Some tumour markers are specific to one type of cancer, while others are related The doctor will decide if further tests, procedures, follow-up care or additional. CEA markers can be used by your doctor to monitor the response to chemotherapy, as well as often being used in the follow-up period when treatment ends. A fact sheet that defines tumor markers and describes how they can be used to aid outweigh the harms of follow-up diagnostic tests and treatments for cancers. Tumor markers and specific cancers Different tumor markers may be used for different cancers. Views Read Edit View history. Please leave this field empty. Some are associated with only one type of cancer, whereas others are associated with two or more cancer types. How are tumor markers used in cancer care? These substances can be found in the blood, urine, stool, tumor tissue, or other tissues or bodily fluids of some patients with cancer.