Plainly
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metastasis
nounmuh-TAS-tuh-sis
meaning in plain English
When cancer moves from where it started to another part of the body.
for example
The tests showed metastasis in other areas of the body.
Imagine a dandelion’s seeds flying from one yard to another—metastasis is like cancer’s seeds traveling through the body to start new growths somewhere else. Why does this happen? Because sometimes cancer cells break free and hitch a ride in the blood or other fluids to set up shop in a new place.