tumor microenvironmentListen to pronunciation(TOO-mer MY-kroh-en-VY-run-ment)The normal cells, molecules, and blood vessels that surround and feed a tumor cell. A tumor can change its microenvironment, and the microenvironment can affect how a tumor grows and spreads.More InformationDefinition of: microenvironmentSearch NCI's Dictionary of Cancer TermsStarts withContainsBrowse:ABCDEFGHIJKLMNOPQRSTUVWXYZ#