My mom is on that combo. Make sure your insurance covers Tarceva the cost w/out insurance is somewhere between $4900-6,000 per month.
Did your doctor mention if you were a candidate for any clinical trials?
We were in a stage 2 trial of Erbitux & Ixabepilone before my mother developed an abcess on her liver and missed too many weeks of the study to continue.
Her CA19-9 dropped almost 90% while we were in the study. She had to go about 6 weeks without treatment; and during that time the cancer seems to have run wild. We are using that Gem/Tarceva combo now; but her CA 19-9 level has only continued to increase quickly.
Every person's response to specific drugs will be different. I'm not certain her exposure to the trial drugs, hasn't affected how her body is responding to the Gem/Tarceva combo.
Gem/Tarceva is a good combo. If you don't feel your responding, getting results that you want - ie stabilizing your cancer, or shrinking the tumors without others growing... keep your options open.
I can also say that the Gem/Tarceva combo has been much less taxing on my mother's body. The most common things she's experienced are dry mouth (keep hard candy around, you will end up wanting something to suck on), tender cuticals, and other minor things (compared to the trial).
Goodluck to you!!