Which other tumor marker tests are performed with serum CA 27-29 testing?

Updated: Jul 11, 2019
  • Author: Nikhil G Thaker, MD; Chief Editor: Eric B Staros, MD  more...
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Consideration may be given to ordering multiple tumor markers because of the heterogeneity in cell composition of each tumor. Other tumor markers to follow breast cancer include CEA, CA 15-3, HER2 extracellular domain, and CA 125. [6]

CA 27-29 measures an overlapping antigen as the cancer antigen 15-3 (CA 15-3) assay. One or the other tumor marker is ordered, typically not both.

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