Are Tumor Markers Used to Screen for Cancer?

Screening is a process during which a cancer can be detected before symptoms are evident. Many researchers believe tumor markers aren't sensitive enough to be used for screening, yet one tumor marker, the prostate-specific antigen (PSA), has been used in the screening of prostate cancer among men for several years and has shown much success. However, an elevated PSA level does not necessarily indicate cancer, but does indicate the need for further testing.

Tumor Markers and Mesothelioma

A test approved last year by the Food and Drug Administration (FDA) is now being used to screen for mesothelioma among individuals at risk for the disease. Because mesothelioma symptoms do not usually surface until after a long latency period, this new test, called Mesomark, could make the difference between life and death for mesothelioma patients.
Mesomark measures the amount of Soluble Mesothelin-Related Peptides (SMRP) in human serum. SMRP is a tumor marker that is produced by mesothelioma cells. This tumor marker may be elevated in mesothelioma patients even in the very early stages of the disease.