I have been doing Gemcitabine and Abraxane since the beginning. I am only doing twice a month now, what my oncologist calls day 1 and day 15. My local oncologist lives by the CA 19-9. Since my scans have been clear, my oncologist at UCSF, where I had my surgery suggested forget the CA19-9 and just go with the scans, same as your surgeon. My problem is that I don’t want it to come back, so I tend to back and forth with the chemo, as my CA 19-9 numbers rise. When I was first diagnosed my CA19-9 was 9700. After three months of chemo it dropped to 150 and then had the whipple surgery.