NCIt definition : A term referring to the clinical or pathologic observation of a tumor extension from
its original site of growth to another anatomic site.;
Alternative definition : NCI-GLOSS: Having to do with metastasis, which is the spread of cancer from the primary
site (place where it started) to other places in the body.; CDISC: A term referring to the pathologic observation of a tumor extension or migration
from its original site of growth to another non-adjacent site.;