Generally speaking these small bounces around in the normal range for CEA are pretty meaningless. One shouldn't worry until there is sustained trend upwards out of the normal range. People for which CEA is a good marker will find it will move into the teens and 20's maybe even thirties and still nothing show up in CT scans. My wife's Peri mets were difficult to see, but eventually one got large enough to press on her ureter and her bowels enough that it caused a blockage, preventing anything to pass. She couldn't at that point get any nutrition, and wasted away. I think people obsess too much on a marker that might not mean anything in their particular case. My wifes started out at over 110 when diagnosed stage IVb. Chemo brought it down to as low as 2.2, but the Mets were still spreading in her abdomen even thought her spleen and liver mets were shrinking away. The Spleen met disappeared. The Peri Mets didn't produce as large of a CEA signal as the Primary and Liver mets did. I think her last CEA test was in the mid 30's after CT showed the Peri Mets continuing to grow and the clinical trial she was on she failed and was no longer a candidate for it going forward.
So everyone stop obsessing with these little number changes in the normal range. Enjoy your life rather than be miserable, as you never know how long you might have. Enjoy your time together rather than obsessing on what may turn out to be nothing.
DW 53 dx Jun 2013
CT mets Liver Spleen lung. IVb CEA~110
Jul 2013 Sig Resct
8/13 FolFox,Avastin 12Tx mild sfx, Ongoing 5-FU Avastin every 3 wks.
CEA: good marker
7/7/14 CT Can't see the spleen Mets.
8/16/15 CEA Up, CT new abdominal mets. Iri, 5-FU, Avastin every 2 wks.
1/16 Iri, Erbitux and likely Avastin (Trial) CEA going >.
1/17 CEA up again dropped from Trial, Mets growth 4-6 mm in abdomen
5/2/17 Failed second trial, Hospitalized 15 days 5/11. Home Hospice 5/26, at peace 6/4/2017