The Gemzar and Tarceva didn't work for me either. My Doctor then started me on 5FU and leukovarin and it slowed the growth of the tumors. Something to consider.
As for the cancer markers, my doctor doesn't mention them unless I ask. But at one point mine was in the 6000 range and after the 5FU treatments it was down to about 400.
If your doctor is not willing to try something else I would suggest you see another oncologist.