CTC (circulating tumor cell, circulating tumor cell) can not be clear meaning is usually mainly refers to a single circulating tumor cell test results are not enough to confirm the diagnosis of the disease, need to be combined with other tests common diagnosis. CTC often refers to circulating tumor cells, CTC examination can detect tumor cells shed into the peripheral blood circulation from the primary or metastatic foci of the tumor, and CTC can not have a clear significance usually because its results are not enough to confirm the diagnosis, and can not be diagnosed as inflammation and infection, cancerous lesions, or reactive changes, etc., but we can not rule out such a possibility completely. For the situation that CTC can’t make clear significance, clinic usually combines with other examinations to assist diagnosis, such as tissue biopsy pathology examination, etc., which should be carried out under the guidance of professional doctors.