FCO. Definition

Medical Definition: FCO

A substance that relieves pain and is being studied in the treatment of some cancers. The FCO is attached to the body's cells, including tumor cells that have receptors on the surface of the FCO. This could help prevent the growth of tumor cells. It may also prevent the formation of new blood vessels that tumors need to grow. An FCO is a type of biological response modifier and a type of antiangiogenesis. Also called opioid growth factor.

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