What is the CELLSEARCH® Circulating Tumor Cell (CTC) Test?

The CELLSEARCH® CTC Test is a simple, actionable blood test that helps oncologists assess the prognosis of patients with metastatic breast, prostate*, or colorectal cancer.


  • The first and only clinically validated, FDA-cleared blood test for enumerating circulating tumor cells (CTCs). CTCs are cancer cells that detach from a primary tumor and travel through the bloodstream or lymphatic system to other parts of the body.

...An actionable test that can help inform clinical decision making

*Metastatic prostate cancer patients were defined as having two consecutive increases in the serum marker prostate-specific antigen above a reference level, despite standard hormonal management. These patients are commonly described as having androgen-independent, hormone-resistant, or castration-resistant prostate cancer. For more information on the intended use and limitations for the CELLSEARCH® Circulating Tumor Cell Test, please refer to the Instructions for Use which can be found at documents.cellsearchctc.com.

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