Erythropoietin | Cancer Research UK

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Erythropoietin is a protein called a growth factor that encourages the bone marrow to make more red blood cells. It is also called EPO. It is made by the kidneys but can now be made in the laboratory in large amounts. Some people may have EPO injections if they get anaemic during chemotherapy and feel very tired and breathless.

Updated: 8 September 2009