Tumor markers - how long to see a change?
Hi all, there have been a lot of posts about tumor markers but I didn't see anything specific to my question. I've been on IV chemo for six weeks (four weeks of chemo, two off) and just had tumor markers drawn because I'm having pain in my rib cage where I have a met or two. Unfortunately I never got baseline tumor markers, but I did get some drawn at a different hospital three weeks before I started chemo. Today's tumor markers were about 70% higher than the tumor markers from back in early August.
I know that tumor markers don't start decreasing immediately when you start treatment, but I'm wondering: those of you who get tumor markers drawn regularly, how long after treatment starts does it typically take for you to see a result? I think it's reasonable that my tumor markers continued to increase after they were drawn in early August before I started treatment, and possibly for at least a few more weeks after I started, but I would love to hear other peoples experience with whether or not I should have expected markers to drop quickly once I started for a Chemo that was working. Thanks in advance!