When staging cancer, a LOWER number indicates a less severe and less invasive cancer and a HIGHER number indicates a more severe and more invasive cancer.
What do cancer antigen numbers mean?
- A cancer antigen number is also called a tumor marker. It is a number that indicates the amount of cancer antigen in the body. A cancer antigen is a protein made by cancer cells. Different types of cancer can make different types of antigens
- Normal range: < 2.5 ng/ml. Normal range may vary somewhat depending on the brand of assay used. Levels > 10 ng/ml suggest extensive disease and levels > 20 ng/ml suggest metastatic disease
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