what is a tumour markers blood test
Your doctor may order blood tests for cancer/tumor markers to detect cancer activity in the body. Proteins and circulating tumor cells are two types of markers that can be measured. A cancer tumor often produces a specific protein in the blood that serves as a marker for the cancer.Circulating tumor cells are cells that break off from the cancer and move into the blood stream.roteins and circulating tumor cells are two types of markers that can be measured. A cancer tumor often produces a specific protein in the blood that serves as a marker for the cancer. Circulating tumor cells are cells that break off from the cancer and move into the blood stream.