CEA level from 04/26/10

CEA level from 04/26/10 is 157, the one before that was from 04/13/10 which was 100.9 and the one before that was 100.0.  So my CEA level is rising, it had gotten as low as 29 a few months ago but is again on the rise, at first a few numbers but this last jump is a 56.1 number jump.  I am starting to get worried, not there yet, but starting to get worried that this chemotherapy (Camptosar with Avastin) has already stopped working or the cancer has become immune to it).  I am not worried to panicking yet, but if it continues to climb will definitely speak to my Oncologist about it.