Those of us lucky enough to have Dr. Camidge as part of our care team have been encouraged to follow these tumor markers. Colin Barton, founder of the ALK Positive Medical Committee, has been doing so since 2018. LabCorp currently tests for these markers as part of my regular blood draws, and insurance pays for it. Presumably other diagnostic and insurance companies will do the same. The four markers are CEA (carcinoembryonic antigen/colorectal cancer), CA125 (ovarian), CA19.9 (pancreatic), and CA27.29 (breast).
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