Thank you very helpful. I had Whipple in Feb.2024 with a ca19-9 of 1045.After surgery it went down to 88. I had 8 treatments of chemo from Sept. to Dec 11, 2024. Off chemo for about 7 months and now have ca19-9 of 940. Had a pet scan last week showed no tumor. My surgeon says no need for chemo. I'm worried about the ca19-9. The onco says I should go back to chemo .Have not decided what to do. Any ideas/ thoughts would be greatly appreciated.