To Your Good Health
DEAR DR. ROACH: I am 85 and healthy apart from polycythemia vera, for which I take aspirin. I was interested in the new blood test for cancer. Is it worthwhile? — M.N. ANSWER: When screening patients for cancer, the goal is to find a test that leads to a beneficial outcome for the person being screened -- ideally an outcome where they are less likely to die from cancer. These kinds of studies are large, difficult and expensive to do, and we only have this kind of information for a few screening tests, such as mammograms, colon cancer screening, and Pap smears (although there is ...