Ca-19 and Ca-125 are cancer marker antigens that the physician will check in your blood to see if these counts are elevated. If these counts are elevated then the physician is definatley looking for something along the cancer lines. These levels are also checked during chemo treatments to let the physician know how the chemo is working.
That test is looking for tumor markers, so, yes, they want to test if you might have a pancreatic or colon cancer. But, that shouldn't mean anything since that procedure is used in screening purposes also.