Why Study Circulating Tumor Cells?

x-posted at Kirby Lab Student Blog Keywords Metastasis: The spreading of the initial (primary) tumor to another site in the body (secondary tumor). Peripheral blood: Blood circulating through arteries, veins, capillaries, etc. Not what’s in your liver, lymphatic system, bone marrow, etc. PSA: Prostate-specific antigen, a protein secreted by the prostate, and elevated in cancer. Measuring PSA levels is a standard clinical tool when assessing prostate cancer, read about the test here.