether the cancer is growing or gone.here are a small number of people whose pancreatic cancers do not shed the Ca 19-9 substance. Their tumor marker test for Ca 19-9 will always come back low, irregardless of whether the cancer is growing or gone.