Tumour or cancer markers are produced either by the tumour itself or by the body in response to the presence of cancer or certain non-cancerous benign conditions.
AFP is used in the follow-up management of patients undergoing cancer therapy. Calcitonin helps in the diagnosis and follow-up of medullary thyroid carcinoma and of MEN type II. CEA is used in the monitoring of colorectal cancer and selected other cancers. Free bhCG is an aid in the diagnosis of testicular tumors, ovarian germ cell tumors, and teratomas, mainly.
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