What do circulating tumor cells indicate?
What do circulating tumor cells indicate?
Circulating tumor cell (CTC) count identifies and quantifies the EpCAM protein produced by epithelial tumor cells. Testing should be done prior to the initiation of therapy and serially during treatment. CTC count may also aid in determining prognosis and in assessing treatment efficacy.
What is a normal CTC count?
Our observational data derived from cancer patients suggests a count of less than 3 CTC/ml (0.1-2.9 CTC/ml) to be usually associated with mild risk of malignancy (Stage I), a count of 3-20 CTC/ml with moderate risk (Stage II and III), and >20 CTC/ml with high risk of malignancy (Stage IV), including metastasis.
How accurate is the CTC test?
The high accuracy of the ISET-CTC test combined with the 97% sensitivity and 99% specificity of the PSA-marker presence on prostate cancer cells, suggests an estimated positive predictive value (PPV) of 99% and a negative predictive value (NPV) of 97% for this novel screening test.
How is CTC test done?
Circulating Tumor Cells Assay CTC is checked at three time points –before initiation of therapy, after completion of first cycle & one year later. Defined threshold values for CTC counts for specified cancers such as Breast, Prostate, Colorectal cases, helps to assess disease status even at the baseline CTC count.
How does circulating tumor cells work?
Circulating tumor cells (CTCs) are a rare subset of cells found in the blood of patients with solid tumors, which function as a seed for metastases. Cancer cells metastasize through the bloodstream either as single migratory CTCs or as multicellular groupings—CTC clusters.
Why are circulating tumor cells important?
They are non-invasive, can be used repeatedly, and provide more useful information on metastatic risk, disease progression, and treatment effectiveness. For example, analysis of blood samples from cancer patients has found a propensity for increased CTC detection as the disease progresses.
What is a high CTC count?
N≥6 (more than 6 CTCs per 7.5 ml blood including 6) was defined as high CTC.
What is CTC test?
The CellSearch Circulating Tumor Cell (CTC) test is a simple blood test that helps oncologists in assessing the prognosis of patients with metastatic breast, colorectal, or prostate cancer. The CellSearch test is the only FDA-approved test for CTC assessment.
How are tumor cells detected in blood?
Examples of blood tests used to diagnose cancer include:
- Complete blood count (CBC). This common blood test measures the amount of various types of blood cells in a sample of your blood.
- Blood protein testing.
- Tumor marker tests.
- Circulating tumor cell tests.
How are circulating tumor cells used in maintrac?
Using circulating tumor cells, maintrac ® can monitor not only the therapy itself, but also the subsequent course of disease after completing therapy. In certain circumstances, it can also be beneficial to carry out a counting of circulating cells after finishing treatment as maintrac ® can identify new cancer growth in its early stages.
What are the results of a maintrac test?
The resulting progression of results gives an indication of whether cells are being destroyed by the cancer therapy, i.e. whether the patient is responding to the treatment. Should this not be the case, there is the possibility of testing other substances directly on the circulating tumor cells.
How is maintrac used to treat breast cancer?
It means relapses can be detected early and in an ideal scenario, therapeutic approaches can be adapted in good time. Generally, maintrac® can be used with all tumors of epithelial origin (=carcinomas), with the majority of clinical studies carried out involving breast cancer patients.
Why do you need a maintrac cell count?
Some of these so-called circulating (epithelial) tumor cells (CETCs / CTCs) may be responsible for metastases (metastatic spread) occurring, and thus responsible for further progression of the disease. Using the maintrac® cell count, the extent to which a treatment is proving successful can be monitored.