Abstract
Tumor markers are substances produced in large quantities by cancer cells OR by normal cells in response to the presence of a cancer. They may also be produced in small quantities by normal cells. These substances are usually proteins (enzymes, hormones, DNA, RNA, mRNA, metabolites, receptors, carcinoembryonic proteins, and oncoproteins) or carbohydrates. They may be elevated when there is no cancer (false positive) or may be normal or low when there is a cancer (false negative). They are usually measured in blood, urine, and other body fluids or identified in tumor tissue.
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Bharathan, A., Sitaram, V. (2019). Tumor Markers in GI and HPB Cancers. In: Sahni, P., Pal, S. (eds) GI Surgery Annual. GI Surgery Annual, vol 25. Springer, Singapore. https://doi.org/10.1007/978-981-13-3227-2_5
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