Circulating tumor cells are tumor cells that have shed from primary tumor and circulated to the different part of the body through lymphatic system and blood circulation system. Circulating tumor cells are useful for the detection of the cancer and to understand the disease progression and projection of treatment required for tumor elimination. Moreover various tumor markers can also be used with circulating tumor cells for the diagnosis of the cancer.
Circulating tumor cell testing enables the detection and quantification of tumor cells in the blood of cancer patients. With the biomarker analysis, the circulating tumor cells testing helps in the characterization of tumor cells. Circulating tumor cells tests have application in investigation of various types of cancer such as breast cancer, prostate cancer and colon cancer.
The growing prevalence of cancer is one of the major reasons behind the growth of circulating tumor cell testing market. According to NIH, National Cancer Institute, cancer is one of the major reasons of death globally. In 2012, there were around 8.2 Mn cancer related death and 14.1 Mn new cases of cancer globally. By 2030 the number of new cases of cancer is expected to reach to more than 23 Mn.