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Don't forget another marker - the CEA, or Carcinoembryonic Antigen test.
My onc runs that as well as CA 27.29 as it is a better indicator (stays more stable) when there is something else upsetting my CA 27.29.
I have both markers checked as part of my complete blood work every three weeks when I go in for my Herceptin/Zometa infusions.
(We also do this since my liver mets came so fast and furious that he does not want me even 1 month off the "radar screen.")
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