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No screening test is wholly specific, and a high level of tumor marker can still be found in benign tumors. The only tumor marker currently used in screening is PSA (prostate-specific antigen). Diagnostics; Tumor markers alone can't be used for diagnostic purposes, due to lack of sensitivity and specificity. [5]
Reference ranges (reference intervals) for blood tests are sets of values used by a health professional to interpret a set of medical test results from blood samples. Reference ranges for blood tests are studied within the field of clinical chemistry (also known as "clinical biochemistry", "chemical pathology" or "pure blood chemistry"), the ...
The main use of CA19-9 is therefore to see whether a pancreatic tumor is secreting it; if that is the case, then the levels should fall when the tumor is treated, and they may rise again if the disease recurs. [2] Therefore it is useful as a surrogate marker for relapse. In people with pancreatic masses, CA19-9 can be useful in distinguishing ...
Consequently, CEA is usually present at very low levels in the blood of healthy adults (about 2–4 ng/mL). [2] However, the serum levels are raised in some types of cancer, which means that it can be used as a tumor marker in clinical tests. Serum levels can also be elevated in heavy smokers. [3]
Two areas in particular that are receiving attention as surrogate markers include circulating tumor cells (CTCs) [45] [46] and circulating miRNAs. [47] [48] Both these markers are associated with the number of tumor cells present in the blood, and as such, are hoped to provide a surrogate for tumor progression and metastasis. However ...
CA 15-3, for Carcinoma Antigen 15-3, is a tumor marker for many types of cancer, most notably breast cancer. [1] [2] [3]It is derived from MUC1. [4] CA 15-3 and associated CA 27-29 are different epitopes on the same protein antigen product of the breast cancer-associated MUC1 gene.
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